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SN74ABTH32501PZ Datasheet(PDF) 3 Page - Texas Instruments |
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SN74ABTH32501PZ Datasheet(HTML) 3 Page - Texas Instruments |
3 / 9 page SN54ABTH32501, SN74ABTH32501 36-BIT UNIVERSAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCBS229F – JUNE 1992 – REVISED MAY 1997 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description These 36-bit UBTs combine D-type latches and D-type flip-flops to allow data flow in transparent, latched, and clocked modes. Data flow in each direction is controlled by output-enable (OEAB and OEBA), latch-enable (LEAB and LEBA), and clock (CLKAB and CLKBA) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A data is latched if CLKAB is held at a high or low logic level. If LEAB is low, the A data is stored in the latch/flip-flop on the low-to-high transition of CLKAB. Data flow for B to A is similar to that of A to B, but uses OEBA, LEBA, and CLKBA. Output-enable OEAB is active high. When OEAB is high, the outputs are active. When OEAB is low, the outputs are in the high-impedance state. The output enables are complementary (OEAB is active high, and OEBA is active low). When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, OE should be tied to VCC through a pullup resistor and OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sinking/current-sourcing capability of the driver. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. The SN54ABTH32501 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74ABTH32501 is characterized for operation from –40 °C to 85°C. FUNCTION TABLE† INPUTS OUTPUT OEAB LEAB CLKAB A B L X X X Z H HX L L H HX H H H L ↑ LL H L ↑ HH H LH X B0‡ H L L X B0§ † A-to-B data flow is shown: B-to-A flow is similar, but uses OEBA, LEBA, and CLKBA. ‡ Output level before the indicated steady-state input conditions were established § Output level before the indicated steady-state input conditions were established, provided that CLKAB was low before LEAB went low |
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