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SN54HCT652 Datasheet(PDF) 1 Page - Texas Instruments |
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SN54HCT652 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page SN54HCT652, SN74HCT652 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS179B – MARCH 1984 – REVISED MAY 1997 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Inputs Are TTL-Voltage Compatible D Independent Registers and Enables 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 ’HCT652 consist of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. Output-enable (OEAB and OEBA) inputs are provided to control the transceiver functions. Select-control (SAB and SBA) inputs are provided to select real-time or stored data transfer. A low input level selects real-time data; a high input level selects stored data. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the ’HCT652. Data on the A or B data bus, or both, can be stored in the internal D-type flip-flops by low-to-high transitions at the appropriate clock (CLKAB or CLKBA) terminals regardless of the select- or output-control terminals. When SAB and SBA are in the real-time transfer mode, it is possible to store data without using the internal D-type flip-flops by simultaneously enabling OEAB and OEBA. In this configuration, each output reinforces its input. When all other data sources to the two sets of bus lines are at high impedance, each set of bus lines remains at its last state. The SN54HCT652 is characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74HCT652 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. SN54HCT652 . . . JT OR W PACKAGE SN74HCT652 . . . DW OR NT PACKAGE (TOP VIEW) SN54HCT652 . . . FK PACKAGE (TOP VIEW) NC – No internal connection 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 CLKAB SAB OEAB A1 A2 A3 A4 A5 A6 A7 A8 GND VCC CLKBA SBA OEBA B1 B2 B3 B4 B5 B6 B7 B8 32 1 13 14 5 6 7 8 9 10 11 OEBA B1 B2 NC B3 B4 B5 A1 A2 A3 NC A4 A5 A6 4 15 16 17 18 28 27 26 25 24 23 22 21 20 19 12 |
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