SN74AVCH16T245 Datasheet, PDF (2/19 Pages) Texas Instruments – 16 BIT DUAL SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3 STATE OUTPUTS

SN74AVCH16T245
16ĆBIT DUALĆSUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3ĆSTATE OUTPUTS
SCES587A − AUGUST 2004 − REVISED OCTOBER 2004
description/ordering information (continued)
This device is fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The V_CC isolation feature ensures that if either V_CC input is at GND, then both ports are in the high-impedance
state.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.
To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
GQL OR ZQL PACKAGE
(TOP VIEW)
123456
A
B
C
D
E
F
G
H
J
K
terminal assignments
1
2
3
4
5
A
1DIR
NC
NC
NC
NC
B
1B2
1B1
GND
GND
1A1
C
1B4
D
1B6
1B3
VCCB
VCCA
1A3
1B5
GND
GND
1A5
E
1B8
1B7
1A7
F
2B1
2B2
2A2
G
2B3
2B4
GND
GND
2A4
H
2B5
J
2B7
2B6
VCCB
VCCA
2A6
2B8
GND
GND
2A8
K
2DIR
NC
NC
NC
NC
NC − No internal connection
6
1OE
1A2
1A4
1A6
1A8
2A1
2A3
2A5
2A7
2OE
FUNCTION TABLE
(each 8-bit section)
INPUTS
OE DIR
OPERATION
L
L
B data to A bus
L
H A data to B bus
H
X
Isolation
2
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