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U2391B Datasheet

Quartz Controlled Pulse Generator

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Quartz Controlled Pulse Generator
U2391B
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 Standard quartz fosc = 32.768 kHz
D Minimum operating voltage 4.5 V/1.5 mA
D Pulse width, tp = 31.25 ms
D Power stage with current limitation:
typical 150 mA
D Tristate period selection: 1/36/60 s
yD Reset and disable possibility
D Operation with C 33 pF, as operational time
counter possible
D Minimum dimensions due to SO-case
Application
Operational time counter
Case: SO8
Block Diagram
10 mF
wRL 10 x VS in Ohm
390 W
VS = 4.75 to 14 V
60 s
36 s
1s
+
m0.22 F
+
Reset
Interrupt
1
60
Tristate 36
Selection
logic
1
2
Pulse former
3
Programmable
divider
8
Switch on
monitoring
1 Hz
16 Hz
Divider 24
To test
7
Divider 27
Oscillator
6
5 32768 Hz
Reset
4
Tristate Start with VS
Interrupt
Divider 24
2048 Hz
Figure 1. Block diagram with external circuit
96 11740
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
1 (7)
TEMIC Semiconductors
TEMIC Semiconductors



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