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U2391B

Quartz Controlled Pulse Generator

Description

The monolithic integrated bipolar circuit, U2391B, is

designed as a quartz controlled pulse generator. The

tristate input enables the selection of different pulse

period durations. The internal switch-on monitoring

achieves the start up of the IC when the power-on occurs.

The output pulse can supply a drive signal upto 150 mA,

which is short circuit protected.

Features

D

D

D

D

D

D

D

D

Standard quartz f

osc

= 32.768 kHz

Minimum operating voltage 4.5 V/1.5 mA

Pulse width, t

p

= 31.25 ms

Power stage with current limitation:

typical 150 mA

Tristate period selection: 1/36/60 s

Reset and disable possibility

Operation with C 33 pF, as operational time

counter possible

Minimum dimensions due to SO-case

Application

Operational time counter

Case:

SO8

y

Block Diagram

R

L

w

10 x V

S

in Ohm

390

W

V

S

= 4.75 to 14 V

10 F

m

+

60 s

36 s

1s

1

Tristate

60

36

1

Selection

logic

8

Switch on

monitoring

1 Hz

16 Hz

Programmable

divider

2

Pulse former

Divider 2

4

To test

7

3

Divider 2

7

Oscillator

6

5

32768 Hz

0.22 F

+

Divider 2

4

Tristate

Reset

Start with V

S

Interrupt

Reset

Interrupt

m

4

2048 Hz

96 11740

Figure 1. Block diagram with external circuit

TELEFUNKEN Semiconductors

Rev. A1, 30-May-96

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  Quartz Controlled Pulse Generator
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