SY89421V datasheet, PDF - EEWORLD Datasheet

5V/3.3V

HIGH-PERFORMANCE

PHASE LOCKED LOOP

FEATURES

s

3.3V and 5V power supply options

s

1.12GHz maximum VCO frequency

s

30MHz to 560MHz reference input operating

frequency

s

External 2.0GHz VCO capability

s

Low jitter differential design

s

Frequency doubler mode

s

PECL Differential output

s

External loop filter optimizes performance/cost

s

Available in 20-pin SOIC package

ClockWorks™

SY89421V

FINAL

DESCRIPTION

The SY89421V is a digital Phase Locked Loop based on

Micrel-Synergy's differential PLL technology. It is capable

of operating in the 30MHz to 560MHz reference input

frequency range, and up to 2000MHz with the HFIN input

and an external VCO. Use of a phase-frequency detector

results in excellent PLL locking and tracking characteristics.

Error correction voltages are generated by the detector if

either phase or frequency deviations occur. The VCO has

a frequency range covering more than a 2:1 ratio from

480MHz to 1120MHz.

Feedback for the loop is realized by connecting FOUT,

FOUT to FIN, FIN by means of external circuitry. This

allows the flexibility of inserting additional circuitry off-chip

in the feedback paths, such as an additional divider and/or

buffer. Pulldown resistors are required for the FOUT and

FOUT pins. High frequency inputs HFIN, HFIN and

corresponding outputs HFOUT, HFOUT are featured for

use with external components such as an active loop filter

and a high frequency VCO.

Select pins S1 and S2 are used to program the N divider

for optimum VCO operation, in other words with the VCO in

the center of its range. Select pin S3 allows bypassing the

N divider enabling the PLL to output the VCO directly.

Select pin S4 is used to select off-chip or on-chip VCO.

Select pin S5 enables the divide-by-two prescaler, which is

useful in frequency doubling applications. All Select pins

are TTL compatible.

APPLICATIONS

s

Workstations

s

Advanced communications

s

High-performance computing

PIN CONFIGURATION

S1

FIN

V

EE

F1

F2

S5

HFIN

1

2

3

4

5

6

7

8

9

20

19

18

17

S2

RIN

S3

V

CC

FOUT

V

CCO

HFOUT

TOP VIEW

SOIC

Z20-1

16

15

14

13

12

11

S4 10

Rev.: F

Amendment: /0

1

Issue Date: May 2000

Micrel

ClockWorks™

SY89421V

BLOCK DIAGRAM

F1

F2

HFIN

÷2

RIN

D

LOOP

FILTER

RIN

PHASE-FREQUENCY

DETECTOR

VCO

FIN

÷P

(1, 2)

S4

0

MUX

1

S5

HFOUT

÷N

(1,2,4,8,10,12,16,20)

S1

S2

S3

FOUT

LOOP FILTER COMPONENT SELECTION

R

C

F1

F2

C

R

= 1.0µF

±10%

(X7R dielectric)

= 560Ω

±10%

2

Micrel

ClockWorks™

SY89421V

PIN NAMES

F1

F2

RIN

FIN

HFIN

HFOUT

FOUT

V

CC

V

CCO

V

EE

S1

S2

S3

S4

S5

Filter Pin 1

Filter Pin 2

Reference Input

Inverted Reference Input

Feedback Input

Inverted Feeback Input

High Frequency Input

Inverted High Frequency Input

High Frequency Output

Inverted High Frequency Output

Frequency Output

Inverted Frequency Output

V

CC

Output V

CC

V

EE

(0V)

Select Input 1 (TTL)

Select Input 2 (TTL)

Select Input 3 (TTL)

Select Input 4 (TTL)

Select Input 5 (TTL)

Function

I/O

I

O

—

I

PIN DESCRIPTION

RIN, RIN

Reference frequency inputs. These are differential signal

pairs and may be driven differentially or single-ended.

FIN, FIN

Feedback frequency inputs. These are a differential signal

pair and may be driven differentially or single-ended.

HFIN, HFIN

High frequency feedback inputs. These are a differential

signal pair. Differential drive is recommended.

F1, F2

These pins are connection points for the loop filter, which is to

be provided off-chip. F1 is the high impedance side, F2 is the

reference side. The loop filter should be a first order, low pass

with a DC block. The difference voltage on these pins will be

a dc level, which is controlled by the loop feedback and

determined by the required VCO frequency.

FOUT, FOUT

Frequency outputs for the loops. These are differential, positive

referenced, emitter-follower signals and must be terminated

off chip. Termination in 50 ohms is recommended.

HFOUT, HFOUT

High frequency output. These are a differential signal pair.

Termination in 50 ohms is recommended.

S1, S2, S3, S4, S5

These are the frequency select inputs, and are used to

configure the PLL. They are compatible with standard TTL

signal levels. See the Frequency Selection Table for details

of the logic.

V

CC

This is the positive supply for the chip. It should be decoupled

and should present a very low impedance in order to assure

low-jitter operation.

V

CCO

This is the positive supply for the output buffer. It is constrained

to be equal to or less than the value of V

CC

. It should be

decoupled and should present a very low impedance for low-

jitter.

V

EE

This pin is the negative supply for the chip and is normally

connected to ground (0V).

3

Micrel

ClockWorks™

SY89421V

FREQUENCY SELECTION TABLE

FOUT

Freq. Range MHz

240 – 560

120 – 280

60 – 140

30 – 70

480 – 1120

48 – 112

40 – 93.3

20 – 56

HFIN divide by 4

HFIN divide by 8

HFIN divide by 16

HFIN divide by 32

HFIN divide by 2

HFIN divide by 20

HFIN divide by 24

HFIN divide by 40

HFOUT

Freq. Range MHz

480 – 1120

HFIN divide by 2

S4

0

1

S3

0

1

0

1

S2

0

1

0

1

0

1

0

1

S1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

N

2

4

8

16

1

10

12

20

2

4

8

16

1

10

12

20

S5

0

1

Divide-by-P

P= 1

P= 2

Maximum Feedback

Frequency (MHz)

560

1120

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol

V

CC

V

I

OUT

Parameter

Power Supply Voltage

TTL Input Voltage

(2)

TTL Input Current

(2)

ECL Output Current

— Continuous

— Surge

Storage Temperature

Operating Temperature Range

(3)

Value

–0.5 to +7.0

–0.5 to 6.0

–30 to +5.0

50

100

–65 to +150

0 to +85

°C

Unit

V

mA

T

store

T

A

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.

3. All DC and AC electrical characteristics are specified over the operating termperature range.

4

Micrel

ClockWorks™

SY89421V

5V DC ELECTRICAL CHARACTERISTICS

V

CC

= V

CCO

= 5.0V

±5%

Symbol

V

CC

I

CC

I

CCO

Parameter

Power Supply Voltage

Power Supply Current (V

CC

)

Power Supply Current (V

CCO

)

Min.

4.75

—

Typ.

—

Max.

5.25

100

28

Unit

V

mA

PECL outputs are open

Condition

V

CC

= V

CCO

3.3V DC ELECTRICAL CHARACTERISTICS

V

CC

= V

CCO

= 3.3V

±5%

Symbol

V

CC

I

CC

I

CCO

Parameter

Power Supply Voltage

Power Supply Current (V

CC

)

Power Supply Current (V

CCO

)

Min.

3.135

—

Typ.

—

Max.

3.465

100

28

Unit

V

mA

PECL outputs are open

Condition

V

CC

= V

CCO

PECL DC ELECTRICAL CHARACTERISTICS

V

CC

= V

CCO

= 3.3V or 5.0V

±5%

Symbol

V

OH

V

OL

V

IH

V

IL

Parameter

Output HIGH Voltage

Output LOW Voltage

Input HIGH Voltage

Input LOW Voltage

Min.

V

CC

– 1.025

V

CC

– 1.810

V

CC

– 1.165

V

CC

– 1.810

Typ.

—

Max.

V

CC

– 0.780

V

CC

– 1.520

V

CC

– 0.780

V

CC

– 1.475

Unit

V

Condition

TTL DC ELECTRICAL CHARACTERISTICS

V

CC

= V

CCO

= 3.3V or 5.0V

±5%

Symbol

V

IH

V

IL

I

IH

I

IL

V

IK

Parameter

Input HIGH Voltage

Input LOW Voltage

Input HIGH Current

Input LOW Current

Input Clamp Voltage

Min.

2.0

—

Typ.

—

Max.

—

0.8

20

100

–0.3

– 1.2

Unit

V

µA

mA

V

IN

= 2.7V

V

IN

= V

CC

V

IN

= 0.5V

I

IN

= –12mA

Condition

5

SY89421V

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