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74GTLPH1655DGGRE4 Datasheet(PDF) 3 Page - Texas Instruments

Part # 74GTLPH1655DGGRE4
Description  16-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE UNIVERSAL BUS TRANSCEIVER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

74GTLPH1655DGGRE4 Datasheet(HTML) 3 Page - Texas Instruments

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FUNCTIONAL DESCRIPTION (CONTINUED)
SN74GTLPH1655
16-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE
UNIVERSAL BUS TRANSCEIVER
SCES294C – OCTOBER 1999 – REVISED MAY 2005
Data flow for each word is determined by the respective latch enables (xLEAB and xLEBA), output enables
(xOEAB and xOEBA), and clock (CLK). The output enables (1OEAB, 1OEBA, 2OEAB, and 2OEBA) control
byte 1 and byte 2 data for the A-to-B and B-to-A directions, respectively. Note that CLK is common to both
directions and both 8-bit words. OE also is common and disables all I/O ports simultaneously.
For A-to-B data flow, the devices operate in the transparent mode when LEAB is high. When LEAB transitions
low, the A data is latched independent of CLK high or low. If LEAB is low, the A data is registered on the CLK
low-to-high transition. When OEAB is low, the outputs are active. With OEAB high, the outputs are in the
high-impedance state.
The data flow for the B-to-A direction is identical, except OEBA, LEBA, and CLK are used.
FUNCTION TABLES
XXX
FUNCTION(1)
INPUTS
OUTPUT
MODE
B
OEAB
LEAB
CLK
A
H
X
X
X
Z
Isolation
L
L
H
X
B0(2)
Latched storage of A data
L
L
L
X
B0(3)
L
H
X
L
L
True transparent
L
H
X
H
H
L
L
L
L
Clocked storage of A data
L
L
H
H
(1)
A-to-B data flow is shown. B-to-A flow is similar, but uses OEBA, LEBA, and CLK. The condition
when OEAB and OEBA are both low at the same time is not recommended.
(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
INPUTS
OUTPUTS
OE
OEAB
OEBA
A PORT
B PORT
L
L
L
Active
Active(1)
L
L
H
Z
Active
L
H
L
Active
Z
L
H
H
Z
Z
H
X
X
Z
Z
(1)
This condition is not recommended.
B-PORT EDGE-RATE CONTROL (ERC)
INPUT ERC
OUTPUT
B-PORT
LOGIC LEVEL
NOMINAL VOLTAGE
EDGE RATE
H
VCC
Slow
L
GND
Fast
3


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