Philips 74HCT161
The 74HC/HCT161 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. The 74HC/HCT161 are synchronous presettable binary counters which feature an internal look-ahead carry and can be used for high-speed counting.| Part No. | 74HCT161 |
|---|---|
| Datasheet | 74HCT161 Download |
| Manufacturer |  Philips |
| Description | Presettable synchronous 4-bit binary counter |
| Buy | Stock & Price |
FEATURES
● Synchronous counting and loading● Two count enable inputs for n-bit cascading
● Positive-edge triggered clock
● Asynchronous reset
● Output capability: standard
● ICC category: MSI
GENERAL DESCRIPTION
7A. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset to a HIGH or LOW level. A LOW level at the parallel enable 74HC/HCT161 input (PE) disables the counting action and causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock (providing that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable inputs (CEP and CET). A LOW level at the master reset input (MR) sets all four outputs of the flip-flops (Q0 to Q3) to LOW level regardless of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronous clear function). The look-ahead carry simplifies serial cascading of the counters.
