NTE1857 Datasheet, PDF (3/6 Pages) NTE Electronics – Integrated Circuit Stepper Motor Driver

DC Electrical Characteristics (Cont’d): (Specifications apply over the recommended supply
voltage and temperature ranges unless otherwise spe–
cified, See Notes 2, 3)
Parameter
Pins Symbol
Test Conditions
Min Typ Max Unit
Phase A Output
Output Low Voltage
Off State Leakage Current
Power Supply
11 V_OLA I_OA = 8mA
I_OHA V_OHA = 16.5V
– – 0.4 V
– – 100 µA
Power Supply Current
Bias/Set Current
16
I_MW I_OD = 0µA,
L3 = V_OHD, L4 = V_OLD –
– 70 mA
I_MZ
I_BS = –300µA,
L1 = V_OHD,
L3 = HiZ, L4 = HiZ
– – 40 mA
I_MN ^{L2 = V}_OLD
L3 = V_OHD, L4 = V_OLD –
– 75 mA
To Set Phase A
6
I_BS
–5.0 – – µA
Note 2. Algebraic convention rather than absolute values is used to designate limit values.
Note 3. Current into a pin is designated as positive. Current out of a pin is designated as negative.
AC Switching Characteristics: (T_A = +25°C, V_M = 12V unless otherwise specified)
Parameter
Pins Symbol Test Conditions Min Typ Max Unit
Clock Frequency
Clock Pulse Width – High
Clock Pulse Width – Low
Bias/Set Pulse Width
Setup Time – CW/CCW and F/HS
Hold Time – CW/CCW and F/HS
Propagation Delay – Clk–to–Driver Output
Propagation Delay – Bias/Set–to–Driver Output
Propagation Delay – Clk–to–Phase A Low
Propagation Delay – Clk–to–Phase A High
7
7
7
6
10–7, 9–7
10–7, 9–7
7–11
7–11
f_CK
PW_CKH
PW_CKL
PW_BS
t_su
t_h
t_PCD
t_PBSD
t_PHLA
t_PLHA
0 – 50 kHz
10 – – µs
10 – – µs
10 – – µs
5 – – µs
10 – – µs
– 8 – µs
– 1 – µs
– 12 – µs
– 5 – µs
Pin Description:
Name
Power Supply
Ground
Clamp Diode
Voltage
Driver Outputs
Bias/Set
Clock
Symbol
V_M
GND
V_D
L1, L2,
L3, L4
B/S
Clk
Pin #
16
4, 5,
12, 13
1
2, 3,
14, 15
6
7
Description
Power supply pin for both the logic circuit and the motor coil current. Volt-
age is +7.2 to +16.5V.
Ground pins for the logic circuit and the motor coil current. The physical
configuration of the pins aids in dissipating heat from within the IC pack-
age.
This pin is used to protect the outputs where large voltage spikes may oc-
cur as the motor coils are switched. Typically a diode is connected be-
tween this pin and Pin16.
High current outputs for the motor coils. L1 and L2 are connected to one
coil, and L3 and L4 to the other coil.
This pin is typically 0.7 below V_M. The current out of this pin (through a
resistor to GND) determines the maximum output sink current. If the pin
is opened (I_BS < 5.0µA) the outputs assume a high impedance condition,
while the internal logic presets to a Phase A condition.
The positive edge of the clock input switches the outputs to the next posi-
tion. This input has no effect if Pin6 is open.