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SN74VMEH22501AZQLR bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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4 / 30 page SN74VMEH22501A 8BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1BIT BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3STATE OUTPUTS SCES620 – DECEMBER 2004 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional description for 8-bit UBT transceiver The 3A and 3B data flow in each direction is controlled by the OE and direction-control (DIR) inputs. When OE is low, all 3A- or 3B-port outputs are active. When OE is high, all 3A- or 3B-port outputs are in the high-impedance state. FUNCTION TABLE INPUTS OUTPUT OE DIR OUTPUT H X Z L H 3A data to 3B bus L L 3B data to 3A bus The UBT transceiver functions are controlled by latch-enable (LE) and clock (CLKAB and CLKBA) inputs. For 3A-to-3B data flow, the UBT operates in the transparent mode when LE is high. When LE is low, the 3A data is latched if CLKAB is held at a high or low logic level. If LE is low, the 3A data is stored in the latch/flip-flop on the low-to-high transition of CLKAB. The UBT transceiver data flow for 3B to 3A is similar to that of 3A to 3B, but uses CLKBA. UBT TRANSCEIVER FUNCTION TABLE† INPUTS OUTPUT MODE OE LE CLKAB 3A OUTPUT 3B MODE H X X X Z Isolation L L H X B0‡ Latched storage of 3A data L LL X B0§ Latched storage of 3A data L H X L L True transparent L HX H H True transparent L L ↑ L L Clocked storage of 3A data L L ↑ H H Clocked storage of 3A data † 3A-to-3B data flow is shown; 3B-to-3A data flow is similar, but uses CLKBA. ‡ Output level before the indicated steady-state input conditions were established, provided that CLKAB was high before LE went low § Output level before the indicated steady-state input conditions were established The UBT transceiver can replace any of the functions shown in Table 1. Table 1. SN74VMEH22501A UBT Transceiver Replacement Functions FUNCTION 8 BIT Transceiver ’245, ’623, ’645 Buffer/driver ’241, ’244, ’541 Latched transceiver ’543 Latch ’373, ’573 Registered transceiver ’646, ’652 Flip-flop ’374, ’574 SN74VMEH22501A UBT transceiver replaces all above functions |
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