TSL238T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS080G DECEMBER 2007
2
r
r
Copyright E 2007, TAOS Inc.
The LUMENOLOGY r Company
www.taosinc.com
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
DD
(see Note 1)
6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
0.3 V to V
DD
+0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, I
O
?5 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short circuit of output to ground duration
5 s
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
(see Note 2)
40癈 to 85癈
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
(see Note 2)
40癈 to 85癈
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solder conditions in accordance with JEDEC, JSTD020C
260癈
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:  1.  All voltage values are with respect to GND.
2.  Long-term storage or operation above 70癈 could cause package yellowing that will lower the sensitivity to wavelengths < 500nm.
Recommended Operating Conditions
MIN
NOM
MAX
UNIT
Supply voltage, V
DD
2.7
5
5.5
V
High-level input voltage, V
IH
0.8 ?/SPAN> V
DD
V
DD
V
Low-level input voltage, V
IL
0
0.5
V
Operating free-air temperature range, T
A
40
70
癈
Electrical Characteristics at V
DD
= 5 V, T
A
= 25?/SPAN>C, ?/SPAN>p = 640 nm (Note 1) (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
OH
High-level output voltage
I
OH
= 1 mA
4
4.5
V
V
OL
Low-level output voltage
I
OL
= 1 mA
0.25
0.4
V
I
IH
High-level input current
10
10
糀
I
IH
Low-level input current
10
10
糀
I
DD
Supply current
E
e
= 14.7 糤/cm
2
2
3
mA
Full-scale frequency (Note 2)
T
A
= 50癈 (Note 3)
500
1000
kHz
Temperature coefficient of responsivity
Wavelength < 600nm, f
O
= 50 kHz
?00
ppm/癈
k
SVS
Supply-voltage sensitivity
V
DD
= 5 V ?0%
?.5
%/V
NOTES:  1.  The input irradiance is supplied with red LED light source with peak wavelength = 640 nm.
2.  Full-scale frequency is the maximum frequency of the device without saturation. Higher irradiance will not result in any additional
increase of output frequency. The output frequency will remain at approximately the saturation frequency to a minimum of 1000
糤/sqcm 640-nm irradiance. During production testing, devices are not tested at this very high irradiance level.
3.  Measured at wafer probe using 50癈 hot chuck.