SN74HC161 Status: ACTIVE

4-Bit Synchronous Binary Counters

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Datasheet

SN54HC161, SN74HC161 (Rev. D) (PDF 925 KB)
26 Sep 2003

	SN54HC161	SN74HC161
Voltage Nodes(V)	6, 5, 2	6, 5, 2
Vcc range(V)	2.0 to 6.0	2.0 to 6.0
Input Level	CMOS	CMOS
Output Level	CMOS	CMOS
Output Drive(mA)		-4/4
Output	2S	2S
Clear	Async	Async
Rating	Military	Catalog
Technology Family	HC	HC
	Samples	Samples
	Inventory	Inventory

Other qualified versions of SN74HC161

Version	Part Number	Definition
Military	SN54HC161	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

SN74HC393: Dual 4-Bit Binary Counters
SN74HC163: 4-Bit Synchronous Binary Counters
SN74HC04: Hex Inverters
SN74LV4051A: 8-Channel Analog Multiplexer/Demultiplexer
SN74HC14: Hex Schmitt-Trigger Inverters

Product Information

Features

Wide Operating Voltage Range of 2 V to 6 V
Outputs Can Drive Up To 10 LSTTL Loads
Low Power Consumption, 80-µA Max I_CC
Typical t_pd = 14 ns
±4-mA Output Drive at 5 V
Low Input Current of 1 µA Max
Internal Look-Ahead for Fast Counting
Carry Output for n-Bit Cascading
Synchronous Counting
Synchronously Programmable

Description

These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. The ’HC161 devices are 4-bit binary counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with synchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.

These counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15. As presetting is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.

The clear function for the ’HC161 devices is asynchronous. A low level at the clear (CLR)\ input sets all four of the flip-flop outputs low, regardless of the levels of the CLK, load (LOAD)\, or enable inputs.

The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are ENP, ENT, and a ripple-carry output (RCO). Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a high-level pulse while the count is maximum (9 or 15 with Q_A high). This high-level overflow ripple-carry pulse can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the level of CLK.

These counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD\) that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the stable setup and hold times.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools	Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Footprints	Samples
SN74HC161D	ACTIVE	-40 to 85	0.22 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74HC161DBR	OBSOLETE	-40 to 85		SSOP (DB) \| 16	View		Not Available
SN74HC161DE4	ACTIVE	-40 to 85	0.22 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74HC161DG4	ACTIVE	-40 to 85	0.22 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74HC161DR	ACTIVE	-40 to 85	0.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74HC161DRE4	ACTIVE	-40 to 85	0.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74HC161DRG4	ACTIVE	-40 to 85	0.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74HC161DT	ACTIVE	-40 to 85	0.57 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R	Purchase Samples
SN74HC161DTE4	ACTIVE	-40 to 85	0.57 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R	Purchase Samples
SN74HC161DTG4	ACTIVE	-40 to 85	0.57 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R	Purchase Samples
SN74HC161N	ACTIVE	-40 to 85	0.29 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
SN74HC161N3	OBSOLETE	-40 to 85		PDIP (N) \| 16	View		Not Available
SN74HC161NE4	ACTIVE	-40 to 85	0.29 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Contact TI Distributor or Sales Office
SN74HC161NSR	ACTIVE	-40 to 85	0.24 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74HC161NSRE4	ACTIVE	-40 to 85	0.24 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74HC161NSRG4	ACTIVE	-40 to 85	0.24 \| 1ku	SO (NS) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74HC161PW	ACTIVE	-40 to 85	0.20 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
SN74HC161PWE4	ACTIVE	-40 to 85	0.20 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
SN74HC161PWG4	ACTIVE	-40 to 85	0.20 \| 1ku	TSSOP (PW) \| 16	View	90 \| TUBE	Purchase Samples
SN74HC161PWR	ACTIVE	-40 to 85	0.20 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74HC161PWRE4	ACTIVE	-40 to 85	0.20 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74HC161PWRG4	ACTIVE	-40 to 85	0.20 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Purchase Samples
SN74HC161PWT	ACTIVE	-40 to 85	0.57 \| 1ku	TSSOP (PW) \| 16	View	250 \| SMALL T&R	Purchase Samples
SN74HC161PWTE4	ACTIVE	-40 to 85	0.57 \| 1ku	TSSOP (PW) \| 16	View	250 \| SMALL T&R	Purchase Samples
SN74HC161PWTG4	ACTIVE	-40 to 85	0.57 \| 1ku	TSSOP (PW) \| 16	View	250 \| SMALL T&R	Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 10:56 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 15 WeeksSN74HC161D
Americas	Arrow	7
	Avnet	847
	Newark	94
	Rochester Electronics	40
Asia	Farnell Asia	>1k
Asia	WPI	865
Europe	Arrow Southern Europe	440
	Avnet-SILICA	40
	EBV Elektronik	>1k
	Farnell	>1k
	Spoerle	40
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	>1k
Call**SN74HC161DBR
Americas	Rochester Electronics	>1k
TI Lead Time*: 15 WeeksSN74HC161DE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161DG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161DR
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Asia	Wintech	>1k
Europe	Abacus Polar	>1k
	Arrow Northern Europe	>1k
	Compel	>1k
	Spoerle	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksSN74HC161DRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161DRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161DT
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161DTE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161DTG4
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksSN74HC161N
Americas	Arrow	>1k
	Avnet	>1k
	Newark	751
	Rochester Electronics	>1k
Asia	WPI	82
Europe	Avnet-SILICA	50
	EBV Elektronik	>1k
	Spoerle	25
Worldwide	DigiKey	>1k
TI Lead Time*: 18 WeeksSN74HC161NE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74HC161NSR
Americas	Rochester Electronics	>1k
TI Lead Time*: 15 WeeksSN74HC161NSRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksSN74HC161NSRG4
None Reported View Distributors
TI Lead Time*: 18 WeeksSN74HC161PW
Asia	Farnell Asia	740
Europe	Farnell	740
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 18 WeeksSN74HC161PWE4
None Reported View Distributors
TI Lead Time*: 18 WeeksSN74HC161PWG4
None Reported View Distributors
TI Lead Time*: 20 WeeksSN74HC161PWR
Worldwide	Mouser Electronics	541
TI Lead Time*: 20 WeeksSN74HC161PWRE4
None Reported View Distributors
TI Lead Time*: 20 WeeksSN74HC161PWRG4
None Reported View Distributors
TI Lead Time*: 18 WeeksSN74HC161PWT
None Reported View Distributors
TI Lead Time*: 18 WeeksSN74HC161PWTE4
None Reported View Distributors
TI Lead Time*: 18 WeeksSN74HC161PWTG4
None Reported View Distributors
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
SN74HC161D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DTE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161DTG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161N	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
SN74HC161NE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
SN74HC161NSR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161NSRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161NSRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWTE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74HC161PWTG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

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Datasheet

SN54HC161, SN74HC161 (Rev. D) (PDF, 925 KB)
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SN74HC161 Status: ACTIVE

4-Bit Synchronous Binary Counters

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