October 1998

7-15

Micrel

MIC5800/5801

7

Truth Table

Output

Strobe

Clear

Enable

t-1

t

0

1

0

0

X

OFF

11

0

0

X

ON

X

X

1

X

X

OFF

X

X

X

1

X

OFF

X

0

0

0

ON

ON

X

0

0

0

OFF

OFF

X = Irrelevant

t-1 = previous output state

t = present output state

Information present at an input is transferred to its latch when

the STROBE is high. A high CLEAR input will set all latches

to the output OFF condition regardless of the data or

STROBE input levels. A high OUTPUT ENABLE will set all

outputs to the off condition, regardless of any other input

conditions. When the OUTPUT ENABLE is low, the outputs

depend on the state of their respective latches.

Typical Application

Unipolar Stepper-Motor Drive

MIC5800

UNIPOLAR WAVE DRIVE

UNIPOLAR 2-PHASE DRIVE

STROBE

IN1

OUT 1

IN2

IN3

IN4

OUT 2

OUT 3

OUT 4

STROBE

IN1

OUT 1

IN2

IN3

IN4

OUT 2

OUT 3

OUT 4

8

9

2

3

4

5

6

7

1

14

13

12

11

10

VDD

OUT1

OUT2

OUT3

OUT4

IN4

IN3

IN2

IN1

STROBE

CLEAR

µP

0.1µF

+30V

0.1µF

+30V

STEPPER

MOTOR

OUTPUT ENABLE