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54HC139 Datasheet(Fiches technique) 5 Page - Silicon Supplies

Numéro de pièce 54HC139
Description  High Speed CMOS Logic
Télécharger  6 Pages
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Fabricant  SS [Silicon Supplies]
Site Internet  https://siliconsupplies.com/
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High Speed CMOS Logic – 74HC139
Rev 1.0
16/04/18
DUT
CL* 
 
OUTPUT
TEST POINT
Test Circuit
* Includes all probe and jig capacitance
Pad Description
ADDRESS INPUTS
1A, 1B, 2A, 2B
(Pads 2, 3, 14, 13)
When the respective 1–of–4 decoder is enabled these inputs determine which of its four active–low outputs is selected.
OUTPUTS
1Y0, 1Y1, 1Y2, 1Y3, 2Y0, 2Y1, 2Y2, 2Y3
(Pads 4-7, 12, 11, 10, 9)
Active–low outputs. These outputs assume a low level when addressed and the appropriate Select input is active. These outputs
remain high when not addressed or the appropriate Select input is inactive.
CONTROL INPUTS
1G, 2G
(Pads 1, 15)
Active–low select inputs. For a low level on this input, the outputs for that particular decoder follow the Address inputs. A high level on
this input forces all outputs to a high level.
Switching Waveforms
Figure 2 
Figure 1




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