The TC74HC139AFN is a high-speed CMOS dual 2-to-4 line decoder/demultiplexer fabricated with silicon gate CMOS technology. It achieves high-speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation. Each decoder consists of two inputs (A and B) and four outputs (Y0-Y3). Separate enable inputs (1G and 2G) are provided to control each decoder independently.

Applications

• Memory decoding
• Address decoding
• Data routing
• Demultiplexing applications
• Instrumentation and control systems

Features

• High-speed operation: tpd = 14 ns (typ.) at VCC = 5V
• Low power dissipation: ICC = 4 μA (max) at Ta = 25°C
• High noise immunity: VNIH = VNIL = 28 % VCC (min)
• Output drive capability: 10 LSTTL loads
• Symmetrical output impedance: |IOH| = IOL = 4 mA (min)
• Balanced propagation delays: tPLH ≈ tPHL
• Wide operating voltage range: VCC = 2 to 6 V
• Separate enable inputs for each decoder

Benefits

• High Speed: Enables fast address decoding and data routing.
• Low Power Consumption: Ideal for power-sensitive applications.
• High Noise Immunity: Ensures reliable operation in noisy environments.
• Wide Operating Voltage: Provides flexibility in power supply design.
• Dual Decoder: Offers two decoders in a single package, saving board space.
• Separate Enables: Allows for independent control of each decoder.

Additional Details

The TC74HC139AFN is supplied in a 16-pin SOP (Small Outline Package). The enable inputs, when high, force the outputs to a high level, regardless of the select inputs. The device operates over a temperature range of -40°C to +85°C. This part is suitable for applications requiring efficient memory and address selection due to its fast propagation delay and low power characteristics.