Pacific Scientific OC950 - Page 40

OC950
Bi-Directional I/O
Channel
A schematic diagram of a single OCIO channel is shown below.
MA950 3-15
+5V
50V
20V
74AC14
Vmin=3.5V
IH
Vmax=1.0V
IL
Vds clamp = 50V
Imax = 100mA
Rds on =
5.0 Ohms typical
9.5 Ohms maximum
@ 125 Deg C
Imax = 100mA
INPUT
(SENSE)
OUTPUT
(CONTROL)
TO MPU
470PF
220K
1N914B
GNDIO
TPIC6B273
(Output Stage)
10K
OCIO
I/O RETURN
+12V