May 2006

1

MIC5891

MIC5891

Micrel, Inc.

MIC5891

Features

•

High-voltage, high-current outputs

•

Output transient protection diodes

•

CMOS-, PMOS-, NMOS-, and TTL-compatible inputs

•

5MHz typical data input rate

•

Low-power CMOS latches

Applications

•

Alphanumeric and bar graph displays

•

LED and incandescent displays

•

Relay and solenoid drivers

•

Other high-power loads

General Description

The MIC5891 latched driver is a high-voltage, high current

integrated circuit comprised of eight CMOS data latches,

CMOS control circuitry for the common STROBE and OUT-

PUT ENABLE, and bipolar Darlington transistor drivers for

each latch.

Bipolar/MOS construction provides extremely low power

latches with maximum interface flexibility.

The MIC5891 will typically operate at 5MHz with a 5V logic

supply.

The CMOS inputs are compatible with standard CMOS,

PMOS, and NMOS logic levels. TTL circuits may be used

with appropriate pull-up resistors to ensure a proper logic-

high input.

A CMOS serial data output allows additional drivers to be

cascaded when more than 8 bits are required.

The MIC5891 has open-emitter outputs with suppression

diodes for protection against inductive load transients. The

output transistors are capable of sourcing 500mA and will

sustain at least 35V in the on-state.

Simultaneous operation of all drivers at maximum rated

current requires a reduction in duty cycle due to package

power limitations. Outputs may be paralleled for higher load

current capability.

The MIC5891 is available in a 16-pin plastic DIP package

(N) and 16-pin wide SOIC package (WM).

8-Bit Serial-Input Latched Source Driver

Functional Diagram

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

SERIAL

DATA OUT

OUTPUT

ENABLE

CLOCK

SERIAL

DATA IN

STROBE

GROUND

8-BIT SERIAL PARALLEL SHIFT REGISTER

LATCHES

MOS

BIPOLAR