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
1 (7)
TEMIC [ TEMIC SEMICONDUCTORS ]
