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SN74ABT543 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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SN74ABT543 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 7 page SN74ABT543A OCTAL REGISTERED TRANSCEIVER WITH 3-STATE OUTPUTS SCBS464A – JUNE 1992 – REVISED JUNE 1994 Copyright © 1994, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • State-of-the-Art EPIC-ΙΙB ™ BiCMOS Design Significantly Reduces Power Dissipation • ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0) • Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17 • Typical V OLP (Output Ground Bounce) < 1 V at VCC = 5 V, TA = 25°C • High-Drive Outputs (–32-mA I OH, 64-mA IOL) • Package Options Include Plastic Small-Outline (DW) and Shrink Small-Outline (DB) Packages, and Standard Plastic 300-mil DIPs (JT) description The SN74ABT543A octal transceiver contains two sets of D-type latches for temporary storage of data flowing in either direction. Separate latch-enable (LEAB or LEBA) and output-enable (OEAB or OEBA) inputs are provided for each register to permit independent control in either direction of data flow. The A-to-B enable (CEAB) input must be low in order to enter data from A or to output data from B. If CEAB is low and LEAB is low, the A-to-B latches are transparent; a subsequent low-to-high transition of LEAB puts the A latches in the storage mode. With CEAB and OEAB both low, the 3-state B outputs are active and reflect the data present at the output of the A latches. Data flow from B to A is similar but requires using the CEBA, LEBA, and OEBA inputs. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The SN74ABT543A is packaged in TI’s shrink small-outline package (DB), which provides the same I/O pin count and functionality of standard small-outline packages in less than half the printed-circuit-board area. The SN74ABT543A is characterized for operation from – 40 °C to 85°C. FUNCTION TABLE† INPUTS OUTPUT CEAB LEAB OEAB A B H X X X Z X XH X Z L HL X B0‡ L LL L L L L L H H † A-to-B data flow is shown; B-to-A flow control is the same except that it uses CEBA, LEBA, and OEBA. ‡ Output level before the indicated steady-state input conditions were established. DB, DW, OR NT PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 LEBA OEBA A1 A2 A3 A4 A5 A6 A7 A8 CEAB GND VCC CEBA B1 B2 B3 B4 B5 B6 B7 B8 LEAB OEAB EPIC- ΙΙB is a trademark of 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. |
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