Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Receiver, transceiver SN 74 LS 245 PDIP 20

SN54LS245, SN74LS245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3-State Outputs Drive Bus Lines Directly

PNP Inputs Reduce dc Loading on Bus

Lines

Hysteresis at Bus Inputs Improves Noise

Margins

Typical Propagation Delay Times Port to

Port, 8 ns

TYPE

(SINK

CURRENT)

(SOURCE

CURRENT)

SN54LS245 12 mA –12 mA

SN74LS245 24 mA –15 mA

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. The control-function implementation

minimizes external timing requirements.

The devices allow data transmission 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 disable the device so that the

buses are effectively isolated.

ORDERING INFORMATION

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP – N Tube SN74LS245N SN74LS245N

SOIC – DW

Tube SN74LS245DW

LS245

0°C to 70°C

SOIC

–

Tape and reel SN74LS245DWR

LS245

SOP – NS Tape and reel SN74LS245NSR 74LS245

SSOP – DB Tape and reel SN74LS245DBR LS245

CDIP – J

Tube SN54LS245J SN54LS245J

–55

Cto125

CDIP

–

Tube SNJ54LS245J SNJ54LS245J

–

55°C

125°C

CFP – W Tube SNJ54LS245W SNJ54LS245W

LCCC – FK Tube SN54LS245FK SN54LS245FK

†

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.

3 2 1 20 19

910111213

DIR

GND

SN54LS245 . . . FK PACKAGE

(TOP VIEW)

DIR

GND

SN54LS245 ...J OR W PACKAGE

SN74LS245 ... DB, DW, N, OR NS PACKAGE

(TOP VIEW)

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.

Summary of content (19 pages)

PAGE 1
SN54LS245, SN74LS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002 D D D D 3-State Outputs Drive Bus Lines Directly PNP Inputs Reduce dc Loading on Bus Lines Hysteresis at Bus Inputs Improves Noise Margins Typical Propagation Delay Times Port to Port, 8 ns IOL (SINK CURRENT) IOH (SOURCE CURRENT) SN54LS245 12 mA –12 mA SN74LS245 24 mA –15 mA TYPE SN54LS245 . . . J OR W PACKAGE SN74LS245 . . .
PAGE 2
SN54LS245, SN74LS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002 FUNCTION TABLE INPUTS OE DIR OPERATION L L B data to A bus L H A data to B bus H X Isolation schematics of inputs and outputs EQUIVALENT OF EACH INPUT TYPICAL OF ALL OUTPUTS VCC VCC 50 Ω NOM 9 kΩ NOM Input Output logic diagram (positive logic) DIR 1 19 A1 2 18 To Seven Other Channels 2 OE POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 B1
PAGE 3
SN54LS245, SN74LS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
SN54LS245, SN74LS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) TEST CONDITIONS† PARAMETER VIH VIL High-level input voltage VIK Input clamp voltage SN54LS245 TYP‡ MIN SN74LS245 MAX 2 TYP‡ VCC = MIN, VCC = MIN II = –18 mA VCC = MIN, VIH = 2 V V, VIL = VIL(max) IOH = –3 mA IOL = 12 mA VOH High level output voltage High-level VOL Low leve
PAGE 5
SN54LS245, SN74LS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002 PARAMETER MEASUREMENT INFORMATION SERIES 54LS/74LS DEVICES VCC Test Point VCC RL From Output Under Test CL (see Note A) CL (see Note A) High-Level Pulse 1.3 V S2 LOAD CIRCUIT FOR 3-STATE OUTPUTS 3V Timing Input 1.
PAGE 6
PACKAGE OPTION ADDENDUM www.ti.
PAGE 7
PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 9
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant SN74LS245DBR SSOP DB 20 2000 330.0 16.4 8.2 7.5 2.5 12.0 16.0 Q1 SN74LS245DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1 SN74LS245NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.
PAGE 10
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN74LS245DBR SSOP DB 20 2000 367.0 367.0 38.0 SN74LS245DWR SOIC DW 20 2000 367.0 367.0 45.0 SN74LS245NSR SO NS 20 2000 367.0 367.0 45.
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MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN 0,38 0,22 0,65 28 0,15 M 15 0,25 0,09 8,20 7,40 5,60 5,00 Gage Plane 1 14 0,25 A 0°–ā8° 0,95 0,55 Seating Plane 2,00 MAX 0,10 0,05 MIN PINS ** 14 16 20 24 28 30 38 A MAX 6,50 6,50 7,50 8,50 10,50 10,50 12,90 A MIN 5,90 5,90 6,90 7,90 9,90 9,90 12,30 DIM 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters.
PAGE 19
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