SN54LVC138A, SN74LVC138A

SCAS291V – MARCH 1993 – REVISED JANUARY 2013

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DESCRIPTION/ORDERING INFORMATION

The 'LVC138A devices are designed for high-performance memory-decoding or data-routing applications

requiring very short propagation delay times. In high-performance memory systems, these decoders minimize the

effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, delay times

of these decoders and the enable time of the memory usually are less than the typical access time of the

memory. This means that the effective system delay introduced by the decoders is negligible.

The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two

active-low enable inputs and one active-high enable input reduce the need for external gates or inverters when

expanding. A 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only

one inverter. An enable input can be used as a data input for demultiplexing applications.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators

in a mixed 3.3-V/5-V system environment.

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

QFN – RGY

Reel of 1000

SN74LVC138ARGYR

LC138A

QFN – RSV

Reel of 3000

SN74LVC138ARSVR

ZTP

Tube of 40

SN74LVC138AD

SOIC – D

Reel of 2500

SN74LVC138ADR

LVC138A

Reel of 250

SN74LVC138ADT

SOP – NS

Reel of 2000

SN74LVC138ANSR

LVC138A

–40°C to 85°C

SSOP – DB

Reel of 2000

SN74LVC138ADBR

LC138A

Tube of 90

SN74LVC138APW

TSSOP – PW

Reel of 2000

SN74LVC138APWR

LC138A

Reel of 250

SN74LVC138APWT

TVSOP – DGV

Reel of 2000

SN74LVC138ADGVR

LC138A

VFBGA – GQN

SN74LVC138AGQNR

Reel of 1000

LC138A

VFBGA – ZQN (Pb-free)

SN74LVC138AZQNR

CDIP – J

Tube of 25

SNJ54LVC138AJ

SNJ54LVC138AJ

–55°C to 125°C

CFP – W

Tube of 150

SNJ54LVC138AW

SNJ54LVC138AW

LCCC – FK

Tube of 55

SNJ54LVC138AFK

SNJ54LVC138AFK

(1)

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

2

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Product Folder Links: SN54LVC138A SN74LVC138A