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74AHC(T)257: Quad 2-input multiplexer; 3-state (Based on PIP 74AHC_AHCT257)

The 74AHC257; 74AHCT257 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard No. 7-A.

The 74AHC257; 74AHCT257 has four identical 2-input multiplexers with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S). The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data inputs from source 1 (1I1 to 4I1) are selected when input S is HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs. The 74AHC257; 74AHCT257 is the logic implementation of a 4-pole 2-position switch, where the position of the switch is determined by the logic levels applied to input S. The outputs are forced to a high-impedance OFF-state when OE is HIGH.

The logic equations for the outputs are:

The 74AHC257; 74AHCT257 is identical to the 74AHC258; 74AHCT258, but has non-inverting (true) outputs.

74AHC_T_257: Product Block Diagram

Outline 3d SOT403-1

Data Sheets (1)

Application Notes (5)

Brochures (2)

Selector Guides (2)

Package Information (2)

Packing (2)

Supporting Information (3)

IBIS Model

• ahc257 IBIS model (REV 1.0) ibs AHC257 4/7/2013
• ahct257 IBIS model (REV 1.0) ibs AHCT257 4/7/2013

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
74AHCT257PW		SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	74AHCT257PW,118 (9352 654 70118)	AHCT257	74AHCT257PW		week 10, 2005	84.9	6.62	1.51E8	1	1
				Bulk Pack	Active	74AHCT257PW,112 (9352 654 70112)	AHCT257	74AHCT257PW		week 10, 2005	84.9	6.62	1.51E8	1	1
74AHC257PW		SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	74AHC257PW,118 (9352 654 68118)	AHC257	74AHC257PW		week 10, 2005	84.9	6.62	1.51E8	1	1
				Bulk Pack	Active	74AHC257PW,112 (9352 654 68112)	AHC257	74AHC257PW		week 10, 2005	84.9	6.62	1.51E8	1	1
74AHCT257D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	74AHCT257D,118 (9352 654 69118)	74AHCT257D	74AHCT257D		week 35, 2004	84.9	6.62	1.51E8	1	1
				Bulk Pack	Active	74AHCT257D,112 (9352 654 69112)	74AHCT257D	74AHCT257D		week 35, 2004	84.9	6.62	1.51E8	1	1
74AHC257D		SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	74AHC257D,118 (9352 654 67118)	74AHC257D	74AHC257D		week 35, 2004	84.9	6.62	1.51E8	1	1
				Bulk Pack	Active	74AHC257D,112 (9352 654 67112)	74AHC257D	74AHC257D		week 35, 2004	84.9	6.62	1.51E8	1	1