CY28443-2 - Silicon Labs

CY28443-2
Clock Generator for Intel®Calistoga Chipset
Features
• 33 MHz PCI clock
• Low-voltage frequency select input
• Supports Intel Pentium M CPU
• I2C support with readback capabilities
• Selectable CPU frequencies
• Differential CPU clock pairs
• Ideal Lexmark Spread Spectrum profile for maximum
electromagnetic interference (EMI) reduction
• 100 MHz differential SRC clocks
• 3.3V power supply
• 48 MHz USB clock
• 56-pin package
• 96 MHz differential dot clock
• Selectable 100-MHz LVDS clock
• SRC clocks independently stoppable through
CLKREQ#[A:B]
CPU
SRC
PCI
REF
DOT96
48M
SRC/LVDS100M
x2 / x3
x5/6/7
x6
x2
x1
x1
x1
Block Diagram
XIN
XOUT
Pin Configuration
14.318MHz
Crystal
SEL_CLKREQ
PCI_STP#
CPU
PLL
CPU_STP#
CLKREQ[A:B]#
PLL Reference
Divider
VDD
REF[0:1]
IREF
VDD
CPUT[0:1]
CPUC[0:1]
VDD
CPUT2_ITP/SRCT11
CPUC2_ITP/SRCC11
ITP_SEL
VDD
SRCT([2:5],[8:9])
SRCC([2:5],[8:9])
FS[C:A]
VDD
PCI[3:5]
VDD_PCI
LVDS
PLL
Divider
PCIF[0:1]
VDD
SRCT0/100MT_SST
SRCC0/100MC_SST
VDD48
27MSpread
FCTSEL1
Fixed
PLL
Divider
VDD48
DOT96T
DOT96C
VDD48
48M
27M
PLL
VTT_PWRGD#/PD
SDATA
SCLK
I2C
Logic
Divider
VDD48
27MNon-spread
VDD
VSS
PCI3
PCI4
PCI5/FCTSEL1
VSS
VDD
ITP_SEL/PCIF0
PCIF1
VTT_PWRGD#/PD
VDD
FSA /48M
VSS
DOT96T/27M non Spread
DOT96C/27M Spread
FSB
SRCT0/100MT_SST
SRCC0/100MC_SST
SRCT2
SRCC2
VDD
SRCT3
SRCC3
SRCT4
SRCC4
SRCT5 _SATA
SRCC5_SATA
VDD
........................ Document #: 38-07718 Rev. *B Page 1 of 23
400 West Cesar Chavez, Austin, TX 78701
1+(512) 416-8500
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43
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41
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37
36
35
34
33
32
31
30
29
PCI2/SEL_CLKREQ
PCI_STP#
CPU_STP#
REF0/FSC
REF1/FCTSEL0
VSS
XIN
XOUT
VDD
SDATA
SCLK
VSS
CPUT0
CPUC0
VDD
CPUT1
CPUC1
IREF
VSSA
VDDA
SRCT11/CPUT2_itp
SRCC11/CPUC2_itp
VDD
SRCT9/CLKREQA
SRCC9/CLKREQB
SRCT8
SRCC8
VSS
www.silabs.com
CY28443-2
Pin Descriptions
Pin No.
Name
Type
Description
1, 7, 11, 21, VDD
28, 34, 42, 48
PWR
3.3V power supply
2, 6, 13, 29,
45, 51
VSS
GND
Ground
33,32
SRCT9/CLKREQA#,
SRCC9/CLKREQB#
3,4
PCI[3:4]
O, SE 33-MHz clock
5
PCI5/FCTSEL1
O, SE 33-MHz clock/3.3 LVTTL input for selecting SRC[T/C]0 or LVDS100M[T/C]
(sampled on the VTT_PWRGD# assertion).
8
ITP_EN/PCIF0
I/O, SE 3.3V LVTTL input to enable SRC[T/C]7 or CPU[T/C]2_ITP/33-MHz clock
output. (sampled on the VTT_PWRGD# assertion).
9
PCIF1
I/O, SE 33-MHz clock
10
VTT_PWRGD#/PD
12
FSA/48M
14, 15
DOT96T/27M non
Spread
DOT96C/27M Spread
16
FSB
17,18
SRC[T/C]0/
LCD100M[T/C]
I/O, PU 3.3V LVTTL input for enabling assigned SRC clock (active LOW) or 100-MHz
serial reference clock.
Default function is SRC9
I, PU
3.3V LVTTL input. This pin is a level sensitive strobe used to latch the FS_[C:A],
ITP_EN, FCTSEL[1:0], SEL_CLKREQ. After VTT_PWRGD# (active LOW)
assertion, this pin becomes a real-time input for asserting power-down (active
HIGH).
I/O
3.3V-tolerant input for CPU frequency selection/Fixed 48-MHz clock output.
O, DIF Fixed 96-MHz Differential clock/Single-ended 27-MHz clocks. When
configured for 27 MHz, only the clock on pin 15 contains spread.
I
3.3V-tolerant input for CPU frequency selection.
O,DIF 100-MHz Differential Serial Reference clock/100-MHz LVDS Differential
clock
19,20,22,23, SRCT/C
24,25,30,31
O, DIF 100-MHz Differential Serial Reference clocks.
26,27
SRC[T/C]5_SATA
O, DIF Differential serial reference clock. Recommended output for SATA.
36,35
CPUT2_ITP/SRCT11, O, DIF Selectable differential CPU or SRC clock output.
CPUC2_ITP/SRCC11
37
VDDA
PWR
3.3V power supply for PLL.
38
VSSA
GND
Ground for PLL.
39
IREF
I
44,43,41,40
CPU[T/C][0:1]
O, DIF Differential CPU clock outputs.
46
SCLK
I
47
SDATA
I/O
49
XOUT
50
XIN
A precision resistor is attached to this pin, which is connected to the internal
current reference.
SMBus-compatible SCLOCK.
SMBus-compatible SDATA.
O, SE 14.318-MHz crystal output.
I
14.318-MHz crystal input.
52
REF1
O
Fixed 14.318-MHz clock output
53
REF0/FSC
I/O
3.3V-tolerant input for CPU frequency selection/fixed 14.318 clock output.
54
CPU_STP#
I, PU
3.3V LVTTL input for CPU_STP# active LOW.
55
PCI_STP#
I, PU
3.3V LVTTL input for PCI_STP# active LOW.
56
PCI2/SEL_CLKREQ
I/O, PD Fixed 33-MHz clock output/3.3V-tolerant input for CLKREQ pin selection
(sampled on the VTT_PWRGD# assertion).
0 = CLKREQ[A:B]# functionality
1 = SRC[T/C]9 functionality
........................ Document #: 38-07718 Rev. *B Page 2 of 23
CY28443-2
Table 1. Frequency Select Table FSA, FSB and FSC
FSC
FSB
FSA
CPU
SRC
PCIF/PCI
27MHz
REF0
DOT96
USB
1
0
1
100 MHz
100 MHz
33 MHz
27 MHz
14.318 MHz
96 MHz
48 MHz
0
0
1
133 MHz
100 MHz
33 MHz
27 MHz
14.318 MHz
96 MHz
48 MHz
0
1
1
166 MHz
100 MHz
33 MHz
27 MHz
14.318 MHz
96 MHz
48 MHz
0
1
0
200 MHz
100 MHz
33 MHz
27 MHz
14.318 MHz
96 MHz
48 MHz
Frequency Select Pins (FSA, FSB, and FSC)
Host clock frequency selection is achieved by applying the
appropriate logic levels to FSA, FSB, FSC inputs prior to
VTT_PWRGD# assertion (as seen by the clock synthesizer).
Upon VTT_PWRGD# being sampled low by the clock chip
(indicating processor VTT voltage is stable), the clock chip
samples the FSA, FSB, and FSC input values. For all logic
levels of FSA, FSB, and FSC, VTT_PWRGD# employs a
one-shot functionality in that once a valid low on
VTT_PWRGD# has been sampled, all further VTT_PWRGD#,
FSA, FSB, and FSC transitions will be ignored, except in test
mode.
Serial Data Interface
To enhance the flexibility and function of the clock synthesizer,
a two-signal serial interface is provided. Through the Serial
Data Interface, various device functions, such as individual
clock output buffers, can be individually enabled or disabled.
The registers associated with the Serial Data Interface
initializes to their default setting upon power-up, and therefore
use of this interface is optional. Clock device register changes
are normally made upon system initialization, if any are
required. The interface cannot be used during system
operation for power management functions.
Data Protocol
The clock driver serial protocol accepts byte write, byte read,
block write, and block read operations from the controller. For
block write/read operation, the bytes must be accessed in
sequential order from lowest to highest byte (most significant
bit first) with the ability to stop after any complete byte has
been transferred. For byte write and byte read operations, the
system controller can access individually indexed bytes. The
offset of the indexed byte is encoded in the command code,
as described in Table 2.
The block write and block read protocol is outlined in Table 3
while Table 4 outlines the corresponding byte write and byte
read protocol. The slave receiver address is 11010010 (D2h).
Table 2. Command Code Definition
Bit
7
(6:0)
Description
0 = Block read or block write operation, 1 = Byte read or byte write operation
Byte offset for byte read or byte write operation. For block read or block write operations, these bits should be
'0000000'
Table 3. Block Read and Block Write Protocol
Block Write Protocol
Bit
1
8:2
9
Description
Start
Slave address – 7 bits
Write
Block Read Protocol
Bit
1
8:2
9
Description
Start
Slave address – 7 bits
Write
10
Acknowledge from slave
10
Acknowledge from slave
18:11
Command Code – 8 bits
18:11
Command Code – 8 bits
19
Acknowledge from slave
19
Acknowledge from slave
Byte Count – 8 bits
(Skip this step if I2C_EN bit set)
20
Repeat start
27:20
28
36:29
37
45:38
46
Acknowledge from slave
27:21
Slave address – 7 bits
Data byte 1 – 8 bits
28
Read = 1
Acknowledge from slave
29
Acknowledge from slave
Data byte 2 – 8 bits
Acknowledge from slave
....
Data Byte /Slave Acknowledges
....
Data Byte N –8 bits
....
Acknowledge from slave
........................ Document #: 38-07718 Rev. *B Page 3 of 23
37:30
38
46:39
47
55:48
Byte Count from slave – 8 bits
Acknowledge
Data byte 1 from slave – 8 bits
Acknowledge
Data byte 2 from slave – 8 bits
CY28443-2
Table 3. Block Read and Block Write Protocol (continued)
Block Write Protocol
Bit
....
Description
Stop
Block Read Protocol
Bit
Description
56
Acknowledge
....
Data bytes from slave / Acknowledge
....
Data Byte N from slave – 8 bits
....
NOT Acknowledge
....
Stop
Table 4. Byte Read and Byte Write Protocol
Byte Write Protocol
Bit
1
8:2
Description
Start
Slave address – 7 bits
Byte Read Protocol
Bit
1
8:2
Description
Start
Slave address – 7 bits
9
Write
9
Write
10
Acknowledge from slave
10
Acknowledge from slave
18:11
Command Code – 8 bits
18:11
Command Code – 8 bits
19
Acknowledge from slave
19
Acknowledge from slave
27:20
Data byte – 8 bits
28
Acknowledge from slave
29
Stop
........................ Document #: 38-07718 Rev. *B Page 4 of 23
20
27:21
Repeated start
Slave address – 7 bits
28
Read
29
Acknowledge from slave
37:30
Data from slave – 8 bits
38
NOT Acknowledge
39
Stop
CY28443-2
Control Registers
Byte 0: Control Register 0
Bit
7
6
5
@Pup
1
1
1
Name
RESERVED
RESERVED
SRC[T/C]5
4
1
SRC[T/C]4
3
1
SRC[T/C]3
2
1
SRC[T/C]2
1
0
1
1
RESERVED
SRC[T/C]0
/100M[T/C]_SST
Description
RESERVED
RESERVED
SRC[T/C]5 Output Enable
0 = Disable (Tri-state), 1 = Enable
SRC[T/C]4 Output Enable
0 = Disable (Tri-state), 1 = Enable
SRC[T/C]3 Output Enable
0 = Disable (Tri-state), 1 = Enable
SRC[T/C]2 Output Enable
0 = Disable (Tri-state), 1 = Enable
RESERVED, Set = 1
SRC[T/C]0 /100M[T/C]_SST Output Enable
0 = Disable (Hi-Z), 1 = Enable
Byte 1: Control Register 1
Bit
@Pup
Name
7
1
PCIF0
6
1
5
1
USB_48MHz
4
1
REF0
REF0 Output Enable
0 = Disabled, 1 = Enabled
3
1
REF1
REF1 Output Enable
0 = Disabled, 1 = Enabled
2
1
CPU[T/C]1
CPU[T/C]1 Output Enable
0 = Disable (Tri-state), 1 = Enabled
1
1
CPU[T/C]0
CPU[T/C]0 Output Enable
0 = Disable (Tri-state), 1 = Enabled
0
0
CPU, SRC, PCI, PCIF
spread enable
27M_nss_DOT_96[T/C]
Description
PCIF0 Output Enable
0 = Disabled, 1 = Enabled
27M nonspread and DOT_96 MHz Output Enable
0 = Disable (Tri-state), 1 = Enabled
USB_48M MHz Output Enable
0 = Disabled, 1 = Enabled
PLL1 (CPU PLL) Spread Spectrum Enable
0 = Spread off, 1 = Spread on
Byte 2: Control Register 2
Bit
@Pup
Name
7
1
PCI5
PCI5 Output Enable
0 = Disabled, 1 = Enabled
Description
6
1
PCI4
PCI4 Output Enable
0 = Disabled, 1 = Enabled
5
1
PCI3
PCI3 Output Enable
0 = Disabled, 1 = Enabled
4
1
PCI2
PCI2 Output Enable
0 = Disabled, 1 = Enabled
3
1
RESERVED
2
1
RESERVED
1
1
CPU[T/C]2
0
1
PCIF1
RESERVED
RESERVED
CPU[T/C]2 Output Enable
0 = Disabled (Hi-Z), 1 = Enabled
PCIF1 Output Enable
0 = Disabled, 1 = Enabled
........................ Document #: 38-07718 Rev. *B Page 5 of 23
CY28443-2
Byte 3: Control Register 3
Bit
@Pup
Name
Description
7
0
RESERVED
RESERVED, Set = 0
6
0
RESERVED
RESERVED, Set = 0
5
0
SRC5
Allow control of SRC[T/C]5 with assertion of PCI_STP# or SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
4
0
SRC4
Allow control of SRC[T/C]4 with assertion of PCI_STP# or SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
3
0
SRC3
Allow control of SRC[T/C]3 with assertion of PCI_STP# or SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
2
0
SRC2
Allow control of SRC[T/C]2 with assertion of PCI_STP# or SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
1
0
RESERVED
0
0
SRC0
Allow control of SRC[T/C]0 with assertion of PCI_STP# or SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
Description
RESERVED, Set = 0
Byte 4: Control Register 4
Bit
@Pup
Name
7
0
100M[T/C]_SST
6
0
DOT96[T/C]
5
1
SRC[T/C]
4
0
PCIF1
Allow control of PCIF1 with assertion of SW and HW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
3
0
PCIF0
Allow control of PCIF0 with assertion of SW and HW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
2
1
CPU[T/C]2
Allow control of CPU[T/C]2 with assertion of CPU_STP#
0 = Free running, 1 = Stopped with CPU_STP#
1
1
CPU[T/C]1
Allow control of CPU[T/C]1 with assertion of CPU_STP#
0 = Free running, 1 = Stopped with CPU_STP#
0
1
CPU[T/C]0
Allow control of CPU[T/C]0 with assertion of CPU_STP#
0 = Free running, 1 = Stopped with CPU_STP#
100M[T/C]_SST PWRDWN Drive Mode
0 = Driven in PWRDWN, 1 = Tri-state
DOT PWRDWN Drive Mode
0 = Driven in PWRDWN, 1 = Tri-state
SRC[T/C] Stop Drive Mode when CLKREQ# asserted
0 = Driven, 1 = Tri-state
Byte 5: Control Register 5
Bit
@Pup
Name
Description
7
0
SRC[T/C]
SRC[T/C] Stop Drive Mode
0 = Driven when PCI_STP# asserted, 1 = Tri-state when PCI_STP#
asserted
6
0
CPU[T/C]2
CPU[T/C]2 Stop Drive Mode
0 = Driven when CPU_STP# asserted, 1 = Tri-state when CPU_STP#
asserted
5
0
CPU[T/C]1
CPU[T/C]1 Stop Drive Mode
0 = Driven when CPU_STP# asserted, 1 = Tri-state when CPU_STP#
asserted
4
0
CPU[T/C]0
CPU[T/C]0 Stop Drive Mode
0 = Driven when CPU_STP# asserted, 1 = Tri-state when CPU_STP#
asserted
3
0
SRC[T/C]
SRC[T/C] PWRDWN Drive Mode
0 = Driven when PD asserted, 1 = Tri-state when PD asserted
2
0
CPU[T/C]2
CPU[T/C]2 PWRDWN Drive Mode
0 = Driven when PD asserted, 1 = Tri-state when PD asserted
........................ Document #: 38-07718 Rev. *B Page 6 of 23
CY28443-2
Byte 5: Control Register 5 (continued)
Bit
@Pup
Name
Description
1
0
CPU[T/C]1
CPU[T/C]1 PWRDWN Drive Mode
0 = Driven when PD asserted, 1 = Tri-state when PD asserted
0
0
CPU[T/C]0
CPU[T/C]0 PWRDWN Drive Mode
0 = Driven when PD asserted, 1 = Tri-state when PD asserted
Byte 6: Control Register 6
Bit
@Pup
Name
7
0
TEST_SEL
Description
6
0
TEST_MODE
5
1
REF1
REF0 Output Drive Strength
0 = Low, 1 = High
4
1
REF0
REF0 Output Drive Strength
0 = Low, 1 = High
3
1
2
HW
FSC
FSC Reflects the value of the FSC pin sampled on power-up
0 = FSC was low during VTT_PWRGD# assertion
1
HW
FSB
FSB Reflects the value of the FSB pin sampled on power-up
0 = FSB was low during VTT_PWRGD# assertion
0
HW
FSA
FSA Reflects the value of the FSA pin sampled on power-up
0 = FSA was low during VTT_PWRGD# assertion
REF/N or Tri-state Select
0 = Tri-state, 1 = REF/N Clock
Test Clock Mode Entry Control
0 = Normal operation, 1 = REF/N or Tri-state mode,
PCI, PCIF and SRC clock SW PCI_STP Function
outputs except those set 0 = SW PCI_STP assert, 1 = SW PCI_STP deassert
to free running
When this bit is set to 0, all STOPPABLE PCI, PCIF, and SRC outputs will
be stopped in a synchronous manner with no short pulses.
When this bit is set to 1, all STOPPED PCI, PCIF, and SRC outputs will
resume in a synchronous manner with no short pulses.
Byte 7: Vendor ID
Bit
@Pup
Name
Description
7
0
Revision Code Bit 3
Revision Code Bit 3
6
0
Revision Code Bit 2
Revision Code Bit 2
5
0
Revision Code Bit 1
Revision Code Bit 1
4
1
Revision Code Bit 0
Revision Code Bit 0
3
1
Vendor ID Bit 3
Vendor ID Bit 3
2
0
Vendor ID Bit 2
Vendor ID Bit 2
1
0
Vendor ID Bit 1
Vendor ID Bit 1
0
0
Vendor ID Bit 0
Vendor ID Bit 0
Byte 8: Control Register 8
Bit
@Pup
Name
Description
7
0
CPU_SS
0:–0.5% (Peak to peak)
1: –1.0% (Peak to peak)
6
0
CPU-DWN_SS
0: Down Spread
1: Center Spread
5
0
RESERVED
RESERVED, Set = 0
4
0
RESERVED
RESERVED, Set = 0
3
0
RESERVED
RESERVED, Set = 0
2
1
48M
48-MHz Output Drive Strength
0 = Low, 1 = High
........................ Document #: 38-07718 Rev. *B Page 7 of 23
CY28443-2
Byte 8: Control Register 8 (continued)
Bit
@Pup
Name
Description
1
1
RESERVED
RESERVED, Set = 1
0
1
PCIF0
33-MHz Output Drive Strength
0 = Low, 1 = High
Byte 9: Control Register 9
Bit
@Pup
Name
Description
7
0
S3
6
0
S2
27_96_100_SSC Spread Spectrum Selection table:
S[3:0] SS%
5
0
S1
‘0000’ = –0.5%(Default value)
4
0
S0
‘0001’ = –1.0%
‘0010’ = –1.5%
‘0011’ = –2.0%
‘0100’ = ±0.25%
‘0101’ = ±0.5%
‘0110’ = ±0.75%
‘0111’ = ±1.0%
‘1000’ = –0.35%
‘1001’ = –0.68%
‘1010’ = –1.09%
‘1011’ = –1.425%
‘1100’ = ±0.17%
‘1101’ = ±0.34%
‘1110’ = ±0.545%
‘1111’ = ±0.712%
3
1
RESERVED
RESERVED, Set = 1
2
1
27M Spread
27-MHz Spread Output Enable
0 = Disable (Hi-Z), 1 = Enable
1
1
27M_SS/LCD100M
Spread Enable
0
1
PCIF1
27M_SS/LCD100M Spread spectrum enable.
0 = Disable, 1 = Enable.
33-MHz Output Drive Strength
0 = Low, 1 = High
Byte 10: Control Register 10
Bit
@Pup
Name
Description
7
1
SRC[T/C]11
SRC[T/C]11 Output Enable
0 = Disable (Hi-Z), 1 = Enable
6
1
SRC[T/C]9
SRC[T/C]9 Output Enable
0 = Disable (Hi-Z), 1 = Enable
5
1
RESERVED
RESERVED, Set = 1
4
1
SRC[T/C]8
SRC[T/C]8 Output Enable
0 = Disable (Hi-Z), 1 = Enable
3
0
SRC[T/C]9
Allow control of SRC[T/C]9 with assertion of SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
2
0
SRC[T/C]11
Allow control of SRC[T/C]11 with assertion of SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
1
0
RESERVED
RESERVED, Set = 0
0
0
SRC[T/C]8
Allow control of SRC[T/C]8 with assertion of SW PCI_STP#
0 = Free running, 1 = Stopped with PCI_STP#
........................ Document #: 38-07718 Rev. *B Page 8 of 23
CY28443-2
Byte 11: Control Register 11
Bit
@Pup
Name
Description
7
0
RESERVED
RESERVED Set = 0
6
HW
RESERVED
RESERVED
5
HW
RESERVED
RESERVED
4
HW
RESERVED
RESERVED
3
0
27MHz
27 MHz (spread and non-spread) Output Drive Strength
0 = Low, 1 = High
2
0
RESERVED
RESERVED Set = 0
1
0
RESERVED
RESERVED Set = 0
0
HW
RESERVED
RESERVED
Byte 12: Control Register 12
Bit
@Pup
Name
Description
7
0
CLKREQ#A
CLKREQ#A Enable
0 = Disable 1 = Enable
6
1
CLKREQ#B
CLKREQ#B Enable
0 = Disable 1 = Enable
5
1
RESERVED
RESERVED
4
1
RESERVED
RESERVED
3
1
RESERVED
RESERVED
2
1
RESERVED
RESERVED
1
1
RESERVED
RESERVED
0
1
RESERVED
RESERVED
Byte 13: Control Register 13
Bit
@Pup
Name
Description
7
1
RESERVED
RESERVED
6
1
96/100M Clock Speed
96/100 SRC Clock Speed
0 = 96 MHz 1 = 100 MHz
5
1
RESERVED
RESERVED, Set = 1
4
1
RESERVED
RESERVED, Set = 1
3
1
PCI5
PCI5 (Spread and Non-spread) Output Drive Strength
0 = Low, 1 = High
2
1
PCI4
PCI4 (Spread and Non-spread) Output Drive Strength
0 = Low, 1 = High
1
1
PCI3
PCI3 (Spread and Non-spread) Output Drive Strength
0 = Low, 1 = High
0
1
PCI2
PCI2 (Spread and Non-spread) Output Drive Strength
0 = Low, 1 = High
Byte 14: Control Register 14
Bit
@Pup
Name
Description
7
1
RESERVED
RESEREVD
6
0
RESERVED
RESERVED
5
0
RESERVED
RESERVED
4
0
CLKREQ#A
SRC[T/C]5 Control
0 = SRC[T/C]5 not stoppable by CLKREQ#A
1 = SRC[T/C]5 stoppable by CLKREQ#A
........................ Document #: 38-07718 Rev. *B Page 9 of 23
CY28443-2
Byte 14: Control Register 14 (continued)
Bit
@Pup
Name
Description
3
0
CLKREQ#A
SRC[T/C]4 Control
0 = SRC[T/C]4 not stoppable by CLKREQ#A
1 = SRC[T/C]4 stoppable by CLKREQ#A
2
0
CLKREQ#A
SRC[T/C]3 Control
0 = SRC[T/C]3 not stoppable by CLKREQ#A
1 = SRC[T/C]3 stoppable by CLKREQ#A
1
0
CLKREQ#A
SRC[T/C]2 Control
0 = SRC[T/C]2 not stoppable by CLKREQ#A
1 = SRC[T/C]2 stoppable by CLKREQ#A
0
0
CLKREQ#A
SRC[T/C]1 Control
0 = SRC[T/C]1 not stoppable by CLKREQ#A
1 = SRC[T/C]1 stoppable by CLKREQ#A
Byte 15: Control Register 15
Bit
@Pup
Name
Description
7
1
CLKREQ#B
SRC[T/C]8 Control
0 = SRC[T/C]8 not stoppable by CLKREQ#B
1 = SRC[T/C]8 stoppable by CLKREQ#B
6
0
RESERVED
RESERVED
5
0
RESERVED
RESERVED
4
0
CLKREQ#B
SRC[T/C]5 Control
0 = SRC[T/C]5 not stoppable by CLKREQ#B
1= SRC[T/C]5 stoppable by CLKREQ#B
3
0
CLKREQ#B
SRC[T/C]4 Control
0 = SRC[T/C]4 not stoppable by CLKREQ#B
1= SRC[T/C]4 stoppable by CLKREQ#B
2
0
CLKREQ#B
SRC[T/C]3 Control
0 = SRC[T/C]3 not stoppable by CLKREQ#B
1= SRC[T/C]3 stoppable by CLKREQ#B
1
0
CLKREQ#B
SRC[T/C]2 Control
0 = SRC[T/C]2 not stoppable by CLKREQ#B
1= SRC[T/C]2 stoppable by CLKREQ#B
0
0
CLKREQ#B
SRC[T/C]1 Control
0 = SRC[T/C]1 not stoppable by CLKREQ#B
1= SRC[T/C]1 stoppable by CLKREQ#B
Table 5. Crystal Recommendations
Frequency
(Fund)
Cut
Loading Load Cap
Drive
(max.)
Shunt Cap
(max.)
Motional
(max.)
Tolerance
(max.)
Stability
(max.)
Aging
(max.)
14.31818 MHz
AT
Parallel
0.1 mW
5 pF
0.016 pF
35 ppm
30 ppm
5 ppm
20 pF
The CY28443-2 requires a Parallel Resonance Crystal.
Substituting a series resonance crystal will cause the
CY28443-2 to operate at the wrong frequency and violate the
ppm specification. For most applications there is a 300-ppm
frequency shift between series and parallel crystals due to
incorrect loading.
Crystal Loading
Crystal loading plays a critical role in achieving low ppm performance. To realize low ppm performance, the total capacitance
......................Document #: 38-07718 Rev. *B Page 10 of 23
the crystal will see must be considered to calculate the appropriate capacitive loading (CL).
Figure 1 shows a typical crystal configuration using the two
trim capacitors. An important clarification for the following
discussion is that the trim capacitors are in series with the
crystal not parallel. It’s a common misconception that load
capacitors are in parallel with the crystal and should be
approximately equal to the load capacitance of the crystal.
This is not true.
CY28443-2
Use the following formulas to calculate the trim capacitor
values for Ce1 and Ce2.
Load Capacitance (each side)
Ce = 2 * CL – (Cs + Ci)
Total Capacitance (as seen by the crystal)
CLe
Figure 1. Crystal Capacitive Clarification
1
1
( Ce1 + Cs1
+ Ci1 +
1
Ce2 + Cs2 + Ci2
)
CL....................................................Crystal load capacitance
Calculating Load Capacitors
In addition to the standard external trim capacitors, trace
capacitance and pin capacitance must also be considered to
correctly calculate crystal loading. As mentioned previously,
the capacitance on each side of the crystal is in series with the
crystal. This means the total capacitance on each side of the
crystal must be twice the specified crystal load capacitance
(CL). While the capacitance on each side of the crystal is in
series with the crystal, trim capacitors (Ce1,Ce2) should be
calculated to provide equal capacitive loading on both sides.
C lock C hip
Ci2
C i1
=
Pin
3 to 6p
CLe......................................... Actual loading seen by crystal
using standard value trim capacitors
Ce..................................................... External trim capacitors
Cs .............................................. Stray capacitance (terraced)
Ci ...........................................................Internal capacitance
(lead frame, bond wires etc.)
CLK_REQ[0:1]# Description
The CLKREQ#[A:B] signals are active LOW inputs used for
clean enabling and disabling selected SRC outputs. The
outputs controlled by CLKREQ#[A:B] are determined by the
settings in register byte 8. The CLKREQ# signal is a
de-bounced signal in that its state must remain unchanged
during two consecutive rising edges of SRCC to be recognized
as a valid assertion or deassertion. (The assertion and
deassertion of this signal is absolutely asynchronous.)
CLK_REQ[A:B]# Assertion (CLKREQ# -> LOW)
Cs1
X2
X1
Cs2
Trace
2.8 pF
XTAL
Ce1
C e2
Trim
33 pF
Figure 2. Crystal Loading Example
All differential outputs that were stopped are to resume normal
operation in a glitch-free manner. The maximum latency from
the assertion to active outputs is between 2–6 SRC clock
periods (2 clocks are shown) with all SRC outputs resuming
simultaneously. All stopped SRC outputs must be driven high
within 10 ns of CLKREQ#[1:0] deassertion to a voltage greater
than 200 mV.
CLK_REQ[A:B]# Deassertion (CLKREQ# -> HIGH)
The impact of deasserting the CLKREQ#[A:B] pins is all SRC
outputs that are set in the control registers to stoppable via
deassertion of CLKREQ#[A:B] are to be stopped after their
next transition. The final state of all stopped DIF signals is
LOW, both SRCT clock and SRCC clock outputs will not be
driven.
CLKREQ#X
SRCT(free running)
SRCC(free running)
SRCT(stoppable)
SRCT(stoppable)
Figure 3. CLK_REQ#[A:B] Deassertion/Assertion Waveform
...................... Document #: 38-07718 Rev. *B Page 11 of 23
CY28443-2
PD (Power-down) Clarification
The VTT_PWRGD# /PD pin is a dual-function pin. During
initial power-up, the pin functions as VTT_PWRGD#. Once
VTT_PWRGD# has been sampled LOW by the clock chip, the
pin assumes PD functionality. The PD pin is an asynchronous
active HIGH input used to shut off all clocks cleanly prior to
shutting off power to the device. This signal is synchronized
internal to the device prior to powering down the clock synthesizer. PD is also an asynchronous input for powering up the
system. When PD is asserted HIGH, all clocks need to be
driven to a LOW value and held prior to turning off the VCOs
and the crystal oscillator.
PD (Power-down) Assertion
When PD is sampled HIGH by two consecutive rising edges
of CPUC, all single-ended outputs will be held LOW on their
next HIGH-to-LOW transition and differential clocks must held
high or tri-stated (depending on the state of the control register
drive mode bit) on the next diff clock# HIGH-to-LOW transition
within 4 clock periods. When the SMBus PD drive mode bit
corresponding to the differential (CPU, SRC, and DOT) clock
output of interest is programmed to ‘0’, the clock output are
held with “Diff clock” pin driven high at 2 x Iref, and “Diff clock#”
tristate. If the control register PD drive mode bit corresponding
to the output of interest is programmed to “1”, then both the
“Diff clock” and the “Diff clock#” are tri-state. Note Figure 4
shows CPUT = 133 MHz and PD drive mode = ‘1’ for all differential outputs. This diagram and description is applicable to
valid CPU frequencies 100, 133, 166, and 200 MHz. In the
event that PD mode is desired as the initial power-on state, PD
must be asserted high in less than 10 s after asserting
Vtt_PwrGd#. It should be noted that 96_100_SSC will follow
the DOT waveform is selected for 96 MHz and the SRC
waveform when in 100-MHz mode.
PD Deassertion
The power-up latency is less than 1.8 ms. This is the time from
the deassertion of the PD pin or the ramping of the power
supply until the time that stable clocks are output from the
clock chip. All differential outputs stopped in a three-state
condition resulting from power down will be driven high in less
than 300 s of PD deassertion to a voltage greater than
200 mV. After the clock chip’s internal PLL is powered up and
locked, all outputs will be enabled within a few clock cycles of
each other. Figure 5 is an example showing the relationship of
clocks coming up. It should be noted that 96_100_SSC will
follow the DOT waveform is selected for 96 MHz and the SRC
waveform when in 100-MHz mode.
PD
CPUT, 133MHz
CPUC, 133MHz
SRCT 100MHz
SRCC 100MHz
USB, 48MHz
DOT96T
DOT96C
PCI, 33 MHz
REF
Figure 4. Power-down Assertion Timing Waveform
Tstable
<1.8 ms
PD
CPUT, 133MHz
CPUC, 133MHz
SRCT 100MHz
SRCC 100MHz
USB, 48MHz
DOT96T
DOT96C
PCI, 33MHz
REF
Tdrive_PWRDN#
<300 s, >200 mV
Figure 5. Power-down Deassertion Timing Waveform
......................Document #: 38-07718 Rev. *B Page 12 of 23
CY28443-2
CPU_STP# Assertion
CPU_STP# Deassertion
The CPU_STP# signal is an active LOW input used for
synchronous stopping and starting the CPU output clocks
while the rest of the clock generator continues to function.
When the CPU_STP# pin is asserted, all CPU outputs that are
set with the SMBus configuration to be stoppable via assertion
of CPU_STP# will be stopped within two–six CPU clock
periods after being sampled by two rising edges of the internal
CPUC clock. The final states of the stopped CPU signals are
CPUT = HIGH and CPUC = LOW. There is no change to the
output drive current values during the stopped state. The
CPUT is driven HIGH with a current value equal to 6 x (Iref),
and the CPUC signal will be tri-stated.
The deassertion of the CPU_STP# signal will cause all CPU
outputs that were stopped to resume normal operation in a
synchronous manner. Synchronous manner meaning that no
short or stretched clock pulses will be produce when the clock
resumes. The maximum latency from the deassertion to active
outputs is no more than two CPU clock cycles.
CPU_STP#
CPUT
CPUC
Figure 6. CPU_STP# Assertion Waveform
CPU_STP#
CPUT
CPUC
CPUT Internal
CPUC Internal
Tdrive_CPU_STP#,10 ns > 200 mV
Figure 7. CPU_STP# Deassertion Waveform
1.8 ms
CPU_STOP#
PD
CPUT(Free Running
CPUC(Free Running
CPUT(Stoppable)
CPUC(Stoppable)
DOT96T
DOT96C
Figure 8. CPU_STP#= Driven, CPU_PD = Driven, DOT_PD = Driven
......................Document #: 38-07718 Rev. *B Page 13 of 23
CY28443-2
1.8 ms
CPU_STOP#
PD
CPUT(Free Running)
CPUC(Free Running)
CPUT(Stoppable)
CPUC(Stoppable)
DOT96T
DOT96C
Figure 9. CPU_STP# = Tri-state, CPU_PD = Tri-state, DOT_PD = Tri-state
PCI_STP# Assertion
PCI_STP# Deassertion
The PCI_STP# signal is an active LOW input used for
synchronous stopping and starting the PCI outputs while the
rest of the clock generator continues to function. The set-up
time for capturing PCI_STP# going LOW is 10 ns (tSU). (See
Figure 10.) The PCIF clocks will not be affected by this pin if
their corresponding control bit in the SMBus register is set to
allow them to be free running.
The deassertion of the PCI_STP# signal will cause all PCI and
stoppable PCIF clocks to resume running in a synchronous
manner within two PCI clock periods after PCI_STP# transitions to a HIGH level.
Tsu
PCI_STP#
PCI_F
PCI
SRC 100MHz
Figure 10. PCI_STP# Assertion Waveform
Tsu
Tdrive_SRC
PCI_STP#
PCI_F
PCI
SRC 100MHz
Figure 11. PCI_STP# Deassertion Waveform
......................Document #: 38-07718 Rev. *B Page 14 of 23
CY28443-2
FS_A, FS_B,FS_C
VTT_PWRGD#
PWRGD_VRM
0.2-0.3 ms
Delay
VDD Clock Gen
Clock State
State 0
Wait for
VTT_PWRGD#
State 1
State 2
Off
Clock Outputs
State 3
On
On
Off
Clock VCO
Device is not affected,
VTT_PWRGD# is ignored
Sample Sels
Figure 12. VTT_PWRGD# Timing Diagram
S2
S1
VTT_PWRGD# = Low
Delay >0.25 ms
Sample
Inputs straps
VDD_A = 2.0V
Wait for <1.8ms
S0
Power Off
S3
VDD_A = off
Normal
Operation
Enable Outputs
VTT_PWRGD# = toggle
Figure 13. Clock Generator Power-up/Run State Diagram
......................Document #: 38-07718 Rev. *B Page 15 of 23
CY28443-2
1
Absolute Maximum Conditions
Parameter
Description
Condition
Min.
Max.
Unit
VDD
Core Supply Voltage
–0.5
4.6
V
VDD_A
Analog Supply Voltage
–0.5
4.6
V
VIN
Input Voltage
Relative to VSS
–0.5
VDD + 0.5
VDC
TS
Temperature, Storage
Non-functional
–65
150
°C
TA
Temperature, Operating Ambient
Functional
0
85
°C
TJ
Temperature, Junction
Functional
–
150
°C
ØJC
Dissipation, Junction to Case
Mil-STD-883E Method 1012.1
–
20
°C/W
ØJA
Dissipation, Junction to Ambient
JEDEC (JESD 51)
–
60
°C/W
–
V
ESDHBM
ESD Protection (Human Body Model)
MIL-STD-883, Method 3015
UL-94
Flammability Rating
At 1/8 in.
MSL
Moisture Sensitivity Level
2000
V–0
1
Multiple Supplies: The Voltage on any input or I/O pin cannot exceed the power pin during power-up. Power supply sequencing is NOT required.
DC Electrical Specifications
Parameter
Description
Condition
All VDD’s
3.3V Operating Voltage
3.3 ± 5%
Min.
Max.
Unit
3.135
3.465
V
VILI2C
Input Low Voltage
SDATA, SCLK
–
1.0
V
VIHI2C
Input High Voltage
SDATA, SCLK
2.2
–
V
VIL_FS
FS_[A,B] Input Low Voltage
VSS – 0.3
0.35
V
VIH_FS
FS_[A,B] Input High Voltage
0.7
VDD + 0.5
V
VILFS_C
FS_C Input Low Voltage
VSS – 0.3
0.35
V
VIMFS_C
FS_C Input Middle Voltage
Typical
0.7
1.7
V
VIHFS_C
FS_C Input High Voltage
Typical
VIL
3.3V Input Low Voltage
VIH
3.3V Input High Voltage
IIL
Input Low Leakage Current
IIH
VOL
2.0
VDD + 0.5
V
VSS – 0.3
0.8
V
2.0
VDD + 0.3
V
Except internal pull-up resistors, 0 < VIN < VDD
–5
5
A
Input High Leakage Current
Except internal pull-down resistors, 0 < VIN < VDD
–
5
A
3.3V Output Low Voltage
IOL = 1 mA
–
0.4
V
IOH = –1 mA
2.4
–
V
–10
10
A
3
5
pF
VOH
3.3V Output High Voltage
IOZ
High-impedance Output
Current
CIN
Input Pin Capacitance
COUT
Output Pin Capacitance
3
6
pF
LIN
Pin Inductance
–
7
nH
VXIH
Xin High Voltage
0.7VDD
VDD
V
VXIL
Xin Low Voltage
0
0.3VDD
V
IDD3.3V
Dynamic Supply Current
At max. load and freq. per Figure 16
–
300
mA
IPD3.3V
Power-down Supply Current
PD asserted, Outputs Driven
–
70
mA
IPD3.3V
Power-down Supply Current
PD asserted, Outputs Tri-state
–
5
mA
......................Document #: 38-07718 Rev. *B Page 16 of 23
CY28443-2
AC Electrical Specifications
Parameter
Description
Condition
Min.
Max.
Unit
47.5
52.5
%
69.841
71.0
ns
ns
Crystal
TDC
XIN Duty Cycle
The device will operate reliably with input
duty cycles up to 30/70 but the REF clock
duty cycle will not be within specification
TPERIOD
XIN Period
When XIN is driven from an external
clock source
T R / TF
XIN Rise and Fall Times
Measured between 0.3VDD and 0.7VDD
–
10.0
TCCJ
XIN Cycle to Cycle Jitter
As an average over 1-s duration
–
500
ps
LACC
Long-term Accuracy
Measured at crossing point VOX
–
300
ppm
TDC
CPUT and CPUC Duty Cycle
Measured at crossing point VOX
45
55
%
CPU at 0.7V
TPERIOD
100-MHz CPUT and CPUC Period
Measured at crossing point VOX
9.997001
10.00300
ns
TPERIOD
133-MHz CPUT and CPUC Period
Measured at crossing point VOX
7.497751
7.502251
ns
TPERIOD
166-MHz CPUT and CPUC Period
Measured at crossing point VOX
5.998201
6.001801
ns
TPERIOD
200-MHz CPUT and CPUC Period
Measured at crossing point VOX
4.998500
5.001500
ns
TPERIODSS
100-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX
9.997001
10.05327
ns
TPERIODSS
133-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX
7.497751
7.539950
ns
TPERIODSS
166-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX
5.998201
6.031960
ns
TPERIODSS
200-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX
4.998500
5.026634
ns
TPERIODAbs
100-MHz CPUT and CPUC Absolute
period
Measured at crossing point VOX
9.912001
10.08800
ns
TPERIODAbs
133-MHz CPUT and CPUC Absolute
period
Measured at crossing point VOX
7.412751
7.587251
ns
TPERIODAbs
166-MHz CPUT and CPUC Absolute
period
Measured at crossing point VOX
5.913201
6.086801
ns
TPERIODAbs
200-MHz CPUT and CPUC Absolute
period
Measured at crossing point VOX
4.913500
5.086500
ns
TPERIODSSAbs 100-MHz CPUT and CPUC Absolute
period, SSC
Measured at crossing point VOX
9.912001
10.13827
ns
TPERIODSSAbs 133-MHz CPUT and CPUC Absolute
period, SSC
Measured at crossing point VOX
7.412751
7.624950
ns
TPERIODSSAbs 166-MHz CPUT and CPUC Absolute
period, SSC
Measured at crossing point VOX
5.913201
6.116960
ns
TPERIODSSAbs 200-MHz CPUT and CPUC Absolute
period, SSC
Measured at crossing point VOX
4.913500
5.111634
ns
TCCJ
CPUT/C Cycle to Cycle Jitter
Measured at crossing point VOX
–
85[1]
ps
TCCJ2
CPU2_ITP Cycle to Cycle Jitter
Measured at crossing point VOX
–
125[1]
ps
LACC
Long-term Accuracy
Measured at crossing point VOX
–
300
ppm
TSKEW
CPU1 to CPU0 Clock Skew
Measured at crossing point VOX
–
100
ps
TSKEW2
CPU2_ITP to CPU0 Clock Skew
Measured at crossing point VOX
T R / TF
CPUT and CPUC Rise and Fall Time
Measured from VOL = 0.175 to
VOH = 0.525V
TRFM
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/(TR + TF)
TR
TF
–
150
ps
175
700
ps
–
20
%
Rise Time Variation
–
125
ps
Fall Time Variation
–
125
ps
Note:
1. Measured with one REF on.
......................Document #: 38-07718 Rev. *B Page 17 of 23
CY28443-2
AC Electrical Specifications (continued)
Condition
Min.
Max.
Unit
VHIGH
Parameter
Voltage High
Description
Math averages Figure 16
660
850
mV
VLOW
Voltage Low
Math averages Figure 16
–150
–
mV
VOX
Crossing Point Voltage at 0.7V Swing
250
550
mV
VOVS
Maximum Overshoot Voltage
–
VHIGH +
0.3
V
VUDS
Minimum Undershoot Voltage
–0.3
–
V
VRB
Ring Back Voltage
See Figure 16. Measure SE
–
0.2
V
TDC
SRCT and SRCC Duty Cycle
Measured at crossing point VOX
45
55
%
SRC at 0.7V
TPERIOD
100-MHz SRCT and SRCC Period
Measured at crossing point VOX
9.997001
10.00300
ns
TPERIODSS
100-MHz SRCT and SRCC Period, SSC Measured at crossing point VOX
9.997001
10.05327
ns
TPERIODAbs
100-MHz SRCT and SRCC Absolute
Period
Measured at crossing point VOX
9.872001
10.12800
ns
TPERIODSSAbs 100-MHz SRCT and SRCC Absolute
Period, SSC
Measured at crossing point VOX
9.872001
10.17827
ns
TSKEW
Any SRCT/C to SRCT/C Clock Skew
Measured at crossing point VOX
–
250
ps
TCCJ
SRCT/C Cycle to Cycle Jitter
Measured at crossing point VOX
–
125[1]
ps
LACC
SRCT/C Long Term Accuracy
Measured at crossing point VOX
TR / TF
SRCT and SRCC Rise and Fall Time
Measured from VOL = 0.175 to
VOH = 0.525V
TRFM
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/(TR + TF)
TR
Rise TimeVariation
TF
Fall Time Variation
VHIGH
Voltage High
Math averages Figure 16
VLOW
Voltage Low
Math averages Figure 16
–150
–
mV
VOX
Crossing Point Voltage at 0.7V Swing
250
550
mV
VOVS
Maximum Overshoot Voltage
–
VHIGH +
0.3
V
VUDS
Minimum Undershoot Voltage
VRB
Ring Back Voltage
–
300
ppm
175
700
ps
–
20
%
–
125
ps
–
125
ps
660
850
mV
–0.3
–
V
See Figure 16. Measure SE
–
0.2
V
96_100_SSC/SRC0 at 0.7V
TDC
SSCT and SSCC Duty Cycle
Measured at crossing point VOX
45
55
%
TPERIOD
100-MHz SSCT and SSCC Period
Measured at crossing point VOX
9.997001
10.00300
ns
TPERIODSS
100-MHz SSCT and SSCC Period, SSC Measured at crossing point VOX
9.997001
10.05327
ns
TPERIODAbs
100-MHz SSCT and SSCC Absolute
Period
Measured at crossing point VOX
9.872001
10.12800
ns
TPERIODSSAbs 100-MHz SRCT and SRCC Absolute
Period, SSC
Measured at crossing point VOX
9.872001
10.17827
ns
TPERIOD
96-MHz SSCT and SSCC Period
Measured at crossing point VOX
10.41354
10.41979
ns
TPERIODSS
96-MHz SSCT and SSCC Period, SSC Measured at crossing point VOX
10.41354
10.47215
ns
TPERIODAbs
96-MHz SSCT and SSCC Absolute
Period
Measured at crossing point VOX
10.16354
10.66979
ns
TPERIODSSAbs 96-MHz SRCT and SRCC Absolute
Period, SSC
Measured at crossing point VOX
10.16354
10.72266
ns
TCCJ
SSCT/C Cycle to Cycle Jitter
Measured at crossing point VOX
–
140
ps
LACC
SSCT/C Long Term Accuracy
Measured at crossing point VOX
–
300
ppm
......................Document #: 38-07718 Rev. *B Page 18 of 23
CY28443-2
AC Electrical Specifications (continued)
Parameter
Description
Condition
Min.
Max.
Unit
175
700
ps
–
20
%
–
125
ps
–
125
ps
660
850
mV
T R / TF
SSCT and SSCC Rise and Fall Time
Measured from VOL = 0.175 to
VOH = 0.525V
TRFM
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/(TR + TF)
TR
Rise TimeVariation
TF
Fall Time Variation
VHIGH
Voltage High
Math averages Figure 16
VLOW
Voltage Low
Math averages Figure 16
–150
–
mV
VOX
Crossing Point Voltage at 0.7V Swing
250
550
mV
VOVS
Maximum Overshoot Voltage
–
VHIGH +
0.3
V
VUDS
Minimum Undershoot Voltage
VRB
Ring Back Voltage
–0.3
–
V
See Figure 16. Measure SE
–
0.2
V
PCI/PCIF at 3.3V
TDC
PCI Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
Spread Disabled PCIF/PCI Period
Measurement at 1.5V
29.99100
30.00900
ns
TPERIODSS
Spread Enabled PCIF/PCI Period, SSC Measurement at 1.5V
29.9910
30.15980
ns
TPERIODAbs
Spread Disabled PCIF/PCI Period
Measurement at 1.5V
29.49100
30.50900
ns
TPERIODSSAbs Spread Enabled PCIF/PCI Period, SSC Measurement at 1.5V
29.49100
30.65980
ns
THIGH
PCIF and PCI high time
Measurement at 2.4V
12.0
–
ns
TLOW
PCIF and PCI low time
Measurement at 0.4V
12.0
–
ns
T R / TF
PCIF/PCI rising and falling Edge Rate
Measured between 0.8V and 2.0V
1.0
4.0
V/ns
TSKEW
Any PCI clock to Any PCI clock Skew
Measurement at 1.5V
–
500
ps
ps
TCCJ
PCIF and PCI Cycle to Cycle Jitter
Measurement at 1.5V
–
500[2]
LACC
PCIF/PCI Long Term Accuracy
Measured at crossing point VOX
–
300
ppm
TDC
DOT96T and DOT96C Duty Cycle
Measured at crossing point VOX
45
55
%
DOT96 at 0.7V
TPERIOD
DOT96T and DOT96C Period
Measured at crossing point VOX
10.41354
10.41979
ns
TPERIODAbs
DOT96T and DOT96C Absolute Period Measured at crossing point VOX
10.16354
10.66979
ns
TCCJ
DOT96T/C Cycle to Cycle Jitter
Measured at crossing point VOX
–
250
ps
LACC
DOT96T/C Long Term Accuracy
Measured at crossing point VOX
–
300
ppm
T R / TF
DOT96T and DOT96C Rise and Fall
Time
Measured from VOL = 0.175 to
VOH = 0.525V
175
700
ps
TRFM
Rise/Fall Matching
Determined as a fraction of
2*(TR – TF)/(TR + TF)
–
20
%
TR
Rise Time Variation
–
125
ps
TF
Fall Time Variation
–
125
ps
VHIGH
Voltage High
Math averages Figure 16
660
850
mV
VLOW
Voltage Low
Math averages Figure 16
–150
–
mV
VOX
Crossing Point Voltage at 0.7V Swing
250
550
mV
VOVS
Maximum Overshoot Voltage
–
VHIGH +
0.3
V
VUDS
Minimum Undershoot Voltage
–0.3
–
V
VRB
Ring Back Voltage
–
0.2
V
See Figure 16. Measure SE
Note:
2. Measured in Low drive mode.
......................Document #: 38-07718 Rev. *B Page 19 of 23
CY28443-2
AC Electrical Specifications (continued)
Parameter
Description
Condition
Min.
Max.
Unit
48_M at 3.3V
TDC
Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
Period
Measurement at 1.5V
20.83125
20.83542
ns
TPERIODAbs
Absolute Period
Measurement at 1.5V
20.48125
21.18542
ns
THIGH
48_M High time
Measurement at 2.4V
8.094
11.200
ns
TLOW
48_M Low time
Measurement at 0.4V
7.694
11.500
ns
T R / TF
Rising and Falling Edge Rate
Measured between 0.8V and 2.0V
1.0
2.0
V/ns
TCCJ
Cycle to Cycle Jitter
Measurement at 1.5V
–
350
ps
LACC
48M Long Term Accuracy
Measured at crossing point VOX
–
100
ppm
TDC
Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
Spread Disabled 27M Period
Measurement at 1.5V
27.000
27.0547
ns
Spread Enabled 27M Period
Measurement at 1.5V
27.000
27.0547
27_M at 3.3V
THIGH
27_M High time
Measurement at 2.0V
10.5
–
ns
TLOW
27_M Low time
Measurement at 0.8V
10.5
–
ns
T R / TF
Rising and Falling Edge Rate
Measured between 0.8V and 2.0V
1.0
4.4
V/ns
TCCJ
Cycle to Cycle Jitter
Measurement at 1.5V
–
520
ps
LACC
27_M Long Term Accuracy
Measured at crossing point VOX
–
0
ppm
REF at 3.3V
TDC
REF Duty Cycle
Measurement at 1.5V
45
55
%
TPERIOD
REF Period
Measurement at 1.5V
69.8203
69.8622
ns
TPERIODAbs
REF Absolute Period
Measurement at 1.5V
68.82033
70.86224
ns
T R / TF
REF Rising and Falling Edge Rate
Measured between 0.8V and 2.0V
1.0
4.0
V/ns
TSKEW
REF Clock to REF Clock
Measurement at 1.5V
–
500
ps
TCCJ
REF Cycle to Cycle Jitter
Measurement at 1.5V
–
1000
ps
LACC
Long Term Accuracy
Measurement at 1.5V
–
300
ppm
–
1.8
ms
10.0
–
ns
ENABLE/DISABLE and SET-UP
TSTABLE
Clock Stabilization from Power-up
TSS
Stopclock Set-up Time
......................Document #: 38-07718 Rev. *B Page 20 of 23
CY28443-2
Test and Measurement Set-up
For PCI Single-ended Signals and Reference
The following diagram shows test load configurations for the
single-ended PCI, USB, and REF output signals.
Measurement
Point
33
PCI/
USB
60
5 pF
Measurement
Point
12
60
REF
5 pF
Measurement
Point
12
60
5 pF
Figure 14.Single-ended Load Configuration Low Drive Option
M easurem ent
P oint
12
60
PCI/
USB
5 pF
M easurem ent
P oint
12
60
5 pF
M easurem ent
P oint
12
60
R EF
5 pF
M easurem ent
P oint
12
60
5 pF
M easurem ent
P oint
12
60
5 pF
Figure 15. Single-ended Load Configuration High Drive Option
The following diagram shows the test load configuration for the
differential CPU and SRC outputs.
CPUT
SRCT
D O T96T
96_100_SSC T
CPUC
SRCC
D O T96C
96_100_SSC C
M e a s u re m e n t
P o in t
33
4 9 .9 
2 pF
1 0 0   D if f e r e n t ia l
M e a s u re m e n t
P o in t
33
4 9 .9 
2 pF
IR E F
475
Figure 16. 0.7V Differential Load Configuration
......................Document #: 38-07718 Rev. *B Page 21 of 23
CY28443-2
3 .3 V s ig n a l s
T DC
-
-
3 .3 V
2 .4 V
1 .5 V
0 .4 V
0V
TR
TF
Figure 17. Single-ended Output Signals (for AC Parameters Measurement)
Ordering Information
Part Number
Package Type
Product Flow
Lead-free
CY28443OXC-2
56-pin SSOP
Commercial, 0 to 85C
CY28443OXC-2T
56-pin SSOP – Tape and Reel
Commercial, 0 to 85C
CY28443ZXC-2
56-pin TSSOP
Commercial, 0 to 85C
CY28443ZXC-2T
56-pin TSSOP – Tape and Reel
Commercial, 0 to 85C
......................Document #: 38-07718 Rev. *B Page 22 of 23
CY28443-2
Package Diagrams
56-Lead Thin Shrunk Small Outline Package, Type II (6 mm x 12 mm) Z56
0.249[0.009]
28
1
DIMENSIONS IN MM[INCHES] MIN.
MAX.
REFERENCE JEDEC MO-153
7.950[0.313]
8.255[0.325]
PACKAGE WEIGHT 0.42gms
5.994[0.236]
6.198[0.244]
PART #
Z5624 STANDARD PKG.
ZZ5624 LEAD FREE PKG.
29
56
13.894[0.547]
14.097[0.555]
1.100[0.043]
MAX.
GAUGE PLANE
0.25[0.010]
0.20[0.008]
0.851[0.033]
0.950[0.037]
0.500[0.020]
BSC
0.051[0.002]
0.152[0.006]
0.170[0.006]
0.279[0.011]
0.508[0.020]
0.762[0.030]
0°-8°
0.100[0.003]
0.200[0.008]
SEATING
PLANE
56-Lead Shrunk Small Outline Package O56
.020
1
28
0.395
0.420
0.292
0.299
DIMENSIONS IN INCHES MIN.
MAX.
29
56
0.720
0.730
SEATING PLANE
0.088
0.092
0.095
0.110
0.005
0.010
.010
GAUGE PLANE
0.110
0.025
BSC
0.008
0.0135
0.008
0.016
0°-8°
0.024
0.040
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the
use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or
parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to
support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
......................Document #: 38-07718 Rev. *B Page 23 of 23