October 1998

7-37

Micrel

MIC5821/5822

7

MIC5821/5822

8-Bit Serial-Input Latched Drivers

General Description

BiCMOS technology gives the MIC5821/5822 family flexibil-

ity beyond the reach of standard logic buffers and power

driver arrays. These devices each have an eight-bit CMOS

shift register, CMOS control circuitry, eight CMOS data

latches, and eight bipolar current-sink Darlington output

drivers. The 500mA outputs are suitable for use with incan-

descent bulbs and other moderate to high current loads. The

drivers can be operated with a split supply where the negative

supply is down to –20V. Except for maximum driver output

voltage ratings, the MIC5821 and MIC5822 are identical.

These devices have greatly improved data-input rates. With

a 5V logic supply they will typically operate faster than 5

MHz. With a 12V supply significantly higher speeds are

obtained. The CMOS inputs are compatible with standard

CMOS, PMOS, and NMOS logic levels. TTL and DTL circuits

may require the use of appropriate pull-up resistors. By using

the serial data output, the drivers can be cascaded for

interface applications requiring additional drive lines.

Features

• 3.3 MHz Minimum Data-Input Rate

• CMOS, PMOS, NMOS, TTL Compatible

• Internal Pull-Down or Pull-Up Resistors

• Low-Power CMOS Logic and Latches

• High-Voltage Current-Sink Outputs

• Single or Split Supply Operation

Ordering Information

Part Number

Temperature Range

Package

MIC5821BN

–40

°C to +85°C

16-Pin Plastic DIP

MIC5822BN

–40

°C to +85°C

16-Pin Plastic DIP

8-BIT SERIAL-PARALLEL SHIFT REGISTER

5

SERIAL

DATA OUT

CLK

1

2

3

SERIAL

DATA IN

9

STROBE

OUTPUT ENABLE

(ACTIVE LOW)

Bipolar

MOS

LATCHES

10

11

12

13

14

15

16

4

6

7

Sub

GND

8

Functional Diagram

Pin Configuration

1

2

3

4

5

6

7

12

11

10

9

VDD

1

OUT

2

OUT

3

OUT

4

OUT

CLOCK

SERIAL DATA OUT

SS

V

8

13

14

15

5

OUT

6

OUT

7

OUT

8

OUT

SERIAL DATA IN

STROBE

OUTPUT ENABLE

SUB

VEE

16

(Plastic DIP)