The MC74HC257N is a high-speed silicon-gate CMOS device featuring quad 2-input multiplexers with 3-state outputs. This device selects four bits of data from two sources under the control of a common Select input. The Enable input, when HIGH, forces all outputs to a high-impedance state. The HC257 is similar in function to the LS257.

Applications

• Data routing
• Signal gating
• Memory addressing
• Peripheral selection
• Digital logic systems

Features

• High Speed: tPD = 13 ns (typ) at VCC = 5V
• Low Power Dissipation: ICC = 4 μA (max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 30 % VCC
• Output Drive Capability: 10 LSTTL Loads
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 V to 6 V
• Low Input Current: 1 μA max

Benefits

• Improved system performance due to high speed operation.
• Reduced power consumption in battery-powered and energy-conscious applications.
• Enhanced noise immunity ensures reliable operation in noisy environments.
• Easy interfacing with various logic families simplifies system integration.
• Wide operating voltage range provides flexibility in power supply design.

Additional Details

The MC74HC257N is available in a DIP-16 (Dual In-line Package) package. It operates over a temperature range of -55°C to +125°C. The device features a propagation delay of 13ns typical, at 5V. The enable input allows for easy cascading and busing applications. The outputs are capable of driving 10 LSTTL loads, making it suitable for a wide range of digital logic applications. The input current is very low, which helps to further reduce power consumption. It is pin-compatible with the TTL 74LS257, allowing for easy upgrades in existing designs.