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SN74BCT648NT Datasheet(PDF) 1 Page - Texas Instruments |
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SN74BCT648NT Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page SN54BCT648 . . . JT OR W PACKAGE SN74BCT648 . . . DW OR NT PACKAGE (TOP VIEW) 5 6 7 8 9 10 11 25 24 23 22 21 20 19 43 2 1 28 12 13 14 15 16 OE B1 B2 NC B3 B4 B5 A1 A2 A3 NC A4 A5 A6 SN54BCT648...FK PACKAGE (TOP VIEW) 17 18 27 26 NC − No internal connection 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 SN54BCT648, SN74BCT648 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3STATE OUTPUTS SCBS050B − MAY 1990 − REVISED APRIL 1994 Copyright 1994, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 • State-of-the-Art BiCMOS Design Significantly Reduces ICCZ • Independent Registers for A and B Buses • Multiplexed Real-Time and Stored Data • Inverting Data Paths • Power-Up High-Impedance Mode • Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic and Ceramic 300-mil DIPS (JT, NT) description These devices consist of bus transceiver circuits with 3-state outputs, 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 will be 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 ′BCT648. 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 may be stored in either register or in both. The select control (SAB and SBA) can multiplex stored and real-time (transparent mode) data. The direction control determines which bus will receive data when OE is active (low). In the isolation mode (OE high), A data may be stored in one register and/or B data may be stored in the other register. When an output function is disabled, the input function is still enabled and may be used to store and transmit data. Only one of the two buses, A or B, may be driven at a time. The SN54BCT648 is characterized for operation over the full military temperature range of −55 °C to 125°C. The SN74BCT648 is characterized for operation from 0 °C to 70°C. 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. |
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