MC14543B/D is a BCD-to-seven-segment latch/decoder/driver designed and manufactured by Semiconductor Components Industries, LLC, USA. It can be used with liquid crystal displays and is constructed with complementary MOS (CMOS) enhancement mode devices. The circuit provides the functions of a 4-bit storage latch and an 8421 BCD-to-seven segment decoder and driver. The device has the capability to invert the logic levels of the output combination. The phase (Ph), blanking (BI), and latch disable (LD) inputs are used to reverse the truth table phase, blank the display, and store a BCD code, respectively. For liquid crystal (LC) readouts, a square wave is applied to the Ph input of the circuit and the electrically common backplane of the display. The outputs of the circuit are connected directly to the segments of the LC readout. For other types of readouts, such as light-emitting diode (LED), incandescent, gas discharge, and fluorescent readouts, connection diagrams are given on this data sheet. Applications include instrument (e.g., counter, DVM etc.) display driver, computer/calculator display driver, cockpit display driver, and various clock, watch, and timer uses.
The MC14543B provides a 4‑bit storage latch combined with an 8421 BCD‑to‑seven‑segment decoder and driver. It is designed for liquid‑crystal (LC) readouts but can also drive LED, incandescent, gas‑discharge and fluorescent displays. The device includes phase (Ph), blanking (BD) and latch‑disable (LD) inputs for display control and can invert output logic levels.
Typical specifications include a supply voltage range of 3.0 V to 18 V, maximum continuous output current of 10 mA per segment, and operation over –55 °C to +125 °C. The part is offered in PDIP‑16, SOIC‑16 and EIAJ‑SOIC‑16 packages, with pin‑for‑pin compatibility to the CD4056A. Detailed electrical and switching characteristics, pin assignments, and connection diagrams are provided.
| Supply Voltage Range | 3.0 V to 18 V |
|---|---|
| Maximum Continuous Output Current | 10 mA per output |
| Maximum Continuous Output Power | 70 mW per output |
| Operating Temperature Range | -55 °C to +125 °C |
| Storage Temperature Range | -65 °C to +150 °C |
| Chip Complexity | 207 FETs or 52 Equivalent Gates |
| Pin‑for‑Pin Replacement | CD4056A (with Pin 7 tied to Vgs) |
It operates from 3.0 V up to 18 V.
Each output can source or sink up to 10 mA continuously.
Yes, it is a pin‑for‑pin replacement for the CD4056A when Pin 7 is tied to Vgs.