©
National Instruments Corp.
15
NI 9421/9423
I/O protection
Inp
u
t voltage
NI 9421 ................................ 40 V max
NI 9423 ................................ 35 V max
Reverse-biased voltage ............... –30 V max
Inp
u
t c
u
rrent
NI 9421 ................................ 7 mA max,
internally limited
NI 9423 ................................ 8.5 mA max,
internally limited
Inp
u
t delay time
NI 9421....................................... 100
μ
s max
NI 9423....................................... 1
μ
s max
MTBF
NI 9421....................................... 2,086,204 ho
u
rs at 25 °C;
Bellcore Iss
u
e 2, Method 1,
Case 3, Limited Part Stress
Method
