SN74AHC123A Status: ACTIVE

Dual Retriggerable Monostable Multivibrators

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Datasheet

SN54AHC123A, SN74AHC123A (Rev. H) (PDF 881 KB)
21 Oct 2005

	SN54AHC123A	SN74AHC123A
Voltage Nodes(V)	5, 3.3	5, 3.3
Vcc range(V)	2 to 5.5	2 to 5.5
Rating	Military	Catalog
Technology Family	AHC	AHC
	Samples	Samples
	Inventory	Inventory

Other qualified versions of SN74AHC123A

Version	Part Number	Definition
Enhanced Product	SN74AHC123A-EP	Supports Defense, Aerospace and Medical Applications
Military	SN54AHC123A	QML certified for Military and Defense Applications

Customers Who Evaluated This Product Also Evaluated

CD74HC123: High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset
SN74LVC1G14: Single Schmitt-Trigger Inverter

Product Information

Features

Operating Range 2-V to 5.5-V V_CC
Schmitt-Trigger Circuitry On A\, B, and CLR\ Inputs for Slow Input Transition Rates
Edge Triggered From Active-High or Active-Low Gated Logic Inputs
Retriggerable for Very Long Output Pulses
Overriding Clear Terminates Output Pulse
Glitch-Free Power-Up Reset On Outputs
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

Description

The ’AHC123A devices are dual retriggerable monostable multivibrators designed for 2-V to 5.5-V V_CC operation.

These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A\ input is low, and the B input goes high. In the second method, the B input is high, and the A\ input goes low. In the third method, the A\ input is low, the B input is high, and the clear (CLR)\ input goes high.

The output pulse duration is programmed by selecting external resistance and capacitance values. The external timing capacitor must be connected between C_ext and R_ext/C_ext (positive) and an external resistor connected between R_ext/C_ext and V_CC. To obtain variable pulse durations, connect an external variable resistance between R_ext/C_ext and V_CC. The output pulse duration also can be reduced by taking CLR\ low.

Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. The A\, B, and CLR\ inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition rates with jitter-free triggering at the outputs.

Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A\) or high-level-active (B) input. Pulse duration can be reduced by taking CLR\ low. CLR\ input can be used to override A\ or B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early clearing.

The variance in output pulse duration from device to device typically is less than ±0.5% for given external timing components. An example of this distribution for the ’AHC123A is shown in Figure 10. Variations in output pulse duration versus supply voltage and temperature are shown in Figure 6.

During power up, Q outputs are in the low state, and Q\ outputs are in the high state. The outputs are glitch free, without applying a reset pulse.

For additional application information on multivibrators, see the application report Designing With the SN74AHC123A and SN74AHCT123A, literature number SCLA014.

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
SN74AHC123AD	ACTIVE	-40 to 85	0.22 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74AHC123ADBR	ACTIVE	-40 to 85	0.24 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADBRE4	ACTIVE	-40 to 85	0.24 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADBRG4	ACTIVE	-40 to 85	0.24 \| 1ku	SSOP (DB) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADE4	ACTIVE	-40 to 85	0.22 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74AHC123ADG4	ACTIVE	-40 to 85	0.22 \| 1ku	SOIC (D) \| 16	View	40 \| TUBE	Purchase Samples
SN74AHC123ADGVR	ACTIVE	-40 to 85	0.26 \| 1ku	TVSOP (DGV) \| 16		2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADGVRE4	ACTIVE	-40 to 85	0.26 \| 1ku	TVSOP (DGV) \| 16		2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADGVRG4	ACTIVE	-40 to 85	0.26 \| 1ku	TVSOP (DGV) \| 16		2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADR	ACTIVE	-40 to 85	0.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADRE4	ACTIVE	-40 to 85	0.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123ADRG4	ACTIVE	-40 to 85	0.20 \| 1ku	SOIC (D) \| 16	View	2500 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123AN	ACTIVE	-40 to 85	0.22 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples
SN74AHC123ANE4	ACTIVE	-40 to 85	0.22 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE	Purchase Samples
SN74AHC123APWR	ACTIVE	-40 to 85	0.22 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123APWRE4	ACTIVE	-40 to 85	0.22 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office
SN74AHC123APWRG4	ACTIVE	-40 to 85	0.22 \| 1ku	TSSOP (PW) \| 16	View	2000 \| LARGE T&R	Contact TI Distributor or Sales Office

* 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 11:07 AM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 15 WeeksSN74AHC123AD
Americas	Arrow	>1k
	Avnet	>1k
	Rochester Electronics	368
Asia	WPI	3
Europe	Avnet-SILICA	80
Europe	EBV Elektronik	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksSN74AHC123ADBR
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksSN74AHC123ADBRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74AHC123ADBRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74AHC123ADE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74AHC123ADG4
Worldwide	DigiKey	Available
TI Lead Time*: 12 WeeksSN74AHC123ADGVR
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 12 WeeksSN74AHC123ADGVRE4
Worldwide	DigiKey	Available
TI Lead Time*: 12 WeeksSN74AHC123ADGVRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74AHC123ADR
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	62
TI Lead Time*: 15 WeeksSN74AHC123ADRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksSN74AHC123ADRG4
Worldwide	DigiKey	Available
TI Lead Time*: 14 WeeksSN74AHC123AN
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	782
Europe	Farnell	782
Worldwide	Mouser Electronics	870
TI Lead Time*: 14 WeeksSN74AHC123ANE4
None Reported View Distributors
TI Lead Time*: 19 WeeksSN74AHC123APWR
None Reported View Distributors
TI Lead Time*: 19 WeeksSN74AHC123APWRE4
None Reported View Distributors
TI Lead Time*: 19 WeeksSN74AHC123APWRG4
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
SN74AHC123AD	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADBRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADGVRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADGVRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123ADRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123AN	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
SN74AHC123ANE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
SN74AHC123APWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123APWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
SN74AHC123APWRG4	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 SN74AHC123A

Datasheet

SN54AHC123A, SN74AHC123A (Rev. H) (PDF, 881 KB)
21 Oct 2005

Application Notes

Live Insertion (HTM, 8 KB) 2410 views
01 Oct 1996 Read Abstract
TI IBIS File Creation, Validation, and Distribution Processes (HTM, 9 KB) 3849 views
29 Aug 2002 Read Abstract
Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 26969 views
24 May 2004 Read Abstract
Selecting the Right Level Translation Solution (Rev. A) (HTM, 8 KB) 15418 views
22 Jun 2004 Read Abstract
Designing With the SN74AHC123A and SN74AHCT123A (HTM, 8 KB) 1281 views
01 Oct 1999 Read Abstract
Understanding and Interpreting Standard-Logic Data Sheets (Rev. B) (HTM, 8 KB) 21380 views
28 May 2003 Read Abstract
Implications of Slow or Floating CMOS Inputs (Rev. C) (HTM, 8 KB) 7013 views
01 Feb 1998 Read Abstract
Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (Rev. A) (HTM, 8 KB) 2402 views
01 Aug 1997 Read Abstract
Benefits & Issues of Migrating 5-V and 3.3-V Logic to Lower-Voltage Supplies (Rev. A) (HTM, 9 KB) 704 views
08 Sep 1999 Read Abstract
Migration From 3.3-V To 2.5-V Power Supplies For Logic Devices (HTM, 9 KB) 633 views
01 Dec 1997 Read Abstract
Advanced High-Speed CMOS (AHC) Logic Family (Rev. C) (HTM, 9 KB) 1892 views
02 Dec 2002 Read Abstract
Texas Instruments Little Logic Application Report (HTM, 8 KB) 2341 views
01 Nov 2002 Read Abstract
CMOS Power Consumption and CPD Calculation (Rev. B) (HTM, 9 KB) 3135 views
01 Jun 1997 Read Abstract

View Application Notes for Monostable Multivibrators

User Guides

LOGIC Pocket Data Book (Rev. B) (PDF, 6001 KB) 46833 views
16 Jan 2007

Selection Guides

Logic Guide 2009 (Rev. Z) (PDF, 4263 KB) 88618 views
23 Jul 2009

More Literature

Logic Cross-Reference (Rev. A) (PDF, 2938 KB) 15250 views
07 Oct 2003
Design Summary for WCSP Little Logic (Rev. B) (PDF, 295 KB) 1806 views
04 Nov 2004
Military Advanced High-Speed CMOS Logic (AHC/AHCT) (Rev. C) (PDF, 30 KB) 634 views
01 Apr 1998
Military Advanced High-Speed CMOS Logic (AHC/AHCT) (PDF, 85 KB) 781 views
01 Apr 1998
AHC/AHCT Designer's Guide February 2000 (Rev. D) (HTM, 8 KB) 1478 views
24 Feb 2000 Read Abstract

Reference Designs

Description	Part #	Company
Industrial Control via the CAN Bus Demonstration Platform	CANBUS-DEMO	Texas Instruments

Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
CD74HC123	High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset	SPECIALTY LOGIC-MONOSTABLE MULTIVIBRATORS	TI customers also evaluated this product.
SN74LVC1G14	Single Schmitt-Trigger Inverter	LITTLE LOGIC-LL BUFFER, DRIVER AND TRANSCEIVER	TI customers also evaluated this product.

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SN74AHC123A Status: ACTIVE

Dual Retriggerable Monostable Multivibrators

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