This data sheet introduces the features and characteristics of the HEF4543B BCD to 7-segment latch/decoder/driver.
The HEF4543B provides a 4‑bit storage latch and an 8‑4‑2‑1 BCD‑to‑7‑segment decoder/driver. It features active‑high latch‑disable (LD), blanking (BI) and phase (PH) inputs, and seven buffered segment outputs for driving liquid‑crystal, LED, fluorescent, incandescent, and gas‑discharge displays.
The device is offered in several 16‑lead packages: plastic DIL (GOT38‑1), ceramic DIL (SOT74), and plastic SO (SOT109‑1). Typical electrical characteristics include input transition times under 20 ns, propagation delays around 75 ns, and a supply voltage defined as Vop.
| Package Types | 16‑lead DIL plastic (GOT38‑1), 16‑lead DIL ceramic (SOT74), 16‑lead SO plastic (SOT109‑1) |
|---|---|
| Input transition time | <20 ns |
| Propagation delay HIGH to LOW (typ) | 75 ns |
| Supply voltage (Vop) | Vop = supply voltage (V) |
| Phase input (PH) | Active HIGH |
It can drive LCD, LED, fluorescent, incandescent, and gas‑discharge displays.
The input transition time is less than 20 ns.
PH is the phase input and is active HIGH.