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SN74FB2031 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74FB2031 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 13 page SN74FB2031 9-BIT TTL/BTL ADDRESS/DATA TRANSCEIVER SCBS176N – NOVEMBER 1991 – REVISED JUNE 2001 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 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 D TTL-Input Structures Incorporate Active Clamping to Aid in Line Termination 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 RC PACKAGE (TOP VIEW) GND A3 GND A4 GND A5 GND A6 GND A7 GND A8 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 SN74FB2031 is a 9-bit transceiver 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 VCC is less than 2.1 V, the A outputs are in the high-impedance state. Pins are allocated for the four-wire IEEE Std 1149.1 (JTAG) test bus, although currently there are no plans to release a JTAG-featured version. TMS and TCK are not connected and TDI is shorted to TDO. Copyright 2001, 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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