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74F2645SC Fiches technique(PDF) 2 Page - Fairchild Semiconductor

No de pièce 74F2645SC
Description  Octal Bus Transceiver with 25廓 Series Resistors in the Outputs
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74F2645SC Fiches technique(HTML) 2 Page - Fairchild Semiconductor

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Unit Loading/Fan Out
Functional Description
The output enable (OE) is active LOW. If the device is dis-
abled (OE HIGH), the outputs are in the high impedance
state. The transmit/receive input (T/R) controls whether
data is transmitted from the A bus to the B bus or from the
B bus to the A bus. When T/R is LOW, B data is sent to the
A bus. If T/R is HIGH, A data is sent to the B bus.
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Don’t Care
Z
= High Impedance State
Logic Diagram
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
OE
Output Enable Input (Active LOW)
1.0/1.0
20
µA/−0.6 mA
T/R
Transmit/Receive Input
1.0/1.0
20
µA/−0.6 mA
A0–A7
Side A Inputs or
3.5/0.667
70
µA/−0.4 mA
3-STATE Outputs
750/20
−15 mA/12 mA
B0–B7
Side B Inputs or
3.5/0.667
70
µA/−0.4 mA
3-STATE Outputs
750/20
−15 mA/12 mA
Inputs
Outputs
OE
T/R
L
L
Bus B data to Bus A
L
H
Bus A data to Bus B
HX
Z


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