MAXIM MAX975 MAX977 Single Dual, +3V +5V Dual-Speed Comparators with Auto-Standby User Manual

19-1141; Rev 2; 2/07

Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby General Description ____________________________Features

The MAX975/MAX977 single/dual comparators feature Three Operating Modes: three different operating modes, and are optimized for High Speed +3V and +5V single-supply applications. The operating High Speed with Auto-Standby modes are as follows: high speed, high speed with Low Power auto-standby, and low power. Propagation delay is 28ns

28ns Propagation Delay (high-speed mode)

in high-speed mode, while supply current is only 250µA.

Supply current is reduced to 3µA in low-power mode. 5µA Max Supply Current in Low-Power/ Auto-Standby Modes

The auto-standby feature allows the comparator to automatically change from low-power mode to high- +3V/+5V Single-Supply Operation speed mode upon receipt of an input signal. In the

Rail-to-Rail Outputs

absence of an input signal, the comparator reverts back to low-power mode after an adjustable timeout Ground-Sensing Input period. The timeout period for the MAX975 to enter

Internal Hysteresis (high-speed mode)

standby is set by a single capacitor. The dual MAX977

features independently adjustable timeout periods for Adjustable Timeout Period

each comparator using separate capacitors.

µMAX Package (MAX975) The MAX975/MAX977’s inputs have a common-mode QSOP-16 Package (MAX977)

voltage range of -0.2V to (VCC - 1.2V). The differential

Ordering Information

input voltage range extends rail to rail. The outputs are capable of rail-to-rail operation without external pull-up

PIN- PKG

PART TEMP RANGE

circuitry, making these devices ideal for interface with

PACKAGE CODE

CMOS/TTL logic. All inputs and outputs can tolerate a

MAX975ESA -40°C to +85°C 8 SO S8-2

continuous short-circuit fault condition to either rail. The

MAX975EUA-T -40°C to +85°C 8 µMAX-8 U8-1

comparator’s internal hysteresis in high-speed mode

ensures clean output switching, even with slow-moving MAX977ESD -40°C to +85°C 14 SO S14-1

input signals.

MAX977EEE -40°C to +85°C 16 QSOP E16-1

The single MAX975 is available in 8-pin SO and 8-pin

Functional Diagram

µMAX® packages, while the dual MAX977 is available in 14-pin SO and 16-pin QSOP packages.

________________________Applications

MAX975

Battery-Powered Systems LP RF ID Tags

HIGH SPEED

Keyless Entry

ENABLE

Threshold Detectors/Discriminators

TRANSITION

3V Systems

MONITOR

IR Receivers Digital-Line Receivers

LOW POWER GND

ENABLE

TIMING µMAX is a registered trademark of Maxim Integrated Products, Inc. CIRCUIT

STAT STO

Pin Configurations appear at end of data sheet.

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.