The TC74HC279AP is a high-speed CMOS quad S-R latch fabricated with silicon gate CMOS technology. This device provides four independent set-reset (S-R) latches in a 16-pin package. The HC279AP achieves high-speed operation similar to equivalent Schottky TTL while maintaining the low power dissipation of CMOS.

Applications

• Data storage elements in digital systems
• Control circuits
• Flip-flop replacement where edge-triggering is not required
• Simple memory functions

Features

• High Speed: tpd = 11ns (typ.) at VCC = 5V
• Low Power Dissipation: ICC = 2μA (max.) at Ta = 25°C
• High Noise Immunity: VNIH = VNIL = 28% VCC (min.)
• Output Drive Capability: 10 LSTTL Loads
• Symmetrical Output Impedance: |IOH| = IOL = 4mA (min.)
• Balanced Propagation Delays: tPLH ≈ tPHL
• Wide Operating Voltage Range: VCC = 2V to 6V

Benefits

• Fast switching speeds enable use in high-performance digital circuits.
• Low power consumption makes it ideal for battery-powered or energy-efficient applications.
• High noise immunity ensures reliable operation in noisy environments.
• Wide operating voltage range provides flexibility in system design.
• Direct compatibility with TTL devices simplifies interfacing with existing logic circuits.

The TC74HC279AP's inputs are equipped with protection circuits against static discharge or transient excess voltage. All floating inputs must be tied to a defined logic level using suitable pull-up or pull-down resistors to ensure proper device operation.

Absolute Maximum Ratings: Supply Voltage (VCC): -0.5V to 7V; DC Input Voltage (VIN): -0.5V to VCC + 0.5V; DC Output Voltage (VOUT): -0.5V to VCC + 0.5V; DC Output Current (IOUT): ±25mA; Power Dissipation (PD): 500mW; Storage Temperature (Tstg): -65°C to 150°C.