ICS932S203 Datasheet, PDF (2/18 Pages) Integrated Circuit Systems – Frequency Generator with 133MHz Differential CPU Clocks

ICS932S203
Frequency Generator with 133MHz Differential CPU Clocks
Pin Description
PIN NUMBER
1, 8, 14, 19, 26,
32, 37, 46, 50
2
PIN NAME
VDD
X1
3
X2
7, 6, 5
4, 9, 15, 20, 27,
31, 36, 41, 47
18, 17, 16, 13,
12,11, 10
23, 22, 21
24
25
PCICLK_F (2:0)
GND
PCICLK (6:0)
66MHz_OUT (2:0)
3V66 (4:2)
66MHz_IN
3V66_5
PD#
28
Vtt_PWRGD#
29
30
33
34
35
38
39
40, 55
42
SDATA
SCLK
3V66_0
PCI_STOP#
3V66_1/VCH_CLK
48MHz_DOT
48MHz_USB
FS (1:0)
I REF
43
44, 48, 51, 53
45, 49, 52, 54
56
MULTSEL0
CPUCLKC (3:0)
CPUCLKT (3:0)
REF
TYPE
DESCRIPTION
PWR
3.3V power supply
X2 Crystal Input
X1 Crystal
Output
OUT
14.318MHz Crystal input
14.318MHz Crystal output
Free running PCI clock not affected by PCI_STOP# for power management.
PWR
Ground pins for 3.3V supply
OUT
OUT
OUT
IN
OUT
IN
IN
I/O
IN
OUT
IN
OUT
OUT
OUT
IN
OUT
IN
OUT
OUT
OUT
PCI clock outputs
66MHz buffered 66MHz_OUT from 66MHz_IN input.
66MHz reference clocks, from internal VCO
66MHz input to buffered 66MHz_OUT and PCI clocks
66MHz reference clock, from internal VCO
Invokes power-down mode. Active Low.
This 3.3V LVTTL input is a level sensitive strobe used to determine
when FS[0:2] and MULTISEL0 inputs are valid and are ready to be
sampled
(active low)
Data pin for SMBus circuitry 5V tolerant
Clock pin of SMBus circuitry 5V tolerant
66MHz reference clocks, from internal VCO
Halts PCICLK clocks at logic 0 level, when input low except
PCICLK_F which are free running
3.3V output selectable through I²C to be 66MHz from internal VCO or
48MHz (non-SSC)
48MHz output clock for DOT
48MHz output clock for USB
Special 3.3V input for Mode selection
This pin establishes the reference current for the CPUCLK pairs. This pin
requires a fixed precision resistor tied to ground in order to establish the
appropriate current.
MULTSEL0 input is sensed on power-up and then internally latched prior to
the pin being used for output on 3V 14.318MHz clocks.
"Complementary" clocks of differential pair CPU outputs. These are current
outputs and external resistors are required for voltage bias.
"True" clocks of differential pair CPU outputs. These are current outputs and
external resistors are required for voltage bias.
14.318MHz reference clock.
Power Groups
(Analog)
VDDA = PLL1
VDD48 = 48MHz, PLL
VDDREF = VDD for Xtal, POR
(Digital)
VDDPCI
VDD3V66
VDDCPU
IDT^TM Frequency Generator with 133MHz Differential CPU Clocks
2
0601G—01/26/10