SN54FB2040, SN74FB2040 8-BIT TTL/BTL TRANSCEIVERS

SCBS173G - 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 Pin Minimizes Signal Distortion During Live Insertion or Withdrawal
B\-Port Biasing Network Preconditions the Connector and PC Trace to the BTL High-Level Voltage
Package Options Include Plastic Quad Flat (RC) Package and Ceramic Flat (WD) Package

description

The 'FB2040 are 8-bit transceivers 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 V_CC 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 V_CC 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. Currently, 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.

The SN54FB2040 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74FB2040 is characterized for operation from 0°C to 70°C.

Title: 8-BIT TTL/BTL TRANSCEIVERS
Product Family: UNIVERSAL BUS TRANSCEIVERS (UBTS)
Device Functionality: BUS TRANSCEIVER
Orderable Devices: SNJ54FB2040WD, SN74FB2040RC

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View more information about generic part numbers:SN54FB2040, SN74FB2040

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