PRELIMINARY
ICS841S01I
Integrated
Circuit
Systems, Inc.
PCI EXPRESS™ CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
1, 6
Name
VSS_SRC
Type
Power
Description
Ground for SRC outputs.
2, 5, 16
3, 4
VDD_SRC
Power
Output
Power supply for SRC outputs.
Differential output pair. HCSL interface levels.
SRCT0, SRCC0
A fixed precision resistor (475Ω) from this pin to ground provides a
reference current used for differential current-mode SRCC0, SRCT0
clock outputs.
7
IREF
Input
8
VSSA
VDDA
Power
Power
Power
Power
Analog ground pin.
9
Power supply for PLL.
10
11
VSS_REF
VDD_REF
Ground for crystal interface
Power supply for crystal interface.
12,
13
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
XTAL_IN, XTAL_OUT
Input
SMBus compatible SCLK. This pin has an internal pullup resistor, but
Pullup is in high impedance in powerdown mode.
LVCMOS/LVTTL interface levels.
SMBus compatible SDATA. This pin has an internal pullup resistor,
Pullup but is in high impedance in powerdown mode.
LVCMOS/LVTTL interface levels.
14
15
SCLK
Input
SDATA
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
Parameter
Test Conditions
Minimum Typical
Maximum Units
Input Capacitance
Input Pullup Resistor
Output Pin Capacitance
Pin Inductance
4
pF
RPULLUP
COUT
51
kΩ
3
5
7
pF
nH
LIN
841S01BGI
www.icst.com/products/hiperclocks.html
JUNE 12, 2006
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