19-0157; Rev 2; 8/03
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
Features
♦ Ultra Fast (10ns)
♦ Single +5V or Dual ±5V Supply Operation
♦ Input Range Extends Below Negative Supply
♦ Low Power: 6mA (+5V) Per Comparator
♦ No Minimum Input Signal Slew-Rate Requirement
♦ No Power-Supply Current Spiking
♦ Stable in the Linear Region
♦ Inputs Can Exceed Either Supply
♦ Low Offset Voltage: 0.8mV
♦ Now Available in a Small µMAX Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
0°C to +70°C
16 Plastic DIP
MAX912CSE
0°C to +70°C
16 Narrow SO
MAX912EPE
-40°C to +85°C
16 Plastic DIP
Ethernet Line Receivers
MAX912ESE
-40°C to +85°C
16 Narrow SO
Switching Regulators
MAX913CPA
0°C to +70°C
High-Speed Sampling Circuits
MAX913CSA
0°C to +70°C
High-Speed Triggers
MAX913EPA
-40°C to +85°C
8 Plastic DIP
Extended Range V/F Converters
MAX913ESA
-40°C to +85°C
8 SO
Fast Pulse Width/Height Discriminators
MAX913EUA
-40°C to +85°C
8 µMAX
Applications
Zero-Crossing Detectors
MAX912CPE
8 Plastic DIP
8 SO
Pin Configurations
TOP VIEW
MAX912
MAX913
V+
1
8
Q
IN+
2
7
Q
3
6
GND
V- 4
5
LE
IN-
DIP/SO/µMAX
QA 1
16 QB
QA 2
15 QB
14 GND
GND 3
LEA 4
N.C. 5
V- 6
13 LEB
A
B
12 N.C.
11 V+
INA- 7
10 INB-
INA+ 8
9
INB+
DIP/NARROW SO
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX912/MAX913
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.
MAX912/MAX913
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
ABSOLUTE MAXIMUM RATINGS
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)842mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) .696mW
Operating Temperature Ranges:
MAX91_C_ _ ...........................................................0°C to +70°C
MAX91_E_ _.........................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Positive Supply Voltage .........................................................+7V
Negative Supply Voltage ........................................................-7V
V+ to V- ................................................................................+13V
Differential Input Voltage .....................................................+15V
Input Voltage (Referred to V-) ................................-0.3V to +14V
Latch Pin Voltage .............................................Equal to Supplies
Continuous Output Current...............................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW
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 = +25°C.) (Note 1)
PARAMETER
Input Offset Voltage (Note 2)
Offset Drift
Input Offset Current (Note 2)
Input Bias Current
Input Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Small-Signal Voltage Gain
SYMBOL
VOS
RS ≤ 100Ω
MIN
TA = +25°C
IOS
IB
VCM
CMRR
PSRR
AV
VOH
VOL
Positive Supply Current Per
Comparator (Note 3)
I+
Negative Supply Current Per
Comparator (Note 3)
I-
Latch-Pin High Input Voltage
VIH
Latch-Pin Low Input Voltage
VIL
Latch-Pin Current
IIL
TYP
MAX
0.1
2
TA = TMIN TO TMAX
3
TCVOS
Output Voltage
2
CONDITIONS
2
TA = +25°C
0.3
TA = TMIN TO TMAX
2
C, E temperature ranges
5
8
C, E temperature ranges
-5.2
+3.5
Single +5V
-0.2
+3.5
C, E temperature ranges
-5.0V ≤ VCM ≤ +3.5V
80
110
Positive supply; 4.5V ≤ V+ ≤ 5.5V
60
85
Negative supply; -2V ≥ V- ≥ -7V
80
100
1V ≤ VQ ≤ 2V, TA = +25°C
V+ ≥ 4.5V
1500
3500
IOUT = 1mA
2.7
3.4
IOUT = 10mA
2.4
3.0
ISINK = 4mA
0.3
TA = +25°C, ISINK = 10mA
0.4
C, E temperature ranges
µA
µA
V
dB
dB
V/V
0.5
V
6
10
mA
1
2
mA
2.0
VLE = 0V
mV
µV/°C
0.5
1
TA = +25°C
UNITS
V
-1
_______________________________________________________________________________________
0.8
V
-20
µA
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
V+ = +5V, V- = -5V, VQ = 1.4V, VLE = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Propagation Delay (Note 4)
Differential Propagation Delay
(Note 4)
SYMBOL
tPD+, tPD-
∆tPD
Channel-to-Channel Propagation
Delay (Note 4)
Latch Setup Time (Note 5)
Latch Hold Time (Note 5)
Latch Propagation Delay (Note 6)
CONDITIONS
∆VIN = 100mV,
VOD = 5mV
TA = +25°C
∆VIN = 100mV,
VOD = 20mV
TA = +25°C
MIN
TYP
MAX
10
14
9
12
TA = TMIN TO TMAX
16
TA = TMIN TO TMAX
∆VIN = 100mV,
VOD = 5mV
TA = +25°C
∆VIN = 100mV,
VOD = 5mV
(MAX912 only)
TA = +25°C
ns
15
MAX913
2
4
MAX912
3
5
tSU
2
tH
5
tLPD
UNITS
ns
500
ps
0
ns
2
ns
7
ns
Note 1: All specifications are 100% tested at TA = +25°C, unless otherwise noted. Specification limits over temperature (TA = TMIN
to TMAX) are guaranteed by design.
Note 2: 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 3: Supply currents are measured with VQ driven to both VOH and VOL (not 1.4V).
Note 4: Propagation Delay (tPD) and Differential Propagation Delay (∆tPD) cannot be measured in automatic handling equipment
with low input overdrive values. Characterization and correlation tests have shown that tPD and ∆tPD limits can be guaranteed by design. Electrical Characteristic DC tests are performed to guarantee that all internal bias conditions are correct.
For low overdrive conditions, VOS is added to overdrive. Differential Propagation Delay is defined as ∆tPD = tPD+ - tPD-.
Note 5: 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 6: Latch Propagation Delay (tLPD) is the delay time for the output to respond when the latch-enable pin is deasserted (see
Timing Diagram).
_______________________________________________________________________________________
3
MAX912/MAX913
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(V+ = +5V, V- = -5V, VLE = 0V, CL = 15pF, TA = +25°C, unless otherwise noted.)
8
tPD+
tPD-
18
16
14
12
10
tPD+
8
6
tPD-
14
VOD = 10mV
12
10
PROPAGATION DELAY
vs. TEMPERATURE
Q OUTPUT
tPD-
7
1.4
1.2
5
TA = +25°C
TA = -40°C
20
40
TEMPERATURE (°C)
60
0.2
3
80
4
OFFSET VOLTAGE
vs. TEMPERATURE
400
300
200
-20
0
20
40
TEMPERATURE (°C)
60
80
2
3
4
5
6
V- (V)
INPUT BIAS CURRENT
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. DIFFERENTIAL INPUT VOLTAGE
2.0
VCM = -5.2V
1.5
1.0
VCM = 0V
VCM = 3.5V
7
5
4
3
2
1
0
0
1
V+ (V)
2.5
0.5
100
0
7
6
MAX912/13 toc08
500
5
3.0
INPUT BIAS CURRENT (µA)
MAX912/13 toc07
600
-40
TA = -40°C
0.4
OUTPUT VOLTAGE (V)
0
0.8
1
0
-20
TA = +25°C
0.6
2
-40
50
TA = +85°C
1.0
6
3
Q OUTPUT
tPD+
40
NEGATIVE SUPPLY CURRENT
(PER COMPARATOR)
vs. NEGATIVE SUPPLY VOLTAGE
TA = +85°C
4
30
POSITIVE SUPPLY CURRENT
(PER COMPARATOR)
vs. POSITIVE SUPPLY VOLTAGE
I- (mA)
8
20
10
LOAD CAPACITANCE (pF)
8
I+ (mA)
PROPAGATION DELAY (ns)
Q OUTPUT
tPD+
10k
SOURCE RESISTANCE (Ω)
7
Q OUTPUT
tPD-
1k
V- = 0 TO 5V
9
5
4
100
10
MAX912/13 toc04
11
6
4
MAX912/13 toc06
INPUT OVERDRIVE (mV)
9
tPD+
6
0
1
100
MAX912/13 toc05
10
10
8
2
0
5
VOD = 5mV
tPD-
10
4
2
1
MAX912/13 toc03
VOD = 10mV
MAX912/13 toc09
6
MAX912/13 toc02
9
20
PROPAGATION DELAY (ns)
MAX912/13 toc01
PROPAGATION DELAY (ns)
10
7
PROPAGATION DELAY
vs. LOAD CAPACITANCE
PROPAGATION DELAY
vs. SOURCE RESISTANCE
PROPAGATION DELAY (ns)
PROPAGATION DELAY
vs. INPUT OVERDRIVE
OFFSET VOLTAGE (µV)
MAX912/MAX913
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
0
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
-3
-2
-1
0
1
2
DIFFERENTIAL INPUT VOLTAGE (mV)
_______________________________________________________________________________________
3
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
POSITIVE-TO-NEGATIVE PROPAGATION DELAY
NEGATIVE-TO-POSITIVE PROPAGATION DELAY
INPUT
100mV/div
INPUT
100mV/div
OUTPUT
Q
OUTPUT
Q
1V/div
1V/div
Q
Q
5ns/div
5ns/div
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
INDUSTRY-STANDARD
686 RESPONSE
MAX912/MAX913 RESPONSE
INPUT
20mV/div
INPUT
20mV/div
OUTPUT
Q
1V/div
OUTPUT
Q
1V/div
Q
1V/div
20µs/div
Q
1V/div
20µs/div
_______________________________________________________________________________________
5
MAX912/MAX913
Typical Operating Characteristics (continued)
(V+ = +5V, V- = -5V, VLE = 0V, CL = 15pF, TA = +25°C, unless otherwise noted.)
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
MAX912/MAX913
MAX912 Pin Description
PIN
NAME
FUNCTION
1
QA
Comparator A TTL Output
2
QA
Comparator A Complementary TTL Output
3, 14
GND
Logic Ground. Connect both GND pins to ground.
4
LEA
Comparator A Latch Enable. QA and QA are latched when LEA is TTL high or floating. Comparator A
latch is transparent when LEA is low.
5, 12
N.C.
No Connection. Not internally connected.
6
V-
Negative Power Supply. -5V for dual supplies (bypass to GND with a 0.1µF capacitor) or GND for a
single supply.
7
INA-
Comparator A Inverting Input
8
INA+
Comparator A Noninverting Input
9
INB+
Comparator B Noninverting Input
10
INB-
Comparator B Inverting Input
11
V+
Positive Power Supply, +5V. Bypass to GND with a 0.1µF capacitor.
13
LEB
Comparator B Latch Enable. QB and QB are latched when LEB is TTL high or floating. Comparator B
latch is transparent when LEB is low.
15
QB
Comparator B Complementary TTL Output
16
QB
Comparator B TTL Output
MAX913 Pin Description
PIN
6
NAME
FUNCTION
1
V+
2
IN+
Positive Power Supply. Bypass to GND with a 0.1µF capacitor.
Noninverting Input
3
IN-
Inverting Input
4
V-
Negative Power Supply. -5V for dual supplies (bypass to GND with a 0.1µF capacitor) or GND for a
single supply.
5
LE
Latch Enable. Q and Q are latched when LE is TTL high or floating. The comparator latch is
transparent when LE is low.
6
GND
7
Q
TTL Output
8
Q
Complementary TTL Output
Logic Ground
_______________________________________________________________________________________
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
The MAX912 (dual) and MAX913 (single) 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.
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
+25°C. 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.
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.
tSU
VIN
(DIFFERENTIAL)
tH
LATCH
ENABLE (LE)
tLPD
tPD+
Q
∆tPD
Q
tPD-
Figure 1. Timing Diagram
_______________________________________________________________________________________
7
MAX912/MAX913
Detailed Description
MAX912/MAX913
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
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 +3.5). 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 0.1µF to 1.0µF ceramic capacitors in parallel
with 10µF or greater tantalum capacitors. Connect the
ceramic capacitors very close to the MAX912/MAX913’s
supply pins, keeping leads short to minimize lead inductance. For particularly noisy applications, use ferrite
beads on the power-supply lines.
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.
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.
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 +25°C (Figure 1). With a 20mV overdrive, the
maximum propagation delay is 12ns and the clock signal rate is 85MHz.
IN+
HYSTERESIS
BAND*
IN-
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 Information
MAX912 TRANSISTOR COUNT: 285
MAX913 TRANSISTOR COUNT: 154
PROCESS: Bipolar
8
_______________________________________________________________________________________
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
8
INCHES
DIM
A
A1
A2
b
E
ÿ 0.50±0.1
H
c
D
e
E
H
0.6±0.1
L
1
1
α
0.6±0.1
S
BOTTOM VIEW
D
MIN
0.002
0.030
MAX
0.043
0.006
0.037
0.014
0.010
0.007
0.005
0.120
0.116
0.0256 BSC
0.120
0.116
0.198
0.188
0.026
0.016
6∞
0∞
0.0207 BSC
8LUMAXD.EPS
4X S
8
MILLIMETERS
MAX
MIN
0.05
0.75
1.10
0.15
0.95
0.25
0.36
0.13
0.18
2.95
3.05
0.65 BSC
2.95
3.05
5.03
4.78
0.41
0.66
0∞
6∞
0.5250 BSC
TOP VIEW
A1
A2
A
α
c
e
b
FRONT VIEW
L
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0036
REV.
J
1
1
_______________________________________________________________________________________
9
MAX912/MAX913
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
DIM
A
A1
B
C
e
E
H
L
N
E
H
INCHES
MILLIMETERS
MAX
MIN
0.069
0.053
0.010
0.004
0.014
0.019
0.007
0.010
0.050 BSC
0.150
0.157
0.228
0.244
0.016
0.050
MAX
MIN
1.35
1.75
0.10
0.25
0.35
0.49
0.19
0.25
1.27 BSC
3.80
4.00
5.80
6.20
0.40
SOICN .EPS
MAX912/MAX913
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
1.27
VARIATIONS:
1
INCHES
TOP VIEW
DIM
D
D
D
MIN
0.189
0.337
0.386
MAX
0.197
0.344
0.394
MILLIMETERS
MIN
4.80
8.55
9.80
MAX
5.00
8.75
10.00
N MS012
8
AA
14
AB
16
AC
D
A
B
e
C
0∞-8∞
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
21-0041
10
______________________________________________________________________________________
REV.
B
1
1
Single/Dual, Ultra-Fast, Low-Power
Precision TTL Comparators
PDIPN.EPS
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX912/MAX913
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
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