19-1141; Rev 1; 11/98
S in g le /Du a l, +3 V/+5 V Du a l-S p e e d
Co m p a ra t o rs w it h Au t o -S t a n d b y
5/MAX97
Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
The MAX975/MAX977 single/dual comparators feature
three different operating modes, and are optimized for
+3V and +5V single-supply applications. The operating
modes are as follows: high speed, high speed with
auto-standby, and low power. Propagation delay is 28ns
in high-speed mode, while supply current is only 250µA.
Supply current is reduced to 3µA in low-power mode.
♦ Three Operating Modes:
High Speed
High Speed with Auto-Standby
Low Power
♦ 28ns Propagation Delay (high-speed mode)
♦ 5µA Max Supply Current in Low-Power/
Auto-Standby Modes
The a uto-sta ndb y fe a ture a llows the c omp a ra tor to
automatically change from low-power mode to high-
speed mode upon receipt of an input signal. In the
absence of an input signal, the comparator reverts
back to low-power mode after an adjustable timeout
period. The timeout period for the MAX975 to enter
standby is set by a single capacitor. The dual MAX977
features independently adjustable timeout periods for
each comparator using separate capacitors.
♦ +3V/+5V Single-Supply Operation
♦ Rail-to-Rail Outputs
♦ Ground-Sensing Input
♦ Internal Hysteresis (high-speed mode)
♦ Adjustable Timeout Period
♦ µMAX Package (MAX975)
QSOP-16 Package (MAX977)
The MAX975/MAX977’s inputs have a common-mode
voltage range of -0.2V to (V
- 1.2V). The differential
CC
input voltage range extends rail to rail. The outputs are
capable of rail-to-rail operation without external pull-up
circuitry, making these devices ideal for interface with
CMOS/TTL logic. All inputs and outputs can tolerate a
continuous short-circuit fault condition to either rail. The
comparator’s internal hysteresis in high-speed mode
ensures clean output switching, even with slow-moving
input signals.
Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
MAX975ESA
MAX975EUA
MAX977ESD
MAX977EEE
8 µMAX
14 SO
16 QSOP
The single MAX975 is available in 8-pin SO and 8-pin
µMAX packages, while the dual MAX977 is available in
14-pin SO and 16-pin QSOP packages.
Fu n c t io n a l Dia g ra m
V
CC
________________________Ap p lic a t io n s
MAX975
IN+
Battery-Powered Systems
RF ID Tags
LP
HIGH SPEED
ENABLE
OUT
Keyless Entry
Threshold Detectors/Discriminators
3V Systems
TRANSITION
MONITOR
IR Receivers
Digital-Line Receivers
GND
LOW POWER
ENABLE
IN-
TIMING
CIRCUIT
STAT
STO
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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For small orders, phone 1-800-835-8769.