Dual 2-to-4-line Decoders/Demultiplexers
HD74HC139
Dual 2-to-4-line Decoders/Demultiplexers
Description
The HD74HC139 contains two independent two-to-four-line ...
Description
HD74HC139
Dual 2-to-4-line Decoders/Demultiplexers
Description
The HD74HC139 contains two independent two-to-four-line decoders each with a single active low enable input (1G or 2G). Data on the slect inputs (1A and 1B or 2A and 2B) cause one of the four normally high outputs to go low.
Features
High Speed Operation: tpd (A, B to Y, 4 levels) = 14 ns typ (C L = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 V 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 G H L L L L Select B X L L H H A X L H L H Outputs Y0 H L H H H Y1 H H L H H Y2 H H H L H Y3 H H H H L
HD74HC139
Pin Arrangement
Enable 1G 1 1A 2 Select 1B 3 1Y0 4 Data Outputs 1Y1 5 1Y2 6 1Y3 7 GND 8 (Top view) B Y0 Y1 Y2 Y3 A B Y0 Y1 Y2 Y3 A G G
16 VCC 15 2G 14 2A Select 13 2B 12 2Y0 11 2Y1 10 2Y2 9 2Y3 Outputs Enable
Data Outputs
Logic Diagram (1/2)
Enable
Y0
A
Y1
Y2
B
Y3
2
HD74HC139
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 volta...
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