[Digital Engineering, Inc.}

The EDE1204 Bi-Polar Stepper Motor IC is a 5 volt, 18 pin package designed to control a Bi-Polar (4 wire) stepper motor. The EDE1204 is capable of self-clocking in the free-standing RUN mode, as well as external clocking in the STEP mode. In addition, half-stepping and directional control are also available. The TTL-level outputs sequence dual H-Bridges (one per coil) such as the L293 Dual H-Bridge IC or dual H-Bridges made from discrete transistors (see schematics section). The EDE1204 features the ability to change the stepping rate while the motor is stepping and to self clock an unlimited number of steps in continuous RUN mode. Inputs are TTL/ CMOS compatible.