74HC160 IC - (SMD Package) - Presettable synchronous BCD decade counter IC (74160)

The 74HC160 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 74HC160 are synchronous preset table 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 = 1 /t P (max) (CP to TC) + tSU (CEP to CP)

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

Specification:-

Symbol	Parameter	Value	Unit
Tphl	Propagation Delay
	CP to Qn	19	ns
	CP to TC	21	ns
	MR to Qn	21	ns
	MR to TC	21	ns
	CET to TC	14	ns
tPLH	Propagation Delay
	CP to Qn	19	ns
	CP to TC	21	ns
	CET to TC	14	ns
fmax	Maximum Clock Frequency	61	MHz
CI	Input Capacitance	3.5	pF
CPD	Power Dissipation Capacitance per Package	39	pF

Related Document:-

74HC160 SMD Data Sheet