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SN74FB2040RC Folha de dados(PDF) 1 Page - Texas Instruments |
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SN74FB2040RC Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 9 page SN74FB2040 8-BIT TTL/BTL TRANSCEIVER SCBS173N – NOVEMBER 1991 – REVISED MARCH 2002 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Compatible With IEEE Std 1194.1-1991 (BTL) D TTL A Port, Backplane Transceiver Logic (BTL) B Port D Open-Collector B-Port Outputs Sink 100 mA D High-Impedance State During Power Up and Power Down D BIAS VCC Pin Minimizes Signal Distortion During Live Insertion or Withdrawal D B-Port Biasing Network Preconditions the Connector and PC Trace to the BTL High-Level Voltage RC PACKAGE (TOP VIEW) 14 15 16 17 18 19 20 21 22 23 24 25 26 52 51 50 49 48 47 46 45 44 43 42 41 40 GND AI2 AI3 AO3 GND AO4 GND AI4 AI5 AO5 GND AO6 GND GND B2 GND B3 GND B4 GND B5 GND B6 GND B7 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 39 38 37 36 35 34 33 32 31 30 29 28 27 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 mA. 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. Copyright 2002, Texas Instruments Incorporated 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. 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. |
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