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SN54HCT646FK Datasheet(PDF) 1 Page - Texas Instruments |
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SN54HCT646FK Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178B – MARCH 1984 – REVISED MAY 1997 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Inputs Are TTL-Voltage Compatible D Independent Registers for A and B Buses D Multiplexed Real-Time and Stored Data D True Data Paths D High-Current 3-State Outputs Can Drive up to 15 LSTTL Loads D Package Options Include Plastic Small-Outline (DW) and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs description The ’HCT646 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 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 ’HCT646. Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at the high-impedance port can be stored in either or both registers. The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. DIR determines which bus receives data when OE is active (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. When an output function is disabled, the input function is still enabled and can be used to store and transmit data. Only one of the two buses, A or B, can be driven at a time. The SN54HCT646 is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74HCT646 is characterized for operation from –40 °C to 85°C. Copyright © 1997, Texas Instruments Incorporated UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information 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. 14 15 16 17 SN54HCT646 . . . JT OR W PACKAGE SN74HCT646 . . . DW OR NT PACKAGE (TOP VIEW) SN54HCT646 . . . FK PACKAGE (TOP VIEW) 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 5 6 7 8 9 10 11 25 24 23 22 21 20 19 43 2 1 28 12 13 OE B1 B2 NC B3 B4 B5 A1 A2 A3 NC A4 A5 A6 18 27 26 NC – No internal connection |
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