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ICS9248-77 Datasheet, PDF (10/14 Pages) Integrated Circuit Systems – Frequency Timing Generator for PENTIUM II Systems
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ICS9248-77
Group Offset
Group
Offset
CPU to 3V66
0.0-1.5ns CPU leads
3V66 to PCI
1.5-4.0ns 3V66 leads
CPU to IOAPIC
1.5-4.0ns CPU leads
No te: 1 . All o ffsets are to be meas u red at ris in g edg es.
Measurement Loads
CPU @ 20pF, 3V66 @ 30pF
3V66 @ 30pF, PCI @ 30pF
CPU @ 20pF, IOAPIC @ 20pF
Measure Points
CPU @1.25V, 3V66 @ 1.5V
3V66 @ 1.5V, PCI @ 1.5V
CPU @1.25V, IOAPIC @ 1.5V
Electrical Characteristics - CPUCLK
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Output High Voltage VOH2B IOH = -12.0 mA
Output Low Voltage
VOL2B IOL = 12.0 mA
Output High Current
IOH2B VOH = 1.7 V
Output Low Current
IOL2B VOL = 0.7 V
Rise Time
tr2B1
VOL = 0.4 V, VOH = 2.0 V
Fall Time
tf2B1
VOH = 2.0 V, VOL = 0.4 V
Duty Cycle
dt2
1
B
VT = 1.25 V
Skew
tsk2B1 VT = 1.25 V
Jitter, Cycle-to-cycle tjcyc-cyc2B1 VT = 1.25 V
Jitter, One Sigma
Jitter, Absolute
tj1s2B1
tjab
s
1
2B
VT = 1.25 V
VT = 1.25 V
1Guaranteed by design, not 100% tested in production.
2 2.24
0.31
-31
19 25
1.35
1.4
45 47
63
125
65
-250 148
MAX UNITS
V
0.4 V
-19 mA
mA
1.6 ns
1.6 ns
55 %
175 ps
250 ps
150 ps
+250 ps
Electrical Characteristics - CPU/2
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Output High Voltage VOH2B IOH = -12.0 mA
Output Low Voltage
VOL2B IOL = 12.0 mA
Output High Current
IOH2B VOH = 1.7 V
Output Low Current
IOL2B VOL = 0.7 V
Rise Time
tr2B1
VOL = 0.4 V, VOH = 2.0 V
Fall Time
tf2B1
VOH = 2.0 V, VOL = 0.4 V
Duty Cycle
dt2
1
B
VT = 1.25 V
Jitter, Cycle-to-cycle
tjcy
1
c-cyc2B
VT = 1.25 V
Jitter, One Sigma
Jitter, Absolute
tj1s2B1
tjab
s
1
2B
VT = 1.25 V
VT = 1.25 V
1Guaranteed by design, not 100% tested in production.
2 2.24
0.31
-31
19 26
1.2
1.2
45 49
125
50
-250 97
MAX UNITS
V
0.4 V
-19 mA
mA
1.6 ns
1.6 ns
55
%
250 ps
150 ps
+250 ps
10
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