The TC74HC161AF is a high-speed CMOS synchronous presettable 4-bit binary counter fabricated with silicon gate CMOS technology. It achieves high-speed operation similar to equivalent bipolar Schottky TTL while maintaining the CMOS low power dissipation. This device is a synchronous, modulo-16 binary counter. All flip-flops are clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating.

Applications

• Frequency dividers
• Address counters in memory systems
• Timing circuits
• Digital data processing
• Control circuits

Features

• High-speed operation: fmax = 45 MHz (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(opr) = 2 V to 6 V
• Pin and function compatible with 74LS161

Benefits

• High-speed counting allows for accurate timing and control in various applications.
• Low power consumption makes it ideal for battery-powered devices and energy-efficient systems.
• High noise immunity ensures reliable operation in noisy environments.
• Strong output drive capability allows for interfacing with a wide range of devices.
• Balanced propagation delays simplify timing design and improve system performance.
• Wide operating voltage range provides flexibility in system design.

Additional Details

The TC74HC161AF features synchronous counting, meaning all flip-flops are clocked simultaneously. It also has a synchronous clear input that overrides counting and clears all flip-flops. The device also includes parallel load capability, allowing for presetting the counter to any desired value. The count enable inputs (CEP and CET) control whether the counter advances on each clock pulse. When both CEP and CET are high, the counter increments. A low level on either CEP or CET inhibits counting.

The TC74HC161AF is available in a SOP16 (Small Outline Package) and operates over a wide temperature range, typically -40°C to +85°C, making it suitable for various industrial and commercial applications.