Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Receiver, transceiver SOIC 20

 

  

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SCLS019D − MARCH 1984 − REVISED AUGUST 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D Operating Voltage Range of 4.5 V to 5.5 V

D High-Current 3-State Outputs Can Drive Up

To 15 LSTTL Loads

D Low Power Consumption, 80-µA Max I

D Typical t

= 14 ns

D ±6-mA Output Drive at 5 V

D Low Input Current of 1 µA Max

D Inputs Are TTL-Voltage Compatible

D True Logic

SN54HCT645 ...J OR W PACKAGE

SN74HCT645 ...DW, N, NS, OR PW PACKAGE

(TOP VIEW)

SN54HCT645 . . . FK PACKAGE

(TOP VIEW)

DIR

GND

3212019

10 11 12 13

DIR

GND

description/ordering information

These octal bus transceivers are designed for asynchronous two-way communication between data buses.

These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending upon the

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

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N Tube of 20 SN74HCT645N SN74HCT645N

SOIC − DW

Tube of 25 SN74HCT645DW

HCT645

SOIC − DW

Reel of 2000 SN74HCT645DWR

HCT645

−40°C to 85°C

SOP − NS Reel of 2000 SN74HCT645NSR HCT645

−40 C to 85 C

Tube of 70 SN74HCT645PW

TSSOP − PW

Reel of 2000 SN74HCT645PWR

HT645

TSSOP − PW

Reel of 250 SN74HCT645PWT

HT645

CDIP − J Tube of 20 SNJ54HCT645J SNJ54HCT645J

−55°C to 125°C

CFP − W Tube of 85 SNJ54HCT645W SNJ54HCT645W

−55 C to 125 C

LCCC − FK Tube of 55 SNJ54HCT645FK SNJ54HCT645FK

†

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

available at www.ti.com/sc/package.

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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.

Summary of content (15 pages)

PAGE 1
SCLS019D − MARCH 1984 − REVISED AUGUST 2003 D Operating Voltage Range of 4.5 V to 5.5 V D High-Current 3-State Outputs Can Drive Up To 15 LSTTL Loads D Low Power Consumption, 80-µA Max ICC D Typical tpd = 14 ns SN54HCT645 . . . J OR W PACKAGE SN74HCT645 . . .
PAGE 2
SCLS019D − MARCH 1984 − REVISED AUGUST 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) OE DIR A1 19 1 2 18 B1 To Seven Other Transceivers absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 3
SCLS019D − MARCH 1984 − REVISED AUGUST 2003 recommended operating conditions (see Note 3) SN54HCT645 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 VCC VIH Supply voltage VIL VI Low-level input voltage Input voltage 0 VO ∆t/∆v Output voltage 0 High-level input voltage VCC = 4.5 V to 5.5 V VCC = 4.5 V to 5.5 V SN74HCT645 2 2 Input transition rise/fall time V V 0.8 VCC VCC UNIT 0 0 500 0.
PAGE 4
SCLS019D − MARCH 1984 − REVISED AUGUST 2003 switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tpd A or B B or A ten OE A or B tt A or B VCC MIN TA = 25°C TYP MAX SN54HCT645 MIN MAX SN74HCT645 MIN MAX 4.5 V 20 30 45 38 5.5 V 18 27 41 34 4.5 V 36 59 89 74 5.5 V 30 53 80 67 4.
PAGE 5
SCLS019D − MARCH 1984 − REVISED AUGUST 2003 PARAMETER MEASUREMENT INFORMATION VCC From Output Under Test CL (see Note A) PARAMETER tPZH S1 Test Point ten RL 1 kΩ tPZL tPHZ tdis S2 −− LOAD CIRCUIT 2.7 V 2.7 V S1 S2 50 pF or 150 pF Open Closed Closed Open Open Closed Closed Open Open Open 1 kΩ tPLZ tpd or tt Input 1.3 V 0.3 V CL RL 50 pF 50 pF or 150 pF 3V 1.3 V 0.
PAGE 6
PACKAGE OPTION ADDENDUM www.ti.
PAGE 7
PACKAGE OPTION ADDENDUM www.ti.com 28-Aug-2010 OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PAGE 8
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 SN74HCT645DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1 SN74HCT645PWT TSSOP PW 20 250 330.0 16.4 6.95 7.1 1.6 8.0 16.
PAGE 9
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) SN74HCT645DWR SOIC DW 20 2000 367.0 367.0 45.0 SN74HCT645PWT TSSOP PW 20 250 367.0 367.0 38.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.