H21LTB_04 Datasheet, PDF (6/9 Pages) Fairchild Semiconductor – OPTOLOGIC OPTICAL INTERRUPTER SWITCH

OPTOLOGIC^® OPTICAL
INTERRUPTER SWITCH
H21LTB
H21LTI
Figure 1. Output Voltage
vs. Input Current (Inverters)
6
V_OH
5
V_CC = 5 V
R_L = 270 Ω
T_A = 25˚C
4
3
I_{F (OFF)}
I_{F (ON)}
2
1
V_OL
0
0
1
2
3
4
5
I_F - Input Current (mA)
H21LOB
H21LOI
Figure 2. Output Voltage vs. Input Current (Buffers)
6
V_CC = 5 V
R_L = 270 Ω
5 T_A = 25˚C
4
V_OH
3
I_{F (OFF)}
I_{F (ON)}
2
1
V_OL
0
0
1
2
3
4
5
I_F - Input Current (mA)
Figure 3. Normalized Threshold Current
vs. Shield Distance
10
Black Shield
Black Shield
d
+Dd
E+ ₀
0
Normalized to:
V_CC = 5 V
1
I_F = 20 mA Pulsed
Pulse Width = 100 µs
Duty Cycle = 0.1%
0
1
2
3
4
5
6
7
8
d - Distance (mm)
Figure 4. Normalized Threshold Current
vs. Supply Voltage
1.6
Normalized to:
1.4
Turn ON Threshold
V_CC = 5 V
T_A = 25˚C
1.2
1.0
I_{F (ON)}
0.8
I_{F (OFF)}
0.6
0.4
0.2
0.0
0
2
4
6
8
10
12
14
16
V_CC - Supply Voltage (V)
© 2004 Fairchild Semiconductor Corporation
Page 6 of 9
11/2/04