XLi Time & Frequency System
205
XLi-man, Issue 8, 6/17/2008, Rev. H
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ERROR ALL PINS LOW (Less than First Threshold)
When time is again synchronized, the time quality lines will again go low as the unit re-corrects to the
proper time. At initial turn-on or after a power failure, the time quality lines will remain in the high state
until the clock has synchronized. The time quality lines can, therefore, be used as read-inhibit lines to
guarantee a given timing accuracy.
1 PPS, 1 KPPS AND 1 MPPS STROBE LINES
Both 1 PPS and 1 KPPS strobe lines on the 50-pin output connector and the 1 MPPS strobe line
on the 25-pin connector indicate valid BCD time data.
The 1 PPS 50% duty cycle output line on Pin 16 of the 50-pin connector switches to the high state
100ns after the second strobe. This allows the user to use the rising edge of this strobe to clock data into
a remote system. The 100 ns delay allows for the output register time delay plus the user's interface
setup-time requirements. At any time the 1 PPS strobe line is high, the data lines from seconds up will
not be changing states and are therefore available for reading.
The 1 kPPS 50% duty cycle output line on pin 9 of the 50-pin connector switches to the high state 100 ns
after the millisecond strobe. The 100 ns nominal delay allows for the output register time delay plus the
user's interface set up time requirements. At any time the 1 KPPS line is high, the data lines from
milliseconds up will not be changing states and are therefore available for reading.
The 1 MPPS 50% duty cycle output line on pin 24 of the 25-pin connector switches to the high state 100
ns after the millisecond strobe. The 100 ns nominal delay allows for the output register time delay plus
the user's interface set up time requirements. At any time the 1 MPPS line is high, the data lines from
usec up will not be changing states and are therefore available for reading.
Parallel BCD mSec Output with Unlock Status (87-8090-2)
This Parallel BCD module provides provides 42 lines of parallel BCD time data representing 100's of
days to units of milliseconds, two data valid strobes, and an unlock line Unlock which indicates when the
XLi is unlocked from the selected reference source.
OUTPUT
Day of year, hours, minutes, seconds, and milliseconds.
Outputs (TTL):
LVTTL Levels, 4mA source or sink
Logic Low < 0.4 V
Logic High > 2.4 V
Qty:
1
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