Datasheet
SN54LVC138A, SN74LVC138A
SCAS291V –MARCH 1993–REVISED JANUARY 2013
www.ti.com
DESCRIPTION/ORDERING INFORMATION
The SN54LVC138A 3-line to 8-line decoder/demultiplexer is designed for 2.7-V to 3.6-V V
CC
operation, and the
SN74LVC138A 3-line to 8-line decoder/demultiplexer is designed for 1.65-V to 3.6-V V
CC
operation.
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
T
A
PACKAGE
(1)
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 Submit Documentation Feedback Copyright © 1993–2013, Texas Instruments Incorporated
Product Folder Links: SN54LVC138A SN74LVC138A