Rainbow Electronics MAX977 - Manual

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 250
µ
A.
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
µ
MAX packages, while the dual MAX977 is available in
14-pin SO and 16-pin QSOP packages.
________________________Applications
Battery-Powered Systems
RF ID Tags
Keyless Entry
Threshold Detectors/Discriminators
3V Systems
IR Receivers
Digital-Line Receivers
____________________________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)
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
________________________________________________________________ Maxim Integrated Products 1
Functional Diagram
19-1141; Rev 1; 11/98
PART
MAX975 ESA
MAX975EUA
MAX977 ESD -40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
8 SO
8 µMAX
14 SO
Ordering Information
Pin Configurations appear at end of data sheet.
MAX977EEE -40°C to +85°C 16 QSOP
MAX975
V CC
IN+
LP
OUT
GND
STO
HIGH SPEED
LOW POWER
ENABLE
IN-
STAT
TIMING
CIRCUIT
ENABLE
TRANSITION
MONITOR
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For small orders, phone 1-800-835-8769.