MC14543BF - 3-18V BCD 7-Segment LCD Driver | onsemi
Référence : MC14543BF ✓ ActifMC14543BF Présentation
An LCD BCD-to-seven-segment decoder is a display-interface IC positioned between a digital control system and a segmented liquid-crystal display. In the signal hierarchy, it belongs to the decoder and display-driver class within integrated logic and interface circuits. Its internal latch captures the input code, allowing the connected logic to update a display value without unintended intermediate segment transitions during the storage interval.
The MC14543BF operates across a 3 V to 18 V supply range, allowing it to interface with both low-voltage and higher-voltage CMOS systems when its output drive requirements match the selected display. Its CMOS construction supports low-power operation in battery-powered equipment, while the integrated latch and 8421 BCD decoder reduce the number of external components required for a basic numeric display. The 16-pin SOIC package supports conventional surface-mount assembly.
Because liquid-crystal segments generally require an alternating drive rather than a static DC level, the MC14543BF is intended for displays with compatible drive characteristics. Its segment outputs should be connected in accordance with the manufacturer pin-description table and the display module's required common and segment arrangement. Designers should verify output timing, polarity, and segment mapping against the selected LCD rather than inferring them only from the segment labels.
Typical uses include compact digital meters, panel counters, small industrial readouts, laboratory equipment, and embedded control panels that receive BCD values from a microcontroller, counter, or system controller. It is especially appropriate where a dedicated numeric display is needed and the source already supplies a stable 4-bit BCD word. The latch function can simplify display updates and reduce intermediate visual states.
Design the PCB with a low-impedance ground return and route the BCD inputs away from sensitive analog or high-speed switching nodes. Confirm the LCD segment mapping, common-drive topology, logic levels, and supply decoupling on the schematic before fabrication. If the display requires LCD bias generation, backlight control, or multiple digits, those functions generally need additional circuitry.
This page combines the verified MC14543BF operating limits, package information, function description, sourcing workflow, and design guidance. It also distinguishes a true pin-to-pin replacement from merely similar seven-segment decoder functions by requiring identical package construction and confirmed electrical and pin compatibility.
Alternatives de remplacement direct pour MC14543BF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesMC14543BF Valeurs maximales et caractéristiques électriques
| Product Type | BCD-to-seven-segment latch, decoder, and driver |
| Supply Voltage Range | 3 V to 18 V |
| Input Code Format | 4-bit 8421 BCD |
| Logic Technology | CMOS enhancement-mode |
| Display Compatibility | Liquid-crystal seven-segment readouts |
| Boîtier | 16-pin SOIC |
| Nombre de broches | 16 pins |
| Type de montage | Surface mount |
| Integrated Storage Function | 4-bit storage latch |
| Integrated Decoding Function | BCD-to-seven-segment decoder |
| Integrated Drive Function | Seven-segment liquid-crystal driver |
Guide de configuration des broches du MC14543BF 16-pin soic
Configuration des broches du MC14543BF (boîtier 16-pin soic). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour MC14543BF.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MC14543BF convient pour 6 applications: Compact Digital Panel Meter, Laboratory Counter Readout, Industrial Equipment Numeric Display, Battery-Powered Digital Instrument, Embedded Control Panel Display, Small System Digital Readout.
Compact Digital Panel Meter
The MC14543BF fits a compact panel meter when the measurement subsystem already converts its value into a 4-bit 8421 BCD code. The integrated latch accepts the coded digit, while the decoder and liquid-crystal driver produce the segment outputs required by a compatible numeric LCD. Because the device operates from 3 V to 18 V, it can support instrument architectures spanning low-voltage portable products and higher-voltage industrial panels. Confirm the LCD segment map, output polarity, and latch timing against the onsemi MC14543BF manufacturer datasheet before fabrication.
Laboratory Counter Readout
A laboratory counter can use the MC14543BF to translate a BCD digit into a liquid-crystal display output without a separate decoder and storage latch. The 8421 input format is convenient for counter and measurement subsystems that already organize each decimal digit as four BCD lines. The 16-pin SOIC package allows conventional surface-mount assembly, and the stated 3 V to 18 V operating range supports multiple instrument voltage plans. Verify signal thresholds and display drive compatibility with the manufacturer datasheet, particularly when the LCD uses unusual common connections.
Industrial Equipment Numeric Display
The MC14543BF is suitable for a numeric readout in industrial equipment when the controller supplies stable 8421 BCD data and the display is a compatible liquid-crystal seven-segment type. Integrating the storage latch, decoder, and driver simplifies the display interface and can limit intermediate code transitions during an update. Its surface-mount 16-pin SOIC construction supports compact boards, while the 3 V to 18 V supply range accommodates varied industrial control rails. Confirm common-drive requirements and segment polarity in the manufacturer interface information.
Battery-Powered Digital Instrument
The MC14543BF can serve as the display interface in a battery-powered digital instrument when the logic rail and LCD requirements fall within the device's 3 V to 18 V operating range. Its CMOS enhancement-mode construction makes it relevant to low-power designs, while the integrated latch, decoder, and driver reduce the number of associated components. Actual battery suitability depends on the specified quiescent and display-active current, so calculate the average consumption from the manufacturer electrical characteristics and the selected LCD's drive duty cycle.
Embedded Control Panel Display
An embedded controller can drive a compact liquid-crystal readout through the MC14543BF when it outputs one decimal digit as an 8421 BCD word. The latch supports controlled display updates, and the integrated decoder reduces firmware and external hardware complexity. The device's 16-pin SOIC package is practical for compact control panels and is supported by a 3 V to 18 V operating range. Use the manufacturer pin table to route signals correctly, and verify that the panel's display polarity and common-drive arrangement match the MC14543BF outputs.
Small System Digital Readout
The MC14543BF works well as a small system readout for counters, timers, selectors, and measurement modules that naturally represent decimal data in 8421 BCD. It consolidates a 4-bit storage latch, BCD decoder, and liquid-crystal driver into one 16-pin SOIC device. This arrangement is useful when avoiding a discrete display interface reduces board area and assembly effort. Validate input timing, display polarity, and segment routing for the chosen LCD, and confirm that the source can hold each BCD word at the required latch interval.
Données de référence d'ingénierie pour MC14543BF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Notes de conception
Route the four BCD inputs and latch-control signal away from switching nodes and high-current return paths. Keep the device ground connection short and place the appropriate bypass capacitor close to the supply pins according to the manufacturer application guidance. For a 16-pin SOIC, confirm the package orientation and pin-1 location against the physical footprint rather than inferring connections from a generic seven-segment drawing.
Do not assume that a generic seven-segment decoder has interchangeable outputs. Verify that the candidate device uses 8421 BCD input, provides the required latch function, and produces outputs compatible with a liquid-crystal readout. LED-oriented decoders may use constant sink or source currents, while LCD devices may require a different polarity and common-drive arrangement. Check the complete pin description and display specification before assembly.
Use the latch input to make display updates deliberate, especially when the BCD source changes during a count operation. Account for propagation delay, setup time, and hold time in the onsemi MC14543BF manufacturer datasheet. A short local ground path and separation from display or power-converter switching signals will reduce the chance that a segment glitches while the BCD value is being captured.
Informations de conformité
Compliance status is not stated in the manufacturer or distributor material identified for this product.