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HD74HCT237

Hitachi Semiconductor
Part Number HD74HCT237
Manufacturer Hitachi Semiconductor
Description 3-to-8-line Decoder/Demultiplexer with Address Latch
Published Mar 23, 2005
Detailed Description HD74HCT237 3-to-8-line Decoder/Demultiplexer with Address Latch Description The HD74HCT237 decodes a three-bit Address ...
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HD74HCT237
HD74HCT237

Overview
HD74HCT237 3-to-8-line Decoder/Demultiplexer with Address Latch Description The HD74HCT237 decodes a three-bit Address to one-of-eight active-high outputs.
The device has a transparent latch for storage of the Address.
Two Chip Selects, one active-low and one active-high, are provided to facilitate the demultiplexing, cascading, and chip-selecting functions.
The demultiplexing function is accomplished by using the Address inputs to select the desired device output, and then by using one of the Chip Select as a data input while holding the other one active.
The HD74HCT237 is the noninverting version of the HD74HCT137.
Features • • • • • • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A, B, C to Y) = 23 ns typ (C L = 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) HD74HCT237 Function Table Inputs Enable GL X X L L L L L L L L H G1 X L H H H H H H H H H G2 H X L L L L L L L L L Select C X X L L L L H H H H X B X X L L H H L L H H X A X X L H L H L H L H X Outputs Y0 L L H L L L L L L L Y1 L L L H L L L L L L Y2 L L L L H L L L L L Y3 L L L L L H L L L L Y4 L L L L L L H L L L Y5 L L L L L L L H L L Y6 L L L L L L L L H L Y7 L L L L L L L L L H Output Corresponding to stored address L; all others H Pin Arrangement A B C GL G2 G1 Y7 GND 1 2 3 4 5 6 7 8 (Top view) B C GL G2 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 Y6 2 HD74HCT237 Logic Diagram A Y0 Y1 B Y2 Y3 Y4 C Y5 Y6 GL G2 G1 Y7 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...


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