CD4543 - BCD to 7 Segment Decoder IC

CD4543 - BCD to 7 Segment Decoder IC

The CD4543 IC is a BCD-to-seven segment latch/decoder/driver IC designed primarily for liquid-crystal display (LCD) applications. It is also capable of driving light-emitting diode (LED), incandescent, gas-discharge, and fluorescent displays. This device is functionally similar and serves as a direct replacement for the CD4056 when pin 7 is connected to VSS. It differs from the CD4056B in that it has a display blanking capability instead of a level-shifting function and requires only one power supply.

When the CD4056 is used in the level shifting mode, two power supplies are required. When the CD4543 is used for LCD applications, a square wave must be applied to the PHASE input and the backplane of the LCD device. For LED applications logic 1 is required at the PHASE input for common-cathode devices; logic 0 is required for common-anode devices (see truth table). The CD4543B is supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (M, M96, MT, and NSR suffixes), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).

Pinout:

Applications:

• Instrument display driver
• Dashboard display driver
• Computer/calculator display driver
• Timing device driver (clocks, watches, timers)