CD4543S

The CD4543 is a BCD- to- seven segment latch/decoder/driver 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 to and serves as direct replacement for the CD4056 when pin7 is connected to VSS. It differs from the CD4056 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 CD45438 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 a logic 0 is required at the PHASE input for common- cathode devices; a logic1 is required for common- anode devices (see truth table).

Key features

• Display blanking of all illegal input combinations
• Latch storage of code
• Direct LED driving capability
• 100% tested for quiescent current at 18V
• Maximum input current of 1μA at 18V and 25°C
• 5V, 10V, and 15V parametric ratings