954226 Datasheet, PDF (16/22 Pages) Integrated Device Technology – Programmable Timing Control HubTM for Mobile P4TM Systems

954226
Programmable Timing Control Hub^TM for Mobile P4^TM Systems
Electrical Characteristics - CPUCLKT/C -- 0.7V Current Mode Differential Pair
PARAMETER
SYMBOL
CONDITIONS*
MIN TYP MAX UNITS
Current Source Output
Impedance
Voltage High
Voltage Low
Max Voltage
Min Voltage
Crossing Voltage (abs)
Crossing Voltage (var)
Long Accuracy
Average period
Absolute min period
Rise Time
Fall Time
Rise Time Variation
Fall Time Variation
Rise/Fall Matching
Duty Cycle
Zo
VO = Vx
3000
VHigh
VLow
Vovs
Vuds
Vx(abs)
d-Vx
ppm
Tperiod
Tabsmin
tr
tf
d-tr
d-tf
trfm
Statistical measurement on single
ended signal
Measurement on single ended signal
using absolute value.
Variation of crossing over all edges
see Tperiod min-max values
400MHz nominal
400MHz spread
333.33MHz nominal
333.33MHz spread
266.66MHz nominal
266.66MHz spread
200MHz nominal
200MHz spread
166.66MHz nominal
166.66MHz spread
133.33MHz nominal
133.33MHz spread
100.00MHz nominal
100.00MHz spread
400MHz nominal/spread
333.33MHz nominal/spread
266.66MHz nominal/spread
200MHz nominal/spread
166.66MHz nominal/spread
133.33MHz nominal/spread
100.00MHz nominal/spread
VOL = 0.175V, VOH = 0.525V
VOH = 0.525V VOL = 0.175V
VOL = 0.175V, VOH = 0.525V
VOH = 0.525V VOL = 0.175V
660
-150
-300
250
-300
2.4993
2.4993
2.9991
2.9991
3.7489
3.7489
4.9985
4.9985
5.9982
5.9982
7.4978
7.4978
9.9970
9.9970
2.4143
2.9141
3.6639
4.8735
5.8732
7.3728
9.8720
175
175
dt3 Measurement from differential wavefrom 45
Ω
850
mV
150
mV
1150 mV
mV
550
mV
140
mV
300
ppm
2.5008 ns
2.5133 ns
3.0009 ns
3.016
ns
3.7511 ns
3.77
ns
5.0015 ns
5.0266 ns
6.0018 ns
6.0320 ns
7.5023 ns
7.5400 ns
10.0030 ns
10.0533 ns
ns
ns
ns
ns
ns
ns
ns
700
ps
700
ps
125
ps
125
ps
20
%
55
%
Skew
tsk3
CPU(1:0), VT = 50%
100
ps
Skew
tsk4
CPU(1:0) to CPU2_ITP,
VT = 50%
150
ps
Jitter, Cycle to cycle tjcyc-cyc ^{Measurement from differential wavefrom}
(CPU2_ITP)
125
ps
Jitter, Cycle to cycle tjcyc-cyc
Measurement from differential
wavefrom, (CPU(1:0))
85
ps
*T_A = 0 - 70°C; V_DD = 3.3 V +/-5%; C_L =2pF, R_S=33.2Ω, R_P=49.9Ω, I_REF = 475Ω
1_{Guaranteed by design and characterization, not 100% tested in production.}
2 _{All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 14.31818MHz}
3_{IREF = VDD/(3xRR). For RR = 475Ω (1%), IREF = 2.32mA. IOH = 6 x IREF and VOH = 0.7V @ ZO=50Ω.}
Notes
1
1,3
1,3
1
1
1
1
1,2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1,2
1,2
1,2
1,2
1,2
1,2
1,2
1
1
1
1
1
1
1
1
1
1
IDT^® Programmable Timing Control Hub^TM for Mobile P4^TM Systems
16
0930A—04/13/10