The CD74HCT40103E is a high-speed CMOS logic 8-bit synchronous down counter designed and manufactured by Texas Instruments. This integrated circuit is part of the HCT (High-Speed CMOS, TTL-compatible) family, which is known for combining the low power consumption of CMOS with the speed and driving capability of TTL.

Key Features

• Device Type: 8-Bit Synchronous Down Counter
• Logic Family: HCT
• Supply Voltage Range: 4.5V to 5.5V
• Count Frequency (Max): 35 MHz
• Operating Temperature Range: -55°C to 125°C
• Package / Case: DIP-16
• Propagation Delay Time: 18 ns
• Output Capability: Standard

Product Description

The CD74HCT40103E counter is a versatile device that is utilized in a wide range of applications including timers, frequency dividers, and event counters. It features a fully synchronous internal design, which ensures stable counting sequences free from the glitches typically associated with asynchronous (ripple-clock) counters.

The counter is presettable and incorporates a preset-enable and a carry-out signal for cascading multiple counters. When the counter reaches zero, the carry-out signal can be used to trigger an external circuit or to enable another counter, allowing for extended counting ranges.

Programming the CD74HCT40103E is straightforward, thanks to its parallel load capability. The counter can be initialized to any desired value by presenting the value on the data inputs while the preset-enable input is held high. The counter decrements on each positive-going transition of the clock input.

With its robust design and compatibility with the TTL logic levels, the CD74HCT40103E is a reliable choice for designers who require an 8-bit counter with high-speed performance and the advantages of CMOS technology. The device is available in a DIP-16 package, ensuring easy integration into a wide variety of systems.