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SN74BCT646DWRE4 Datasheet(PDF) 1 Page - Texas Instruments |
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SN74BCT646DWRE4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 18 page SN54BCT646, SN74BCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3STATE OUTPUTS SCBS037D − AUGUST 1989 − REVISED MAY 2004 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D State-of-the-Art BiCMOS Design Significantly Reduces ICCZ D Bus Transceivers/Registers D Independent Registers and Enables for A and B Buses D Multiplexed Real-Time and Stored Data D ESD Protection Exceeds JESD 22 − 2000-V Human-Body Model (A114-A) − 200-V Machine Model (A115-A) CLKAB SAB DIR A1 A2 A3 A4 A5 A6 A7 A8 GND VCC CLKBA SBA OE B1 B2 B3 B4 B5 B6 B7 B8 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 SN54BCT646 ...JT OR W PACKAGE SN74BCT646 . . . DW OR NT PACKAGE (TOP VIEW) 5 6 7 8 9 10 11 25 24 23 22 21 20 19 432 1 28 12 13 14 15 16 OE B1 B2 NC B3 B4 B5 A1 A2 A3 NC A4 A5 A6 SN54BCT646...FK PACKAGE (TOP VIEW) 17 18 27 26 NC − No internal connection description/ordering information These devices consist of bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the ’BCT646 devices. Output-enable (OE) and direction-control (DIR) inputs are provided to control the transceiver functions. In the transceiver mode, data present at the high-impedance port can be stored in either register or in both. The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. The direction control (DIR) determines which bus will receive data when OE is low. In the isolation mode (OE high), A data can be stored in one register and/or B data can be stored in the other register. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING PDIP − NT Tube SN74BCT646NT SN74BCT646NT 0 °C to 70°C SOIC − DW Tube SN74BCT646DW BCT646 0 C to 70 C SOIC − DW Tape and reel SN74BCT646DWR BCT646 CDIP − JT Tube SNJ54BCT646JT SNJ54BCT646JT −55 °C to 125°C CFP − W Tube SNJ54BCT646W SNJ54BCT646W −55 C to 125 C LCCC − FK Tube SNJ54BCT646FK SNJ54BCT646FK † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Copyright 2004, 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. 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. |
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