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SN54ABT245A, SN74ABT245B

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS081L − JANUARY 1991 − REVISED APRIL 2005

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DTypical VOLP (Output Ground Bounce)

<1 V at VCC = 5 V, TA = 25°C

DIoff and Power-Up 3-State Support Hot

Insertion

DHigh-Drive Outputs (−32-mA IOH, 64-mA IOL)

DLatch-Up Performance Exceeds 500 mA Per

JEDEC Standard JESD 17

DESD Protection Exceeds JESD 22

− 2000-V Human-Body Model (A114-A)

− 200-V Machine Model (A115-A)

SN54ABT245A . . . J OR W PACKAGE

SN74ABT245B . . . DB, DGV, DW, N, NS,

OR PW PACKAGE

(TOP VIEW)

3 2 1 20 19

9 10 11 12 13

DIR

B6 OE

GND

VCC

SN54ABT245B . . . FK PACKAGE

(TOP VIEW)

DIR

GND

VCC

SN74ABT245B . . . RGY PACKAGE

(TOP VIEW)

1 20

10 11

DIR

B8 V

GND

description/ordering information

These octal bus transceivers are designed for asynchronous communication between data buses. The devices

transmit 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.

ORDERING INFORMATION

TAPACKAGE†ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N Tube SN74ABT245BN SN74ABT245BN

QFN − RGY Tape and reel SN74ABT245BRGYR AB245B

SOIC DW

Tube SN74ABT245BDW

ABT245B

SOIC − DW Tape and reel SN74ABT245BDWR ABT245B

SOP − NS Tape and reel SN74ABT245BNSR ABT245B

−40° °C to 85 C SSOP − DB Tape and reel SN74ABT245BDBR AB245B

40 C

85 C

TSSOP PW

Tube SN74ABT245BPW

AB245B

TSSOP − PW Tape and reel SN74ABT245BPWR AB245B

TVSOP − DGV Tape and reel SN74ABT245BDGVR AB245B

VFBGA − GQN

Tape and reel

SN74ABT245BGQNR

AB245B

VFBGA − ZQN (Pb-free) Tape and reel SN74ABT245BZQNR AB245B

CDIP − J Tube SNJ54ABT245AJ SNJ54ABT245AJ

−55° °C to 125 C CFP − W Tube SNJ54ABT245AW SNJ54ABT245AW

55 C

125 C

LCCC − FK Tube SNJ54ABT245AFK SNJ54ABT245AFK

†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available

at www.ti.com/sc/package.

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.

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.

SN54ABT245A, SN74ABT245B

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS081L − JANUARY 1991 − REVISED APRIL 2005

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

description/ordering information (continued)

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.

This device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff 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.

terminal assignments

1 2 3 4

AA1 DIR VCC OE

BA3 B2 A2 B1

CA5 A4 B4 B3

DA7 B6 A6 B5

EGND A8 B8 B7

FUNCTION TABLE

INPUTS

OPERATION

OE DIR OPERATION

L L B data to A bus

L H A data to B bus

H X Isolation

logic diagram (positive logic)

DIR

To Seven Other Channels

Pin numbers shown are for the DB, DGV, DW, FK, J, N, NS, PW, RGY, and W packages.

SN74ABT245B . . . GQN OR ZQN PACKAGE

(TOP VIEW)

1234

SN54ABT245A, SN74ABT245B

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS081L − JANUARY 1991 − REVISED APRIL 2005

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI (except I/O ports) (see Note 1) −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high or power-off state, VO −0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . .

Current into any output in the low state, IO: SN54ABT245A 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74ABT245B 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, IIK (VI < 0) −18 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output clamp current, IOK (VO < 0) −50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Note 2): DB package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): DGV package 92°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): DW package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): GQN/ZQN package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): NS package 60°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): PW package 83°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 3): RGY package 37°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, Tstg −65° °C to 150 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

3. The package thermal impedance is calculated in accordance with JESD 51-5.

recommended operating conditions (see Note 4)

SN54ABT245A SN74ABT245B

UNIT

MIN MAX MIN MAX UNIT

VCC Supply voltage 4.5 5.5 4.5 5.5 V

VIH High-level input voltage 2 2 V

VIL Low-level input voltage 0.8 0.8 V

VIInput voltage 0 VCC 0 VCC V

IOH High-level output current −24 −32 mA

IOL Low-level output current 48 64 mA

Δ Δt/ v 5 5 ns/VInput transition rise or fall rate

Δ Δt/ VCC Power-up ramp rate 200 s/Vμ

TAOperating free-air temperature −55 125 −40 85 C°

NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

Product specificaties

Merk:	Texas Instruments
Categorie:	Niet gecategoriseerd
Model:	SN74ABT245BN
Breedte:	26.92 mm
Diepte:	6.6 mm
Hoogte:	4.57 mm
Breedte verpakking:	13.97 mm
Diepte verpakking:	506 mm
Hoogte verpakking:	11.23 mm
Soort:	Logic IC
Type verpakking:	PDIP
Aantal per verpakking:	20 stuk(s)
Temperatuur bij opslag:	-65 - 150 °C
Bedrijfstemperatuur (T-T):	-40 - 85 °C
Aantal pinnen:	20
Breedte (met pennen):	26.92 mm
Diepte (met pennen):	10.92 mm
Hoogte (met pennen):	8.26 mm