Product Overview: 74HCT4543 - BCD to 7-Segment Latch/Decoder/Driver

The 74HCT4543 is a high-speed Si-gate CMOS device from NXP Semiconductors designed to interface between a BCD (Binary Coded Decimal) input and a 7-segment display. It is specifically tailored for driving liquid crystal displays (LCD) and provides the necessary signals to ensure clear and accurate digital readouts. This integrated circuit (IC) is part of the 74HCT family, which means it combines the low power consumption of standard CMOS with the speed of TTL devices.

Key Features

• Logic Family: HCT
• Output Type: LCD
• Supply Voltage Range: 4.5V to 5.5V
• Logic Case Style: SOIC
• No. of Pins: 16
• Operating Temperature Range: -40°C to +125°C

Functional Description

The 74HCT4543 IC includes a BCD to 7-segment decoder, a latch, and a 7-segment driver. It takes a 4-bit BCD input and decodes this to drive a 7-segment LCD. The device includes an active low lamp test input (LT), which can be used to test the display, and a ripple blanking input (BI) and output (BO) to control leading/trailing zero suppression. The phase input (PH) is used to adjust the phase of the drive signals to the common backplane of the LCD.

Applications

This IC is commonly used in applications requiring digital numeric displays, such as:

• Digital clocks and timers
• Instrumentation displays
• Calculators
• Electronic meters (e.g., voltmeters, frequency counters)
• Other consumer electronics requiring numeric displays

Quality and Reliability

NXP Semiconductors is committed to delivering high-quality products. The 74HCT4543 is manufactured under strict quality control standards and is designed to meet the industry's high reliability requirements.