GENERAL DESCRIPTION
The PCF1171C is a single chip, 4.19 MHz CMOS car clock circuit indicating hours and minutes. It is designed to drive a 31⁄2 or 4-digit liquid crystal display (LCD).
Two external single-pole, single-throw switches will accomplish all time setting functions. A bonding option allows the selection of 12-hour or 24-hour display mode. The circuit is battery-operated via an internal 5 V voltage regulator or by an external stabilized voltage supply.

FEATURES
• Driving standard 31⁄2 or a 4-digit LCD
• Internal voltage regulator for 5 V LCD
• Option for external stabilized voltage supply
• 4.19 MHz oscillator
• Integrated oscillator output capacitor and polarization resistor
• Operating ambient temperature: −40 to +85 °C
• 40-lead plastic SMD, face down (VSO40).