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June 2005 rev 0.2 3.3V/2.5V LVCMOS Clock Fanout Buffer
Features
Configurable 10 outputs LVCMOS Clock distribution buffer Compatible to single, dual and mixed 3.3V/2.5V Voltage supply Wide range output clock frequency up to 250MHz Designed for mid-range to high-performance telecom, networking and computer applications Supports high-performance differential clocking applications Max. output skew of 200pS (150pS within one bank) Selectable output configurations per output bank Tristatable outputs 32 LQFP and TQFP Packages Ambient Operating temperature range of -40 to 85C Pin and Function compatible to MPC9456
ASM2I99456
specified for the extended temperature range of -40 to 85C. The ASM2I99456 is a full static design supporting clock frequencies up to 250 MHz. The signals are generated and retimed on-chip to ensure minimal skew between the three output banks. Each of the three output banks can be individually supplied by 2.5V or 3.3V supporting mixed voltage applications. The FSELx pins choose between division of the input reference frequency by one or two. The frequency divider can be set individually for each of the three output banks. The ASM2I99456 can be reset and the outputs are disabled by deasserting the MR/OE pin (logic high state). Asserting MR/OE will enable the outputs. All control inputs accept LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated 50 transmission lines. The clock input is low voltage PECL compatible for differential clock distribution support. Please consult the ASM2I99446 specification for a full CMOS compatible device. For series terminated transmission lines, each of the ASM2I99456 outputs can drive one or two traces giving the devices an effective fanout of 1:20. The device is packaged in a 7x7 mm2 32-lead LQFP and TQFP Packages.
Functional Description
The ASM2I99456 is a 2.5V and 3.3V compatible 1:10 clock distribution buffer designed for low-Voltage mid-range to high-performance telecom, networking and computing applications. Both 3.3V, 2.5V and dual supply voltages are supported for mixed-voltage applications. The ASM2I99456 offers 10 low-skew outputs and a differential LVPECL clock input. The outputs are configurable and support 1:1 and 1:2 output to input frequency ratios. The ASM2I99456 is
Alliance Semiconductor 2575, Augustine Drive * Santa Clara, CA * Tel: 408.855.4900 * Fax: 408.855.4999 * www.alsc.com
Notice: The information in this document is subject to change without notice.
June 2005 rev 0.2
Block Diagram
Bank A PCLK PCLK VCC/2 25K Bank B 0 1 25K CLK CLK/ 2 0 1
ASM2I99456
QA0 QA1 QA2 QB0 QB1 QB2
FSELA 25K FSELB 25K FSELC MR/OE 0 1 25K 25K Bank C
QC0 QC1 QC2 QC3
ASM2I99456 Logic Diagram
Pin Configuration
VCCC VCCB VCCB GND GND QB0 QB1 QB2
VCCB is internally connected to VCC
24 VCCA QA2 GND QA1 VCCA QA0 GND MR/OE 25 26 27 28 29 30 31 32 1
23
22
21
20
19
18
17 16 15 14 QC3 GND QC2 VCCC QC1 GND QC0 VCCC
ASM2I99456
13 12 11 10 9
2
3
4
5
6
7
8
PECL_CLK
PCL_CLK
FSELB
FSELA
FSELC
3.3V/2.5V LVCMOS Clock Fanout Buffer
Notice: The information in this document is subject to change without notice.
GND
NC
VCC
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Table 1. Pin Configuration Pin Number
3 4 5,6,7 32 8,11,15,20,24,27,31 25,29 18,22 9,13, 17 2 30,28,26 23,21,19 10,12,14,16 1
ASM2I99456
Pin
PECL_CLK, PECL_CLK FSELA, FSELB, FSELC MR/OE GND VCCA, VCCB1, VCCC VCC QA0 - QA2 QB0 - QB2 QC0 - QC3 NC
I/O
Input Input Input
Type
LVPECL LVCMOS LVCMOS Supply Supply Supply
Function
Differential Clock reference Low Voltage positive ECL input Output bank divide select input Internal reset and output tristate control Negative Voltage supply output bank (GND) Positive Voltage supply for output banks Positive Voltage supply core (VCC) Bank A Outputs Bank B Outputs Bank C Outputs No Connect
Output Output Output -
LVCMOS LVCMOS LVCMOS -
Note:1 VCCB is internally connected to VCC.
Table 2. Supported Single and Dual Supply Configurations Supply voltage configuration
3.3V Mixed voltage supply 2.5V
VCC1
3.3V 3.3V 2.5V
VCCA2
3.3V 3.3V or 2.5V 2.5V
VCCB3
3.3V 3.3V 2.5V
VCCC4
3.3V 3.3V or 2.5V 2.5V
GND
0V 0V 0V
Note: 1 VCC is the positive power supply of the device core and input circuitry. VCC voltage defines the input threshold and levels 2 VCCA is the positive power supply of the bank A outputs. VCCA voltage defines bank A output levels 3 VCCB is the positive power supply of the bank B outputs. VCCB voltage defines bank B output levels. VCCB is internally connected to VCC. 4 VCCC is the positive power supply of the bank C outputs. VCCC voltage defines bank C output levels
Table 3. Function Table (Controls) Control
FSELA FSELB FSELC MR/OE
Default
0 0 0 0 fQA0:2 = fREF fQB0:2 = fREF fQC0:3 = fREF Outputs enabled
0
1
fQA0:2 = fREF /2 fQB0:2 = fREF /2 fQC0:3 = fREF /2 Internal reset Outputs disabled (tristate)
Table 4. Absolute Maximum Ratings1 Symbol
VCC VIN VOUT IIN IOUT TS Supply Voltage DC Input Voltage DC Output Voltage DC Input Current DC Output Current Storage temperature -40
Characteristics
Min
-0.3 -0.3 -0.3
Max
4.6 VCC+0.3 VCC+0.3 20 50 125
Unit
V V V mA mA C
Condition
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability.
3.3V/2.5V LVCMOS Clock Fanout Buffer
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Table 5. General Specifications Symbol
VTT MM HBM LU CPD CIN
ASM2I99456
Characteristics
Output Termination Voltage ESD Protection (Machine Model) ESD Protection (Human Body Model) Latch-Up Immunity Power Dissipation Capacitance Input Capacitance
Min
200 2000 200
Typ
VCC /2
Max
Unit
V V V mA
Condition
10 4.0
pF pF
Per output
Table 6. DC Characteristics (VCC = VCCA = VCCB = VCCC = 3.3V 5%, TA = -40 to +85C) Symbol
VIH VIL VPP VCMR1 IIN VOH VOL ZOUT ICCQ4
Characteristics
Input high voltage Input low voltage Peak-to-peak input voltage Common Mode Range Input current
2
Min
2.0 -0.3 PCLK PCLK 250 1.1
Typ
Max
VCC + 0.3 0.8 VCC-0.6 200
Unit
V V mV V A V V V mA
Condition
LVCMOS LVCMOS LVPECL LVPECL VIN=GND or VIN=VCC IOH=-24 mA3 IOL= 24mA2 IOL= 12mA All VCC Pins
Output High Voltage Output Low Voltage Output impedance Maximum Quiescent Supply Current
2.4 0.55 0.30 14 - 17 2.0
Note: 1 VCMR (DC) is the crosspoint of the differential input signal. Functional operation is obtained when the crosspoint is within the VCMR range and the input swing lies within the VPP (DC) specification. 2 Input pull-up / pull-down resistors influence input current. 3 The ASM2I99456 is capable of driving 50 transmission lines on the incident edge. Each output drives one 50 parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up to two 50 series terminated transmission lines. 4 ICCQ is the DC current consumption of the device with all outputs open and the input in its default state or open
3.3V/2.5V LVCMOS Clock Fanout Buffer
Notice: The information in this document is subject to change without notice.
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Table 7. AC Characteristics (VCC = VCCA = VCCB = VCCC = 3.3V 5%, TA = -40 to +85C)1 Symbol
fref fMAX VPP VCMR3 tP, REF tr, tf tPLH tPHL tPLZ, HZ tPZL, LZ tsk(O) tsk(PP) tSK(P) DCQ tr, tf
ASM2I99456
Characteristics
Input Frequency Maximum Output Frequency Peak-to-peak input voltage Common Mode Range Reference Input Pulse Width PCLK Input Rise/Fall Time Propagation delay Output Disable Time Output Enable Time Output-to-output Skew Within one bank Any output bank, same output divider Any output, Any output divider Device-to-device Skew Output pulse skew Output Duty Cycle Output Rise/Fall Time
5
Min
0 /1 output /2 output PCLK PCLK 0 0 500 1.3 1.4
Typ
Max
2502 2502 125 1000 VCC-0.8 1.04
Unit
MHz MHz MHz mV V nS nS nS nS nS nS pS pS pS nS pS % % nS
Condition
FSELx=0 FSELx=1 LVPECL LVPECL 0.8 to 2.0V
CCLK to any Q CCLK to any Q
2.2 2.2
2.8 2.8
4.45 4.2 10 10 150 200 350 2.25 200
/1 output /2 output
47 45 0.1
50 50
53 55 1.0
DCREF = 50% DCREF = 25%-75% 0.55 to 2.4V
Note: 1 AC characteristics apply for parallel output termination of 50 to VTT. 2 The ASM2I99456 is functional up to an input and output clock frequency of 350MHz and is characterized up to 250 MHz. 3 VCMR (AC) is the crosspoint of the differential input signal. Normal AC operation is obtained when the crosspoint is within the VCMR range and the input swing lies within the VPP (AC) specification. 4 Violation of the 1.0nS maximum input rise and fall time limit will affect the device propagation delay, device-to-device skew, reference input pulse width, output duty cycle and maximum frequency specifications. 5 Output pulse skew is the absolute difference of the propagation delay times: | tPLH - tPHL |.
Table 8. DC Characteristics (VCC = VCCA = VCCB = VCCC = 2.5V 5%, TA = -40 to +85C) Symbol
VIH VIL VPP VCMR1 VOH VOL ZOUT IIN ICCQ
4
Characteristics
Input high voltage Input low voltage Peak-to-peak Input voltage Common Mode Range Output High Voltage Output Low Voltage Output impedance Input current3 Maximum Quiescent Supply Current PCLK PCLK
Min
1.7 -0.3 250 1.1 1.8
Typ
Max
VCC + 0.3 0.7 VCC-0.7 0.6
Unit
V V mV V V V A mA
Condition
LVCMOS LVCMOS LVPECL LVPECL IOH=-24 mA 2 IOL= 15 mA VIN=GND or VIN=VCC All VCC Pins
17 - 20
2
200 2.0
Note:1 VCMR (DC) is the crosspoint of the differential input signal. Functional operation is obtained when the crosspoint is within the VCMR range and the input swing lies within the VPP (DC) specification. 2 The ASM2I99456 is capable of driving 50 transmission lines on the incident edge. Each output drives one 50 parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up to two 50 series terminated transmission lines. 3 Input pull-up / pull-down resistors influence input current. 4 ICCQ is the DC current consumption of the device with all outputs open and the input in its default state or open
3.3V/2.5V LVCMOS Clock Fanout Buffer
Notice: The information in this document is subject to change without notice.
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Table 9. AC Characteristics (VCC = VCCA = VCCB = VCCC = 2.5V 5%, TA = -40 to +85C)1
Symbol fref fMAX VPP VCMR
3
ASM2I99456
Characteristics Input Frequency Maximum Output Frequency Peak-to-peak input voltage Common Mode Range Reference Input Pulse Width PCLK Input Rise/Fall Time Propagation delay Output Disable Time Output Enable Time Output-to-output Skew Within one bank Any output bank, same output divider Any output, Any output divider Device-to-device Skew Output pulse skew Output Duty Cycle Output Rise/Fall Time
5
Min 0 /1 output /2 output PCLK PCLK 0 0 500 1.1 1.4
Typ
Max 2502 2502 125 1000 VCC-0.7 1.04
Unit MHz MHz MHz mV V nS nS nS nS nS nS pS pS pS nS pS % nS
Condition FSELx=0 FSELx=1 LVPECL LVPECL 0.7 to 1.7V
tP, REF tr, tf tPLH tPHL tPLZ, HZ tPZL, LZ tsk(O) tsk(PP) tSK(P) DCQ tr, tf
PCLK to any Q PCLK to any Q
2.6 2.6
5.6 5.5 10 10 150 200 350 3.0 200
/1 or /2 output
45 0.1
50
55 1.0
DCREF = 50% 0.6 to 1.8V
Note: 1 AC characteristics apply for parallel output termination of 50 to VTT. 2 The ASM2I99456 is functional up to an input and output clock frequency of 350MHz and is characterized up to 250 MHz. 3 VCMR (AC) is the crosspoint of the differential input signal. Normal AC operation is obtained when the crosspoint is within the VCMR range and the input swing lies within the VPP (AC) specification. 4 Violation of the 1.0nS maximum input rise and fall time limit will affect the device propagation delay, device-to-device skew, reference input pulse width, output duty cycle and maximum frequency specifications. 5 Output pulse skew is the absolute difference of the propagation delay times: | tPLH - tPHL |.
Table 10. AC Characteristics (VCC = 3.3V 5%, VCCA = VCCB = VCCC = 2.5V 5% or 3.3V 5%,TA = -40 to +85C),1,2
Symbol Characteristics Output-to-output Skew Within one bank Any output bank, same output divider Any output, Any output divider Device-to-device Skew Propagation delay 3 Output pulse skew Output Duty Cycle PCLK to any Q /1 or /2 output 45 Min Typ Max 150 250 350 2.5 See 3.3V table 250 50 55 pS % DCREF = 50% Unit pS pS pS nS Condition
tsk(O)
tsk(PP) tPLH,HL tSK(P) DCQ
Note: 1 AC characteristics apply for parallel output termination of 50 to VTT. 2 For all other AC specifications, refer to 2.5V or 3.3V tables according to the supply voltage of the output bank. 3 Output pulse skew is the absolute difference of the propagation delay times: | tPLH - tPHL |.
3.3V/2.5V LVCMOS Clock Fanout Buffer
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Applications Information Driving Transmission Lines
The ASM2I99456 clock driver was designed to drive high speed signals in a terminated transmission line environment. To provide the optimum flexibility to the user the output drivers were designed to exhibit the lowest impedance possible. With an output impedance of less than 20 the drivers can drive either parallel or series terminated transmission lines. In most high performance clock networks point-to-point distribution of signals is the method of choice. In a point-to-point scheme either series terminated or parallel terminated transmission lines can be used. The parallel technique terminates the signal at the end of the line with a 50 resistance to VCC/2. This technique draws a fairly high level of DC current and thus only a single terminated line can be driven by each output of the ASM2I99456 clock driver. For the series terminated case however there is no DC current draw, thus the outputs can drive multiple series terminated lines. Figure 1. "Single versus Dual Transmission Lines" illustrates an output driving a single series terminated line versus two series terminated lines in parallel. When taken to its extreme the fanout of the ASM2I99456 clock driver is effectively doubled due to its capability to drive multiple lines.
ASM2I99456 OUTPUT BUFFER 14 RS=36 Z0=50
ASM2I99456
parallel combination of the 36 series resistor plus the output impedance does not match the parallel combination of the line impedances. The voltage wave launched down the two lines will equal: VL = VS ( Z0 / (RS+R0 +Z0)) Z0 = 50 || 50 RS = 36 || 36 R0 = 14 VL = 3.0 ( 25 / (18+14+25) = 1.31V At the load end the voltage will double, due to the near unity reflection coefficient, to 2.5V. It will then increment towards the quiescent 3.0V in steps separated by one round trip delay (in this case 4.0nS).
3.0 2.5 VOLTAGE (V) 2.0 In 1.5 1.0 0.5 0 2 4 6 8 10 12 14 TIME (nS) OutA tD = 3.8956 OutB tD = 3.9386
ASM2I99456 OUTPUT BUFFER 14
RS=36
Z0=50
Figure 2. Single versus Dual Waveforms Since this step is well above the threshold region it will not cause any false clock triggering, however designers may be uncomfortable with unwanted reflections on the line. To better match the impedances when driving multiple lines the situation in Figure 3. "Optimized Dual Line Termination" should be used. In this case the series terminating resistors are reduced such that when the parallel combination is added to the output buffer impedance the line impedance is perfectly matched.
ASM2I99456 OUTPUT BUFFER 14 RS=22 RS=22 Z0=50
RS=36
Z0=50
Figure 1. Single versus Dual Transmission Lines The waveform plots in Figure 2. "Single versus Dual Line Termination Waveforms" show the simulation results of an output driving a single line versus two lines. In both cases the drive capability of the ASM2I99456 output buffer is more than sufficient to drive 50 transmission lines on the incident edge. Note from the delay measurements in the simulations a delta of only 43pS exists between the two differently loaded outputs. This suggests that the dual line driving need not be used exclusively to maintain the tight output-to-output skew of the ASM2I99456. The output waveform in Figure 2. "Single versus Dual Line Termination Waveforms" shows a step in the waveform, this step is caused by the impedance mismatch seen looking into the driver. The
Z0=50
14 + 22 || 22 = 50 || 50 25 = 25 Figure 3. Optimized Dual Line Termination
3.3V/2.5V LVCMOS Clock Fanout Buffer
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ASM2I99456 DUT
Differential Pulse Generator Z=50 Z0=50 Z0=50
ASM2I99456
RT=50 RT=50 VTT VCC - 2V
Figure 4. PCLK ASM2I99456 AC Test Reference for VCC = 3.3V and VCC = 2.5V
PCLK VCC = 3.3V VCC = 2.5V 2.4 0.55 tF tR QX tP(LH) tP(HL) 1.8V 0.6V PCLK VPP
VCMR
VCC VCC /2 GND
Figure 5. Output Transition Time Test Reference
Figure 6. Propagation Delay (tPD) Test Reference
VCC VCC /2 GND tP T0 DC (tP /T0 100%)
VCC VCC /2 GND VOH VCC /2 tSK(LH) tSK(HL) GND
The time from the output controlled edge to the non-controlled edge, divided by the time output controlled edge, expressed as a percentage.
The pin-to-pin skew is defined as the worst case difference in propagation delay between any similar delay path within a single device
Figure 8. Output-to- Output Skew tSK(O)
Figure 7. Output Duty Cycle (DC)
VCC = 3.3V VCC = 2.5V 2.4 0.55 tF tR 1.8V 0.6V
Figure 9. Output Transition Time Test Reference
3.3V/2.5V LVCMOS Clock Fanout Buffer
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Power Consumption of the ASM2I99456 and Thermal Management
The ASM2I99456 AC specification is guaranteed for the entire operating frequency range up to 250MHz. The ASM2I99456 power consumption and the associated long-term reliability may decrease the maximum frequency limit, depending on operating conditions such as clock frequency, supply voltage, output loading, ambient temperature, vertical convection and thermal conductivity of package and board. This section describes the impact of these parameters on the junction temperature and gives a guideline to estimate the ASM2I99456 die junction temperature and the associated device reliability.
ASM2I99456
Where ICCQ is the static current consumption of the ASM2I99456, CPD is the power dissipation capacitance per output, ()CL represents the external capacitive output load, N is the number of active outputs (N is always 12 in case of the ASM2I99456). The ASM2I99456 supports driving transmission lines to maintain high signal integrity and tight timing parameters. Any transmission line will hide the lumped capacitive load at the end of the board trace, therefore, CL is zero for controlled transmission line systems and can be eliminated from equation 1. Using parallel termination output termination results in equation 2 for power dissipation. In equation 2, P stands for the number of outputs with a parallel or thevenin termination, VOL, IOL, VOH and IOH are a function of the output termination technique and DCQ is the clock signal duty cycle. If transmission lines are used CL is zero in equation 2 and can be eliminated. In general, the use of controlled transmission line techniques eliminates the impact of the lumped capacitive loads at the end lines and greatly reduces the power dissipation of the device. Equation 3 describes the die junction temperature TJ as a function of the power consumption. Where Rthja is the thermal impedance of the package (junction to ambient) and TA is the ambient temperature. According to Table 11, the junction temperature can be used to estimate the long-term device reliability. Further, combining equation 1 and equation 2 results in a maximum operating frequency for the ASM2I99456 in a series terminated transmission line system, equation 4.
Table 11. Die junction temperature and MTBF
Junction temperature (C) 100 110 MTBF (Years) 20.4 9.1
120 4.2 130 2.0 Increased power consumption will increase the die junction temperature and impact the device reliability (MTBF). According to the system-defined tolerable MTBF, the die junction temperature of the ASM2I99456 needs to be controlled and the thermal impedance of the board/package should be optimized. The power dissipated in the ASM2I99456 is represented in equation 1.
3.3V/2.5V LVCMOS Clock Fanout Buffer
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TJ,MAX should be selected according to the MTBF system requirements and Table 11. Rthja can be derived from Table 12. The Rthja represent data based on 1S2P boards, using 2S2P boards will result in a lower thermal impedance than indicated below.
ASM2I99456
If the calculated maximum frequency is below 350 MHz, it becomes the upper clock speed limit for the given application conditions. The following eight derating charts describe the safe frequency operation range for the ASM2I99456. The charts were calculated for a maximum tolerable die junction temperature of 110C (120C), corresponding to an estimated MTBF of 9.1 years (4 years), a supply voltage of 3.3V and series terminated transmission line or capacitive loading. Depending on a given set of these operating conditions and the available device convection a decision on the maximum operating frequency can be made.
Table 12. Thermal package impedance of the 32LQFP
Convection, LFPM Still air 100 lfpm 200 lfpm 300 lfpm 400 lfpm 500 lfpm Rthja (1P2S board), C/W 86 76 71 68 66 60 Rthja (2P2S board), C/W 61 56 54 53 52 49
3.3V/2.5V LVCMOS Clock Fanout Buffer
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Package Information 32-lead LQFP Package
ASM2I99456
SECTION A-A
Dimensions Symbol
A A1 A2 D D1 E E1 L L1 T T1 b b1 R0 e a
Inches Min Max
.... 0.0020 0.0531 0.3465 0.2717 0.3465 0.2717 0.0177 0.0035 0.0038 0.0118 0.0118 0.0031 0 0.0630 0.0059 0.0571 0.3622 0.2795 0.3622 0.2795 0.0295 0.0079 0.0062 0.0177 0.0157 0.0079 7
Millimeters Min Max
... 0.05 1.35 8.8 6.9 8.8 6.9 0.45 0.09 0.097 0.30 0.30 0.08 0 1.6 0.15 1.45 9.2 7.1 9.2 7.1 0.75 0.2 0.157 0.45 0.40 0.20 7
0.03937 REF
1.00 REF
0.031 BASE
0.8 BASE
3.3V/2.5V LVCMOS Clock Fanout Buffer
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32-lead TQFP Package
ASM2I99456
SECTION A-A
Dimensions Symbol
A A1 A2 D D1 E E1 L L1 T T1 b b1 R0 a e
Inches Min Max
.... 0.0020 0.0374 0.3465 0.2717 0.3465 0.2717 0.0177 0.0035 0.0038 0.0118 0.0118 0.0031 0 0.0472 0.0059 0.0413 0.3622 0.2795 0.3622 0.2795 0.0295 0.0079 0.0062 0.0177 0.0157 0.0079 7
Millimeters Min Max
... 0.05 0.95 8.8 6.9 8.8 6.9 0.45 0.09 0.097 0.30 0.30 0.08 0 0.8 BASE 1.2 0.15 1.05 9.2 7.1 9.2 7.1 0.75 0.2 0.157 0.45 0.40 0.2 7
0.03937 REF
1.00 REF
0.031 BASE
3.3V/2.5V LVCMOS Clock Fanout Buffer
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Ordering Information
Part Number ASM2I99456-32-LT ASM2I99456-32-LR ASM2I99456G-32-LT ASM2I99456G-32-LR ASM2I99456-32-ET ASM2I99456-32-ER ASM2I99456G-32-ET ASM2I99456G-32-ER Marking ASM2I99456L ASM2I99456L ASM2I99456GL ASM2I99456GL ASM2I99456E ASM2I99456E ASM2I99456GE ASM2I99456GE Package Type 32-pin LQFP, Tray 32-pin LQFP -Tape and Reel 32-pin LQFP, Tray, Green 32-pin LQFP -Tape and Reel, Green 32-pin TQFP, Tray 32-pin TQFP -Tape and Reel 32-pin TQFP, Tray, Green 32-pin TQFP -Tape and Reel, Green
ASM2I99456
Operating Range Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial
Device Ordering Information
ASM2I99456G-32-LR
R = Tape & reel, T = Tube or Tray O = SOT S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN DEVICE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE PART NUMBER X= Automotive I= Industrial P or n/c = Commercial (-40C to +125C) (-40C to +85C) (0C to +70C) 1 = Reserved 2 = Non PLL based 3 = EMI Reduction 4 = DDR support products 5 = STD Zero Delay Buffer 6 = Power Management 7 = Power Management 8 = Power Management 9 = Hi Performance 0 = Reserved U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70
ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
3.3V/2.5V LVCMOS Clock Fanout Buffer
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ASM2I99456
Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com
Copyright (c) Alliance Semiconductor All Rights Reserved Part Number: ASM2I99456 Document Version: 0.2
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003
(c) Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
3.3V/2.5V LVCMOS Clock Fanout Buffer
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