SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS

SCAS218I – JANUARY 1993 – REVISED JUNE 1998
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
C0068 EPIC (Enhanced-Performance Implanted
CMOS) Submicron Process
C0068 Typical V
OLP
(Output Ground Bounce)
< 0.8 V at V
CC
= 3.3 V, T
A
= 25°C
C0068 Typical V
OHV
(Output V
OH
Undershoot)
> 2 V at V
CC
= 3.3 V, T
A
= 25°C
C0068 Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V V
CC
)
C0068 Power Off Disables Outputs, Permitting
Live Insertion
C0068 ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
C0068 Latch-Up Performance Exceeds 250 mA Per
JESD 17
C0068 Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages
description
This octal bus transceiver is designed for 1.65-V to 3.6-V V
CC
operation.
The SN74LVC245A 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.
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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
The SN74LVC245A is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OPERATION
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation
Copyright  1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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.
EPIC is a trademark of Texas Instruments Incorporated.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
DB, DW, OR PW PACKAGE
(TOP VIEW)