CY28419
Pin Description
Pin No.
1,2
4
Pin Name
REF(0:1)
XIN
Pin Type
O, SE
I
Pin Description
Reference Clock.
3.3V 14.318-Mz clock output.
Crystal Connection or External Reference Frequency Input.
This pin has dual
functions. It can be used as an external 14.318-MHz crystal connection or as an
external reference frequency input.
Crystal Connection.
Connection for an external 14.318-MHz crystal output.
CPU Clock Output.
Differential CPU clock outputs. See
Table 1
for frequency config-
uration.
CPU Clock Output.
Differential CPU clock outputs. See
Table 1
for frequency config-
uration.
Differential serial reference clock.
66 MHz Clock Output.
3.3V 66-MHz clock from internal VCO.
48/66 MHz Clock Output.
3.3V selectable through SMBus to be 66 or 48 MHz.
Free Running PCI Output.
33-MHz clocks divided down from 3V66.
PCI Clock Output.
33-MHz clocks divided down from 3V66.
Fixed 48 MHz clock output.
Fixed 48 MHz clock output.
3.3V LVTTL input for CPU frequency selection.
Current Reference.
A precision resistor is attached to this pin which is connected to
the internal current reference.
3.3V LVTTL input for power-down# active LOW.
3.3V LVTTL input is a level-sensitive strobe used to latch the FS0 input
(active
LOW).
SMBus-compatible SDATA.
SMBus-compatible SCLOCK.
Ground for current reference.
3.3V power supply for PLL.
Ground for PLL.
3.3V power supply for outputs.
Ground for outputs.
3.3V power supply for outputs.
Ground for outputs.
3.3V power supply for outputs.
Ground for outputs.
3.3V power supply for outputs.
Ground for outputs.
3.3V power supply for outputs.
Ground for outputs.
3.3V power supply for outputs.
Ground for outputs.
5
41,44,47,50
40,43,46,49
38, 37
22,23,26,27
29
7,8,9
XOUT
CPUT(0:3)
CPUC(0:3)
SRCT, SRCC
3V66(3:0)
3V66_4VCH
PCIF(0:2)
O, SE
O, DIF
O, DIF
O, DIF
O, SE
O, SE
O, SE
O, SE
O, SE
O, SE
I
I
I, PU
I
I/O
I
GND
PWR
GND
PWR
GND
PWR
GND
PWR
GND
PWR
GND
PWR
GND
PWR
GND
12,13,14,15, PCI(0:6)
18,19,20
31,
32
51,56
52
21
35
30
28
53
55
54
42,48
45
36
39
34
33
10,16
11,17
24
25
3
6
USB_48
DOT_48
FS_A, FS_B
IREF
PD#
VTT_PWRGD#
SDATA
SCLK
VSS_IREF
VDD_A
VSS_A
VDD_CPU
VSS_CPU
VDD_SRC
VSS_SRC
VDD_48
VSS_48
VDD_PCI
VSS_PCI
VDD_3V66
VSS_3V66
VDD_REF
VSS_REF
Rev 1.0, November 22, 2006
Page 2 of 15
SPECTRALINEAR [ SPECTRALINEAR INC ]
