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The L293 and L293D are quadruple high-current half-H drivers. The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V.

The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V. Both devices are designed to drive inductive loads such as relays, solenoids, dc and bipolar stepping motors, as well as other high-current/high-voltage loads in positive-supply applications. All inputs are TTL compatible. Each output is a complete totem-pole drive circuit, with a Darlington transistor sink and a pseudo-Darlington source. Drivers are enabled in pairs, with drivers 1 and 2 enabled by 1,2EN and drivers 3 and 4 enabled by 3,4EN. When an enable input is high, the associated drivers are enabled and their outputs are active and in phase w ith their inputs. When the enable input is low, those drivers are disabled and their outputs are off and in the high-impedance state.

With the proper data inputs, each pair of drivers forms a full-H (or bridge) reversible drive suitable for solenoid or motor applications. On the L293, external high-speed output clamp diodes should be used for inductive transient suppression.

L293, L293D QUADRUPLE HALF-H DRIVERS SLRS008B – SEPTEMBER 1986 – REVISED JUNE 2002. Each output is a complete totem-pole drive circuit, with a Darlington transistor. Two-Phase Motor Driver (L293D) L293, L293D QUADRUPLE HALF-H DRIVERS SLRS008B – SEPTEMBER 1986 – REVISED JUNE 2002.