Signal Connections
Chapter 3
AT-MIO-16 User Manual
3-24
© National Instruments Corporation
•
Am9513A digital output specifications (referenced to DIGGND):
–
V
OH
output logic high voltage
2.4 V min
–
V
OL
output logic low voltage
0.4 V max
–
I
OH
output source current, at V
OH
200
µ
A max
–
I
OL
output sink current, at V
OL
3.2 mA max
–
Output current, high-impedance state
±
25
µ
A max
Figure 3-18 shows the timing requirements for the GATE and SOURCE input signals and the
timing specifications for the OUT output signals of the Am9513A.
SOURCE
V
IH
V
IL
V
IH
V
IL
t
sc
t
sp
t
sp
t
gsu
t
gh
t
gw
GATE
t
out
OUT
V
OH
V
OL
sc
t
t
t
t
t
t
145 ns minimum
sp
70 ns minimum
gsu
100 ns minimum
gh
10 ns minimum
gw
145 ns minimum
out
300 ns maximum
Figure 3-18. General-Purpose Timing Signals
The GATE and OUT signal transitions in Figure 3-18 are referenced to the rising edge of the
SOURCE signal. This timing diagram assumes that the counters are programmed to count rising
edges. The same timing diagram, with the source signal inverted and referenced to the falling
edge of the source signal, applies to the case in which the counter is programmed to count falling
edges.
