Integrated programmable clock divider fanout buffer Guaranteed perform
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2.5GHz DIFF. IN-TO-LVPECL Precision EdgeSY89874U PROGRAMMABLE CLOCK DIVIDER/FANOUT FINAL BUFFER WITH INTERNAL TERMINATION
Integrated programmable clock divider fanout buffer Guaranteed performance over temperature voltage: 2.5GHz fMAX 250ps tr/tf 15ps within device skew jitter design: 10ps (pk-pk) total jitter (rms) cycle-to-cycle jitter Unique input termination DC-coupled AC-coupled Inputs; CML, PECL, LVDS HSTL TTL/CMOS inputs select reset 100k compatible LVPECL outputs Parallel programming capability Programmable divider ratios voltage operation 2.5V 3.3V Output disable function -40°C 85°C temperature range Available 16-pin (3mm 3mm) MLFpackage Precision Edge
This low-skew, low-jitter device capable accepting high-speed (e.g., 622MHz higher) CML, LVPECL, LVDS HSTL clock input signal dividing down frequency using programmable divider ratio create frequencylocked, lower speed version input clock. Available divider ratios straight pass-through. typical 622MHz clock system this would provide availability 311MHz, 155MHz, 77MHz 38MHz auxiliary clock components. differential input buffer unique internal termination design that allows access termination network through pin. This feature allows device easily interface different logic standards. VREF-AC reference included AC-coupled applications. /RESET input asynchronously resets divider. pass-through function (divide /RESET synchronously enables disables outputs next falling edge (rising edge /N).
APPLICATIONS
SONET/SDH line cards Transponders High-end, multiprocessor sensors
TYPICAL PERFORMANCE
OC-12 OC-3 Translator/Divider
FUNCTIONAL BLOCK DIAGRAM
LVDS 622MHz Clock
Divide-by-4
LVPECL 155.5MHz Clock
/RESET Enable Enable
622MHz
Decoder Divided
155.5MHz
VREF-AC
Precision Edge trademark Micrel, Inc. MicroLeadFrame trademarks Amkor Technology, Inc.
Rev.:
Amendment:
Issue Date: February 2003
Micrel
Precision EdgeSY89874U
PACKAGE/ORDERING INFORMATION
Ordering Information
VREF-AC
Part Number SY89874UMI SY89874UMITR*
*Tape Reel
Package Type MLF-16 MLF-16
Operating Range Industrial Industrial
Package Marking 874U 874U
16-Pin MLF(MLF-16)
Number Name /RESET /DISABLE Function Differential Input: Internal termination resistors input. Flexible input accepts differential input. "Input Interface Applications" section. Differential Buffered LVPECL Outputs: Divided "Truth Table." Unused PECL outputs left floating with impact jitter performance. Select Pins: "Truth Table." LVTTL/CMOS logic levels. Internal pull-up resistor. Logic HIGH left unconnected (divided mode.) Input threshold VCC/2. Connect. LVTTL/CMOS Logic Levels: Internal pull-up resistor. Logic HIGH left unconnected. Apply reset divider (divided mode). Also acts synchronous disable/enable function. reset disable function occurs next high-to-low clock input transition. Input threshold VCC/2. Reference Voltage: Equal VCC-1.4V (approx.). Used AC-coupled applications only. Decouple VREF-AC with 0.01µF capacitor. "Input Interface Applications" section. Termination Center-Tap: LVDS inputs, leave this floating. Otherwise, Figures "Input Interface Applications" section. Positive Power Supply: Bypass with 0.1µF//0.01µF capacitor. Ground.
VREF-AC
TRUTH TABLE
/RESET(1) 0(1)
Note
Reset/Disable function asserted next clock input (IN, /IN) high-to-low transition.
/RESET
Outputs Reference Clock (pass through) Reference Clock Reference Clock Reference Clock Reference Clock LOW, HIGH Clock Disable
Micrel
Precision EdgeSY89874U
Absolute Maximum Ratings(Note
Supply Voltage (VCC) -0.5V +4.0V Input Voltage (VIN) -0.5V VCC+0.3 Output Current (IOUT) Continuous 50mA Surge 100mA Input Current (IIN) ±50mA Current (IVT) ±100mA VREF-AC Sink/Source Current (IVREF-AC), Note ±2mA Lead Temperature (soldering sec.) 220°C Storage Temperature (TS) -65°C +150°C
Note
Operating Ratings(Note
Supply Voltage (VCC) .+3.3V ±10% +2.5V Ambient Temperature (TA) -40°C +85°C Package Thermal Resistance MLF(JA) Still-Air 60°C/W 500lfpm 54°C/W MLF(JB), Note Junction-to-Board 32°C/W
Note Note Note
Permanent device damage occur ABSOLUTE MAXIMUM RATINGS exceeded. This stress rating only functional operation implied conditions other than those detailed operational sections this data sheet. Exposure ABSOLUTE MAXIMUM RATlNG conditions extended periods affect device reliability. data sheet limits guaranteed device operated beyond operating ratings. limited drive capability input same package only. Junction-to-board resistance assumes exposed soldered equivalent) device's most negative potential PCB.
ELECTRICAL CHARACTERISTICS(Notes
-40°C +85°C; Unless otherwise stated. Symbol VDIFF_IN |IIN| VREF-AC
Note Note Note Note Note Note
Parameter Power Supply Power Supply Current Differential Input Resistance (IN, /IN) Input High Voltage (IN, /IN) Input Voltage (IN, /IN) Input Voltage Swing Differential Input Voltage Swing Input Current (IN, /IN) Reference Voltage
Condition
2.375
3.63
Units
load, max. Note Note Notes Notes Note Note -0.3
VCC+0.3 VCC+0.2
VCC-1.525 VCC-1.425 VCC-1.325
circuit designed meet specifications shown above table after thermal equilibrium been established. Specification packaged product only. internal termination (see "Input Structures" input current depends applied voltages inputs. apply combination voltages that causes input current exceed maximum limit! "Timing Diagram" definition. (Max) specified when floating. "Typical Operating Characteristics" section VDIFF definition. Operating using limited AC-coupled PECL applications only. Connect directly pin.
(100KEP) LVPECL ELECTRICAL CHARACTERISTICS(Notes
3.3V ±10% 2.5V ±5%; -40°C +85°C, -2V; Unless otherwise stated. Symbol VOUT VDIFF_OUT
Note Note
Parameter Output High Voltage Output Voltage Output Voltage Swing Differential Output Voltage Swing
Condition
Units
VCC-1.145 VCC-1.020 VCC-0.895 VCC-1.945 VCC-1.820 VCC-1.695 1.10 1.60 1050 2.10
circuit designed meet specifications shown above table after thermal equilibrium been established. Specification packaged product only.
Micrel
Precision EdgeSY89874U
LVTTL/CMOS ELECTRICAL CHARACTERISTICS(Notes
3.3V ±10% 2.5V ±5%; -40°C +85°C; Unless otherwise stated. Symbol
Note Note
Parameter Input HIGH Voltage Input Voltage Input HIGH Current Input Current
Condition
Units
-125 -300
circuit designed meet specifications shown above table after thermal equilibrium been established. Specification packaged product only.
Micrel
Precision EdgeSY89874U
ELECTRICAL CHARACTERISTICS(Notes
3.3V ±10% 2.5V ±5%; -40°C +85°C; Unless otherwise stated. Symbol fMAX tPLH tPHL tSKEW Parameter Maximum Output Toggle Frequency Maximum Input Frequency Differential Propagation Delay Within-Device Skew (diff.) Q0-Q1 Part-to-Part Skew (diff.) Tjitter tr,tf
Note Note Note Note Note Note
Condition Output Swing 400mV Divide Input Swing 400mV Input Swing 400mV Note Note Note Note Note
Units
Reset Recovery Time Cycle-to-Cycle Jitter Total Jitter Rise/Fall Time (20% 80%)
ps(rms) ps(pk-pk)
Measured with 400mV input signal, duty cycle, outputs loaded with VCC-2V, unless otherwise stated. Specification packaged product only. Skew measured between outputs under identical transitions. "Timing Diagram." Cycle-to-cycle jitter definition: variation period between adjacent cycles over random sample adjacent cycle pairs. Tjitter_cc=Tn-Tn+1, where time between rising edges output signal. Total jitter definition: with ideal clock input, frequency fMAX (device), more than output edge 1012 output edges will deviate more than specified peak-to-peak jitter value.
TIMING DIAGRAM
/RESET
VCC/2
Swing VOUT Swing
Micrel
Precision EdgeSY89874U
TYPICAL OPERATING CHARACTERISTICS
3.3V, 400mV, 25°C, unless otherwise stated.
Output Amplitude Frequency
PROPAGATION DELAY (ps) AMPLITUDE (mV) 1000 1500 2000 2500 3000 3500
Propagation Delay Input Swing
PROPAGATION DELAY (ps)
Propagation Delay Temperature
1000 1200 INPUT SWING (mV)
TEMPERATURE (°C)
FREQUENCY (MHz)
622MHz Output
1.25GHz Output
Output Swing (100mV/div.)
Output Swing (100mV/div.)
TIME (200ps/div.)
TIME (200ps/div.)
2.5GHz Output
Output Swing (100mV/div.)
TIME (100ps/div.)
Micrel
Precision EdgeSY89874U
DEFINITION SINGLE-ENDED DIFFERENTIAL SWING
VIN, VOUT 800mV (typical)
VDIFF_IN, VDIFF_OUT 1600mV (typical)
Figure Single-Ended Swing
Figure Differential Swing
INPUT BUFFER STRUCTURE
1.86k
1.86k
/RESET
1.86k
1.86k
Figure Simplified Differential Input Buffer
Figure Simplified TTL/CMOS Input Buffer
Micrel
Precision EdgeSY89874U
INPUT INTERFACE APPLICATIONS
SY89874U VREF-AC 0.01µF
PECL
SY89874U
SY89874U VREF-AC
.01µF VCC-2V*
VREF-AC
Bypass with 0.01µF
Figure DC-Coupled Input Interface
Figure AC-Coupled Input Interface
Figure DC-Coupled PECL Input Interface
PECL Rpd* Rpd* 0.01µF VREF-AC SY89874U
LVDS SY89874U
HSTL SY89874U VREF-AC
VREF-AC
*Note. 3.3V 2.5V
Figure AC-Coupled PECL Input Interface
Figure LVDS Input Interface
Figure HSTL Input Interface
RELATED PRODUCT SUPPORT DOCUMENTATION
Part Number SY89871U Function 2.5GHz Diff. In-to-LVPECL Programmable Clock Divider/Fanout Buffer w/Internal Termination MLFApplication Note Solutions Products Applications Data Sheet Link
Micrel
Precision EdgeSY89874U
LVPECL OUTPUT TERMINATION RECOMMENDATIONS
+3.3V
+3.3V
+3.3V
Figure Parallel Termination-Thevenin Equivalent
Note +2.5V systems: 250, 62.5
+3.3V
+3.3V
"source"
"destination" (Optional) 0.01µF
Figure Three-Resistor "Y-Termination"
Note Note Note Note Power-saving alternative Thevenin termination. Place termination resistors close destination inputs possible. resistor sets bias voltage, equal +3.3V systems +2.5V systems optional bypass capacitor intended compensate tr/tf mismatches.
+3.3V
+3.3V -1.3V +3.3V
+3.3V
1.6k
Figure Terminating Unused
Note Note Unused output (/Q) must terminated balance output. +2.5V systems: 250, 62.5, 1.25k, 1.2k.
Micrel
Precision EdgeSY89874U
LEAD MicroLeadFrame(MLF-16)
0.42 +0.18 -0.18 0.23 +0.07 -0.05 0.01 +0.04 -0.01 0.65 +0.15 -0.65 0.20 REF. 0.42
+0.18 -0.18
0.85 +0.15 -0.65 3.00BSC 2.75BSC
1.60 +0.10 -0.10
0.50
2.75BSC 3.00BSC
1.60 +0.10 -0.10
SEATING PLANE VIEW 0.23 +0.07 -0.05 0.01 +0.04 -0.01
0.42 +0.18 -0.18
BOTTOM VIEW
0.40 +0.05 -0.05
0.5BSC EVEN TERMINAL/SIDE
SECTION "C-C" SCALE: NONE
DIMENSIONS THICKNESS ALLOWABLE 0.305mm MAX. PACKAGE WARPAGE 0.05mm. THIS DIMENSION APPLIES PLATED TERMINAL MEASURED BETWEEN 0.20mm 0.25mm FROM TIP. APPLIES ONLY TERMINALS
Rev.
Package Exposed
CompSide Island
Heat Dissipation Heat Dissipation Heavy Copper Plane Heavy Copper Plane
Thermal Consideration 16-Pin MLFPackage (Always solder, equivalent, exposed PCB) Package Notes: Note Package meets Level moisture sensitivity classification, shipped dry-pack form. Note Exposed pads must soldered ground proper thermal management.
MICREL, INC.
1849 FORTUNE DRIVE JOSE, 95131
(408) 944-0800
(408) 944-0970
http://www.micrel.com
information furnished Micrel this datasheet believed accurate reliable. However, responsibility assumed Micrel use. Micrel reserves right change circuitry specifications time without notification customer. Micrel Products designed authorized components life support appliances, devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user. Purchaser's sale Micrel Products life support appliances, devices systems Purchaser's risk Purchaser agrees fully indemnify Micrel damages resulting from such sale. 2003 Micrel, Incorporated.
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