Texas Instruments SN74AHCT245DW, SN74AHCT245DWR, SN74AHCT245N, SN74AHCT245PWLE, SN74AHCT245PWR Datasheet

SN54AHCT245, SN74AHCT245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCLS233I – OCTOBER 1995 – REVISED JANUARY 2000

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

EPIC

 (Enhanced-Performance Implanted

CMOS) Process

D

Inputs Are TTL-Voltage Compatible

D

Latch-Up Performance Exceeds 250 mA Per

JESD 17

D

ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

D

Package Options Include Plastic

Small-Outline (DW), Shrink Small-Outline

(DB), Thin Very Small-Outline (DGV), Thin

Shrink Small-Outline (PW), and Ceramic

Flat (W) Packages, Ceramic Chip Carriers

(FK), and Standard Plastic (N) and Ceramic

(J) DIPs

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. The control-function implementation

minimizes external timing requirements.

The ’AHCT245 devices allow data transmission

from the A bus to the B bus or from the B bus to the

A bus, depending upon 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.

T o 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.

The SN54AHCT245 is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74AHCT245 is characterized for operation from –40°C to 85°C.

FUNCTION TABLE

(each transceiver)

INPUTS

OE DIR

OPERATION

L L B data to A bus

L H A data to B bus

H X Isolation

Copyright  2000, 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.

SN54AHCT245 ...J OR W PACKAGE

SN74AHCT245 . . . DB, DGV, DW, N, OR PW PACKAGE

(TOP VIEW)

3212019

9

10 11 12 13

4

5

6

7

8

18

17

16

15

14

B1

B2

B3

B4

B5

A3

A4

A5

A6

A7

A2

A1

DIR

B7

B6 OE

A8

GND

B8

V

CC

SN54AHCT245 . . . FK PACKAGE

(TOP VIEW)

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

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.

SN54AHCT245, SN74AHCT245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCLS233I – OCTOBER 1995 – REVISED JANUARY 2000

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

B2

17

B3

16

B4

15

A5

6

A6

7

A7

8

A8

9

A2

3

A3

4

A4

5

OE

A1

2

G3

19

3 EN2 [AB]

B5

14

B6

13

B7

12

B8

11

B1

18

3 EN1 [BA]

1

DIR

1

2

logic diagram (positive logic)

DIR

OE

A1

B1

To Seven Other Channels

1

2

19

18