器件名称: U2391B
功能描述: Quartz Controlled Pulse Generator
文件大小: 78.8KB 共7页
简 介: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 fosc = 32.768 kHz Minimum operating voltage 4.5 V/1.5 mA Pulse width, tp = 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
RL
w 10 x V
S
in Ohm 390 W
VS = 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 VS 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)
U2391B
Pin Description
Pin 1 2 3 4 5, 6 7 8 Symbol Period GND Output Contr. Osc. Test VS Function Period selection input Ground Output control pulse Control input Quartz-oscillator input Test logic input/output Supply volta……
