7-54

December 1997

MIC5891

Micrel

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 OUTPUT

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

STROBE

4

SERIAL

DATA IN

3

CLOCK

2

GROUND

1

LOAD SUPPLY

13

OUTPUT

ENABLE

14

LOGIC SUPPLY

15

SERIAL

DATA OUT

16

10

11

12

9

OE

SHIFT

REGISTER

LATCHES

Functional Diagram

Pin Configurations

SERIAL

DATA OUT

OUTPUT

ENABLE

CLOCK

SERIAL

DATA IN

STROBE

GROUND

8-BIT SERIAL PARALLEL SHIFT REGISTER

LATCHES

MOS

BIPOLAR

Part Number

Temperature Range

Package

MIC5891BN

–40

°C to +85°C

16-Pin Plastic DIP

MIC5891BWM

–40

°C to +85°C

16-pin Wide SOIC

Ordering Information