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SN74FB1650PCA Fiches technique(PDF) 2 Page - Texas Instruments |
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SN74FB1650PCA Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 10 page SN74FB1650 18BIT TTL/BTL UNIVERSAL STORAGE TRANSCEIVER SCBS178O − AUGUST 1992 − REVISED MARCH 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information The SN74FB1650 contains two 9-bit transceivers designed to translate signals between TTL and backplane transceiver-logic (BTL) environments. The device is designed specifically to be compatible with IEEE Std 1194.1-1991. The B port operates at BTL-signal levels. The open-collector B ports are specified to sink 100 mA. Two output enables (OEB and OEB) are provided for the B outputs. When OEB is low, OEB is high, or VCC is less than 2.1 V, the B port is turned off. The A port operates at TTL-signal levels. The A outputs reflect the inverse of the data at the B port when the A-port output enable (OEA) is high. When OEA is low or when VCC is less than 2.1 V, the A outputs are in the high-impedance state. BIAS VCC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when VCC is not connected. BG VCC and BG GND are the supply inputs for the bias generator. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING 0 °C to 70°C TQFP − PCA Tube SN74FB1650PCA FB1650 † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Function Tables TRANSCEIVER INPUTS FUNCTION OEA OEA OEB OEB FUNCTION X X H L A data to B bus L HX X B data to A bus L HH L A data to B bus, B data to A bus X X L X B-bus isolation X XX H B-bus isolation H X X X A-bus isolation X L X X A-bus isolation STORAGE MODE INPUTS FUNCTION LE CLK FUNCTION H X Transparent L ↑ Store data L L Storage |
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