![](http://datasheet.mmic.net.cn/100000/IMISC670DYB_datasheet_3494103/IMISC670DYB_9.png)
SC670
I
2C Clock Generator for Pentium Notebook Designs.
Approved Product
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.4
6/20/97
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 9 of 12
SWITCHING CHARACTERISTICS
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Output Duty Cycle
-
45
50
55
%
Measured at 1.5V
CPU to PCI Offset
tOFF
1
-
4
ns
15 pf Load Measured at 1.5V
Buffer out Skew All CPU
and PCI Buffer Outputs
tSKEW
-
250
ps
15 pf Load Measured at 1.5V
Period Adjacent Cycles
P
-
+250
ps
-
Jitter Spectrum
20 dB
Bandwidth from Center
BWJ
500
KHz
Overshoot/Undershoot
Beyond Power Rails
Vover
-
1.5
V
22 ohms @ source of 8 inch PCB run
to 15 pf load
Ring Back Exclusion
VRBE
0.7
2.1
V
note1
VDD = VDDQ3 =3.3V
±5%, VDDQ2 = 2.375V to 2.9V, TA = 0C to +70C
note 1: Ring Back must not enter this range.
TYPE 1 BUFFER CHARACTERISTICS FOR CPUCLK(0:3)
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Pull-Up Current
IOH
-91
-131
-183
mA
Vout = 1.0 V
Pull-Up Current
IOH
-43
-62
-87
mA
Vout = 2.0 V
Pull-Down Current
IOL
83
119
167
mA
Vout = 1.2 V
Pull-Down Current
IOL
26
38
53
mA
Vout = 0.3 V
Rise/Fall Time Min
Between 0.4 V and 2.0 V
TRFmin
0.4
-
nS
10 pF Load
Rise/Fall Time Max
Between 0.4 V and 2.0 V
TRFmax
-
1.5
nS
20 pF Load
VDD = VDDQ3 =3.3V
±5%, VDDQ2 = 2.5V±5% , TA = 0C to +70C
TYPE 2 BUFFER CHARACTERISTICS FOR IOAPIC
Characteristic
Symbol
Min
Typ
Max
Units
Conditions
Pull-Up Current
IOH
-91
-131
-183
mA
Vout = 1.0 V
Pull-Up Current
IOH
-43
-62
-87
mA
Vout = 2.0 V
Pull-Down Current
IOL
83
119
167
mA
Vout = 1.2 V
Pull-Down Current
IOL
26
38
53
mA
Vout = 0.3 V
Rise/Fall Time Min Between 0.4 V and 2.0 V
TRFmin
0.4
-
nS
10 pF Load
Rise/Fall Time Max Between 0.4 V and 2.0 V
TRFmax
-
1.9
nS
20 pF Load
VDD = VDDQ3 =3.3V
±5%, VDDQ2 = 2.5V±5% , TA = 0C to +70C