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74AHC257; 74AHCT257

Selection guide

Datasheet

74AHC257; 74AHCT257
(Product Specification)
09-May-08, 16 pages, 92 kB

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74AHC257; 74AHCT257 - Quad 2-input multiplexer; 3-state

General description
Features
Products/packages
Quality/reliability/chemical content
Pricing/ordering/availability
Samples
Discontinued information
Applications
Block diagrams/pinning
Design support
Parametrics/similar products
Print/email
Disclaimers
All information hereunder is subject to the subsequent disclaimers

General description

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:

  • 1Y = OE x (1I1 x S + 1I0 x S)
  • 2Y = OE x (2I1 x S + 2I0 x S)
  • 3Y = OE x (3I1 x S + 3I0 x S)
  • 4Y = OE x (4I1 x S + 4I0 x S)

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

Features

  • Balanced propagation delays
  • All inputs have Schmitt-trigger actions
  • Non-inverting data path
  • Inputs accept voltages higher than VCC
  • Input levels:
    • For 74AHC257: CMOS level
    • For 74AHCT257: TTL level
  • ESD protection:
    • HBM EIA/JESD22-A114E exceeds 2000 V
    • MM EIA/JESD22-A115-A exceeds 200 V
    • CDM EIA/JESD22-C101C exceeds 1000 V
  • Multiple package options
  • Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel

Products/packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
74AHC257D74AHC257D,1129352 654 67112Volume productionSOT109TubeStandard Marking
74AHC257D74AHC257D,1189352 654 67118Volume productionSOT109Reel Pack, SMD, 13"Standard Marking
74AHC257PW74AHC257PW,1129352 654 68112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking
74AHC257PW74AHC257PW,1189352 654 68118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking
74AHCT257D74AHCT257D,1129352 654 69112Volume productionSOT109TubeStandard Marking
74AHCT257D74AHCT257D,1189352 654 69118Volume productionSOT109Reel Pack, SMD, 13"Standard Marking
74AHCT257PW74AHCT257PW,1129352 654 70112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking
74AHCT257PW74AHCT257PW,1189352 654 70118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking

Quality/reliability/chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree Conversion dateRHFIRF (FIT)MTBF (hours)MSL
74AHC257D74AHC257D,11274AHC257D
week 35, 2004 6,621,51E+081
74AHC257D74AHC257D,11874AHC257D
week 35, 2004 6,621,51E+081
74AHC257PW74AHC257PW,11274AHC257PW
week 10, 2005 6,621,51E+081
74AHC257PW74AHC257PW,11874AHC257PW
week 10, 2005 6,621,51E+081
74AHCT257D74AHCT257D,11274AHCT257D
week 35, 2004 6,621,51E+081
74AHCT257D74AHCT257D,11874AHCT257D
week 35, 2004 6,621,51E+081
74AHCT257PW74AHCT257PW,11274AHCT257PW
week 10, 2005 6,621,51E+081
74AHCT257PW74AHCT257PW,11874AHCT257PW
week 10, 2005 6,621,51E+081

Quality and reliability disclaimer

Pricing/ordering/availability

Type numberOrdering code(12NC)Orderable part numberIndicative price/unit($)RegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
74AHC257D9352 654 67112  74AHC257D,112  0.2600      not available
74AHC257D9352 654 67118  74AHC257D,118  0.2600      not available
74AHC257PW9352 654 68112  74AHC257PW,112  0.2600      not available
74AHC257PW9352 654 68118  74AHC257PW,118  0.2600      not available
74AHCT257D9352 654 69112  74AHCT257D,112  0.2500      not available
74AHCT257D9352 654 69118  74AHCT257D,118  0.2500      not available
74AHCT257PW9352 654 70112  74AHCT257PW,112  0.2500      not available
74AHCT257PW9352 654 70118  74AHCT257PW,118  0.2500      not available

Block diagrams/pinning

Parametrics/similar products

Type numberPackageDescriptionPropagation Delay(ns)VoltageNo. of PinsPower Dissipation ConsiderationsLogic Switching LevelsOutput Drive Capability
74AHC257DSOT109
Quad 2-Input MUX2.9@5V2.0-5.5 V16Low Power or Battery ApplicationsCMOS+/- 8 mA
74AHC257PWSOT403-1
(TSSOP16)
Quad 2-Input MUX2.9@5V2.0-5.5 V16Low Power or Battery ApplicationsCMOS+/- 8 mA
74AHCT257DSOT109
Quad 2-Input Multiplexer; TTL Enabled (3-State)3.74.5-5.5 V16Low PowerTTL+/- 8 mA
74AHCT257PWSOT403-1
(TSSOP16)
Quad 2-Input Multiplexer; TTL Enabled (3-State)3.74.5-5.5 V16Low PowerTTL+/- 8 mA


Similar products
74AHC257; 74AHCT257 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.