74HC257DB

Quad 2-input multiplexer; 3-state


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The 74HC257; 74HCT257 are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL).

The 74HC257 and 74HCT257 have 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 S is HIGH. Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.

The 74HC257 and 74HCT257 are the logic implementation of a 4-pole, 2-position switch, where the position of the switch is determined by the logic levels applied to S. The outputs are forced to a high-impedance OFF-state when OE is HIGH.

The logic equations for the outputs are:

1Y = OE • (1I1 • S • 1I0 • S)

2Y = OE • (2I1 • S • 2I0 • S)

3Y = OE • (3I1 • S • 3I0 • S)

4Y = OE • (4I1 • S • 4I0 • S)

Except for their non-inverting (true) outputs the 74HC257; 74HCT257 are identical to the 74HC258.

Features and benefits

  • Non-inverting data path
  • 3-state outputs interface directly with system bus
  • Complies with JEDEC standard no. 7A
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C
All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: 74HC257D, 74HC257DB, 74HC257N, 74HC257PW, 74HCT257D, 74HCT257DB, 74HCT257N, 74HCT257PW
Block diagram: 74HC257D, 74HC257DB, 74HC257N, 74HC257PW, 74HCT257D, 74HCT257DB, 74HCT257N, 74HCT257PW

Parametrics of this product

Type numberPackageNr of pinsPackage nameProduct statustpd(ns)VCC(V)FamilyPower dissipation considerationsLogic switching levelsOutput drive capability(mA)DescriptionTamb(Cel)
74HC257DBSOT338-1
(SSOP16)		16SSOP16Production112.0 - 6.0HC(T)lowCMOS+/- 7.8quad 2-input multiplexer (3-State)-40~125

Package

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
74HC257DB74HC257DB,1129351 886 60112Volume productionSOT338-1
(SSOP16) 		TubeHC257
74HC257DB74HC257DB,1189351 886 60118Volume productionSOT338-1
(SSOP16) 		Reel Pack, SMD, 13"HC257

Outline drawing

Package VersionPackage NamePackage DescriptionReference CodesIssue Date
SOT338-1SSOP16plastic shrink small outline package; 16 leads; body width 5.3 mmMO-150 (JEDEC); 2003-02-19

Related documents

Reflow soldering

Wave soldering

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
74HC257DB74HC257DB,11274HC257DBweek 12, 20056.621.5105740181268883E811
74HC257DB74HC257DB,11874HC257DBweek 12, 20056.621.5105740181268883E811
Quality and reliability disclaimer

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Documentation for this product

File nameTitleTypeFormatDate
74HC_HCT257Quad 2-input multiplexer; 3-stateData sheetpdf2010-01-13
AN11044Pin FMEA 74HC/74HCT familyApplication notepdf2011-03-16
AN252Live Insertion Aspects of Philips Logic FamiliesApplication notepdf2013-03-13
HCT_USER_GUIDEHC/T User GuideUser manualpdf1997-11-01

Ordering & availability

Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
74HC257DB9351 886 6011274HC257DB,112      not available
74HC257DB9351 886 6011874HC257DB,118      not available

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