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74F620 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. 74F620
Description  Inverting Octal Bus Transceiver with 3-STATE Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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74F620 Datasheet(HTML) 2 Page - Fairchild Semiconductor

   
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Unit Loading/Fan Out
Functional Description
The enable inputs GAB and GBA control whether data is
transmitted from the A bus to the B bus or from the B bus to
the A bus. If both GBA and GAB are disabled (GBA HIGH
and GAB LOW), the outputs are in the high impedance
state and data is stored at the A and B busses. When GBA
is active LOW, B data is sent to the A bus. When GAB is
active HIGH, data from the A bus is sent to the B bus. If
both enable inputs are active (GBA LOW and GAB HIGH)
B data is sent to the A bus while A data is sent to the B bus.
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
Z
= High Impedance
Logic Diagrams
74F620
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
74F623
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
GBA, GAB
Enable Inputs
1.0/1.0
20
µA/−0.6 mA
A0–A7
A Inputs or
3.5/1.083
70
µA/−0.4 mA
3-STATE Outputs
150/40
−3 mA/64 mA
B0–B7
B Inputs or
3.5/1.083
70
µA/−0.4 mA
3-STATE Outputs
150/40
−3 mA/64 mA
Enable Inputs
Operation
GBA
GAB
74F620
74F623
LL
B Data to A Bus
B Data to A Bus
HH
A Data to B Bus
A Data to B Bus
HL
Z
Z
LH
B Data to A Bus,
B Data to A Bus,
A Data to B Bus
A Data to B Bus


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