ISTS970N, ISTS971N
ISTS970T, ISTS971T
ISO - LOGIC BUFFER
SCHMITT TRIGGER
INTERRUPTER SWITCH
Dimensions in mm
DESCRIPTION
ISTS970N
ISTS971N
5
4
E
The ISTS970 and ISTS971 series of
transmissive photointerrupters are single channel
1
switches consisting of a Gallium Arsenide
2
infrared emitting diode coupled to a high speed
integrated circuit detector. The output
incorporates a Schmitt trigger which provides
hysteresis for noise immunity and pulse shaping.
The gap in the plastic housing provides a means
of interrupting the signal with an opaque
9.0
material, switching the output from an 'OFF' into
8.0
an 'ON' state.
FEATURES
l
Output high under incident light
l
Built in Schmitt trigger circuit
l
Pull up resistor between V
CC
and output
(ISTS970)
l
Open collector output (ISTS971)
l
High sensitivity
l
3mm gap between LED and detector
l
1mm aperture over detector
APPLICATIONS
l
pin 3 V
CC
2
1
6.6
pin 4 V
O
pin 5 G
ND
3.3
3.0
2.8
11.1
10.5
OPTICAL
CENTRE
LINE
2.54
3
3.0
12.7
0.45
0.40
7.62
ISTS970T
ISTS971T
Floppy disk drives, Copiers, Printers,
Facsimilies, VCR's, Cassette tape
Recorders, Automatic vending machines
1
25.7
24.1
19.05
E
5
2
1
pin 3 V
CC
pin 4 V
O
Voltage Regulator
2
12.7
3.0
4
3
6.6
2
10kΩ
3 V
CC
ISTS970
only
4 Out
9.0
8.0
pin 5 G
ND
3.3
3.0
2.8
11.1
10.5
OPTIC AL
CENTRE
LINE
2.54
0.45
0.40
7.62
1
Amp
5 G
ND
ISOCOM COMPONENTS LTD
Unit 25B, Park View Road West,
Park View Industrial Estate, Brenda Road
Hartlepool, Cleveland, TS25 1YD
Tel: (01429) 863609 Fax :(01429) 863581
3/10/97
ISOCOM INC
720 E., Park Boulevard, Suite 104,
Plano, TX 75074 USA
Tel: (972) 423-5521
Fax: (972) 422-4549
DB92072-AAS/A2
ABSOLUTE MAXIMUM RATINGS (25°C unless
otherwise specified)
Storage Temperature
Operating Temperature
Lead Soldering Temperature
(5 secs maximum)
INFRARED EMITTING DIODE
Power Dissipation
Forward Current ( Continuous )
Forward Current ( Peak )
(Pulse Width
≤
100µs, Duty Ratio = 0.01)
Reverse Voltage
PHOTO DETECTOR
Power Dissipation
Output Current
Allowed Range V
35
(ISTS970)
(ISTS971)
Allowed Range V
45
(ISTS970)
(ISTS971)
250 mW
50mA
0 to 17V
0 to 35V
0 to 17V
0 to 40V
75 mW
50 mA
1A
6V
-40°C to +85°C
-25°C to +85°C
260°C
ELECTRICAL CHARACTERISTICS ( T
A
= 25°C Unless otherwise noted )
PARAMETER
Input
Forward Voltage (V
F
)
Reverse Voltage (V
R
)
Reverse Current (I
R
)
Operating Voltage Range V
CC
Low Level Supply Current I
CCL
High Level Supply Current I
CCH
Low Level Output Voltage V
OL
High Level Output Voltage V
OH
ISTS970
High Level Output Current I
OH
ISTS971
Input Forward Threshold Current I
FT
Propagation Delay Time
to Logic High at Output
Propagation Delay Time
to Logic Low at Output
Rise Time
Fall Time
t
PLH
t
PHL
tr
tf
5
5
0.1
0.05
2.4
100
15
MIN TYP MAX UNITS
1.1
6
10
4.75
2.0
1.0
5.25
15
15
0.4
1.7
V
V
µA
V
mA
mA
V
V
µA
mA
µs
µs
µs
µs
V
CC
= 5V
I
F
= 15mA
R
L
= 360Ω (ISTS971)
or
R
L
= 8TTL Loads
(ISTS970)
V
CC
= 5.25V, I
F
= 0mA
V
CC
= 5.25V, I
F
= 15mA
V
CC
= 4.75V, I
F
= 0mA
I
OL
= 12.8mA
V
CC
= 4.75V, I
F
= 15mA
I
OH
= -800µA
V
CC
= 4.75V, I
F
= 15mA
V
OH
= 30V
V
CC
= 5V
TEST CONDITION
I
F
= 20mA
I
R
= 10µA
V
R
= 3V
Detector
Note 1
3/10/97
Special Selections are available on request. Please consult the factory.
DB92072-AAS/A2
Collector Power Dissipation vs. Ambient Temperature
300
Collector power dissipation P
C
(mW)
Low level output voltage V
OL
( V )
250
200
150
100
50
0
-25
0
25
50
75
100
125
Ambient temperature T
A
( °C )
Forward Current vs. Ambient Temperature
60
Rise time, fall time tr, tf (µs)
50
Forward current I
F
(mA)
40
30
20
10
0
-25
0
25
50
75
100
125
Ambient temperature T
A
( °C )
Supply Current vs.
Ambient Temperature
3.0
Supply current I
CC
(mA)
Low level output voltage V
OL
( V )
V
CC
= 5.25V
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-25
0
25
50
75
100
-25
0.6
0.5
0.4
0.3
1
0.5
0.2
0.1
0.05
0.02
0.01
1
Low Level Output Voltage vs.
Low Level Output Current
V
CC
= 4.75V
I
F
= 0mA
T
A
= 25°C
10
50
100
Low level output current I
OL
( mA )
Rise Time, Fall Time vs. Load
Resistance
V
CC
= 4.75V
I
F
= 15mA
T
A
= 25°C
tr
0.2
0.1
0
0.1
0.2
0.5
1
2
5
10
Load resistance R
L
( kΩ)
Low Level Output Voltage vs.
Ambient Temperature
V
CC
= 5.25V
I
F
= 0mA
tf
I
CCL
2.0
I
OL
= 30mA
16mA
5mA
1.0
I
CCH
0
Ambient temperature T
A
( °C )
0
25
50
75
100
Ambient temperature T
A
( °C )
DB92072-AAS/a2
3/10/97
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