CY28439 SpectraLinear, CY28439 Datasheet - Page 2

• Manufacturer Part Number: CY28439
• Description: Clock Generator
• Manufacturer: SpectraLinear

Rev 1.0, November 21, 2006
Pin Description
6,56
1,5
3
2,4,53,54,
55
7
8
9
16
10
11
12
13
14,15
17,18,21,
22,23,24,
30,31,32,
33
19,28,34
26,27
20,25,29
35
36
37
41
39,40,42,43 CPUT/C
38
45
44
46
47
48
49
50
51
52
Pin No.
VDD_PCI
VSS_PCI
FS_E/PCI4
PCI
PCIF0
FS_A/PCIF1
FS_B/PCIF2
VTT_PWRGD#/PD
VDD_48
SEL24_48#/24_48
M
USB48
VSS_48
DOT96T, DOT96C
SRCT/C
VDD_SRC
SRCT/C_SATAT/C O, DIF Differential serial reference clock. Recommended output for SATA.
VSS_SRC
VDDA
VSSA
IREF
VDD_CPU
VSS_CPU
SCLK
SDATA
VDD_REF
XOUT
XIN
VSS_REF
REF0/FS_D
REF1/FS_C
SRESET#
Name
I/O, PU,
I/O, PD,
I/O, SE,
I/O,PD,
PU,SE
O, DIF Fixed 96-MHz clock output.
O, DIF Differential serial reference clocks. Outputs have overclocking capability.
O, DIF Differential CPU clock outputs.
O, SE,
O, SE 33-MHz clocks.
O, SE 14.318-MHz crystal output.
O, SE 3.3V output for Watchdog reset.
O,SE 33-MHz free running clock
PWR 3.3V power supply for outputs.
PWR 3.3V power supply for outputs.
PWR 3.3V power supply for outputs.
PWR 3.3V power supply for PLL.
PWR 3.3V power supply for outputs.
PWR 3.3V power supply for outputs.
GND
I, PD
GND
GND
GND
GND
GND
Type
I,O,
I/O,
PD
PD
SE
SE
SE
I/O
I
I
I
Ground for outputs.
3.3V-tolerant input for CPU frequency selection/33-MHz clock.
Refer to DC Electrical Specifications table for Vil_FS and Vih_FS specifications.
3.3V-tolerant input for CPU frequency selection/Free running 33-MHz clock.
Refer to DC Electrical Specifications table for Vil_FS and Vih_FS specifications.
3.3V-tolerant input for CPU frequency selection/Free running 33-MHz clock.
Refer to DC Electrical Specifications table for Vil_FS and Vih_FS specifications.
3.3V LVTTL input. This pin is a level sensitive strobe used to latch the FS_A, FS_B,
FS_C,FS_D, FS_E, SEL24_48. After VTT_PWRGD# (active LOW) assertion, this pin
becomes a real-time input for asserting power down (active HIGH).
Latched select input for 24-/48-MHz output/ 24-/48-MHz output
0 = 48 MHz, 1 = 24 MHz
48-MHz clock output.
Ground for outputs.
Ground for outputs.
Ground for PLL.
A precision resistor is attached to this pin, which is connected to the internal current
reference.
Ground for outputs.
SMBus-compatible SCLOCK.
SMBus-compatible SDATA.
14.318-MHz crystal input.
Ground for outputs.
3.3V-tolerant input for CPU frequency selection/Reference clock. Refer to DC
Electrical Specifications table for Vil_FS and Vih_FS specifications.
3.3V-tolerant input for CPU frequency selection/Reference clock.
Selects test mode if pulled to V
Refer to DC Electrical Specifications table for VILFS_C,VIMFS_C,VIHFS_C specifica-
tions.
This output is open drain type with a high (>100-k ) internal pull-up resistor.
IHFS_C
Description
when VTT_PWRGD# is asserted low.
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CY28439
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