CD4543B BCD-to-7-Segment Latch

@@ -0,0 +1,63 @@+# CD4543B++**Texas Instruments** · Display Driver · SOIC-16++The CD4543B is a BCD-to-7-segment latch, decoder, and driver for liquid-crystal and LED displays. It latches a BCD input and drives the seven segment outputs, with a phase (Ph) input that lets it drive LCDs directly from a backplane square wave or LEDs with a fixed level. A blanking input turns all segments off.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | LD | input | Latch Disable. When LD=1 the BCD inputs A-D are transparent to the decoder; when LD=0 the last BCD code is stored and the display is frozen. Minimum latch-disable pulse width tWH = 125 ns typ at VDD=5 V. |+| 2 | C | input | BCD data input, weight 2^2 (bit 2). CMOS input with typ 5 pF input capacitance; VIH/VIL = 3.5/1.5 V at VDD=5 V. |+| 3 | B | input | BCD data input, weight 2^1 (bit 1). CMOS input, latched by LD. |+| 4 | D | input | BCD data input, weight 2^3 (MSB). CMOS input, latched by LD. |+| 5 | A | input | BCD data input, weight 2^0 (LSB). CMOS input, latched by LD. |+| 6 | PHASE | input | Phase / Ph input. Selects the polarity of the seven-segment outputs. For LCD drive, apply a square wave (common-plane signal). For common-cathode LEDs tie Ph=0; for common-anode LEDs tie Ph=1. |+| 7 | BLANKING | input | Blanking (BI) input. When BI=1 all seven segment outputs are forced to the inactive state (display blanked). When BI=0 the decoded pattern (XOR'd with Ph) is presented on a-g. Tie to VSS for a pin-compatible replacement of the CD4056B. |+| 8 | VSS | power_in | Negative supply / ground reference. Voltage range 0 V; all input/output voltages are referenced to VSS. |+| 9 | a | output | Seven-segment output 'a'. CMOS push-pull driver; capable of driving two low-power TTL loads, two HTL loads, one low-power Schottky load, LCD segment (via square-wave Ph) or LED segment directly. IOL/IOH ~1 mA typ at VDD=5 V. |+| 10 | b | output | Seven-segment output 'b'. CMOS push-pull segment driver, same characteristics as segment a. |+| 11 | c | output | Seven-segment output 'c'. CMOS push-pull segment driver. |+| 12 | d | output | Seven-segment output 'd'. CMOS push-pull segment driver. |+| 13 | e | output | Seven-segment output 'e'. CMOS push-pull segment driver. |+| 14 | g | output | Seven-segment output 'g' (center bar). CMOS push-pull segment driver. |+| 15 | f | output | Seven-segment output 'f'. CMOS push-pull segment driver. |+| 16 | VDD | power_in | Positive supply. Recommended VDD-VSS = 3 V to 18 V (absolute maximum 20 V). Quiescent IDD 0.04 µA typ at VDD=5 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | BCD-to-7-segment latch / decoder / driver |+| Logic family | 4000B (CMOS) |+| Display types | LCD (with phase input) or LED |+| Features | Latch, ripple blanking, phase input |+| Supply voltage | 3 V to 18 V |+| Operating temperature | -55 C to 125 C |++## Ordering variants++- `CD4543BE`+- `CD4543BM`+- `CD4543BM96`+- `CD4543BNSR`+- `CD4543BPW`+- `CD4543BPWR`+- `CD4543BMT`++## CAD (KiCad official)++- Symbol: `cd4543.kicad_sym`+- Footprint: `cd4543.kicad_mod`+- 3D model: SOIC-16 body from KiCad `Package_SO/SOIC-16_3.9x9.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/cd4543b.pdf) (20 pp, sha256 `a1121ae23a462a55`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/cd4543-datasheet.pdf)

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