SN54FB2031, SN74FB2031 9-BIT TTL/BTL ADDRESS/DATA TRANSCEIVERS

SCBS176H - NOVEMBER 1991 - REVISED JUNE 1997

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features

Compatible With IEEE Std 1194.1-1991 (BTL)
TTL A Port, Backplane Transceiver Logic (BTL) B\ Port
Open-Collector B\-Port Outputs Sink 100 mA
Isolated Logic-Ground and Bus-Ground Pins Reduce Noise
High-Impedance State During Power Up and Power Down
BIAS V_CC Minimizes Signal Distortion During Live Insertion or Withdrawal
B\-Port Biasing Network Preconditions the Connector and PC Trace to the BTL High-Level Voltage
TTL-Input Structures Incorporate Active Clamping to Aid in Line Termination
Package Options Include Plastic Quad Flat (RC) Package and Ceramic Flat (WD) Package

description

The 'FB2031 are 9-bit transceivers designed to translate signals between TTL and backplane transceiver logic (BTL) environments. They are specifically designed 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 V_CC 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 V_CC is less than 2.1 V, the A outputs are in the high-impedance state.

Pins are allocated for the 4-wire IEEE Std 1149.1 (JTAG) test bus. TMS and TCK are not connected and TDI is shorted to TDO.

BIAS V_CC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when V_CC is not connected.

BG V_CC and BG GND are the supply inputs for the bias generator.

To ensure the high-impedance state during power up or power down, the A port should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54FB2031 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74FB2031 is characterized for operation from 0°C to 70°C.

Title: 9-BIT TTL/BTL ADDRESS/DATA TRANSCEIVERS
Product Family: UNIVERSAL BUS TRANSCEIVERS (UBTS)
Device Functionality: BUS TRANSCEIVER
Orderable Devices: SNJ54FB2031WD, SN74FB2031RC

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View more information about generic part numbers:SN54FB2031, SN74FB2031

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