CD74HC161 Status: ACTIVE

High Speed CMOS Logic 4-Bit Binary Counter with Asynchronous Reset

Harris

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Datasheet

CD54/74HC161, CD54/74HCT161, CD54/74HC163, CD54/74HCT163 (Rev. D) (PDF 573 KB)
13 Oct 2003

	CD54HC161	CD74HC161
Voltage Nodes(V)	6, 5, 2	6, 5, 2
Vcc range(V)		2.0 to 6.0
Input Level		CMOS
Output Level		CMOS
Clear		Async
Rating	Military	Catalog
Technology Family	HC	HC
	Samples	Samples
	Inventory	Inventory

Other qualified versions of CD74HC161

Version	Part Number	Definition
Military	CD54HC161	QML certified for Military and Defense Applications

Product Information

Features

’HC161, ’HCT161 4-Bit Binary Counter, Asynchronous Reset
’HC163, ’HCT163 4-Bit Binary Counter, Synchronous Reset
Synchronous Counting and Loading
Two Count Enable Inputs for n-Bit Cascading
Look-Ahead Carry for High-Speed Counting
Fanout (Over Temperature Range)
- Standard Outputs...10 LSTTL Loads
- Bus Driver Outputs...15 LSTTL Loads
Wide Operating Temperature Range . . . -55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, V_IL = 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l 1µA at V_OL, V_OH

The CD54HCT161 is obsolete and no longer is supplied.
Data sheet acquired from Harris Semiconductor.

Description

The ’HC161, ’HCT161, ’HC163, and ’HCT163 are presettable synchronous counters that feature look-ahead carry logic for use in high-speed counting applications. The ’HC161 and ’HCT161 are asynchronous reset decade and binary counters, respectively; the ’HC163 and ’HCT163 devices are decade and binary counters, respectively, that are reset synchronously with the clock. Counting and parallel presetting are both accomplished synchronously with the negative-to-positive transition of the clock.

A low level on the synchronous parallel enable input, SPE, disables counting operation and allows data at the P0 to P3 inputs to be loaded into the counter (provided that the setup and hold requirements for SPE are met).

All counters are reset with a low level on the Master Reset input, MR. In the ’HC163 and ’HCT163 counters (synchronous reset types), the requirements for setup and hold time with respect to the clock must be met.

Two count enables, PE and TE, in each counter are provided for n-bit cascading. In all counters reset action occurs regardless of the level of the SPE\, PE and TE inputs (and the clock input, CP, in the ’HC161 and ’HCT161 types).

If a decade counter is preset to an illegal state or assumes an illegal state when power is applied, it will return to the normal sequence in one count as shown in state diagram.

The look-ahead carry feature simplifies serial cascading of the counters. Both count enable inputs (PE and TE) must be high to count. The TE input is gated with the Q outputs of all four stages so that at the maximum count the terminal count (TC) output goes high for one clock period. This TC pulse is used to enable the next cascaded stage.

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
CD74HC161E	ACTIVE	-55 to 125	0.40 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples
CD74HC161EE4	ACTIVE	-55 to 125	0.40 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples
CD74HC161M	ACTIVE	-55 to 125	0.40 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
CD74HC161M96	ACTIVE	-55 to 125	0.35 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
CD74HC161M96E4	ACTIVE	-55 to 125	0.35 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
CD74HC161M96G4	ACTIVE	-55 to 125	0.35 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
CD74HC161ME4	ACTIVE	-55 to 125	0.40 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
CD74HC161MG4	ACTIVE	-55 to 125	0.40 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
CD74HC161MT	ACTIVE	-55 to 125	0.68 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R	Purchase Samples
CD74HC161MTE4	ACTIVE	-55 to 125	0.68 \| 1ku	SOIC (D) \| 16	View	250 \| SMALL T&R	Purchase Samples
CD74HC161MTG4	ACTIVE	-55 to 125	0.68 \| 1ku	SOIC (D) \| 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 11:58 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 18 WeeksCD74HC161E
Americas	Arrow	461
	Avnet	>1k
	Rochester Electronics	>1k
Europe	Arrow Southern Europe	575
Europe	EBV Elektronik	400
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 18 WeeksCD74HC161EE4
None Reported View Distributors
TI Lead Time*: 15 WeeksCD74HC161M
Americas	Avnet	>1k
Americas	Rochester Electronics	80
Europe	Arrow Southern Europe	22
	Avnet-SILICA	360
	EBV Elektronik	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksCD74HC161M96
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 15 WeeksCD74HC161M96E4
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksCD74HC161M96G4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksCD74HC161ME4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksCD74HC161MG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksCD74HC161MT
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksCD74HC161MTE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksCD74HC161MTG4
Worldwide	DigiKey	Available
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
CD74HC161E	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
CD74HC161EE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
CD74HC161M	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161M96	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161M96E4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161M96G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161ME4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161MG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161MT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161MTE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
CD74HC161MTG4	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

Most useful technical documents for CD74HC161

Datasheet

CD54/74HC161, CD54/74HCT161, CD54/74HC163, CD54/74HCT163 (Rev. D) (PDF, 573 KB)
13 Oct 2003

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View Application Notes for Binary Counters

User Guides

LOGIC Pocket Data Book (Rev. B) (PDF, 6001 KB) 46833 views
16 Jan 2007
Signal Switch Data Book (Rev. A) (PDF, 18396 KB) 9501 views
14 Nov 2003

Selection Guides

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23 Jul 2009

More Literature

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Support and Community

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CD74HC161 Status: ACTIVE

High Speed CMOS Logic 4-Bit Binary Counter with Asynchronous Reset

Most Popular Links

Datasheet

Other qualified versions of CD74HC161

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

User Guides

Selection Guides

More Literature

Support and Community

Customer Tags

Other Support