Document
D 2-V to 6-V VCC Operation D Inputs Accept Voltages to 6 V D Max tpd of 7 ns at 5 V
description/ordering information
The ’AC245 octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements.
When the output-enable (OE) is low, the device passes noninverted 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. A high on OE disables the device so that the buses are effectively isolated.
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.
SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003
SN54AC245 . . . J OR W PACKAGE SN74AC245 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
DIR 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9
GND 10
20 VCC 19 OE 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8
SN54AC245 . . . FK PACKAGE (TOP VIEW)
OE
VCC
DIR
A1
A2
3 2 1 20 19
A3 4
18 B1
A4 5
17 B2
A5 6
16 B3
A6 7
15 B4
A7 8
14 B5
9 10 11 12 13
B6
B7
B8
GND
A8
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE PART NUMBER
TOP-SIDE MARKING
PDIP − N
Tube
SN74AC245N
SN74AC245N
SOIC − DW
Tube Tape and reel
SN74AC245DW SN74AC245DWR
AC245
−40°C to 85°C
SOP − NS SSOP − DB
Tape and reel Tape and reel
SN74AC245NSR SN74AC245DBR
AC245 AC245
TSSOP − PW CDIP − J
Tube Tape and reel Tube
SN74AC245PW SN74AC245PWR SNJ54AC245J
AC245 SNJ54AC245J
−55°C to 125°C CFP − W
Tube
SNJ54AC245W
SNJ54AC245W
LCCC − FK
Tube
SNJ54AC245FK
SNJ54AC245FK
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.
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. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 2003, Texas Instruments Incorporated On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters.
1
SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003
FUNCTION TABLE
INPUTS OE DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
logic diagram (positive logic)
1 DIR
2 A1
19 OE
18 B1
To Seven Other Channels
absolute maximum ratings over operating.