SN74FB2040 Datasheet | Texas Instruments

description The SN74FB2040 is an 8-bit transceiver designed to translate signals between TTL and backplane transceiver logic (BTL) environments. The B port operates at BTL-signal levels. The open-collector B ports are specified to sink 100 m A. Two output enables (OEB and OEB) are provided for the B outputs. When OEB is high and OEB is low, the B port is active and reflects the inverse of the data present at the A-input pins. 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 and has separate input and output pins. 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. The pins TMS, TCK, TDI, and TDO are nonfunctional, i.e., not intended for use with the IEEE Std 1149.1 (JTAG) test bus. TMS and TCK are not connected, and TDI is shorted to TDO. BIAS VCC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when VCC is not connected. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. - POST OFFICE BOX 655303 DALLAS, TEXAS 75265 Copyright  2002, Texas Instruments Incorporated 1 SN74FB2040 8-BIT TTL/BTL TRANSCEIVER SCBS173N - NOVEMBER 1991 - REVISED MARCH 2002 ORDERING INFORMATION PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING 0°C to 70°C QFP - RC Tube SN74FB2040RC FB2040 † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at .ti./sc/package. FUNCTION...