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19-0157; Rev 1; 1/94
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators
_______________General Description
The MAX913 single and MAX912 dual high-speed, low-power comparators have differential inputs and complementary TTL outputs. Fast propagation delay (10ns typ), extremely low supply current, and a wide common-mode input range that includes the negative rail make the MAX912/MAX913 ideal for low-power, high-speed, single +5V (or 5V) applications such as V/F converters or switching regulators. The MAX912/MAX913 outputs remain stable through the linear region. This feature eliminates output instability common to high-speed comparators when driven with a slow-moving input signal. The MAX912/MAX913 can be powered from a single +5V supply or a 5V split supply. The MAX913 is an improved plug-in replacement for the LT1016. It provides significantly wider input voltage range and equivalent speed at a fraction of the power. The MAX912 dual comparator has equal performance to the MAX913 and includes independent latch controls.
____________________________Features
o Ultra Fast (10ns) o Single +5V or Dual 5V Supply Operation o Input Range Extends Below Negative Supply o Low Power: 6mA (+5V) Per Comparator o No Minimum Input Signal Slew-Rate Requirement o No Power-Supply Current Spiking o Stable in the Linear Region o Inputs Can Exceed Either Supply o Low Offset Voltage: 0.8mV
MAX912/MAX913
______________Ordering Information
PART MAX912CPE MAX912CSE MAX912C/D MAX912EPE MAX912ESE MAX912MJE MAX913CPA MAX913CSA MAX913C/D MAX913EPA MAX913ESA MAX913MJA TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO Dice* 16 Plastic DIP 16 Narrow SO 16 CERDIP 8 Plastic DIP 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP
________________________Applications
Zero-Crossing Detectors Ethernet Line Receivers Switching Regulators High-Speed Sampling Circuits High-Speed Triggers Extended Range V/F Converters Fast Pulse Width/Height Discriminators
* Dice are specified at TA = +25C, DC parameters only.
___________________________________________________________Pin Configurations
TOP VIEW
QA QA GND V+ IN+ INV1 2 3 4 8 Q Q GND LE LEA N.C. VINAINA+ 1 16 QB
MAX912
2 3 4 15 QB 14 GND 13 LEB
+ MAX913
7 6 5
-
6 7 8
DIP/SO
DIP/Narrow SO
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
-
5
+
A
B
12 N.C. 11 V+ 10 INB9 INB+
+
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators MAX912/MAX913
ABSOLUTE MAXIMUM RATINGS
Positive Supply Voltage............................................................7V Negative Supply Voltage ........................................................-7V Differential Input Voltage .....................................................15V Input Voltage (Referred to V-)..................................- 0.3V to 15V Latch Pin Voltage .............................................Equal to Supplies Continuous Output Current...............................................20mA Continuous Power Dissipation (TA = +70C) 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ...727mW 8-Pin SO (derate 5.88mW/C above +70C)................471mW 8-Pin CERDIP (derate 8.00mW/C above +70C)........640mW 16-Pin Plastic DIP (derate 10.53mW/C above +70C)...842mW 16-Pin Narrow SO (derate 8.70mW/C above +70C) ...696mW 16-Pin CERDIP (derate 10.00mW/C above +70C)....800mW Operating Temperature Ranges: MAX91_ C_ _ ......................................................0C to +70C MAX91_ E_ _....................................................-40C to +85C MAX91_ MJ_ .................................................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = +5V, V- = -5V, VQ = 1.4V, VLE = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Offset Voltage (Note 1) Offset Drift Input Offset Current (Note 1) SYMBOL VOS TCVOS IOS TA = +25C TA = TMIN to TMAX TA = +25C Input Bias Current IB C, E temp. ranges M temp. range C, E temp. ranges Input Voltage Range VCM M temp. range Single +5V Common-Mode Rejection Ratio Power-Supply Rejection Ratio Small-Signal Voltage Gain CMRR PSRR AV VOH Output Voltage VOL Positive Supply Current Per Comparator Negative Supply Current Per Comparator Latch-Pin High Input Voltage Latch-Pin Low Input Voltage Latch-Pin Current I+ IVIH VIL IIL VLE = 0V 2.0 0.8 -20 -5.0V VCM +3.5V Positive supply: 4.5V V+ 5.5V Negative supply: -2V V- -7V 1V VQ 2V, TA = +25C V+ 4.5V ISINK = 4mA TA = +25C, ISINK = 10mA C, E temp. ranges M temp. range 0.4 IOUT = 1mA IOUT = 10mA C, E temp. ranges M temp. range -5.2 -5.0 -0.2 0 80 60 80 1500 2.7 2.4 110 85 100 3500 3.4 3.0 0.3 0.4 6 10 12 2 mA mA V V A 0.5 V 3 RS 100 CONDITIONS TA = +25C TA = TMIN to TMAX 2 0.3 0.5 0.8 5 8 10 +3.5 +3.5 +3.5 +3.5 dB dB V/V V A MIN TYP 0.8 MAX 2 3 UNITS mV V/C A
2
_______________________________________________________________________________________
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators MAX912/MAX913
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +5V, V- = -5V, VQ = 1.4V, VLE = 0V, TA = TMIN to TMAX, unless otherwise noted). PARAMETER SYMBOL CONDITIONS VIN = 100mV, VOD = 5mV VIN = 100mV, VOD = 20mV VIN = 100mV, VOD = 5mV VIN = 100mV, VOD = 5mV (MAX912 only) tSU tH tLPD TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C MAX913 MAX912 2 3 500 2 3 0 2 7 9 MIN TYP 10 MAX 14 16 12 15 3 5 ns ns UNITS
Propagation Delay (Note 2)
tPD+, tPD-
Differential Propagation Delay (Note 2) Channel-to-Channel Propagation Delay (Note 2) Latch Setup Time (Note 3) Latch Hold Time (Note 3) Latch Propagation Delay (Note 4)
tPD
TA = +25C
ps ns ns ns
Note 1: Input Offset Voltage (VOS) is defined as the average of the two input offset voltages, measured by forcing first one output, then the other to 1.4V. Input Offset Current (IOS) is defined the same way. Note 2: Propagation Delay (tPD) and Differential Propagation Delay (tPD) cannot be measured in automatic handling equipment with low input overdrive values. The MAX912/MAX913 are sample tested to 0.1% AQL with a 1V step and 500mV overdrive at +25C only. Correlation tests show that tPD and tPD can be guaranteed with this test, if additional DC tests are performed to guarantee that all internal bias conditions are correct. For low overdrive conditions, VOS is added to the overdrive. Differential Propagation Delay is defined as: tPD = tPD+ - tPD-. Note 3: Input latch setup time (tSU) is the interval in which the input signal must be stable prior to asserting the latch signal. The hold time (tH) is the interval after the latch is asserted in which the input signal must be stable. These parameters are guaranteed by design. Note 4: Latch Propagation Delay (tLPD) is the delay time for the output to respond when the latch-enable pin is deasserted. See Timing Diagram.
__________________________________________Typical Operating Characteristics
(V+ = 5V, V- = -5V, VLE = 0V, CL = 15pF, TA = +25C, unless otherwise noted.)
PROPAGATION DELAY vs. INPUT OVERDRIVE
MAX912-01
PROPAGATION DELAY vs. SOURCE RESISTANCE
MAX912-02
PROPAGATION DELAY vs. LOAD CAPACITANCE
VOD = 10mV 10 PROPAGATION DELAY (ns) tPD(-)
MAX912-03
10 VOD = 10mV PROPAGATION DELAY (ns) 9
50 VOD = 10mV PROPAGATION DEALY (ns) 40
11
tPD(-)
8
30
9
7
tPD(+)
20
tPD(-)
8 tPD(+) 7
6 5 1 10 INPUT OVERDRIVE (mV) 100
10 0 1 10 100 1000
tPD(+)
6 10,000 10 SOURCE RESISTANCE () 20 30 40 LOAD CAPACITANCE (pF) 50
_______________________________________________________________________________________
3
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators MAX912/MAX913
____________________________Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, VLE = 0V, CL = 15pF, TA = +25C, unless otherwise noted.)
POSITIVE SUPPLY CURRENT (PER COMPARATOR) vs. POSTIVE SUPPLY VOLTAGE
MAX912-07 MAX912-04
PROPAGATION DELAY vs. TEMPERATURE
11 VOD = 10mV 10 PROPAGATION DELAY (ns) Q OUTPUT tPD(-) Q OUTPUT tPD(-) 10
NEGATIVE SUPPLY CURRENT (PER COMPARATOR) vs. NEGATIVE SUPPLY VOLTAGE
MAX912-08
V- = 0V TO -5V
1.2 1.0
I+ (PER COMPARATOR)
9
TA = +25C 6
I- (PER COMPARATOR)
8
TA = +125C
0.8 0.6
TA = +125C
8
Q OUTPUT tPD(+) Q OUTPUT tPD(+)
TA = +25C
7
4
TA = -55C
0.4 TA = -55C 0.2 3 4 5 V+ (V) 6 7 0 1 2 3 4 V- (V) 5 6 7
6 -55 -15 25 65 TEMPERATURE (C) 105 125
2
OFFSET VOLTAGE vs. TEMPERATURE
MAX912-11
INPUT BIAS CURRENT vs. TEMPERATURE
MA912-12
OUTPUT VOLTAGE vs. DIFFERENTIAL INPUT VOLTAGE
MAX912-14
1000
6
5 TA = +125C 4 OUTPUT VOLTAGE (V) TA = +25C
800 5 VOS (V) 600 IB (A) 4
VCM = -5.2V
VCM = 0V
3 TA = -55C
400 3 VCM = +3.5V 2 -55 -15 25 65 TEMPERATURE (C) 105 125 -55 -15 25 65 TEMPERATURE (C) 105 125
2
200
1 0 -3 -2 -1 0 1 2 DIFFERENTIAL INPUT VOLTAGE (mV) 3
0
4
_______________________________________________________________________________________
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators
____________________________Typical Operating Characteristics (continued)
(V+ = 5V, V- = -5V, VLE = 0V, CL = 15pF, TA = +25C, unless otherwise noted.) POSITIVE-TO-NEGATIVE PROPAGATION DELAY
INPUT 100mV/div
MAX912/MAX913
NEGATIVE-TO-POSITIVE PROPAGATION DELAY
INPUT 100mV/div
OUTPUT Q 1V/div
OUTPUT Q 1V/div
Q 5ns/div 5ns/div
Q
MAX912/MAX913 RESPONSE TO 50MHz (+10mVP-P) SINE WAVE
INPUT 10mV/div
OUTPUT Q 2V/div
10ns/div
MAX912/MAX913 RESPONSE TO SLOW-MOVING TRIANGLE WAVE MAX912/MAX913 RESPONSE
INPUT 20mV/div OUTPUT Q 1V/div Q 1V/div
INDUSTRY STANDARD 686 RESPONSE
INPUT 20mV/div OUTPUT Q 1V/div Q 1V/div
20s/div
20s/div
_______________________________________________________________________________________
5
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators MAX912/MAX913
____________________________________________________________Pin Descriptions
PIN MAX912 1 2 3, 14 4 5, 12 6 7 8 9 10 11 13 15 16 NAME QA -- QA GND LEA N.C. VINAINA+ INB+ INBV+ LEB -- QB QB Comparator A TTL output Comparator A complementary TTL output Logic ground. Connect both GND pins to ground. -- Comparator A latch enable. QA and Q A are latched when LEA is high or floating. Comparator A latch is transparent when LEA is low. Not internally connected Negative power supply: -5V for dual supplies (bypass to GND with a 0.1F capacitor), or GND for a single supply Comparator A inverting input Comparator A noninverting input Comparator B noninverting input Comparator B inverting input Positive power supply, +5V. Bypass to GND with a 0.1F capacitor. -- Comparator B latch enable. QB and Q B are latched when LEB is high or floating. Comparator B latch is transparent when LEB is low. Comparator B complementary TTL output Comparator B TTL output FUNCTION
PIN MAX913 1 2 3 4 5 6 7 8
NAME V+ IN+ INVLE GND Q -- Q
FUNCTION Positive power supply. Bypass to GND with a 0.1F capacitor. Noninverting input Inverting input Negative power supply: -5V for dual supplies (bypass to GND with a 0.1F capacitor), or GND for a single supply -- Latch enable. Q and Q are latched when LE is TTL high or floating. The comparator latch is transparent when LE is low. Logic ground TTL output Complementary TTL output
6
_______________________________________________________________________________________
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators
_______________Detailed Description
The MAX913 (single) and MAX912 (dual) high-speed comparators have a unique design that prevents oscillation when the comparator is in its linear region. No minimum input slew rate is required. Many high-speed comparators oscillate in the linear region, as shown in the Typical Operating Characteristics' industry-standard 686 response graph. One way to overcome this oscillation is to sample the output after it has passed through the unstable region. Another practical solution is to add hysteresis. Either solution results in a loss of resolution and bandwidth. Because the MAX912/MAX913 do not need hysteresis, they offer high resolution to all signals--including lowfrequency signals. The MAX912/MAX913 provide a TTL-compatible latch function that holds the comparator output state (Figure 1). As long as Latch Enable (LE) is high or floating, the input signal has no effect on the output state. With LE low, the outputs are controlled by the input differential voltage and the latch is transparent.
Resolution
A comparator's ability to resolve small signal differences--its resolution--is affected by various factors. As with most amplifiers, the most significant factors are the input offset voltage (VOS) and the common-mode and power-supply rejection ratios (CMRR, PSRR). If source impedance is high, input offset current can be significant. If source impedance is unbalanced, the input bias current can introduce another error. For high-speed comparators, an additional factor in resolution is the comparator's stability in its linear region. Many high-speed comparators are useless in their linear region because they oscillate. This makes the differential input voltage region around 0V unusable, as does a high VOS. Hysteresis does not cure the problem, but acts to keep the input away from its linear range (Figure 2). The MAX912/MAX913 do not oscillate in the linear region, which greatly enhances the comparator's resolution.
MAX912/MAX913
__________Applications Information
Power Supplies and Bypassing
The MAX912/MAX913 are tested with 5V power supplies that provide an input common-mode range (VCM) of 8.7V (-5.2V to +3.5V). Operation from a single +5V supply provides a common-mode input range of 3.7V (-0.2V to +3.5V). Connect V- to GND for single-supply operation. The MAX912/MAX913 will operate from a minimum single-supply voltage of +4.5V. The V+ supply provides power to both the analog input stage and digital output circuits, whereas the V- supply only powers the analog section. Bypass V+ and V- to ground with 0.1F to 1.0F ceramic capacitors in parallel with 10F or greater tantalum capacitors. Connect the ceramic capacitors very close to the MAX912/MAX913's
Input Amplifier
A comparator can be thought of as having two sections: an input amplifier and a logic interface. The MAX912/MAX913's input amplifier is fully differential, with input offset voltage trimmed to below 2.0mV at +25C. Input common-mode range extends from 200mV below the negative supply rail to 1.5V below the positive power supply. The total common-mode range is 8.7V when operating from 5VDC supplies. The MAX912/MAX913's amplifier has no built-in hysteresis. For highest accuracy, do not add hysteresis. Figure 2 shows how hysteresis degrades resolution.
tSU VIN (DIFFERENTIAL) tH LATCH ENABLE (LE) tPD+ Q tPD Q tPDtLPDR
Figure 1. Timing Diagram
_______________________________________________________________________________________ 7
Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparators MAX912/MAX913
supply pins, keeping leads short to minimize lead inductance. For particularly noisy applications, use ferrite beads on the power-supply lines.
Input Slew Rate
The MAX912/MAX913 design eliminates the input slewrate requirement imposed on many standard comparators. As long as LE is high after the maximum propagation delay and the input is greater than the comparator's total DC error, the output will be valid without oscillations.
Board Layout
As with all high-speed components, careful attention to layout is essential for best performance. 1) Use a printed circuit board with an unbroken ground plane. 2) Pay close attention to the bandwidth of bypass components and keep leads short. 3) Avoid sockets; solder the comparator and other components directly to the board to minimize unwanted parasitic inductance and capacitance.
IN+
Maximum Clock (LE) and Signal Rate
The maximum clock and signal rate is 70MHz, based on the comparator's rise and fall time with a 5mV overdrive at +25C (Figure 1). With a 20mV overdrive, the maximum propagation delay is 12ns and the clock and signal rate is 85MHz.
IN-
HYSTERESIS BAND*
Q
. . . . . . ..
. . . . . .
WITH HYSTERESIS IDEAL (WITHOUT HYSTERESIS) * WHEN HYSTERESIS IS ADDED, A COMPARATOR CANNOT RESOLVE ANY INPUT SIGNAL WITHIN THE HYSTERESIS BAND.
Figure 2. Effect of Hysteresis on Input Resolution
__________________________________________________________Chip Topographies
MAX912
INB+ INAINBINA+ IN-
MAX913
IN+ V+
V+ LEB GND QB QB QA QA 0.080" (2.03mm)
VLEA GND
V0.071" (1.80mm) LE GND Q V+ 0.056" (1.42mm)
Q
0.058" (1.47mm)
TRANSISTOR COUNT: 197; SUBSTRATE CONNECTED TO V-.
TRANSISTOR COUNT: 100; SUBSTRATE CONNECTED TO V-.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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