# U2391B Quartz Controlled Pulse Generator

## Description & Features

️· Function: Quartz controlled pulse generator for applications like operational time counters.
️· Key Features:
- Standard quartz frequency: 32.768 kHz
- Minimum operating voltage: 4.5 V / 1.5 mA
- Pulse width: 31.25 ms
- Current limitation: Typical 150 mA (short circuit protected)
- Period selection: 1/36/60 seconds (tristate)
- Reset and disable capability
- SO8 package for compact size.

## Pin Description

Pin	Symbol	Function
1	Period	Period selection input
2	GND	Ground
3	Output	Output pulse control
4	Contr.	Control input
5, 6	Osc.	Quartz oscillator input
7	Test	Test logic input/output
8	V<sub>S</sub>	Supply voltage

️· Period Selection (Pin 1): Open = standard, Ground = 1s, V_S = 60s.
️· Control Logic (Pin 4): Delay, reset, and interruption functions.

## Electrical Characteristics

️· Supply Voltage: 4.5V - 14V (typical), up to 28.8V with limitations.
️· Supply Current: 1.2 - 2mA (at 5V)
️· Output Current: Max 150mA, with protection.
️· Operating Temperature: -20 to +100°C (ambient).

## Applications & Diagrams

️· Standard circuit example provided for V_S = 4.75 to 14V.
️· Diagrams show test configurations.

## Absolute Maximum Ratings

️· Supply Voltage: 13.2V
️· Power Dissipation: 270mW (Tamb = 45°C), 135mW (Tamb = 85°C)
️· Storage Temperature: -40 to +125°C.

## Ozone Depleting Substances Policy

️· The device is manufactured without ozone-depleting substances, adhering to international environmental regulations.