Details, datasheet, quote on part number: SN74HC640PWT
CategoryLogic => Transceivers => Standard Transceivers
TitleStandard Transceivers
Descriptionti SN74HC640, Octal Bus Transceivers With 3-State Outputs
CompanyTexas Instruments, Inc.
DatasheetDownload SN74HC640PWT datasheet
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Features, Applications

D Wide Operating Voltage Range V D High-Current 3-State Outputs Can Drive Up
Typical tpd ns 6-mA Output Drive 5 V Low Input Current 1 A Max Inverting Logic

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

TA PDIP - N SOIC to 85C SOP - NS PACKAGE Tube of 20 Tube of 25 Reel of 2000 Reel of 2000 Tube of 70 TSSOP - PW CDIP to 125C CFP - W Reel of 2000 Reel of 250 Tube of 20 Tube of 85 ORDERABLE PART NUMBER SNJ54HC640W HC640 TOP-SIDE MARKING SN74HC640N

LCCC - FK Tube 55 SNJ54HC640FK Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

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.

On products compliant to MILPRF38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters.

FUNCTION TABLE (each transceiver) INPUTS L H DIR H X OPERATION B data to A bus A data to B bus Isolation

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

Supply voltage range, VCC. 7 V Input clamp current, IIK (VI VI > VCC) (see Note 20 mA Output clamp current, IOK (VO VO > VCC) (see Note 20 mA Continuous output current, IO (VO 0 to VCC). 35 mA Continuous current through VCC or GND. 70 mA Package thermal impedance, JA (see Note 2): DW package. 58C/W N package. 69C/W NS package. 60C/W PW package. 83C/W Storage temperature range, Tstg. to 150C

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 voltage ratings may be exceeded if the input and output current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51-7.

SN54HC640 MIN VCC VIH Supply voltage VCC 2 V VCC 4.5 V VCC 6 V VCC 2 V VIL VI VO t/v Low-level input voltage Input voltage Output voltage VCC 2 V VCC 4.5 V VCC 6 V VCC 4.5 V VCC 6 V VCC NOM 5 MAX 6 SN74HC640 MIN VCC 400 ns NOM 5 MAX 6 UNIT V

TA Operating free-air temperature C NOTE 3: 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.

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)


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