ICS841S02I Datasheet, PDF (2/17 Pages) Integrated Device Technology – PCI EXPRESS™ CLOCK GENERATOR

ICS841S02I
PCI EXPRESS™ CLOCK GENERATOR
PRELIMINARY
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 7, 9
2, 8, 20
3, 4
V_{SS_SRC}
V_{DD_SRC}
SRCT2, SRCC2
Power
Power
Output
Ground for core and SRC outputs.
Power supply for core and SRC outputs.
Differential output pair. HCSL interface levels.
5, 6
SRCT1, SRCC1 Output
Differential output pair. HCSL interface levels.
A fixed precision resistor (475W) from this pin to ground provides a
10
IREF
Input
reference current used for differential current-mode SRCCx, SRCTx
clock outputs.
11
12
13
14
15, 16
V_SSA
V_DDA
V_{SS_REF}
V_{DD_REF}
XTAL_IN, XTAL_OUT
Power
Power
Power
Power
Input
Analog ground pin.
Power supply for PLL.
Ground for crystal interface
Power supply for crystal interface.
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
17
nc
Unused
No connect.
SMBus compatible SCLK. This pin has an internal pullup resistor,
18
SCLK
Input Pullup but is in high impedance in powerdown mode.
LVCMOS/LVTTL interface levels.
19
SDATA
Input/
Output
SMBus compatible SDATA. This pin has an internal pullup resistor,
Pullup but is in high impedance in powerdown mode.
LVCMOS/LVTTL interface levels.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C
IN
R_PULLUP
C_OUT
L_IN
Parameter
Input Capacitance
Input Pullup Resistor
Output Pin Capacitance
Pin Inductance
Test Conditions
Minimum
3
Typical
4
51
Maximum
5
7
Units
pF
kΩ
pF
nH
IDT^™ / ICS^™ PCI EXPRESS CLOCK GENERATOR
2
ICS841S02BGI REV. C NOVEMBER 1, 2007