The L293D motor driver IC actually has two power input pins viz. ‘Vcc1’ and ‘Vcc2’. Vcc1 is used for driving the internal logic circuitry which should be 5V. From Vcc2 pin the H-Bridge gets its power for driving the motors which can be 4.5V to 36V. According to the L293 Datasheet, the Maximum Supply Voltage(VCC1)(supply for internal logic translation) is 36V. It is also mentioned that Max Input Voltage(V1)=7V whereas the Max High Level Input

SGS L293D Output Current 1 A Per Channel (600 mA for L293D) Peak Output Current 2 A Per Channel (1.2 A for L293D) Output Clamp Diodes for Inductive Transient Suppression (L293D) description/ordering information 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 ...