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HD74HC42

Hitachi Semiconductor
Part Number HD74HC42
Manufacturer Hitachi Semiconductor
Description BCD-to-Decimal Decoder
Published Mar 23, 2005
Detailed Description HD74HC42 BCD-to-Decimal Decoder Description Data on the four input pins select one of the 10 outputs corresponding to t...
Datasheet PDF File HD74HC42 PDF File

HD74HC42
HD74HC42

Overview
HD74HC42 BCD-to-Decimal Decoder Description Data on the four input pins select one of the 10 outputs corresponding to the value of the BCD number on the inputs.
An output will go low when selected, otherwise it remains high.
If the input data is not a valid BCD number all outputs will remain high.
Features • • • • • High Speed Operation: tpd = 13 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) HD74HC42 Function Table BCD Inputs No.
0 1 2 3 4 5 6 7 8 9 D L L L L L L L L H H C L L L L H H H H L L L L H H H H B L L H H L L H H L L H H L L H H A L H L H L H L H L H L H L H L H Decimal Outputs 0 L H H H H H H H H H H H H H H H 1 H L H H H H H H H H H H H H H H 2 H H L H H H H H H H H H H H H H 3 H H H L H H H H H H H H H H H H 4 H H H H L H H H H H H H H H H H 5 H H H H H L H H H H H H H H H H 6 H H H H H H L H H H H H H H H H 7 H H H H H H H L H H H H H H H H 8 H H H H H H H H L H H H H H H H 9 H H H H H H H H H L H H H H H H INVALID H H H H H H Pin Arrangement 0Y 1 0 1Y 2 2Y 3 Outputs 3Y 4 4Y 5 5Y 6 6Y 7 GND 8 (Top view) 1 2 3 4 5 6 7 8 9 D C B A 16 VCC 15 A 14 B 13 C 12 D 11 9Y 10 8Y 9 7Y Outputs 2 Inputs HD74HC42 Logic Diagram 0Y 1Y A 2Y 3Y B 4Y 5Y C 6Y 7Y D 8Y 9Y 3 HD74HC42 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.
...


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