Datasheet
SN54ALVTHR16245, SN74ALVTHR16245
2.5-V/3.3-V 16-BIT BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCES075D – JUNE 1996 – REVISED DECEMBER 2002
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description/ordering information (continued)
These devices can be used as two 8-bit transceivers or one 16-bit transceiver. They allow data transmission
from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control
(DIR) input. The output-enable (OE
) input can be used to disable the device so that the buses are effectively
isolated.
All outputs are designed to sink up to 12 mA, and include equivalent 30-Ω resistors to reduce overshoot and
undershoot.
These devices are fully specified for hot-insertion applications using I
off
and power-up 3-state. The I
off
circuitry
disables the outputs, preventing damaging current backflow through the device when it is powered down. The
power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup
or pulldown resistors with the bus-hold circuitry is not recommended.
When V
CC
is between 0 and 1.2 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.2 V, 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.
terminal assignments
123456
A 1DIR NC NC NC NC 1OE
B 1B2 1B1 GND GND 1A1 1A2
C 1B4 1B3 V
CC
V
CC
1A3 1A4
D 1B6 1B5 GND GND 1A5 1A6
E 1B8 1B7 1A7 1A8
F 2B1 2B2 2A2 2A1
G 2B3 2B4 GND GND 2A4 2A3
H 2B5 2B6 V
CC
V
CC
2A6 2A5
J 2B7 2B8 GND GND 2A8 2A7
K 2DIR NC NC NC NC 2OE
NC – No internal connection
FUNCTION TABLE
(each 8-bit section)
INPUTS
OPERATION
OE DIR
OPERATION
L L B data to A bus
L H A data to B bus
H X Isolation
SN74ALVTHR16245 . . . GQL PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
213465
K