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74LVC163: Presettable synchronous 4-bit binary counter; synchronous reset (Based on PIP 74LVC163)

The 74LVC163 is a synchronous presettable binary counter which features 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 (pin CP). The outputs (pins Q0 to Q3) of the counters may be preset to a HIGH-level or LOW-level. A LOW-level at the parallel enable input (pin PE) disables the counting action and causes the data at the data inputs (pins D0 to D3) to be loaded into the counter on the positive-going edge of the clock (provided that the set-up and hold time requirements for PE are met). Preset takes place regardless of the levels at count enable inputs (pin CEP and CET). A LOW-level at the master reset input (pin MR) sets all four outputs of the flip-flops (pins Q0 to Q3) to LOW-level after the next positive-going transition on the clock input (pin CP) (provided that the set-up and hold time requirements for PE are met). This action occurs regardless of the levels at input pins PE, CET and CEP. This synchronous reset feature enables the designer to modify the maximum count with only one external NAND gate.

The look-ahead carry simplifies serial cascading of the counters. Both count enable inputs (pin CEP and CET) must be HIGH in count. The CET input is fed forward to enable the terminal count output (pin 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 tPHL (propagation delay CP to TC) and tsu (set-up time CEP to CP) according to the formula: fmax=1/(tPHL(max)+tsu)

74LVC163: Product Block Diagram

Outline 3d SOT338-1

Data Sheets (1)

Application Notes (5)

Selector Guides (2)

Package Information (4)

Packing (3)

Supporting Information (4)

IBIS Model

• lvc163 IBIS model (REV 1.0) ibs LVC163 4/7/2013

SPICE model

• lvc Spice model (REV 1.0) ZIP LVC 5/7/2013

Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
74LVC163BQ		SOT763-1		Reel 7" Q1/T1	Active	74LVC163BQ,115 (9352 756 15115)	LVC163	74LVC163BQ		Always Pb-free	123.8	3.87	2.58E8	1	1
74LVC163D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	74LVC163D,118 (9352 105 40118)	74LVC163D	74LVC163D		Always Pb-free	123.8	3.87	2.58E8	1	1
				Bulk Pack	Active	74LVC163D,112 (9352 105 40112)	74LVC163D	74LVC163D		Always Pb-free	123.8	3.87	2.58E8	1	1
74LVC163DB		SOT338-1	SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	74LVC163DB,118 (9352 105 50118)	LVC163	74LVC163DB		week 12, 2005	123.8	3.87	2.58E8	1	1
				Bulk Pack	Active	74LVC163DB,112 (9352 105 50112)	LVC163	74LVC163DB		week 12, 2005	123.8	3.87	2.58E8	1	1
74LVC163PW		SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	74LVC163PW,118 (9352 105 60118)	LVC163	74LVC163PW		week 10, 2005	123.8	3.87	2.58E8	1	1
				Bulk Pack	Active	74LVC163PW,112 (9352 105 60112)	LVC163	74LVC163PW		week 10, 2005	123.8	3.87	2.58E8	1	1