7-BIT TTL/BTL TRANSCEIVER
D Compatible With IEEE Std 1194.1-1991
D TTL A Port, Backplane Transceiver Logic
(BTL) B Port
D Open-Collector B-Port Outputs Sink
D BIAS VCC Pin Minimizes Signal Distortion
During Live Insertion or Withdrawal
SCBS172M – NOVEMBER 1991 – REVISED MARCH 2002
D High-Impedance State During Power Up
and Power Down
D B-Port Biasing Network Preconditions the
Connector and PC Trace to the BTL
D TTL-Input Structures Incorporate Active
Clamping to Aid in Line Termination
52 51 50 49 48 47 46 45 44 43 42 41 40
14 15 16 17 18 19 20 21 22 23 24 25 26
The SN74FB2041A is a 7-bit transceiver designed to translate signals between TTL and backplane transceiver
logic (BTL) environments. The device is 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 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 enable/disable logic partitions the device as two 3-bit sections and one
The A port operates at TTL signal levels and has split 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.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
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testing of all parameters.
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