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74HC4520D-74HC4520N-74HCT4520D-74HCT4520N
74HC/HCT4520; Dual 4-bit synchronous binary counter

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
CPD is used to determine the dynamic power dissipation (PD in μW): =CPD× VCC2×fi +∑ (CL× VCC2× fo) where:= input frequency in MHz= output frequency in MHz (CL× VCC2×fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V 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”.
Philips Semiconductors Product specification
Dual 4-bit synchronous binary counter 74HC/HCT4520
PIN DESCRIPTION
Philips Semiconductors Product specification
Dual 4-bit synchronous binary counter 74HC/HCT4520
FUNCTION TABLE
Notes
H= HIGH voltage level= LOW voltage level= don’t care= LOW-to-HIGH clock transition= HIGH-to-LOW clock transition
Philips Semiconductors Product specification
Dual 4-bit synchronous binary counter 74HC/HCT4520
DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC

GND= 0 V; tr =tf= 6 ns; CL= 50 pF
Philips Semiconductors Product specification
Dual 4-bit synchronous binary counter 74HC/HCT4520
DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types

The value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT

GND= 0 V; tr =tf= 6 ns; CL= 50 pF
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