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CD74HCT138

Texas Instruments
Part Number CD74HCT138
Manufacturer Texas Instruments
Description High-Speed CMOS Logic 3 to 8-Line Decoder/Demultiplexer Inverting/Noninverting
Published Oct 15, 2019
Detailed Description CD54HC138, CD74HC138, CD54HCT138, CD74HCT138, CD54HC238, CD74HC238, CD54HCT238, CD74HCT238 SCHS147J – NOVEMBER 1998 – RE...
Datasheet PDF File CD74HCT138 PDF File

CD74HCT138
CD74HCT138

Overview
CD54HC138, CD74HC138, CD54HCT138, CD74HCT138, CD54HC238, CD74HC238, CD54HCT238, CD74HCT238 SCHS147J – NOVEMBER 1998 – REVISED NOVEMBER 2021 CDx4HC138, CDx4HCT138, CDx4HC238, CDx4HCT238 High-Speed CMOS Logic 3- to 8-Line Decoder/Demultiplexer Inverting and Noninverting 1 Features • Select one of eight data outputs: – Active low for '138 – Active high for '238 • l/O port or memory selector • Three enable inputs to simplify cascading • Typical propagation delay of 13 ns at VCC = 5 V, CL = 15 pF, TA = 25°C • Fanout (over temperature range) – Bus driver outputs: 15 LSTTL loads – Standard outputs: 10 LSTTL loads • Wide operating temp range: -55°C to 125°C • Balanced propagation delay and transition times • Significant power reduction compared to LSTTL logic ICs • HC types – 2 V to 6 V operation – High noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5 V • HCT types – 4.
5-V to 5.
5-V operation – Direct LSTTL input logic compatibility, VIL= 0.
8 V (Max), VIH = 2 V (Min) – CMOS input compatibility, Il ≤ 1µA at VOL, VOH 3:8 DECODER OUTPUT ENABLE 000 A0 Y0 001 A1 Y1 010 A2 Y2 011 G0 Y3 100 G1 Y4 101 G2 Y5 110 Y6 111 Y7 2 Description The CDx4HC(T)138 and '238 are three to eight decoders with one standard output strobe (G2) and two active low output strobes (G 1 and G 0).
When the outputs are gated by any of the strobe inputs, they are all forced into the high state.
When the outputs are not disabled by the strobe inputs, only the selected output is low while all others are high.
The CDx4HC(T)238 is a three to eight decoder with one standard output strobe (G2) and two active low output strobes (G 1 and G 0).
When the outputs are gated by any of the strobe inputs, they are all forced into the low state.
When the outputs are not disabled by the strobe inputs, only the selected output is high while all others are low.
PART NUMBER CD74HC138E CD74HCT138E CD74HCT238E CD74HC138M CD74HCT238M CD74HC238NS CD74HC238PW CD74HCT238PW CD54HC138F CD54HCT138F CD54HCT...


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