cy28rs680-2 SpectraLinear Inc, cy28rs680-2 Datasheet - Page 2

• Manufacturer Part Number: cy28rs680-2
• Description: Clock Generator For Ati Rs5xx/6xx Chipsets
• Manufacturer: SpectraLinear Inc

Rev 1.0, November 22, 2006
Pin Description
Pin No.
16, 17,
29, 30,
45, 46,
12, 13
18, 19
31, 32
34, 37
35, 36
48, 49
22, 23
26,27
40,41
6, 7
10
14
15
20
21
24
25
28
33
38
39
42
43
44
47
50
11
1
2
3
4
5
8
9
USB_48 [1:0]
ATIGT/C[2:1]
SRCT/C[3:2]
CPUT/C[1:0]
RESET_IN#
CLKREQ#B
CLKREQ#A
VDD_ATIG
SRCT/C[4]
VDD_SRC
VDD_SRC
VDD_SRC
VSS_ATIG
VDD_SRC
VDD_CPU
VDD_REF
VSS_SRC
VSS_SRC
VSS_SRC
VSS_SRC
VSS_CPU
VSS_REF
ATIGT/C3
ATIGT/C0
SRCT/C1
SRCT/C0
VDD_48
VSS_48
SDATA
XOUT
VDDA
VSSA
SCLK
Name
XIN
I/O,PU SMBus-compatible SDATA.This pin has an internal pull-up, but is tri-stated in power-down.
O, DIF 100 MHz differential serial reference clock. Intel Type-SR buffer.
O, DIF 100 MHz differential serial reference clock. Intel Type-SR buffer.
O, DIF 100 MHz differential serial reference clock. Intel Type-SR buffer.
O, DIF Differential Selectable serial reference clock. Intel Type-SR buffer.
O, DIF Differential Selectable serial reference clock. Intel Type-SR buffer.
O, DIF Differential Selectable serial reference clock. Intel Type-SR buffer.
O, DIF 100 MHz differential serial reference clock. Intel Type-SR buffer.
O, DIF Differential CPU clock output.
O, SE 48 MHz clock output. Intel
I, SE,
I, SE,
PWR GND for REF, XTAL
PWR 3.3V power supply for REF, XTAL
PWR 3.3V power supply for USB outputs
PWR 3.3V power supply for SRC outputs
PWR 3.3V power supply for SRC outputs
PWR 3.3V power supply for SRC outputs
PWR 3.3V power supply for ATIG outputs
PWR 3.3V power supply for SRC outputs
PWR 3.3V Analog Power for PLLs
PWR 3.3V power supply for CPU outputs
GND
I, PU
GND
GND
GND
GND
GND
GND
GND
Type
I,PU
PU
PU
O
I
14.318 MHz Crystal Input
14.318 MHz Crystal Output
Ground for USB outputs
SMBus-compatible SCLOCK.This pin has an internal pull-up, but is tri-stated in power-down.
3.3V LVTTL Input (Negative Edge Triggered)
When this pin is asserted LOW, all PLLs will transition to a safe default frequency. This may
be the POR defaults or a safe value stored in SMBUS registers.
(10% overclocking support through SMBUS)
Ground for SRC outputs
(10% overclocking support through SMBUS)
Ground for SRC outputs
(10% overclocking support through SMBUS)
Ground for SRC outputs
Includes 50% overclock support through SMBUS
Output Enable control for SRCT/C. Output enable control required by Minicard specification.
This pin has an internal pull up. 0 = selected SRC output is enabled. 1 = selected SRC output
is disabled.
Includes 50% overclock support through SMBUS
Ground for ATIG outputs
Includes 50% overclock support through SMBUS
Ground for SRC outputs
(10% overclocking support through SMBUS)
Analog Ground
Intel Type-SR buffer.
Ground for CPU outputs
Output Enable control for SRCT/C. Output enable control required by Minicard specification.
This pin has an internal pull-up.
0 = selected SRC output is enabled. 1 = selected SRC output is disabled.
INFORMATION
ADVANCE
®
Type-3A buffer.
Description
CY28RS680-2
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