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SN74FB2033ARCR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74FB2033ARCR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page SN74FB2033A 8-BIT TTL/BTL REGISTERED TRANSCEIVER SCBS174M – NOVEMBER 1991 – REVISED SEPTEMBER 2001 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) Data flow in the B-to-A direction, regardless of the logic element selected, is further controlled by the LOOPBACK input. When LOOPBACK is low, B-port data is the B-to-A input. When LOOPBACK is high, the output of the selected A-to-B logic element (prior to inversion) is the B-to-A input. The AO port-enable/-disable control is provided by OEA. When OEA is low or when VCC is less than 2.5 V, the AO port is in the high-impedance state. When OEA is high, the AO port is active (high or low logic levels). The B port is controlled by OEB and OEB. If OEB is low, OEB is high, or VCC is less than 2.5 V, the B port is inactive. If OEB is high and OEB is low, the B port is active. BG VCC and BG GND are the bias-generator reference inputs. The A-to-B and B-to-A logic elements are active, regardless of the state of their associated outputs. The logic elements can enter new data (in flip-flop and latch modes) or retain previously stored data while the associated outputs are in the high-impedance (AO port) or inactive (B port) states. Output clamps are provided on the BTL outputs to reduce switching noise. One clamp reduces inductive ringing effects on VOH during a low-to-high transition. The other clamps out ringing below the BTL VOL voltage of 0.75 V. Both clamps are active only during ac switching and do not affect the BTL outputs during steady-state conditions. BIAS VCC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when VCC is not connected. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING 0 °C to 70°C QFP – RC Tube SN74FB2033ARC FB2033A † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. |
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