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74AHCT157BQ

Quad 2-input multiplexer

The 74AHC/AHCT157 are high-speed Si-gate CMOS devices and are pin compatible with Low Power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74AHC/AHCT157 are quad 2-input multiplexer which select 4 bits of data from two sources under the control of a common data select input (S). The enable input (E) is active LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of all other input conditions.

Moving the data from two groups of registers to four common output buses is a common use of the 74AHC/AHCT157. The state of the common data select input (S) determines the particular register from which the data comes. It can also be used as function generator. The device is useful for implementing highly irregular logic by generating any four of the 16 different functions of two variables with one variable common. The 74AHC/AHCT157 is logic implementation of a 4-pole, 2-position switch, where the position of the switch is determine by the logic levels applied to S.

The logic equations are:

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

The 74AHC/AHCT157 is identical to the 74AHC/AHCT158 but has non-inverting (true) outputs.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74AHCT157BQ 74AHCT157BQ,115 935285571115 SOT763-1 Order product

Features and benefits

  • Balanced propagation delays
  • All inputs have a Schmitt-trigger action
  • Inputs accepts voltages higher than VCC
  • Multiple input enable for easy expansion
  • Ideal for memory chip select decoding
  • For 74AHC157 only: operates with CMOS input levels
  • For 74AHCT157 only: operates with TTL input levels
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
    • CDM JESD22-C101C exceeds 1000 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Applications

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74AHCT157BQProduction4.5 - 5.5TTL± 83.2low-40~1259112.760DHVQFN16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
74AHCT157BQ74AHCT157BQ,115
( 9352 855 71115 )
ActiveAHT157
DHVQFN16
(SOT763-1)
SOT763-1Reel 7” Q1/T1 or Q2/T3

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74AHCT157BQ74AHCT157BQ,11574AHCT157BQ84.96.621.51E811
Quality and reliability disclaimer

Documentation (3)

File nameTitleTypeDate
74AHC_AHCT157Quad 2-input multiplexerData sheet2017-05-10
AN11106Pin FMEA for AHC/AHCT familyApplication note2019-01-09
ahct157ahct157 IBIS modelIBIS model2013-04-07

Support

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Models

File nameTitleTypeDate
ahct157ahct157 IBIS modelIBIS model2013-04-07

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74AHCT157BQ74AHCT157BQ,115935285571115Reel 7” Q1/T1 or Q2/T3Order product

Sample

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