ICS9248-97 Datasheet, PDF (7/14 Pages) Integrated Circuit Systems – Frequency Timing Generator for PENTIUM II Systems

ICS9248-97
Group Offset
Group
CPU to 3V66
3V66 to PCI
CPU to IOAPIC
Offset
0.0-1.5ns CPU leads
1.5-4.0ns 3V66 leads
1.5-4.0ns CPU leads
Measurement Loads
CPU @ 20pF, 3V66 @ 30pF
3V66 @ 30pF, PCI @ 30pF
CPU @ 20pF, IOAPIC @ 20pF
Note: 1. All offsets are to be measured at rising edges.
Measure Points
CPU @1.25V, 3V66 @ 1.5V
3V66 @ 1.5V, PCI @ 1.5V
CPU @1.25V, IOAPIC @ 1.5V
Electrical Characteristics - CPUCLK
T_A = 0 - 70º C; V_DD = 3.3 V +/-5%, V_DDL = 2.5 V +/-5%; C_L = 20 pF (unless otherwise stated)
PARAMETER SYMBOL
CONDITIONS
MIN
Output Impedance
R_DSP2B1 V_O = V_DD*(0.5)
13.5
Output Impedance
R_DSN2B1 V_O = V_DD*(0.5)
13.5
Output High Voltage V_OH2B I_OH = -12.0 mA
2
Output Low Voltage V_OL2B I_OL = 12.0 mA
Output High Current
I_OH2B V_OH = 1.7 V
Output Low Current
I_OL2B V_OL = 0.7 V
19
Rise Time
t_r2B1 V_OL = 0.4 V, V_OH = 2.0 V
Fall Time
t_f2B1 V_OH = 2.0 V, V_OL = 0.4 V
Duty Cycle
d_t2B1
V_T = 1.25 V CPU Frequencies: 100 to 159MHz
V_T = 1.25 V CPU Frequencies: 162 to 180MHz
45
41
Skew
Jitter, Cycle-to-cycle
t_sk2B1 V_T = 1.25 V
t_jcyc-cyc2B1 V_T = 1.25 V
1_{Guaranteed by design, not 100% tested in production.}
TYP MAX UNITS
30
45
Ω
32
45
Ω
2.24
V
0.31 0.4 V
-31 -19 mA
25
mA
1.47 1.8 ns
1.51 1.8 ns
50.5 55
%
47.5 51
27 175 ps
218 300 ps
Electrical Characteristics - CPU/2
T_A = 0 - 70º C; V_DD = 3.3 V +/-5%, V_DDL = 2.5 V +/-5%; C_L = 20 pF (unless otherwise stated)
PARAMETER SYMBOL
CONDITIONS
MIN
Output Impedance
R_DSP2B1 V_O = V_DD*(0.5)
13.5
Output Impedance
R_DSN2B1 V_O = V_DD*(0.5)
13.5
Output High Voltage V_OH2B I_OH = -12.0 mA
2
Output Low Voltage
V_OL2B I_OL = 12.0 mA
Output High Current
I_OH2B V_OH = 1.7 V
Output Low Current
I_OL2B V_OL = 0.7 V
19
Rise Time
t_r2B1 V_OL = 0.4 V, V_OH = 2.0 V
Fall Time
t_f2B1 V_OH = 2.0 V, V_OL = 0.4 V
Duty Cycle
d_t2B1 V_T = 1.25 V
45
Jitter, Cycle-to-cycle t_jcyc-cyc2B1 V_T = 1.25 V
1_{Guaranteed by design, not 100% tested in production.}
TYP MAX UNITS
30
45
Ω
31
45
Ω
2.2
V
0.31 0.4
V
-31 -19 mA
26
mA
1.21 1.6 ns
1.17 1.6 ns
48.6 55
%
227 250 ps
7