Differential line drivers

13 June 2012 Analogue, Mixed Signal, LSI

The LS7272/LS7273 from LSI/CSI are short circuit-proof quad differential industrial power line drivers. They can operate up to 30 V and have a selectable thermal shutdown feature.

The data inputs are TTL/CMOS compatible and can be a driver up to the supply voltage. An input can be used to place all the outputs in a high-impedance state, while another input on the 7272 is used to connect the outputs as push-pull drivers or open-drain drivers, where the outputs can be returned through external loads to a maximum of the supply voltage. For the 7273, this pin is tied to ground; the outputs are open-drain and the loads can be returned to any voltage between 4,5 V and 30 V independent of the supply voltage.

An internal 5 V regulated supply is used to power the logic and level converter blocks. Upon power-up, a power-on-reset (POR) circuit block forces all output drivers to the high-impedance state until the power supply voltage reaches a nominal 3,8 V. Included in the POR circuit block is an hysteresis of 100 mV such that if the power supply drops below 3,7 V all output drivers are forced to the high-impedance state until the voltage rises above 3,8 V.

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