Presettable synchronous 4-bit binary counter - Philips
Description
INTEGRATED CIRCUITS
74LVC163 Presettable synchronous 4-bit binary counter; synchronous reset
Product specification Supersedes data of 1996 Aug 23 IC24 Data Handbook 1998 May 20
Philips Semiconductors
Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary counter; synchronous reset
74LVC163
FEATURES
• Wide supply voltage range of 1.
2 V to 3.
6 V • In accordance with JEDEC standard no.
8–1A • Inputs accept voltages up to 5.
5 V • CMOS low power consumption • Direct interface with TTL levels • Synchronous reset • Synchronous counting and loading • Two count enable inputs for n–bit cascading • Positive edge–triggered clock
DESCRIPTION
The 74LVC163 is a high-performance, low-power, low-voltage, Si-gate CMOS device and superior to most advanced CMOS compatible TTL families.
The 74LVC163 is a synchronous presettable binary counter which features an internal look–head carry 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 (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 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 (provided 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 after the next positive-going transition on the clock (CP) input (provided that the set-up and hold time requirements for PE are met).
This action occurs regardless of the levels at CP, PE, CET and CEP inputs This synchronous reset feature enables the designer to modify the maximum count with only one external NAND gate.
The look–ahead carry simplifies serial cascading of the counters...
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