Cypress Semiconductor CY25822-2 Manuel utilisateur

CK-SSC Spread Spectrum Clock Generato

CY25822-

Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600

Document #: 38-07531 Rev. ** Revised March 18, 2003

Features

• 3.3V operation

• 48- and 66-MHz frequency support

• Selectable slew rate control

• 350-pS jitter

•I

2C programmability

• 500-µA power-down current

• SpreadSpectrumforbestelectromagneticinterference

(EMI) reduction

• 8-pin SOIC package

Block Diagram

Pin Configuration

CLKIN

VDD

GND

*PWRDWN#

SCLOCK

SDATA

REFOUT

CY25822-2

CLKOUT

* 150KΩ Pull-up

Freq. Phase

Modulating

VCO Post CLKOUT

Detector Charge

Pump

Waveform

DividersDivider

Feedback

Divider

PLL

GND

VDD

Clock Input (SSCG Output)

REFOUT

Logic

Control

SDATA

SCLOCK

PWRDWN#

[+] Feedback

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Document #: 38-07531 Rev. ** Page 2 of 9

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, etc., 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 can also 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 operation 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 individual indexed bytes. The

offset of the indexed byte is encoded in the command code, as

described in Table 1.

The block write and block read protocol is outlined in Table 2

while Table 3 outlines the corresponding byte write and byte

read protocol.The slave receiver address is 11010100 (D4h).

Pin Description

Pin No. Pin Name Pin Type Pin Description

1 CLKIN Input 48-MHz or 66-MHz Clock Input.

2 VDD Power Power Supply for PLL and Outputs.

3 GND Ground Ground for Outputs.

4 CLKOUT Output 48-MHz or 66-MHz Spread Spectrum Clock Output.

5REFOUTOutputNon-spread Spectrum Reference Clock Output.

6 SDATA I/O I2C-compatible SDATA.

7 SCLOCK Input I2C-compatible SCLOCK.

8 PWRDWN# Output LVTTL Input for PowerDown# Active Low.

Table 1. Command Code Definition

Bit Description

7 0 = Block read or block write operation

1 = Byte read or byte write operation

(6:0) Byte offset for byte read or byte write operation. For block read or block write operations, these bits should be ’0000000’

Table 2. Block Read and Block Write Protocol

Block Write Protocol Block Read Protocol

Bit Description Bit Description

1Start 1Start

2:8 Slave address – 7 bits 2:8 Slave address – 7 bits

9 Write = 0 9 Write = 0

10 Acknowledge from slave 10 Acknowledge from slave

11:18 Command Code – 8 bits

'00000000' stands for block operation 11:18 Command Code – 8 bits

'00000000' stands for block operation

19 Acknowledge from slave 19 Acknowledge from slave

20:27 Byte Count – 8 bits 20 Repeat start

28 Acknowledge from slave 21:27 Slave address – 7 bits

29:36 Data byte 1 – 8 bits 28 Read = 1

37 Acknowledge from slave 29 Acknowledge from slave

38:45 Data byte 2 – 8 bits 30:37 Byte count from slave – 8 bits

46 Acknowledge from slave 38 Acknowledge

.... ...................... 39:46 Data byte from slave – 8 bits

.... Data Byte (N–1) –8 bits 47 Acknowledge

.... Acknowledge from slave 48:55 Data byte from slave – 8 bits

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Document #: 38-07531 Rev. ** Page 3 of 9

.... Data Byte N –8 bits 56 Acknowledge

.... Acknowledge from slave .... Data bytes from slave/Acknowledge

.... Stop .... Data byte N from slave – 8 bits

.... Not Acknowledge

.... Stop

Table 2. Block Read and Block Write Protocol (continued)

Table 3. Byte Read and Byte Write Protocol

Byte Write Protocol Byte Read Protocol

Bit Description Bit Description

1Start 1Start

2:8 Slave address – 7 bits 2:8 Slave address – 7 bits

9 Write = 0 9 Write = 0

10 Acknowledge from slave 10 Acknowledge from slave

11:18 Command Code – 8 bits

'1xxxxxxx' stands for byte operation, bits[6:0] of

the command code represents the offset of the

byte to be accessed

11:18 Command Code – 8 bits

'1xxxxxxx' standsfor byteoperation, bits[6:0]

of the command code represents the offset of

the byte to be accessed

19 Acknowledge from slave 19 Acknowledge from slave

20:27 Data byte from master – 8 bits 20 Repeat start

28 Acknowledge from slave 21:27 Slave address – 7 bits

29 Stop 28 Read = 1

29 Acknowledge from slave

30:37 Data byte from slave – 8 bits

38 Not Acknowledge

39 Stop

Byte 0: Control Register

Bit @Pup Pin# Name Pin Description

714SS0 –

604SS1 –

504SS2 –

404SS3 –

3 1 Not Applicable Reserved, must be written as 1

214,5CLKOUT,

REFOUT Power-down three-state enable

0 = three-state outputs, 1 = drive outputs low

(Applies only in Power Down State)

1 1 4 CLKOUT Spread Spectrum enable

0 = spread off, 1 = spread on

0 0 Not Applicable No Pins

Table 4. Spread Spectrum Select

SS3 SS2 SS1 SS0 Spread Mode Spread Amount%

0 0 0 0 Down 0.8

0 0 0 1 Down 1.0

0 0 1 0 Down 1.25

0 0 1 1 Down 1.5

0 1 0 0 Down 1.75

[+] Feedback

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Document #: 38-07531 Rev. ** Page 4 of 9

Bytes 2 through 5: Reserved Registers PWRDWN# (Power-down) Clarification

The PWRDWN# (Power-down) pin is used to shut off ALL

clocks prior to shutting off power to the device. PWRDWN# is

an asynchronous active LOW input. This signal is synchro-

nized internally to the device powering down the clocksynthe-

sizer.PWRDWN#isanasynchronousfunctionforpoweringup

the system. When PWRDWN# is low, all clocks are driven to

a LOW value and held there and the VCO and PLLs are also

powered down. All clocks are shut down in a synchronous

manner so has not to cause glitches while transitioning to the

low ‘stopped’ state. When PWRDWN# is deasserted the

clocks should remain stopped until the VCO is stable and

within specification (tSTABLE). A stopped clock is either

tri-stated or driven low depending on the state of the tri-state

enable I2C register bit. CY25822 clocks that are stopped in the

driven state are driven low.

The CLKIN input must be on and within specified operating

parameters before PWRDWN# is asserted and it must remain

in this state while PWRDWN# is asserted.

0 1 0 1 Down 2.0

0 1 1 0 Down 2.5

0 1 1 1 Down 3.0

1000 Center ±0.3

1001 Center ±0.4

1010 Center ±0.5

1011 Center ±0.6

1100 Center ±0.8

1101 Center ±1.0

1110 Center ±1.25

1111 Center ±1.5

Table 4. Spread Spectrum Select (continued)

SS3 SS2 SS1 SS0 Spread Mode Spread Amount%

Byte 1: Control Register

Bit @Pup Pin# Name Pin Description

7 1 5 REFEN REFOUT enable

0 = disabled, 1 = enabled

6 1 5 REFSLEW REFOUT edge rate control

0 = slow, 1 = nominal

5 0 Not Applicable Reserved.

4 0 Not Applicable Reserved

3 1 4 CLKSLEW CLKOUT edge rate control

0 = slow, 1 = nominal

2 1 4 CLKEN CLKOUT enable

0 =disabled, 1 = enabled

1 0 Not Applicable Reserved

0 0 Not Applicable Reserved

Byte 6: Vendor/Revision ID Register

Bit @Pup Pin# Name Pin Description

7 0 – – Revision ID Bit 3

6 0 – – Revision ID Bit 2

5 0 – – Revision ID Bit 1

4 0 – – Revision ID Bit 0

3 1 – – Vendor ID Bit 3

2 0 – – Vendor ID Bit 2

1 0 – – Vendor ID Bit 1

0 0 – – Vendor ID Bit 0

[+] Feedback

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Document #: 38-07531 Rev. ** Page 5 of 9

CLKOUT and REFOUT Enable Clarification

TheCLKOUTenableandREFOUTenableI2Cregisterbitsare

used to shot-off the CLKOUTand REFOUTclocks individually.

The VCO and crystal oscillator must remain on. A shutdown

clock is driven low. ALL clocks need to be stopped in a

predictable manner. All clocks need to be shutdown without

any glitches or other abnormal behavior while transitioning to

a stopped state. Similarly when CLKOUT or REFOUT is

enabled the clock must start in a predictable manner without

any glitches or abnormal behavior.

REFOUT

PWRDWN#

CLKOUT

Figure 1. Power-down Assertion

PD#

CLKOUT

REFOUT

<3.0ms

Figure 2. Power-down Deassertion

[+] Feedback

CY25822

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Document #: 38-07531 Rev. ** Page 6 of 9

Table 5. Absolute Maximum Ratings

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 V SS –0.5 VDD + 0.5 VDC

TSTemperature, Storage Non Functional –65 +150 °C

TATemperature, Operating Ambient Functional 0 70 °C

TJTemperature, Junction Functional – 150 °C

ESDHBM ESD Protection (Human Body Model) MIL-STD-883, Method 3015 2000 – Volts

UL–94 Flammability Rating @1/8 in. V–0

MSL Moisture Sensitivity Level 1

Table 6. DC Parameters (TA= 0°C to +70°C, VDD = 3.3V ± 5%)

Parameter Description Condition Min. Max Unit Notes

VDD Supply Voltage – 3.135 3.465 V VDD = 3.3 ± 5%

VIH Input High Voltage – 2.0 VDD + 0.3 V

VIL Input Low Voltage – VSS – 0.3 0.8 V

IIL1 Input Leakage Current SCLOCK

or SDATA –25 +25 µA

IIL2 Input Leakage Current PWRDWN# –75 –15 µA

VOH Output High Voltage IOH = –4 mA 2.4 – V Single edge is required to

be monotonic when transi-

tioningthroughthis region.

VOL Output Low Voltage IOL = 4 mA – 0.4 V Single edge is required to

be monotonic when transi-

tioningthroughthis region.

CIN Input Pin Capacitance – – 5 pF

COUT Output Pin Capacitance – – 6 pF

LIN Pin Inductance – – 7 nH

TAAmbient Temperature – 0 70 °C No air flow

IDD1 Supply Current @ 66 MHz – 50 mA

IDD2 Supply Current @ 48 MHz – 40 mA

IPD Power Down Supply Current – – 500 µA

Table 7. AC Parameters (TA= 0°C to +70°C, VDD = 3.3V ± 5%)

Parameter Description Conditions Min. Max. Unit Notes

tHIGH CLK High Time, 48MHz Measured @2.4V 9.45 10.95 ns Specification applies to

48MHz output mode.

tLOW CLK, Low Time, 48MHz Measured @0.4V 8.50 10.10 ns Specification applies to

48MHz output mode.

tHIGH CLK High Time, 66MHz Measured @2.4V 6.85 7.90 ns Specification applies to

66.7MHz output mode.

tLOW CLK Low Time, 66MHz Measured @0.4V 5.95 6.95 ns Specification applies to

66.7MHz output mode.

tRISEH1 Rising Edge Rate Measured from 0.4V to 2.4V

REFOUT and CLOCKOUT 2.0 5.0 V/ns High Buffer Strength

Refer to I2C Control

tFALLH1 Falling Edge Rate Measured from 2.4V to 0.4V

REFOUT and CLOCKOUT 2.0 5.0 V/ns High Buffer Strength

Refer to I2C Control

tRISEL1 Rising Edge Rate Measured from 0.4V to 2.4V

REFOUT and CLOCKOUT 1.33 4.0 V/ns Low Buffer Strength

Refer to I2C Control

[+] Feedback

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Document #: 38-07531 Rev. ** Page 7 of 9

tFALLL1 Falling Edge Rate Measured from 2.4V to 0.4V

REFOUT and CLOCKOUT 1.33 4.0 V/ns Low Buffer Strength

Refer to I2C Control

tRISEH2 Rise Time Measured from 0.4V to 2.4V

REFOUT and CLOCKOUT 0.4 1.0 ns High Buffer Strength

Refer to I2C Control

tFALLH2 Fall Time Measured from 2.4V to 0.4V

REFOUT and CLOCKOUT 0.4 1.0 ns High Buffer Strength

Refer to I2C Control

tRISEL2 Rise Time Measured from 0.4V to 2.4V

REFOUT and CLOCKOUT 0.5 1.5 ns Low Buffer Strength

Refer to I2C Control

tFALLL2 Fall Time Measured from 2.4V to 0.4V

REFOUT and CLOCKOUT 0.5 1.5 ns Low Buffer Strength

Refer to I2C Control

TCYC1 Cycle to Cycle Jitter REFOUT – 500 ps SSCG is ON

TCYC2 Cycle to Cycle Jitter CLOCKOUT – 250 ps SSCG is ON

LTJ 10µS Period Jitter

(100KHz,FrequencyMod-

ulation Amplitude)

Applies to REFOUT at all

timesandCLOCKOUTwhen

SSCG is Off

–2.0ns –

tSTART Start up time From VDD = 2.0 V – 3.0 ms All outputs disabled

Table 7. AC Parameters (TA= 0°C to +70°C, VDD = 3.3V ± 5%) (continued)

Parameter Description Conditions Min. Max. Unit Notes

Table 8. Signal Loading Table

Clock Name Max Load (pF)

CLKOUT, REFOUT 15

Ordering Information

Part Number Package Type Product Flow

CY25822SC–2 8-pin SOIC Commercial, 0°C to 70°C

CY25822SC–2T 8-pin SOIC – Tape and Reel Commercial, 0°C to 70°C

[+] Feedback

CY25822-

Document #: 38-07531 Rev. ** Page 8 of 9

of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nordoes it convey or implyany license underpatent or otherrights. Cypress Semiconductordoes not authorize

its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress

Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.

Package Diagram

Purchase of I2C components from Cypress, or one of its sublicensed Associated Companies, conveys alicense under thePhilips

I2C Patent Rightsto use these components in an I2Csystem, provided that the system conforms to the I2CStandardSpecification

as defined by Philips.All product and company names mentioned in this document are trademarks of their respective holders.

8-lead (150-Mil) SOIC – S8

51-85066-*B

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CY25822

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Document #: 38-07531 Rev. ** Page 9 of 9

Document History Page

Document Title: CY25822-2 CK-SSC Spread Spectrum Clock Generator

Document Number: 38-07531

REV. ECN NO. Issue

Date Orig. of

Change Description of Change

** 124462 03/19/03 RGL New Data Sheet

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