SY89875UMI [MICROCHIP]

Low Skew Clock Driver, 89875 Series, 2 True Output(s), 0 Inverted Output(s), 3 X 3 MM, MLF-16;


型号：	SY89875UMI
厂家：	MICROCHIP
描述：	Low Skew Clock Driver, 89875 Series, 2 True Output(s), 0 Inverted Output(s), 3 X 3 MM, MLF-16 驱动逻辑集成电路
文件：	总10页 (文件大小：197K)
中文：	中文翻译
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Precision Edge^®

2.5V, 2.0GHz ANY DIFF. IN-TO-LVDS

PROGRAMMABLE CLOCK DIVIDER AND 1:2

FANOUT BUFFER W/ INTERNAL TERMINATION

Micrel, Inc.

SY89875U

Precision Edge

SY89875U

FEATURES

DESCRIPTION

Integrated programmable clock divider and 1:2

This low-skew, low-jitter device is capable of accepting a

high-speed (e.g., 622MHz or higher) CML, LVPECL, LVDS

or HSTL clock input signal and dividing down the frequency

using a programmable divider to create a lower speed

version of the input clock. Available divider ratios are 2, 4, 8

and 16, or straight pass-through.

fanout buffer

Guaranteed AC performance over temperature and

voltage:

• > 2.0GHz f

MAX

• < 200ps t /t

r f

• < 15ps within device skew

The differential input buffer has a unique internal

termination design that allows access to the termination

Low jitter design:

network through a V pin. This feature allows the device to

• < 10ps total jitter

easily interface to different logic standards. A V

• < 1ps

cycle-to-cycle jitter

REF-AC

RMS

reference is included for AC-coupled applications.

Unique input termination and V Pin for DC-coupled

The /RESET input asynchronously resets the divider. In

the pass-through function (divide by 1) the /RESET

synchronously enables or disables the outputs on the next

falling edge of IN (rising edge of /IN).

and AC-coupled Inputs; CML, PECL, LVDS and

HSTL

LVDS compatible outputs

TTL/CMOS inputs for select and reset

Parallel programming capability

Programmable divider ratios of 1, 2, 4, 8 and 16

Low voltage operation 2.5V

Output disable function

–40°C to 85°C temperature range

Available in 16-pin (3mm x 3mm) MLF package

TYPICAL PERFORMANCE

APPLICATIONS

OC-12 to OC-3

Translator/Divider

SONET/SDH line cards

Transponders

High-end, multiprocessor servers

CML/LVPECL/LVDS

622MHz

LVDS

155.5MHz

Clock Out

Divide-by-4

Clock In

FUNCTIONAL BLOCK DIAGRAM

622MHz In

/IN

155.5MHz Out

/Q0

Precision Edge is a registered trademark of Micrel, Inc.

MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.

Rev.: D

Amendment: /0

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Issue Date: August 2007

Precision Edge^®

SY89875U

Micrel, Inc.

PACKAGE/ORDERING INFORMATION

Ordering Information(1)

Package Operating

Package

Marking

Lead

Finish

16 15 14 13

Part Number

Type

Range

SY89875UMI

MLF-16

Industrial

875U

Sn-Pb

/Q0

SY89875UMITR⁽²⁾

SY89875UMG⁽³⁾

VREF-AC

/IN

875U with

NiPdAu

/Q1

Pb-Free bar line indicator Pb-Free

875U with NiPdAu

Pb-Free bar line indicator Pb-Free

SY89875UMGTR^{(2, 3)}MLF-16

Industrial

Notes:

1. Contact factory for die availability. Dice are guaranteed at T = 25°C, DC Electricals only.

2. Tape and Reel.

16-Pin MLF (MLF-16)

3. Pb-Free package is recommended for new designs.

PIN DESCRIPTION

Pin Number

Pin Name

Pin Function

12, 9

IN, /IN

Differential Input: Internal 50ý termination resistors to V_Tinput. Flexible input accepts any

differential input. See “Input Interface Applications” section.

1, 2, 3, 4

16, 15, 5

Q0, /Q0

Q1, /Q1

Differential Buffered LVDS Outputs: Divided by 1, 2, 4, 8 or 16. See “Truth Table.”

Unused output pairs must be terminated with 100ý across the different pair.

S0, S1, S2

Select Pins: See “Truth Table.” LVTTL/CMOS logic levels. Internal 25ký pull-up resistor.

Logic HIGH if left unconnected (divided by 16 mode.) Input threshold is V_CC/2.

No Connect.

/RESET,

/DISABLE

LVTTL/CMOS Logic Levels: Internal 25ký pull-up resistor. Logic HIGH if left unconnected.

Apply LOW to reset the divider (divided by 2, 4, 8 or 16 mode). Also acts as a disable/enable

function. The reset and disable function occurs on the next high-to-low clock input transition.

Input threshold is V_CC/2.

VREF-AC

Reference Voltage: Equal to V_CC–1.4V (approx.). Used for AC-coupled applications only.

Decouple the V_REF–ACpin with a 0.01µF capacitor. See “Input Interface Applications” section.

Termination Center-Tap: For CML or LVDS inputs, leave this pin floating. Otherwise, See

Figures 4a to 4f, “Input Interface Applications” section.

7, 14

VCC

Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitor.

GND

Ground. Exposed pad must be connected to the same potential as the GND pin.

Exposed

TRUTH TABLE

/RESET⁽¹⁾S2

S0 Outputs

Reference Clock (pass through)

Reference Clock ÷2

Reference Clock ÷4

Reference Clock ÷8

Reference Clock ÷16

0⁽¹⁾

Q = LOW, /Q = HIGH

Clock Disable

Note 1. Reset/Disable function is asserted on the next clock input

(IN, /IN) high-to-low transition.

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

Absolute Maximum Ratings^{(Note 1)}

Operating Ratings^{(Note 2)}

Supply Voltage (V )................................... –0.5V to +4.0V

Supply Voltage (V )......................................... +2.5V ±5%

Input Voltage (V ) ...................................–0.5V to V +0.3 Ambient Temperature (T ) .........................–40°C to +85°C

ECL Output Current (I

)

Package Thermal Resistance

OUT

Continuous ..........................................................50mA

MLF (θ )

Surge.................................................................100mA

Still-Air ............................................................. 60°C/W

500lfpm ........................................................... 54°C/W

Input Current IN, /IN (I ) ......................................... ±50mA

MLF (ψ ), Note 4

V Current (I ) ...................................................... ±100mA

Junction-to-Board............................................ 32°C/W

Sink/Source Current (I

), Note 3 ...... ±2mA

REF-AC

VREF-AC

Lead Temperature (soldering 20 sec.) ...................... 260°C

Storage Temperature (T ) ........................–65°C to +150°C

Note 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is

not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng

conditions for extended periods may affect device reliability.

Note 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.

Note 3. Due to the limited drive capability use for input of the same package only.

Note 4. Junction-to-board resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the pcb.

(Notes 1, 2)

DC ELECTRICAL CHARACTERISTICS

T_A= –40°C to +85°C; Unless otherwise stated.

Symbol

V_CC

Parameter

Condition

Min

Typ

Max

2.625

Units

Power Supply

2.375

I_CC

Power Supply Current

No load, max. V_CC

R_IN

Differential Input Resistance

(IN-to-/IN)

100

110

V_IH

Input High Voltage (IN, /IN)

Input Low Voltage (IN, /IN)

Input Voltage Swing

Note 3

Note 4

Note 5

Note 3

Note 6

0.1

–0.3

0.1

0.2

–

V_CC+0.3

V_IH–0.1

V_CC

V_IL

V_IN

V_{DIFF_IN}

|I_IN|

Differential Input Voltage Swing

Input Current (IN, /IN)

–

V_REF–AC

Reference Voltage

V_CC–1.525 V_CC–1.425 V_CC–1.325

Note 1. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.

Note 2. Specification for packaged product only.

Note 3. Due to the internal termination (see Figure 2a) the input current depends on the applied voltages at IN, /IN and V inputs. Do not apply a combination

of voltages that causes the input current to exceed the maximum limit!

Note 4. See “Timing Diagram” for V definition. V (Max) is specified when V is floating.

Note 5. See “Typical Operating Characteristics” section for V

definition.

DIFF

Note 6. Operating using V is limited to AC-coupled PECL or CML applications only. Connect directly to V pin.

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

(Notes 1, 2)

LVDS DC ELECTRICAL CHARACTERISTICS

V_CC= 2.5V ±5%; T_A= –40°C to +85°C; Unless otherwise stated.

Symbol

V_OUT

V_OH

Parameter

Condition

Note 3, 4

Note 3

Min

Typ

Max

400

Units

Output Voltage Swing

Output High Voltage

250

350

1.475

V_OL

Output Low Voltage

Note 3

0.925

1.125

–50

V_OCM

∆V_OCM

Output Common Mode Voltage

Change in Common Mode Voltage

Note 4

1.375

Note 1. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.

Note 2. Specification for packaged product only.

Note 3. Measured as per Figure 2a, 100ý across Q and /Q outputs.

Note 4. Measured as per Figure 2b.

(Notes 1, 2)

LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS

V_CC= 2.5V ±5%; T_A= –40°C to +85°C; Unless otherwise stated.

Symbol

V_IH

Parameter

Condition

Min

Typ

Max

Units

Input HIGH Voltage

Input LOW Voltage

Input HIGH Current

Input LOW Current

2.0

V_IL

0.8

I_IH

–125

µA

I_IL

–300

Note 1. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.

Note 2. Specification for packaged product only.

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

(Notes 1, 2)

AC ELECTRICAL CHARACTERISTICS

V_CC= 2.5V ±5%; T_A= –40°C to +85°C; Unless otherwise stated.

Symbol

f_MAX

Parameter

Condition

Min

2.0

Typ

2.5

690

Max

Units

GHz

Maximum Input Frequency

Output Swing ž 200mV

Input Swing < 400mV

Input Swing ž 400mV

Note 3

t_PD

Differential Propagation Delay

IN to Q

590

540

870

820

t_SKEW

Within-Device Skew (diff.)

Part-to-Part Skew (diff.)

Reset Recovery Time

Cycle-to-Cycle Jitter

Total Jitter

Note 3

280

t_RR

Note 4

600

t_JITTER

Note 5

ps_RMS

ps_PP

Note 6

t_r,t_f

Rise/Fall Time (20% to 80%)

120

200

Note 1. Measured with 400mV input signal, 50% duty cycle, all outputs loaded with 100ý across each output pair, unless otherwise stated.

Note 2. Specification for packaged product only.

Note 3. Skew is measured between outputs under identical transitions.

Note 4. See “Timing Diagram.”

Note 5. Cycle-to-cycle jitter definition: the variation in period between adjacent cycles over a random sample of adjacent cycle pairs. T

= T –T

n+1

jitter_cc

where T is the time between rising edges of the output signal.

Note 6. Total jitter definition: with an ideal clock input of frequency - f

, no more than one output edge in 10 output edges will deviate by more than

MAX

the specified peak-to-peak jitter value.

TIMING DIAGRAM

/RESET

V_CC/2

t_RR

V_ID

/IN

V_INSwing

t_PD

_OUTSwing

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

TYPICAL OPERATING CHARACTERISTICS

= 2.5V, T = 25°C, unless otherwise stated.

Output Amplitude

vs. Frequency

IN to Q Propagation Delay

vs. Input Swing

350

800

750

700

650

600

550

500

300

250

200

150

100

500 1000 1500 2000 2500 3000 3500

FREQUENCY (MHz)

200 400 600 800 1000

INPUT SWING (mV)

IN to Q Propagation Delay

vs. Temperature

Output Duty Cycle

vs. Frequency

800

750

700

650

600

550

500

500 1000 1500 2000 2500 3000

-60 -40 -20

20 40 60 80 100

FREQUENCY (MHz)

TEMPERATURE (°C)

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

TYPICAL OPERATING CHARACTERISTICS (Continued)

= 2.5V, T = 25°C, unless otherwise stated.

622MHz Output

1.25GHz Output

TIME (300ps/div.)

TIME (140ps/div.)

2.5GHz Output

TIME (80ps/div.)

DEFINITION OF SINGLE-ENDED AND DIFFERENTIAL SWINGS

V_{DIFF_IN}, V_{DIFF_OUT}

700mV (typical)

V_IN,V_OUT

350mV

(typical)

Figure 1b. Differential Swing

Figure 1a. Single-Ended Swing

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

INPUT INTERFACE APPLICATIONS

V_CC

1.86k

25kΩ

/RESET

V_T

50Ω

GND

/IN

Figure 2b. Simplified TTL/CMOS Input Buffer

Figure 2a. Simplified Differential Input Buffer

LVDS OUTPUTS

LVDS (Low Voltage Differential Swing) specifies a small to permit large variations in ground between an LVDS driver

swing of 350mV typical, on a nominal 1.25V common mode and receiver. Also, change in common mode voltage, as a

above ground. The common mode voltage has tight limits function of data input, is also kept tight, to keep EMI low.

50Ω

v_OD

100Ω

v_OH, v_OL

v_OCM

v_OH, v_OL

50Ω

∆v_OCM

GND

Figure 3a. LVDS Differential Measurement

Figure 3b. LVDS Common Mode Measurement

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

INPUT INTERFACE APPLICATIONS

V_CC

PECL

GND

/IN

CML

SY89875U

/IN

SY89875U

V_CC–2V

V_T

0.01µF

GND

V_T

39Ω

V_{REF_AC}

V_CC

Figure 4c. DC-Coupled PECL

Input Interface

Figure 4a. DC-Coupled CML

Input Interface

Figure 4b. AC-Coupled CML

Input Interface

Figure 4d. AC-Coupled CML

Input Interface

Figure 4f. HSTL

Input Interface

Figure 4e. LVDS

Input Interface

RELATED PRODUCT AND SUPPORT DOCUMENTATION

Part Number

Function

Data Sheet Link

SY89872U

2.5V, 2.5GHz Any Diff. In-to-LVDS

Programmable Clock Divider/Fanout Buffer

w/ Internal Termination

http://www.micrel.com/product-info/products/sy89872u.shtml

MLF^®Application Note

http://www.amkor.com/products/notes_papers/mlf_appnote_0902.pdf

http://www.micrel.com/product-info/products/solutions.shtml

HBW Solutions New Products and Applications

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

Precision Edge^®

SY89875U

Micrel, Inc.

16-PIN MicroLeadFrame (MLF-16)

Package

EP- Exposed Pad

Die

CompSide Island

Heat Dissipation

V_EE

Heavy Copper Plane

V_EE

PCB Thermal Consideration for 16-Pin MLF Package

(Always solder, or equivalent, the exposed pad to the PCB)

Package Notes:

Note 1. Package meets Level 2 moisture sensitivity classification, and are shipped in dry-pack form.

Note 2. Exposed pads must be soldered to a ground for proper thermal management.

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com

The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into

the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s

use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify

Micrel for any damages resulting from such use or sale.

M9999-082407

hbwhelp@micrel.com or (408) 955-1690

SY89875UMI [MICROCHIP]

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