U2391B

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 voltag...