CYIFS781BSXC

CYIFS781BSXC Datasheet

CYIFS781BSXC

Part	Datasheet
CYIFS781BSXC	CYIFS781BSXC (pdf)

Related Parts	Information
CYIFS784BSXCT	CYIFS784BSXCT
CYIFS782BSXCT	CYIFS782BSXCT
CYIFS782BSXC	CYIFS782BSXC
CYIFS784BSXC	CYIFS784BSXC
CYIFS781BSXCT	CYIFS781BSXCT
CYIFS781BZXC	CYIFS781BZXC
CYIFS781BZXCT	CYIFS781BZXCT

PDF Datasheet Preview
FS781/82/84 Low EMI Spectrum Spread Clock • Spread Spectrum clock generator SSCG with 1x, 2x, and 4x outputs • 6- to 82-MHz operating frequency range • Modulates external clocks including crystals, crystal oscillators, or ceramic resonators • Programmable modulation with simple R-C external loop filter LF • Center spread modulation • 3V-5V power supply • TTL-/CMOS-compatible outputs • Low short-term jitter • Low-power Dissipation VDC = 37 mW typical VDC = 115 mW typical • Available in 8-pin SOIC and TSSOP packages • Desktop/notebook computers • Printers, copiers, and MFP • Scanners and fax • LCD displays and monitors • CD-ROM, VCD, and DVD • Automotive and embedded systems • Networking, LAN/WAN • Digital cameras and camcorders • Modems • Programmable EMI reduction • Fast time to market • Lower cost of compliance • No degradation in rise/fall times • Lower component and PCB layer count Functional Description The Cypress FS781/82/84 are Spread Spectrum clock generator ICs SSCG designed for the purpose of reducing electromagnetic interference EMI found in today’s high-speed digital systems. The FS781/82/84 SSCG clocks use a Cypress-proprietary technology to modulate the input clock frequency, XIN, by modulating the frequency of the digital clock. By modulating the reference clock the measured EMI at the fundamental and harmonic frequencies of FSOUT is greatly reduced. This reduction in radiated energy can significantly reduce the cost of complying with regulatory requirements without degrading digital waveforms. The Cypress FS781/82/84 clocks are very simple and versatile devices to use. By programming the two range select lines, S0 and S1, any frequency from 6- to 82-MHz operating range can be selected. The FS781/2/4 are designed to operate over a very wide range of input frequencies and provides 1x, 2x, and 4x modulated clock outputs. The FS78x devices have a simple frequency selection table that allows operation from 6 MHz to 82 MHz in four separate ranges. The bandwidth of the frequency spread at FSOUT is determined by the values of the loop filter components. The modulation rate is determined internally by the input frequency and the selected input frequency range. The Bandwidth of these products can be programmed from as little as up to as much as by selecting the proper loop filter value. Refer to the Loop Filter Selection chart in Table 2 and Table 3 for the recommended values. Due to a wide range of application requirements, an external loop filter LF is used on the FS78x products. The user can select the exact amount of frequency modulation suitable for the application. Using a fixed internal loop filter would severely limit the use of a wide range of modulation bandwidths Spread % to a few discrete values. Refer to FS791/2/4 products for applications requiring 80- to 140-MHz frequency range. Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600 [+] Feedback FS781/82/84 Block Diagram 250 K Xin 1 3 Xout 2 4 VDD 8 2 Power Contol Logic Reference Divider Modulation Control VDD Input Control Logic Loop Filter Phase Detector 10 pF. Pin Configuration Xin 1 8 VDD Xout S1 2 FS78x 7 S0 FSOUT 5 VSS 8 Pin SOIC Package VCO / N VSS Output Divider and Mux TSSOP Pin # Ordering Information[8] Package Type IMIFS781BZB 8-pin 150-mil SOIC IMIFS781BZBT 8-pin 150-mil SOIC Tape and Reel IMIFS782BZB 8-pin 150-mil SOIC IMIFS782BZBT 8-pin 150-mil SOIC Tape and Reel IMIFS784BZB 8-pin 150-mil SOIC IMIFS784BZBT 8-pin 150-mil SOIC Tape and Reel IMIFS781BT 8-pin mm body TSSOP IMIFS781BTT 8-pin mm body TSSOP Tape and Reel IMIFS784BT 8-pin mm body TSSOP IMIFS784BTT 8-pin mm body TSSOP Tape and Reel Lead-free CYIFS781BSXC 8-pin 150-mil SOIC CYIFS781BSXCT 8-pin 150-mil SOIC Tape and Reel CYIFS782BSXC 8-pin 150-mil SOIC CYIFS782BSXCT 8-pin 150-mil SOIC Tape and Reel CYIFS784BSXC 8-pin 150-mil SOIC CYIFS784BSXCT 8-pin 150-mil SOIC Tape and Reel CYIFS781BZXC 8-pin mm body TSSOP CYIFS781BZXCT 8-pin mm body TSSOP Tape and Reel CYIFS782BZXC 8-pin mm body TSSOP Note The ordering part number differs from the marking on the actual device. Product Flow Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Page 9 of 12 [+] Feedback Marking Example Cypress FS781BS Date Code, Lot # FS781 B S Cypress FS781BT Date Code, Lot # Package S = SOIC T = TSSOP FS781/82/84 Cypress Device Driver Package Drawing and Dimensions 8 Lead 150 Mil SOIC S08 8-lead 150-Mil SOIC S8 PIN 1 ID DIMENSIONS IN INCHES[MM] MIN. MAX. PIN 1 ID IS OPTIONAL, ROUND ON SINGLE LEADFRAME RECTANGULAR ON MATRIX LEADFRAME REFERENCE JEDEC MS-012 PACKAGE WEIGHT 0.07gms PART # S08.15 STANDARD PKG. SZ08.15 LEAD FREE PKG. SEATING PLANE X 45° 0°~8° 51-85066-C Page 10 of 12 [+] Feedback Package Drawing and Dimensions continued 8-Lead Thin Shrunk Small Outline Package MM Body Z8 FS781/82/84 PIN 1 ID DIMENSIONS IN MM[INCHES] MIN. MAX. BSC. MAX. SEATING PLANE GAUGE PLANE 0° -8° 51-85093-A All product and company names mentioned in this document may be the trademarks of their respective holders. Page 11 of 12 Cypress Semiconductor Corporation, The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does 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 314274 See ECN RGL Fixed the Ordering Information to match the DevMaster 417662 See ECN RGL Added Maximum Junction Temperature in Absolute Maximum Ratings table Page 12 of 12 [+] Feedback

PDF Datasheet Preview

FS781/82/84

Low EMI Spectrum Spread Clock
• Spread Spectrum clock generator SSCG with 1x, 2x, and 4x outputs
• 6- to 82-MHz operating frequency range
• Modulates external clocks including crystals, crystal
oscillators, or ceramic resonators
• Programmable modulation with simple R-C external
loop filter LF
• Center spread modulation
• 3V-5V power supply
• TTL-/CMOS-compatible outputs
• Low short-term jitter
• Low-power Dissipation

VDC = 37 mW typical VDC = 115 mW typical
• Available in 8-pin SOIC and TSSOP packages
• Desktop/notebook computers
• Printers, copiers, and MFP
• Scanners and fax
• LCD displays and monitors
• CD-ROM, VCD, and DVD
• Automotive and embedded systems
• Networking, LAN/WAN
• Digital cameras and camcorders
• Modems
• Programmable EMI reduction
• Fast time to market
• Lower cost of compliance
• No degradation in rise/fall times
• Lower component and PCB layer count

Functional Description

The Cypress FS781/82/84 are Spread Spectrum clock generator ICs SSCG designed for the purpose of reducing electromagnetic interference EMI found in today’s high-speed digital systems.

The FS781/82/84 SSCG clocks use a Cypress-proprietary technology to modulate the input clock frequency, XIN, by modulating the frequency of the digital clock. By modulating the reference clock the measured EMI at the fundamental and harmonic frequencies of FSOUT is greatly reduced. This reduction in radiated energy can significantly reduce the cost of complying with regulatory requirements without degrading digital waveforms.

The Cypress FS781/82/84 clocks are very simple and versatile devices to use. By programming the two range select lines, S0 and S1, any frequency from 6- to 82-MHz operating range can be selected. The FS781/2/4 are designed to operate over a very wide range of input frequencies and provides 1x, 2x, and 4x modulated clock outputs.

The FS78x devices have a simple frequency selection table that allows operation from 6 MHz to 82 MHz in four separate ranges. The bandwidth of the frequency spread at FSOUT is determined by the values of the loop filter components. The modulation rate is determined internally by the input frequency and the selected input frequency range.

The Bandwidth of these products can be programmed from as little as up to as much as by selecting the proper loop filter value. Refer to the Loop Filter Selection chart in Table 2 and Table 3 for the recommended values. Due to a wide range of application requirements, an external loop filter LF is used on the FS78x products. The user can select the exact amount of frequency modulation suitable for the application. Using a fixed internal loop filter would severely limit the use of a wide range of modulation bandwidths Spread % to a few discrete values. Refer to FS791/2/4 products for applications requiring 80- to 140-MHz frequency range.

Cypress Semiconductor Corporation
• 198 Champion Court
• San Jose, CA 95134-1709
• 408-943-2600
[+] Feedback

FS781/82/84

Block Diagram
250 K

Xin 1 3

Xout 2 4

VDD 8 2

Power Contol Logic

Reference Divider

Modulation Control

VDD Input Control Logic

Loop Filter

Phase Detector
10 pF.

Pin Configuration

Xin 1
8 VDD

Xout S1
2 FS78x 7

S0 FSOUT
5 VSS
8 Pin SOIC Package

VCO / N VSS

Output Divider and Mux

TSSOP Pin #
Ordering Information[8]

Package Type

IMIFS781BZB
8-pin 150-mil SOIC

IMIFS781BZBT
8-pin 150-mil SOIC Tape and Reel

IMIFS782BZB
8-pin 150-mil SOIC

IMIFS782BZBT
8-pin 150-mil SOIC Tape and Reel

IMIFS784BZB
8-pin 150-mil SOIC

IMIFS784BZBT
8-pin 150-mil SOIC Tape and Reel

IMIFS781BT
8-pin mm body TSSOP

IMIFS781BTT
8-pin mm body TSSOP Tape and Reel

IMIFS784BT
8-pin mm body TSSOP

IMIFS784BTT
8-pin mm body TSSOP Tape and Reel

Lead-free

CYIFS781BSXC
8-pin 150-mil SOIC

CYIFS781BSXCT
8-pin 150-mil SOIC Tape and Reel

CYIFS782BSXC
8-pin 150-mil SOIC

CYIFS782BSXCT
8-pin 150-mil SOIC Tape and Reel

CYIFS784BSXC
8-pin 150-mil SOIC

CYIFS784BSXCT
8-pin 150-mil SOIC Tape and Reel

CYIFS781BZXC
8-pin mm body TSSOP

CYIFS781BZXCT
8-pin mm body TSSOP Tape and Reel

CYIFS782BZXC
8-pin mm body TSSOP
Note The ordering part number differs from the marking on the actual device.

Product Flow Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C

Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C Commercial, 0 to 70°C

Page 9 of 12 [+] Feedback

Marking Example

Cypress FS781BS Date Code, Lot #

FS781 B S

Cypress FS781BT Date Code, Lot #

Package S = SOIC T = TSSOP

FS781/82/84

Cypress Device Driver

Package Drawing and Dimensions
8 Lead 150 Mil SOIC S08 8-lead 150-Mil SOIC S8

PIN 1 ID

DIMENSIONS IN INCHES[MM] MIN.

MAX.

PIN 1 ID IS OPTIONAL, ROUND ON SINGLE LEADFRAME RECTANGULAR ON MATRIX LEADFRAME

REFERENCE JEDEC MS-012 PACKAGE WEIGHT 0.07gms

PART # S08.15 STANDARD PKG. SZ08.15 LEAD FREE PKG.

SEATING PLANE

X 45°
0°~8°
51-85066-*C

Page 10 of 12 [+] Feedback

Package Drawing and Dimensions continued
8-Lead Thin Shrunk Small Outline Package MM Body Z8

FS781/82/84

PIN 1 ID

DIMENSIONS IN MM[INCHES] MIN. MAX.

BSC.

MAX.

SEATING PLANE

GAUGE PLANE
0° -8°
51-85093-*A

All product and company names mentioned in this document may be the trademarks of their respective holders.

Page 11 of 12

Cypress Semiconductor Corporation, The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does 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
314274 See ECN RGL Fixed the Ordering Information to match the DevMaster
417662 See ECN RGL Added Maximum Junction Temperature in Absolute Maximum Ratings table

Page 12 of 12 [+] Feedback

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived CYIFS781BSXC Datasheet file may be downloaded here without warranties.

Datasheet ID: CYIFS781BSXC 508272