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SN74F243DR Arkusz danych(PDF) 1 Page - Texas Instruments |
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SN74F243DR Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 5 page SN54F243, SN74F243 QUADRUPLE BUS TRANSCEIVERS WITH 3STATE OUTPUTS SDFS086 − MARCH 1987 − REVISED OCTOBER 1993 Copyright 1993, Texas Instruments Incorporated 2−1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 • Asynchronous Communication Between Data Buses • Local Bus-Latch Capability • True Logic • Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs description These quadruple bus transceivers are designed for asynchronous communications between data buses. The control function implementation allows for maximum flexibility in timing. These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic levels at the output-enable (OEBA and OEAB) inputs. The output-enable inputs can be used to disable the device so that the buses are effectively isolated. The dual-enable configuration gives the quadruple bus transceivers the capability to store data by simultaneous enabling of OEBA and OEAB. Each output reinforces its input in this transceiver configuration. Thus, when both control inputs are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines (eight in all) remain at their states. The 4-bit codes appearing on the two sets of buses will be identical for the ′F243. The SN54F243 is characterized for operation over the full military temperature range of − 55 °C to 125 °C. The SN74F243 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS FUNCTION OEAB OEBA FUNCTION L L A to B H H B to A H L Isolation L H Latch A and B (A = B) SN54F243 ...J PACKAGE SN74F243 ...D OR N PACKAGE (TOP VIEW) SN54F243 . . . FK PACKAGE (TOP VIEW) 32 1 20 19 910 11 12 13 4 5 6 7 8 18 17 16 15 14 NC NC B1 NC B2 A1 NC A2 NC A3 NC − No internal connection 1 2 3 4 5 6 7 14 13 12 11 10 9 8 OEAB NC A1 A2 A3 A4 GND VCC OEBA NC B1 B2 B3 B4 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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