The document describes the features of the M74HC161 high-speed CMOS synchronous 4-bit binary presettable counter. It has high noise immunity, low power dissipation, and a wide operating voltage range.
The M74HC161 is a high-speed CMOS synchronous 4-bit binary presettable counter fabricated with silicon gate C2MOS technology. It features a clock input active on the rising edge, with both LOAD and CLEAR inputs active LOW. Presetting occurs synchronously on the rising edge of the clock, while the clear function is asynchronous. The device includes two enable inputs (TE and PE) and a CARRY output to facilitate easy cascading for N-bit counters without external gates.
All inputs are equipped with protection circuits against static discharge and transient excess voltage. The device operates over a wide voltage range of 2V to 6V and offers high noise immunity with VNIH and VNIL at 28% VCC (minimum). It is pin and function compatible with the 74 series 161.
| Maximum Clock Frequency (Typical) | 62 MHz |
|---|---|
| Quiescent Supply Current (Max) | 4 µA |
| Noise Immunity (Min) | 28 % VCC |
| Output Impedance (Min) | 4mA |
| Operating Voltage Range | 2V to 6V |
| Supply Voltage (Recommended) | 2 to 6 V |
| Operating Temperature Range | -55 to 125 °C |
| Technology | Silicon gate C2MOS |
Yes, the M74HC161 is pin and function compatible with the 74 series 161.
Presetting is synchronous and occurs on the rising edge of the clock.
The clear function is asynchronous.
The minimum recommended operating voltage is 2V.