H21LTB_04 Datasheet, PDF (8/9 Pages) Fairchild Semiconductor – OPTOLOGIC OPTICAL INTERRUPTER SWITCH

OPTOLOGIC^® OPTICAL
INTERRUPTER SWITCH
H21LTB
H21LTI
Figure 9. Switching Speed Test Circuit
C2
R2
Pulse
Generator
VO = 5V
f = 10 KHz
d.c. = 50%
5V
R1
.1 uf
bypass
C1
GND
R1 = 360 Ω
R2 = 180 Ω
C1 = 15 pf
C2 = 20 pf
C1and C2 include probe and
stray wire capacitance
H21LOB
H21LOI
Figure 10. Typical Operating Circuit
RIN
+
V- IN
VCC
RL
.1 uf
VO _bypass
clude probe and
apacitance
GND
Figure 11. Switching Times Definition for Buffers
50%
0 mA
t_PLH
V_OH
Output
V_O
t _PHL
90%
10%
50%
V_OL
t_r
10%
90%
t_f
Figure 12. Switching Times Definition for Inverters
50%
0 mA
t_PHL
t _PLH
V_OH
Output
V_O
10%
90%
90%
V_OL
t_f
10%
t_r
© 2004 Fairchild Semiconductor Corporation
Page 8 of 9
11/2/04