Overview
The MC14543B BCD-to-Seven Segment Latch/Decoder/Driver is a versatile integrated circuit designed for use with various display readouts, including liquid crystal, light-emitting diode (LED), incandescent, gas discharge, and fluorescent displays. Constructed with complementary MOS (CMOS) enhancement mode devices, this chip provides the functions of a 4-bit storage latch and an 8421 BCD-to-seven segment decoder and driver. It is capable of inverting the logic levels of the output combination and features inputs for phase, blanking, and latch disable.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| DC Supply Voltage Range | VDD | -0.5 to +18.0 | V |
| Input Voltage Range, All Inputs | Vin | -0.5 to VDD + 0.5 | V |
| Power Dissipation per Package | PD | 500 | mW |
| Operating Temperature Range | TA | -55 to +125 | °C |
| Storage Temperature Range | Tstg | -65 to +150 | °C |
| Maximum Continuous Output Drive Current (Source or Sink) | IOHmax, IOLmax | 10 | mA |
| Output Voltage “0” Level | VOL | 0.05 | Vdc |
| Output Voltage “1” Level | VOH | 4.95 to 14.95 | Vdc |
Key Features
- Latch Storage of Code
- Blanking Input
- Readout Blanking on All Illegal Input Combinations
- Direct LED (Common Anode or Cathode) Driving Capability
- Supply Voltage Range = 3.0 V to 18 V
- Capable of Driving 2 Low-power TTL Loads, 1 Low-power Schottky TTL Load or 2 HTL Loads Over the Rated Temperature Range
- Pin-for-Pin Replacement for CD4056A (with Pin 7 Tied to VSS)
- Chip Complexity: 207 FETs or 52 Equivalent Gates
- NLV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q100 Qualified and PPAP Capable
- Pb-Free and RoHS Compliant
Applications
- Instrument Display Driver (e.g., counter, DVM)
- Computer/Calculator Display Driver
- Cockpit Display Driver
- Clock, Watch, and Timer Uses
Q & A
- What is the primary function of the MC14543B?
The MC14543B is a BCD-to-seven segment latch/decoder/driver designed for use with various display readouts.
- What types of displays can the MC14543B drive?
The MC14543B can drive liquid crystal, LED, incandescent, gas discharge, and fluorescent displays.
- What is the supply voltage range for the MC14543B?
The supply voltage range is from 3.0 V to 18 V.
- Can the MC14543B drive TTL loads?
Yes, it can drive 2 low-power TTL loads, 1 low-power Schottky TTL load, or 2 HTL loads over the rated temperature range.
- Is the MC14543B Pb-Free and RoHS compliant?
Yes, the MC14543B is Pb-Free and RoHS compliant.
- What are the operating and storage temperature ranges for the MC14543B?
The operating temperature range is -55 to +125°C, and the storage temperature range is -65 to +150°C.
- What is the maximum continuous output drive current for the MC14543B?
The maximum continuous output drive current is 10 mA (source or sink).
- Can the MC14543B be used in automotive applications?
Yes, it is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- What are some common applications of the MC14543B?
Common applications include instrument display drivers, computer/calculator display drivers, cockpit display drivers, and various clock, watch, and timer uses.
- How does the MC14543B handle illegal input combinations?
The MC14543B blanks the readout on all illegal input combinations.
