ICS954204 Datasheet, PDF (7/16 Pages) Integrated Circuit Systems – Programmable Timing Control HubTM for Mobile P4TM Systems

Integrated
Circuit
Systems, Inc.
ICS954204
Electrical Characteristics - CPU 0.7V Current Mode Differential Pair
T_A = 0 - 70°C; V_DD = 3.3 V +/-5%; C_L =2pF, R_S=33.2Ω, R_P=49.9Ω, Ι_REF = 475Ω
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
Current Source Output
Impedance
Zo
V_O = V_x
3000
Voltage High
Voltage Low
VHigh
Statistical measurement on single
660
750
850
ended signal using oscilloscope
VLow
math function.
-150
0
150
Max Voltage
Vovs
Measurement on single ended
790
1150
Min Voltage
Vuds
signal using absolute value.
-300
0
Crossing Voltage (abs) Vcross(abs)
250
390
550
Crossing Voltage (var)
d-Vcross
Variation of crossing over all
edges
50
140
Long Accuracy
ppm
see Tperiod min-max values
-300
300
400MHz non-spread
2.4993
2.5008
400MHz spread
2.4993
2.5133
333.33MHz non-spread
2.9991
3.0009
333.33MHz spread
2.9991
3.016
266.66MHz non-spread
3.7489
3.7511
266.66MHz spread
3.7489
3.77
Average period
T_period
200MHz non-spread
200MHz spread
4.9985
4.9985
5.0015
5.0266
166.66MHz non-spread
5.9982
6.0018
166.66MHz spread
5.9982
6.0320
133.33MHz non-spread
7.4978
7.5023
133.33MHz spread
7.4978
5.4000
100.00MHz non-spread
9.9970
10.0030
100.00MHz spread
9.9970
10.0533
400MHz non-spread
400MHz spread
2.4143
2.5750
2.5983
333.33MHz non-spread
333.33MHz spread
2.9141
3.0859
3.1010
266.66MHz non-spread
266.66MHz spread
3.6639
3.8361
3.8550
Absolute min/max period
T_abs
200MHz non-spread
200MHz spread
4.9135
5.0865
5.1116
166.66MHz non-spread
166.66MHz spread
5.9132
6.0868
6.1170
133.33MHz non-spread
133.33MHz spread
7.4128
7.5873
7.6250
100.00MHz non-spread
100.00MHz spread
9.9120
10.0880
10.1383
Rise Time
t_r
V_OL = 0.175V, V_OH = 0.525V
175
310
700
Fall Time
t_f
V_OH = 0.525V V_OL = 0.175V
175
305
700
Rise Time Variation
d-t_r
20
125
Fall Time Variation
d-t_f
15
125
Duty Cycle
d_t3
Measurement from differential
wavefrom
45
50
55
Skew
t_sk3
CPU(1:0), V_T = 50%
CPU2_ITP, V_T = 50%
20
100
90
150
Jitter, Cycle to cycle
t_jcyc-cyc
Differential waveform
measurement, CPU(1:0)
35
85
Jitter, Cycle to cycle
t_jcyc-cyc
Differential waveform
measurement, CPU2_ITP
45
125
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.}
UNITS
Ω
NOTES
1
1,3
mV
1,3
mV
1
1
mV
1
mV
1
ppm
1,2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ns
1,2
ps
1
ps
1
ps
1
ps
1
%
1
ps
1
ps
1
ps
1
ps
1
0933D—03/16/05
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