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SN74BCT956DWR Arkusz danych(PDF) 3 Page - Texas Instruments |
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SN74BCT956DWR Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 7 page SN74BCT956 OCTAL BUS TRANSCEIVER AND LATCH WITH 3STATE OUTPUTS SCBS088A − NOVEMBER 1991 − REVISED NOVEMBER 1993 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 FUNCTION TABLE INPUTS DATA I/O OPERATION OR FUNCTION OE DIR LEAB LEBA SAB SBA A1 THRU A8 B1 THRU B8 OPERATION OR FUNCTION X X L X X X Input Unspecified† Store A, B unspecified† X X X L X X Unspecified† Input Store B, A unspecified† L H X X L X Input Output A transparent, real-time A data to B bus (thru) L H H X H X Input Output A transparent, real-time A data to B bus (latch) L H L X L X Input Output A data latched, real-time A data to B bus (thru) L H L X H X Input Output A data latched, latched A data to B bus (latch) L L X X X L Output Input B transparent, real-time B data to A bus (thru) L L X H X H Output Input B transparent, real-time B data to A bus (latch) L L X L X L Output Input B data latched, real-time B data to A bus (thru) L L X L X H Output Input B data latched, latched B data to A bus (latch) H X L L X X Input Input Isolation, A and B data latched H X H H X X Input Input Isolation, no storage † The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled; i.e., data at the bus pins is latched whenever the appropriate latch-enable input is low. logic symbol‡ A2 5 A3 6 A4 7 A5 8 A6 9 A7 10 A8 11 B2 19 B3 18 B4 17 B5 16 B6 15 B7 14 B8 13 OE G3 21 3 EN2 [AB] G5 22 SBA A1 4 B1 20 4D 3 EN1 [BA] 3 DIR C4 23 LEBA C6 1 LEAB G7 2 SAB 5 7 7 5 1 1 6D ≥1 ≥1 1 2 ‡ This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. |
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