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V
IH
CLK
V
IL
V
IH
GATE
V
IL
V
OH
OUT
V
OL
Connecting the Power
Caution
Do not directly connect this +5 V power pin to analog or digital ground or to any
other voltage source on the DAQCard-1200 or any other device. Doing so can damage the
DAQCard-1200 or the PC. NI is not liable for any damage due to incorrect power
connections.
© National Instruments Corporation
t
sc
t
gsu
t
gwh
t
outg
t
clock period
sc
t
clock high level
pwh
t
clock low level
pwl
t
gate setup time
gsu
t
gate hold time
gh
t
gate high level
gwh
t
gate low level
gwl
t
output delay from clock
outg
t
output delay from gate
outc
Figure 3-20. General-Purpose Timing Signals
The GATE and OUT signals in Figure 3-20 are referenced to the rising edge
of the CLK signal.
Pin 49 of the I/O connector supplies +5 V from the DAQCard-1200 power
supply. This pin is referenced to DGND. You can use the +5 V to power
external digital circuitry.
•
Power rating
t
pwh
t
gh
380 ns min
230 ns min
150 ns min
100 ns min
50 ns min
150 ns min
100 ns min
300 ns max
400 ns max
250 mA at +5 V maximum, fused to 1 A
3-31
Chapter 3
Connecting the Signals
t
pwl
t
gwl
t
outc
DAQCard-1200 User Manual
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