NTE1857
Integrated Circuit
Stepper Motor Driver
Description:
The NTE1857 is designed to drive a two鈥損hase stepper motor in the bipolar mode, The circuit of four
input sections, a logic decoding/sequencing section, two driver鈥搒tages for the motor coils, and an out-
put to indicate the Phase A drive state.
Input Truth Table:
Features:
D
Single Supply Operation: +7.2V to +16.5V
Input Low
Input High
D
350mA/Coil Drive Capability
CW/CCW
CW
CCW
D
Clamp Diodes Provided for Back鈥揈MF
Full/Half Step
Full Step
Half Step
Suppression
D
Selectable CW/CCW and Full/Half Step
OIC
Hi Z
Low Z
Operation
Clk
Positive Edge Triggered
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鈥揅ollector)
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
鹵500mA
Input Voltage (Pins 7, 8, 9, 10), V
in
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.5 to +7.0V
Bias/Set Current (Pin6), I
BS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0mA
Phase A Output Voltage (Pin11), V
OA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V
Phase A Sink Current (Pin11), I
OA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Thermal Resistance, Junction鈥搕o鈥揂mbient (No Heat Sink), R
thJA
. . . . . . . . . . . . . . . . . . . . . 45擄C/W
Note 1. 鈥淢aximum Ratings鈥?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 鈥淓lectrical Characteristics鈥?tables provide conditions for actual device operation.
1
2
3
4
5
6
