74HC4520N datasheet(2/7 Pages) NXP

Il numero della parte	74HC4520N

Spiegazioni elettronici	Dual 4-bit synchronous binary counter

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December 1990

2

Philips Semiconductors

Product speciﬁcation

Dual 4-bit synchronous binary counter

74HC/HCT4520

FEATURES

• Output capability: standard

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT4520 are high-speed Si-gate CMOS

devices and are pin compatible with the “4520” of the

“4000B” series. They are specified in compliance with

JEDEC standard no. 7A.

The 74HC/HCT4520 are dual 4-bit internally synchronous

binary counters with an active HIGH clock input (nCP0)

and an active LOW clock input (nCP1), buffered outputs

from all four bit positions (nQ0 to nQ3) and an active HIGH

overriding asynchronous master reset input (nMR).

The counter advances on either the LOW-to-HIGH

transition of nCP0 if nCP1 is HIGH or the HIGH-to-LOW

transition of nCP1 if nCP0 is LOW. Either nCP0 or nCP1

may be used as the clock input to the counter and the other

clock input may be used as a clock enable input. A HIGH

on nMR resets the counter (nQ0 to nQ3 = LOW)

independent of nCP0 and nCP1.

APPLICATIONS

• Multistage synchronous counting

• Multistage asynchronous counting

• Frequency dividers

QUICK REFERENCE DATA

GND = 0 V; Tamb =25 °C; tr =tf = 6 ns

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW):

PD =CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

∑ (CL × VCC2 × fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V

ORDERING INFORMATION

See

“74HC/HCT/HCU/HCMOS Logic Package Information”.

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HC

HCT

tPHL/ tPLH

propagation delay nCP0, nCP1 to nQn

CL = 15 pF; VCC = 5 V 2424ns

tPHL

propagation delay nMR to nQn

13

ns

fmax

maximum clock frequency

68

64

MHz

CI

input capacitance

3.5

pF

CPD

power dissipation capacitance per counter

notes 1 and 2

29

24

pF

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