SN74ALVCH245
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
www.ti.com
SCES119G–JULY 1997–REVISED SEPTEMBER 2004
FEATURES
DGV, DW, NS, OR PW PACKAGE
(TOP VIEW)
•
•
•
•
Operates From 1.65 V to 3.6 V
Max tpd of 3.4 ns at 3.3 V
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
V
CC
±24-mA Output Drive at 3.3 V
OE
B1
B2
B3
B4
B5
B6
B7
B8
Bus Hold on Data Inputs Eliminates the Need
for External Pullup/Pulldown Resistors
A3
A4
•
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
A5
A6
A7
DESCRIPTION/ORDERING INFORMATION
This octal bus transceiver is designed for 1.65-V to
3.6-V VCC operation.
A8
GND
The SN74ALVCH245 is designed for asynchronous
communication between data buses. The device
transmits data 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 the
buses are effectively isolated.
<br/>
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
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.
ORDERING INFORMATION
TA
PACKAGE(1)
ORDERABLE PART NUMBER
SN74ALVCH245DW
TOP-SIDE MARKING
ALVCH245
Tube
SOIC - DW
SOP - NS
Tape and reel
SN74ALVCH245DWR
SN74ALVCH245NSR
SN74ALVCH245PW
SN74ALVCH245PWR
SN74ALVCH245DGVR
Tape and reel
Tube
ALVCH245
VB245
-40°C to 85°C
TSSOP - PW
TVSOP - DGV
Tape and reel
Tape and reel
VB245
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
OPERATION
OE
L
DIR
L
B data to A bus
A data to B bus
Isolation
L
H
H
X
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 1997–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.