NTE1857 Datasheet, PDF (1/6 Pages) NTE Electronics – Integrated Circuit Stepper Motor Driver

NTE1857
Integrated Circuit
Stepper Motor Driver
Description:
The NTE1857 is designed to drive a two–phase stepper motor in the bipolar mode, The circuit of four
input sections, a logic decoding/sequencing section, two driver–stages for the motor coils, and an out-
put to indicate the Phase A drive state.
Features:
D Single Supply Operation: +7.2V to +16.5V
D 350mA/Coil Drive Capability
D Clamp Diodes Provided for Back–EMF
Suppression
D Selectable CW/CCW and Full/Half Step
Operation
D Selectable High/Low Output Impedance
(Half Step Mode)
D TTL/CMOS Compatible Inputs
D Input Hysteresis: 400mV Min
D Phase Logic Can Be Initialized to Phase A
D Phase A Output Drive State Indication
(Open–Collector)
Input Truth Table:
Input Low Input High
CW/CCW
CW
CCW
Full/Half Step Full Step
Half Step
OIC
Hi Z
Low Z
Clk
Positive Edge Triggered
Absolute Maximum Ratings: (Note 1)
Supply Voltage, V_M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V
Clamp Diode Cathode Voltage (Pin1), V_D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_M +5.0V
Driver Output Voltage (Pins 2, 3, 14, 15), V_OD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_M +6.0V
Driver Output Current/Coil, I_OD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±500mA
Input Voltage (Pins 7, 8, 9, 10), V_in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 to +7.0V
Bias/Set Current (Pin6), I_BS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10mA
Phase A Output Voltage (Pin11), V_OA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V
Phase A Sink Current (Pin11), I_OA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Junction Temperature, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Thermal Resistance, Junction–to–Ambient (No Heat Sink), R_thJA . . . . . . . . . . . . . . . . . . . . . 45°C/W
Note 1. “Maximum Ratings” are those values beyond which the safety of the device cannot be guar-
anteed. They are not meant to imply that the devices should be operated at these limits.
The “Electrical Characteristics” tables provide conditions for actual device operation.