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74HC160: Presettable synchronous BCD decade counter; asynchronous reset

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= (1) / (tP (max)( CP to TC) + tSU(CEP to CP) )

Outline 3d SOT338-1

应用说明 (2)

用户指南 (1)

封装信息 (2)

支持信息 (4)

订购信息

封装环保信息

产品编号	封装说明	Outline Version	回流/波峰焊接	包装	产品状态	部件编号订购码 (12NC)	Marking	化学成分	RoHS / 无铅 / RHF	无铅转换日期	EFR	IFR(FIT)	MTBF（小时）	MSL	MSL LF
74HC160DB		SOT338-1	SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	74HC160DB,118 (9351 896 80118)	HC160	74HC160DB		week 17, 2005	84.9	6.62	1.51E8	1	1
				Bulk Pack	Active	74HC160DB,112 (9351 896 80112)	HC160	74HC160DB		week 17, 2005	84.9	6.62	1.51E8	1	1
74HC160D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1 CECC	Active	74HC160D,653 (9337 145 10653)	74HC160D	74HC160D		week 4, 2004	84.9	6.62	1.51E8	1	1
				Bulk Pack, CECC	Active	74HC160D,652 (9337 145 10652)	74HC160D	74HC160D		week 4, 2004	84.9	6.62	1.51E8	1	1