4-bit binary counter
INTEGRATED CIRCUITS
74F160A*, 74F161A, 74F162A*, 74F163A 4-bit binary counter
* Discontinued part. Please see the Disco...
Description
INTEGRATED CIRCUITS
74F160A*, 74F161A, 74F162A*, 74F163A 4-bit binary counter
* Discontinued part. Please see the Discontinued Product List in Section 1, page 21.
Product specification IC15 Data Handbook
1996 Jan 29
Philips Semiconductors
Philips Semiconductors
Product specification
4-bit binary counters
74F161A, 74F163A
FEATURES
Synchronous counting and loading Two count enable inputs for n-bit cascading Positive edge-triggered clock Asynchronous Master Reset (74F161A) Synchronous Reset (74F163A) High speed synchronous expansion Typical count rate of 130MHz Industrial range (–40°C to +85°C) available
DESCRIPTION
4-bit binary counters feature an internal carry look-ahead and can be used for high-speed counting. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock. The clock input is buffered. The outputs of the counters may be preset to High or Low level. A Low level at the Parallel Enable (PE) input disables the counting action and causes the data at the D0–D3 inputs to be loaded into the counter on the positive-going edge of the clock (provided that the setup and hold requirements for PE are met). Preset takes place regardless of the levels at Count Enable (CEP, CET) inputs.
A Low level at the Master Reset (MR) input sets all the four outputs of the flip-flops (Q0 – Q3) in 74F161A to Low levels, regardless of the levels at CP, PE, CET and CEP inputs (thus providing an asynchronou...
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