11
V
CC1
(+5 V)
619
Ω
D.U.T.
V
CC
4.02 KΩ
DATA
INPUT
TTL OR
LSTTL
OPEN
COLLECTOR
GATE
GND
Figure 12. Series LED Drive with Open Collector Gate
(4.02 k
Ω
Resistor Shunts I
OH
from the LED).
V
CC2
(+5 V)
DATA
OUTPUT
V
CC1
(+5 V)
665
Ω
665
Ω
D.U.T.
V
CC
DATA
INPUT
TTL OR
LSTTL
UP TO 16 LSTTL
LOADS
OR 4 TTL LOADS
0.1
µF
DATA
OUTPUT
TOTEM
POLE
OUTPUT
GATE
DATA
INPUT
1
TTL OR
LSTTL
GND
TOTEM
POLE
OUTPUT
GATE
UP TO 16 LSTTL
LOADS
OR 4 TTL LOADS
1
2
Figure 13. Recommended LSTTL to LSTTL Circuit.
V
CC
+ 20 V
D.U.T.*
I
F
+
–
100
Ω
V
CC
I
O
V
E
GND
1200
Ω
0.01 µF
V
IN
1.90 V
CONDITIONS: I
F
= 8 mA
I
O
= -14 mA
T
A
= +125 °C
*ALL CHANNELS TESTED SIMULTANEOUSLY.
Figure 14. Single Channel Operating Circuit for Burn-in and Steady State Life Tests.