The SY89424V is a low-power Phase Locked Loop

(PLL) based frequency synthesizer. The device is capable

of generating up to 1GHz clock frequencies with a low-cost

10–25MHz external series-resonant quartz crystal. One

can also use PECL differential clock signals to drive this

device instead of the quartz crystal. Operation of this chip

is controlled by three select pins (S1, S2 and S3). S1

selects the divide ratio of 24 or 50 for the PLL. S2 and S3

select the output frequency. There are two pull-down

resistor pins (PDR1 and PDR2). Each pin has an on-chip

resistor that will control the output driver currents. When

PDR1 and PDR2 pins are open, both outputs are normal

open emitter PECL drivers. When PDR1 and PDR2 pins

are shorted to the outputs, on-chip pull down currents of

25mA (40mA at 5V VCC) are provided. Both output drivers

are capable of driving 20 ohm clock lines. An output enable

(OE) pin is available and it can be HIGH or left open for

normal operation. When OE is LOW, a built-in Disable

Timing Synchronizer will force the FOUT output to LOW at

the completion of the HIGH clock cycle. The FOUT output

remains HIGH during that time.

5V/3.3V

FREQUENCY SYNTHESIZER

(60MHz to 1GHz)

BLOCK DIAGRAM

ClockWorks™

SY89424V

■ 3.3V and 5V power supply options

■ Up to 1GHz clock frequencies

■ Internal quartz reference oscillator driven by quartz

crystal or PECL source

■ Low jitter PLL design

■ On-chip 20 ohm driver

■ Differential outputs with 600mV (min) swing

■ Optional pull-down resistors for AC-coupled outputs

■ Low power consumption

■ External loop filter optimizes performance/cost

■ Available in 16-pin SOIC package

FEATURES DESCRIPTION

FOUT

XTAL1

LOOP

FILTER

S1A

XTAL2

OSC

PHASE

COMP

CHARGE

PUMP

÷ 24, ÷ 50 VCO

S2A

S3A

÷ 1, 2, 3, 4

PDR1 PDR2

F1A

F2A

Rev.: G Amendment: /0

Issue Date: May, 1998

ClockWorks™

SY89424V

Micrel

Input S1 S2 S3 FOUT, FOUT Frequency Range MHz

FOSC

(1)

0 0 0 24X FOSC 240 – 480

0 0 1 12X FOSC 120 – 240

0 1 0 8X FOSC 80 – 160

0 1 1 6X FOSC 60 – 120

1 0 0 50X FOSC 500 – 1000

1 0 1 25X FOSC 250 – 500

1 1 0 16.67X FOSC 167 – 333

1 1 1 12.5X F

OSC 125 – 250

PIN NAMES

Pin Function I/O

XTAL1 Crystal Input 1 (PECL) I/O

XTAL2 Crystal Input 2 (PECL) I/O

F1 Filter Pin 1 —

F2 Filter Pin 2 (Reference) —

VCCQ Positive Power Supply (Charge Pump) —

S1 Select Input 1 (TTL) I

S2 Select Input 2 (TTL) I

S3 Select Input 3 (TTL) I

FOUT Output (PECL) O

FOUT Complement Output (PECL) O

VCC Positive Power Supply (Logic) —

VCCO Positive Power Supply (PECL Outputs) —

OE Output Enable (TTL) I

VEE Negative Power Suppy (0.0V) —

PDR1 Pulldown Resistor (100Ω) —

PDR

2 Pulldown Resistor (100Ω) —

PIN CONFIGURATION

FREQUENCY SELECTION TABLE

NOTE:

1. FOSC = 10MHz to 25MHz.

ABSOLUTE MAXIMUM RATING

(1)

Symbol Parameter Value Unit

VCC Power Supply Voltage –0.5 to +7.0 V

VI TTL Input Voltage

(2)

–0.5 to 6.0 V

II TTL Input Current

(2)

–30 to +5.0 mA

OUT ECL Output Current –Continuous 50 mA

–Surge 100

Tstore Storage Temperature –65 to +150 °C

A Operating Temperature 0 to +75 °C

NOTES:

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 RATING conditions

for extended periods may affect device reliability.

2. Either voltage limit or current limit is sufficient to protect input.

PDR

Top View

Gullwing

116

413

512

XTAL

CCQ

FOUT

PDR

CCO

ClockWorks™

SY89424V

Micrel

Symbol Parameter Min. Typ. Max. Unit Condition

VO Output Voltage Swing 0.55 0.85 1.15 V Peak-to-Peak

VOH Output HIGH Voltage VCC – 1.075 — VCC – 0.800 V FOUT & FOUT loaded with 50Ω to VCC – 2.0V

VOL Output LOW Voltage VCC – 1.860 — VCC – 1.570 V FOUT & FOUT loaded with 50Ω to VCC – 2.0V

VIH Input HIGH Voltage

(1)

VCC – 1.165 — VCC – 0.880 V

IL Input LOW Voltage

(1)

VCC – 1.810 — VCC – 1.475 V

Symbol Parameter Min. Typ. Max. Unit Condition

VCC Power Supply Voltage 4.75 — 5.25 V VCC = VCCQ = VCCO

ICC Power Supply Current (VCC) ——80 mA

ICCQ Power Supply Current (VCCQ) ——10 mA

CCO Power Supply Current (VCCO) ——20 mA PECL outputs FOUT & FOUT are open

Symbol Parameter Min. Typ. Max. Unit Condition

VIH Input HIGH Voltage 2.0 ——V

VIL Input LOW Voltage ——0.8 V

IH Input HIGH Current ——20 µAVIN = 2.7V

100 VIN = VCC

IIL Input LOW Current ——–0.2 mA VIN = 0.5V

IK Input Clamp Voltage ——–1.2 V IIN = –18mA

5V DC ELECTRICAL CHARACTERISTICS

PECL DC ELECTRICAL CHARACTERISTICS

TTL DC ELECTRICAL CHARACTERISTICS

VCC = VCCQ = VCCO = 3.0V to 5.25V

VCC = VCCQ = VCCO = 4.75V to 5.25V

VCC = VCCQ = VCCO = 3.0V to 5.25V

NOTE:

1. Forcing voltage at XTAL1 and XTAL2

Symbol Parameter Min. Typ. Max. Unit Condition

VCC Power Supply Voltage 3.0 — 3.8 V VCC = VCCQ = VCCO

ICC Power Supply Current (VCC) ——68 mA

ICCQ Power Supply Current (VCCQ) —— 9mA

CCO Power Supply Current (VCCO) ——18 mA PECL outputs FOUT & FOUT are open

3.3V DC ELECTRICAL CHARACTERISTICS

VCC = VCCQ = VCCO = 3.0V to 5.25V

Part #	SY89424VZC
Description	IC, PHASE LOCK LOOP, 1GHZ, W16-SOIC, PLL Type:Frequency Sy
Category	IC
Availability	In Stock
Qty	4

Qty	Price
1 - 2	$25.19134
3 +	$19.08435

Manufacturer	Available	Qty
SYNERGY Date Code: 9926	Freelance Stock: 3 Ships Immediately
SYNERGY Date Code: 9926	Freelance Stock: 1 Ships Immediately

SY89424VZC

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