MIC59P50

Micrel

7-58

October 1998

IN

Circuitry below dashed line is

included in each of the 8 channels.

STROBE

VDD

2.2R

1.25V

R

+

–

UVLO

CLEAR

ENABLE/RESET

ISHUTDOWN

COMMON

S

R

Q

R1

70k

R2

3k

VEE

OUTPUT

THERMAL

SHUTDOWN

IREF

IOUT / N

FLAG

+

–

General Description

The MIC59P50 parallel-input latched driver is a high-voltage

(80V), high-current (500mA) integrated circuit comprised of

eight CMOS data latches, a bipolar Darlington transistor

driver for each latch, and CMOS control circuitry for the

common CLEAR, STROBE, and OUTPUT ENABLE func-

tions. Similar to the MIC5801, additional protection circuitry

supplied on this device includes thermal shutdown, under

voltage lockout (UVLO), and over-current shutdown.

The bipolar/MOS combination provides an extremely low-

power latch with maximum interface flexibility. The MIC59P50

has open-collector outputs capable of sinking 500mA and

integral diodes for inductive load transient suppression with

a minimum output breakdown voltage rating of 80V above V

EE

(50V sustaining). The drivers can be operated with a split

supply, where the negative supply is down to –20V and may

be paralleled for higher load current capability.

With a 5V logic supply, the MIC59P50 will typically operate at

better than 5MHz. With a 12V logic supply, significantly

higher speeds are obtained. The CMOS inputs are compat-

ible with standard CMOS, PMOS, and NMOS circuits. TTL

circuits may require pull-up resistors.

Each of these eight outputs has an independent over-current

shutdown at 500 mA. Upon current shutdown, the affected

cycled or the ENABLE/RESET pin is pulsed high. Current

pulses less than 2

µs will not activate over-current shutdown.

Temperatures above 165

°C will shut down the device and

activate the open collector FLAG output at pin 1. The UVLO

circuit disables the outputs at low V

provided.

Ordering Information

Part Number

Temperature Range

Package

MIC59P50BN

–40

°C to +85°C

24-Pin Plastic DIP*

MIC59P50BV

–40

°C to +85°C

28-Pin PLCC

MIC59P50BWM

–40

°C to +85°C

24-Pin Wide SOIC

Features

• 4.4 MHz Minimum Data Input Rate

• High-Voltage, High-Current Outputs

• Per-Output Over-Current Shutdown (500mA Typical)

• Undervoltage Lockout

• Thermal Shutdown

• Output Fault Flag

• Output Transient Protection Diodes

• CMOS, PMOS, NMOS, and TTL Compatible Inputs

• Internal Pull-Down Resistors

• Low-Power CMOS Latches

• Single or Split Supply Operation

Functional Diagram

Pin Configuration

(DIP and SOIC)

* 300-mil “skinny DIP”

MIC59P50

8-Bit Parallel-Input Protected Latched Driver

12

11

10

9

8

7

6

5

4

3

2

1

UVLO

ILIMIT

THERMAL

SHUTDOWN

13

14

15

16

17

18

19

20

21

22

23

24

VEE

IN 8

IN 7

IN 6

IN 5

IN 4

IN 3

IN 2

IN 1

CLEAR

FLAG

STROBE

VSS

ENABLE/RESET

VDD

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUT 7

OUT 8

COMMON

OUTPUT