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HD74HCT138

Hitachi Semiconductor
Part Number HD74HCT138
Manufacturer Hitachi Semiconductor
Description 3-to-8-line Decoder/Demultiplexer
Published Mar 23, 2005
Detailed Description HD74HCT138 3-to-8-line Decoder/Demultiplexer Description The HD74HCT138 has 3 binary select inputs (A, B, and C). If th...
Datasheet PDF File HD74HCT138 PDF File

HD74HCT138
HD74HCT138

Overview
HD74HCT138 3-to-8-line Decoder/Demultiplexer Description The HD74HCT138 has 3 binary select inputs (A, B, and C).
If the device is enabled these inputs determine which one of the eight normally high outputs will go low.
Two active low and one active high enables (G1, G2A and G2B) are provided to ease the cascading of decoders.
Features • • • • • • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A, B, C to Y) = 18.
5 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 4.
5 to 5.
5 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) HD74HCT138 Function Table Inputs Enable G1 X X L H H H H H H H H G2A X H X L L L L L L L L G2B H X X L L L L L L L L Select C X X X L L L L H H H H B X X X L L H H L L H H A X X X L H L H L H L H Outputs Y0 H H H L H H H H H H H Y1 H H H H L H H H H H H Y2 H H H H H L H H H H H Y3 H H H H H H L H H H H Y4 H H H H H H H L H H H Y5 H H H H H H H H L H H Y6 H H H H H H H H H L H Y7 H H H H H H H H H H L Pin Arrangement A Select Inputs B C G2A Enable Inputs G2B G1 Outputs Y7 GND 1 2 3 4 5 6 7 8 (Top view) B C G2A G2B G1 Y7 A Y0 Y1 Y2 Y3 Y4 Y5 16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6 Outputs Y6 2 HD74HCT138 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH VIL Output voltage VOH Ta = –40 to +85°C Max — 0.
8 — — 0.
1 0.
33 ±1.
0 40 µA µA V Unit V V V Test Conditions VCC (V) 4.
5 to 5.
5 4.
5 to 5.
5 4.
5 4.
5 4.
5 4.
5 5.
5 5.
5 Vin = VIH or VIL I OH = –20 µA I OH = –4 mA Vin = VIH or VIL I OL = 20 µA I OL = 4 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA Min Typ Max Min 2.
0 — 4.
4 — — — — 2.
0 0.
8 — — — 4.
4 4.
13 4.
18 — VOL — — Input current Quiescent supply current Iin I CC — — — — — — 0.
1 — 0.
26 — ±0.
1 — 4.
0 — AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25°C Item Symbol Ta = –40 to +85°C Max 44 38 38 38 44 38 19 10 Unit ns ns ns ns ns ns ns pF Test Conditions VCC (V) 4.
5 4...


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