The SN74FB1653 contains an 8-bit and a 9-bit transceiver with a buffered clock. The clock and transceivers are designed to translate signals between LVTTL and BTL environments. The device is designed specifically to be compatible with IEEE Std 1194.1-1991 (BTL).

The A port operates at LVTTL 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 when V_CC(5 V) typically is less than 2.5 V, the A outputs are in the high-impedance state.

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(5 V) typically is less than 2.