©
National Instruments Corporation
A-1
NI PCI-1588 User Manual
A
Specifications
Clock Signal Characteristics
Output frequency.................................... DC to 1 Mhz
1
Duty cycle .............................................. Programmable
PFI <0..2>
Input Characteristics
Input impedance ..................................... 1 k
Ω
, nominal
Input coupling ........................................ DC
Voltage level .......................................... 0 to +3.3 V, +5 V tolerant
Absolute maximum input voltage
2
......... –0.5 V to 6.0 V
Minimum pulse width ............................ 36 ns
Input threshold
Voltage threshold high.................... +2.3 V
Voltage threshold low ..................... +0.8 V
Asynchronous delay, t
pd
PFI <0..2> to timestamp ................. 1 to 4 ns, typical
Output Characteristics
Output impedance .................................. 50
Ω
, nominal
Output coupling...................................... DC
1
Both upper and lower limits must be multiples of the nominal update period of the 1588 system time. Refer to the
NI-Sync
User Manual
for details.
2
Stresses beyond those listed can cause permanent damage to the device. Exposure to absolute maximum rated conditions for
extended periods of time can affect device reliability. Functional operation of the device outside the conditions indicated in
the operational parts of the specifications is not implied.
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