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HD74HC238

Hitachi Semiconductor
Part Number HD74HC238
Manufacturer Hitachi Semiconductor
Description 3-to-8-line Decoder/Demultiplexer
Published Mar 23, 2005
Detailed Description HD74HC238 3-to-8-line Decoder/Demultiplexer Description The HD74HC238 has 3 binary select inputs (A, B and C). If the d...
Datasheet PDF File HD74HC238 PDF File

HD74HC238
HD74HC238

Overview
HD74HC238 3-to-8-line Decoder/Demultiplexer Description The HD74HC238 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 • • • • • High Speed Operation: tpd (Data to Y) = 15 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) 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 L L L H L L L L L L L Y1 L L L L H L L L L L L Y2 L L L L L H L L L L L Y3 L L L L L L H L L L L Y4 L L L L L L L H L L L Y5 L L L L L L L L H L L Y6 L L L L L L L L L H L Y7 L L L L L L L L L L H HD74HC238 Pin Arrangement A Select Inputs B C G2A Enable Inputs G2B G1 Output Y7 GND 1 2 3 4 5 6 7 8 B C G2A G2B G1 Y7 Y6 A Y0 Y1 Y2 Y3 Y4 Y5 16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6 Outputs (Top view) 2 HD74HC238 Logic Diagram G1 G2B G2A Y1 Y0 A B Y2 Y3 C Y4 Y5 Y6 Y7 3 HD74HC238 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.
5 1.
35 1.
8 — — — — — 0.
1 0.
1 0.
1 0.
33 0.
33 ±1.
0 40 µA µA I OL = 4 mA I OL = 5.
2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.
2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.
0 4.
5 6.
0 1.
5 — 3.
15 — 4.
2 — — — — — — — — — — 0.
5 1.
5 3.
15 4.
2 — VIL 2.
0 4.
5 6.
0 1.
35 — 1.
8 — 1.
9 4.
4 5.
9 4.
13 5.
63 — — — Output voltage VOH 2.
0 4.
5 6.
0 4.
5 6.
0 1.
9 2.
0 — 4.
4 4.
5 — 5.
9 6.
0 — 4.
18 — 5.
68 — — — — — — — — — — VOL 2.
0 4.
5 6.
0 4.
5 6.
0 0.
0 0.
1 0.
0 0.
1 0.
0 0.
1 — — — — 0.
26 — 0.
26 — ±0.
1 — 4.
0 — Input current Quiescent supp...


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