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74HC160NPHN/a26avaiPresettable synchronous BCD decade counter; asynchronous reset


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74HC160N
Presettable synchronous BCD decade counter; asynchronous reset

Philips Semiconductors Product specification
Presettable synchronous BCD decade
counter; asynchronous reset 74HC/HCT160
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

The 74HC/HCT160 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. 7A.
The 74HC/HCT160 are synchronous presettable decade
counters which feature an internal look-ahead 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 (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. Both count enable inputs (CEP and CET) must
be HIGH to count. The CET input is fed forward to enable
the terminal count output (TC). The TC output thus
enabled will produce a HIGH output pulse of a duration
approximately equal to a HIGH level output of Q0. This
pulse can be used to enable the next cascaded stage.
The maximum clock frequency for the cascaded counters
is determined by the CP to TC propagation delay and CEP
to CP set-up time, according to the following formula:
fmax= 1P max() CPto TC() +tSU (CEPto CP)---------------------------------------------------------------------------------------------------------
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
VCC= supply voltage in V For HC the condition is= GND to VCC
For HCT the condition is= GND to VCC − 1.5 V
Philips Semiconductors Product specification
Presettable synchronous BCD decade
counter; asynchronous reset 74HC/HCT160
ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.
PIN DESCRIPTION
Philips Semiconductors Product specification
Presettable synchronous BCD decade
counter; asynchronous reset 74HC/HCT160
FUNCTION TABLE
Notes
The TC output is HIGH when CET is HIGH and the counter is at terminal count (HLLH).= HIGH voltage level= HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition= LOW voltage level= LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition= lower case letters indicate the state of the referenced output one set-up time prior to the LOW-to-HIGH CP
transition= don’t care= LOW-to-HIGH CP transition
Philips Semiconductors Product specification
Presettable synchronous BCD decade
counter; asynchronous reset 74HC/HCT160
Philips Semiconductors Product specification
Presettable synchronous BCD decade
counter; asynchronous reset 74HC/HCT160
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
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