MAX975_07 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby

19-1141; Rev 2; 2/07
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
General Description
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.
The auto-standby feature allows the comparator 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.
The MAX975/MAX977’s inputs have a common-mode
voltage range of -0.2V to (V_CC - 1.2V). The differential
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.
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.
____________________________Features
♦ 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
♦ +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)
Ordering Information
PART
MAX975ESA
MAX975EUA-T
MAX977ESD
MAX977EEE
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
8 µMAX-8
14 SO
16 QSOP
PKG
CODE
S8-2
U8-1
S14-1
E16-1
Functional Diagram
________________________Applications
Battery-Powered Systems
RF ID Tags
Keyless Entry
Threshold Detectors/Discriminators
3V Systems
IR Receivers
Digital-Line Receivers
V_CC
IN+
MAX975
HIGH SPEED
ENABLE
LOW POWER
ENABLE
IN-
LP
OUT
TRANSITION
MONITOR
GND
µMAX is a registered trademark of Maxim Integrated Products, Inc.
STAT
Pin Configurations appear at end of data sheet.
TIMING
CIRCUIT
STO
________________________________________________________________ Maxim Integrated Products 1
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.