Datasheet Texas Instruments SN74LS257B

Manufacturer	Texas Instruments
Series	SN74LS257B

Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs

Datasheets

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PDF, 989 Kb, File published: Mar 1, 1988

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Status

	SN74LS257BD	SN74LS257BDE4	SN74LS257BDG4	SN74LS257BDR	SN74LS257BN	SN74LS257BN3	SN74LS257BNE4	SN74LS257BNSR
Lifecycle Status	Active (Recommended for new designs)	Active (Recommended for new designs)	Active (Recommended for new designs)	Active (Recommended for new designs)	Active (Recommended for new designs)	Obsolete (Manufacturer has discontinued the production of the device)	Active (Recommended for new designs)	Active (Recommended for new designs)
Manufacture's Sample Availability	No	No	No	No	No	No	No	No

Packaging

	SN74LS257BD	SN74LS257BDE4	SN74LS257BDG4	SN74LS257BDR	SN74LS257BN	SN74LS257BN3	SN74LS257BNE4	SN74LS257BNSR
N	1	2	3	4	5	6	7	8
Pin	16	16	16	16	16	16	16	16
Package Type	D	D	D	D	N	N	N	NS
Industry STD Term	SOIC	SOIC	SOIC	SOIC	PDIP	PDIP	PDIP	SOP
JEDEC Code	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDIP-T	R-PDIP-T	R-PDIP-T	R-PDSO-G
Package QTY	40	40	40	2500	25		25	2000
Carrier	TUBE	TUBE	TUBE	LARGE T&R	TUBE		TUBE	LARGE T&R
Device Marking	LS257B	LS257B	LS257B	LS257B	SN74LS257BN		SN74LS257BN	74LS257B
Width (mm)	3.91	3.91	3.91	3.91	6.35	6.35	6.35	5.3
Length (mm)	9.9	9.9	9.9	9.9	19.3	19.3	19.3	10.3
Thickness (mm)	1.58	1.58	1.58	1.58	3.9	3.9	3.9	1.95
Pitch (mm)	1.27	1.27	1.27	1.27	2.54	2.54	2.54	1.27
Max Height (mm)	1.75	1.75	1.75	1.75	5.08	5.08	5.08	2
Mechanical Data	Download	Download	Download	Download	Download	Download	Download	Download

Parametrics

Parameters / Models	SN74LS257BD	SN74LS257BDE4	SN74LS257BDG4	SN74LS257BDR	SN74LS257BN	SN74LS257BN3	SN74LS257BNE4	SN74LS257BNSR
Approx. Price (US$)						0.28 \| 1ku
Bandwidth, MHz	35	35	35	35	35		35	35
Bits	2	2	2	2	2		2	2
Bits(#)						2
Number of Channels	4	4	4	4	4		4	4
Channels(#)						4
Configuration	2:1	2:1	2:1	2:1	2:1	2:1	2:1	2:1
Digital input leakage(Max), uA	5	5	5	5	5		5	5
ESD Charged Device Model, kV	0.75	0.75	0.75	0.75	0.75		0.75	0.75
ESD HBM, kV	2	2	2	2	2		2	2
F @ Nom Voltage(Max), Mhz	35	35	35	35	35		35	35
F @ Nom Voltage(Max)(Mhz)						35
Function	Encoder/Multiplexer	Encoder/Multiplexer	Encoder/Multiplexer	Encoder/Multiplexer	Encoder/Multiplexer	Encoder/Multiplexer	Encoder/Multiplexer	Encoder/Multiplexer
ICC @ Nom Voltage(Max), mA	19	19	19	19	19		19	19
ICC @ Nom Voltage(Max)(mA)						19
Input Type						TTL
Operating Temperature Range, C	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70		0 to 70	0 to 70
Operating Temperature Range(C)						0 to 70
Output Drive (IOL/IOH)(Max), mA	24/-2.6	24/-2.6	24/-2.6	24/-2.6	24/-2.6		24/-2.6	24/-2.6
Output Drive (IOL/IOH)(Max)(mA)						24/-2.6
Output Type						TTL
Package Group	SOIC	SOIC	SOIC	SOIC	PDIP	PDIP	PDIP	SO
Package Size: mm2:W x L, PKG	16SOIC: 59 mm2: 6 x 9.9(SOIC)	16SOIC: 59 mm2: 6 x 9.9(SOIC)	16SOIC: 59 mm2: 6 x 9.9(SOIC)	16SOIC: 59 mm2: 6 x 9.9(SOIC)	See datasheet (PDIP)		See datasheet (PDIP)	16SO: 80 mm2: 7.8 x 10.2(SO)
Package Size: mm2:W x L (PKG)						See datasheet (PDIP)
Rating	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
Schmitt Trigger	No	No	No	No	No	No	No	No
Technology Family	LS	LS	LS	LS	LS	LS	LS	LS
Type	3-State Output	3-State Output	3-State Output	3-State Output	3-State Output	3-State Output	3-State Output	3-State Output
VCC(Max), V	5.25	5.25	5.25	5.25	5.25		5.25	5.25
VCC(Max)(V)						5.25
VCC(Min), V	4.75	4.75	4.75	4.75	4.75		4.75	4.75
VCC(Min)(V)						4.75
Voltage(Nom), V	5	5	5	5	5		5	5
Voltage(Nom)(V)						5
tpd @ Nom Voltage(Max), ns	21	21	21	21	21		21	21
tpd @ Nom Voltage(Max)(ns)						21

Eco Plan

	SN74LS257BD	SN74LS257BDE4	SN74LS257BDG4	SN74LS257BDR	SN74LS257BN	SN74LS257BN3	SN74LS257BNE4	SN74LS257BNSR
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Not Compliant	Compliant	Compliant
Pb Free	Yes	No	Yes

Application Notes

Download
Designing with the SN54/74LS123 (Rev. A)
PDF, 118 Kb, Revision: A, File published: Mar 1, 1997
The Texas Instruments (TI) SN54/74LS123 dual retriggerable monostable multivibrator is a one-shot device capable of verylong output pulses and up to 100% duty cycle. The ?LS123 also features dc triggering from gated low-level active A andhigh-level active B inputs and provides a clear input that terminates the output pulse of any predetermined time independentof timing components R ext and

Model Line

Series: SN74LS257B (8)

SN74LS257BD SN74LS257BDE4 SN74LS257BDG4 SN74LS257BDR SN74LS257BN SN74LS257BN3 SN74LS257BNE4 SN74LS257BNSR

Manufacturer's Classification

Semiconductors> Switches and Multiplexers> Buffered Encoders and Decoders