Mini Din Male Solder 8 Pin Connector

The 74HC161 is a synchronous presettable binary counter with an internal look-ahead carry.

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 counte may be preset HIGH or LOW.

A LOW 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. Preset

takes place regardless of the levels at count enable inputs (CEP and CET). A LOW at the master reset input (MR) sets Q0 to Q3 LOW regardless of the levels at input pins CP, PE, CET and CEP

(thus providing an asynchronous clear function).

The look-ahead carry simplifies serial cascading of the counte. Both 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 output of Q0. This pulse can be used to enable the next cascaded stage. The maximum clock frequency for the cascaded counte is determined by the CP to TC propagation delay and CEP to CP set-up time.

Inputs include clamp diodes. This enables the use of current limiting resisto to interface inputs to voltages in excess of VCC.

Features:

Complies with JEDEC standard no. 7A
CMOS input levels
Synchronous counting and loading
Two count enable inputs for n-bit cascading
Asynchronous reset
Positive-edge triggered clock
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from -40 °C to +85 °C and -40 °C to +125 °C

Applications:

Presettable synchronous 4 bit binary counter

DataSheet:

74HC161 Datasheet

Package Includes:

1 x 74hc161 IC