74GTL1655TTR Ver la hoja de datos (PDF) - STMicroelectronics
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74GTL1655TTR
STMicroelectronics
74GTL1655TTR Datasheet PDF : 14 Pages
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74GTL1655
FUNCTION TABLE (1)
OEAB
INPUTS
LEAB
CLK
OUTPUT
MODE
A
B
H
X
X
X
Z
Isolation
L
H
X
L
L
Transparent
L
H
X
H
H
Transparent
L
L
L
L
Registered
L
L
H
H
Registered
L
L
H
X
B0(2)
Previous State
L
L
L
X
B0(3)
Previous State
1) A to B data flow is shown. B to A flow is similar, but uses OEBA, LEBA and CLK
2) Output level before the indicated steady-state input conditions were established, provided that CLK was high before LEAB went low
3) Output level before the indicated steady-state input conditions were established
OUTPUT ENABLE TRUTH TABLE
INPUTS
OUTPUTS
OE
OEAB
OEBA
A PORT
B PORT
L
L
L
Active
Active
L
L
H
Z
Active
L
H
L
Active
Z
L
H
H
Z
Z
H
X
X
Z
Z
B-PORT EDGE RATE CONTROL (VERC) TRUTH TABLE
LOGIC LEVEL
H
L
INPUT VERC
NOMINAL VOLTAGE
VCC
GND
OUTPUT B PORT EDGE RATE
Slow
Fast
3/14
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