XRK49911 Datasheet, PDF (9/12 Pages) Exar Corporation – 3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

xr
REV. 1.0.1
XRK49911
3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
SWITCHING CHARACTERISTICS OVER THE 3.3V + 10% OPERATING RANGE ^[2,9]
SYMBOL
DESCRIPTION
XRK49911-2
XRK49911-5
XRK49911-7
UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
t_RPWH CLKIN Pulse Width HIGH
4
4
4
ns
t_RPWL CLKIN Pulse Width LOW
4
4
4
ns
t_u
Programmable Skew Unit
See Table 1
t_SKEWPR Zero Output Matched-Pair Skew
(Qx[1:0]) ^{[10, 11]}
0.05 0.2
0.1 0.25
0.1 0.25 ns
t_{SKEW0 Zero Output Skew (All Outputs)} ^{[10, 12]}
0.1 0.25
0.25 0.5
0.3 0.75 ns
t_SKEW1 Output Skew (Rise-Rise, Fall-Fall,
Same Class Outputs) ^{[10, 13]}
0.25 0.5
0.6 0.7
0.6 1 ns
t_SKEW2 Output Skew (Rise-Fall, Nominal-
Inverted, Divided-Divided) ^{[10, 13]}
0.3 1
0.5 1
1 1.5 ns
t_SKEW3 Output Skew (Rise-Rise, Fall-Fall,
Different Class Outputs) ^{[10, 13]}
0.25 0.5
0.5 0.7
0.7 1.2 ns
t_SKEW4 Output Skew (Rise-Fall, Nominal-
Divided, Divided-Inverted ^{[10, 13]}
0.5 0.9
0.5 1
1.2 1.7 ns
t_{DEV Device-to-Device Skew} ^{[14, 15]}
0.75
1.25
1.65 ns
t_PD Propagation Delay, CLKIN Rise to
FB_IN Rise
-0.25 0 0.25 -0.5 0 0.5 -0.7 0 0.7 ns
t_{ODCV Output Duty Cycle Variation} ^[16]
-0.65 0 0.65 -1 0 1 -1.2 0 1.2 ns
t_PWH Output HIGH Time Deviation from 50%
[17]
2.0
2.5
3 ns
t_PWL Output LOW Time Deviation from 50%
1.5
3
3.5 ns
[17]
t_{ORISE Output Rise Time} ^{[17, 18]}
0.15 1 1.2 0.15 1 1.5 0.15 1.5 2.5 ns
t_{OFALL Output Fall Time} ^{[17, 18]}
0.15 1 1.2 0.15 1 1.5 0.15 1.5 2.5 ns
t_{LOCK PLL Lock Time} ^[19]
0.5
0.5
0.5 ms
t_JR Cycle-to-Cycle Output _RMS ^[14]
Jitter
Peak-to-Peak
[14]
25
25
25 ps
200
200
200
NOTES:
9. Test measurement levels for the XRK49911 are TTL levels (1.5V to 1.5V). Test conditions assume signal transition
times of 2 ns or less and output loading as shown in the AC Test Loads and Waveforms unless otherwise
specified.
10. SKEW is defined as the time between the earliest and the latest output transition among all outputs for which the
same t_U delay has been selected when all are loaded with 30pF and terminated with 50Ω to V_CC/2.
9