SY89425 データシートの表示（PDF） - Micrel

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SY89425

DUAL SONET OC-12 CLOCK SYNTHESIZER

Micrel 

Micrel

ClockWorks™

SY89425

PIN DESCRIPTION

INPUTS

RFCKB [Reference Clock B] TTL

Reference clock in for PLL B. (38.88, 51.84 or 77.76MHz).

SEL39B [38.88MHz Select B] TTL

Logic HIGH on this pin denotes a 38.88MHz input reference

clock for PLL B. Tie to logic LOW if input is not 38.88MHz.

SEL78B [77.76MHz Select B] TTL

Logic HIGH on this pin denotes a 77.76MHz input reference

clock for PLL A. Tie to logic LOW if input is not 77.76MHz.

REFCKA [Reference Clock A] TTL

Reference clock in for PLL A.

FLTRAP, FLTRAN (Loop Filter A, Pos & Neg) Analog.

Connect a series RC loop filter between these pins. The

suggested loop filter is 0.1µF and 500 ohms, as shown in the

typical application on page 5-527.

OUTPUTS

CK622BP, CK622BN (Clock Out B) Differential PECL

622.08MHz output clock from PLL B.

RSTB [Reset B] TTL

Tie to logic LOW for normal operation; logic HIGH forces reset

of internal Phase Detector & feedback dividers on PLL B.

FLTRBP, FLTRBN (Loop Filter B, Pos & Neg) Analog.

Connect a series RC loop filter between these pins. The

suggested loop filter is 0.1µF and 500 ohms, as shown in the

typical application on page 3-9.

RSTA (Reset A) TTL

Tie to logic LOW for normal operation; logic HIGH forces reset

of internal Phase Detector & feedback dividers on PLL A.

CK622AP, CK622AN (Clock Out A) Differential PECL

622.08MHz output clock from PLL A.

POWER & GROUND

VCCA

VCCB

VCCOA

VCCOB

GND

+5V for PLL A.

+5V for PLL B.

+5V for PLL A PECL outputs.

+5V for PLL B PECL outputs.

Ground (0 volts)

SEL78A [77.76MHz Select A] TTL

Logic HIGH on this pin denotes a 77.76MHz input reference

clock for PLL A. Tie to logic LOW if input is not 77.76MHz.

SEL39A [38.88MHz Select A] TTL

Logic HIGH on this pin denotes a 38.88MHz input reference

clock for PLL A. Tie to logic LOW if input is not 38.88MHz.

REFERENCE FREQUENCY SELECTION

SEL39

0

0

1

1

SEL78

0

1

0

1

fRFCK

51.84

77.76

38.88

77.76

ABSOLUTE MAXIMUM RATINGS(1)

Symbol

Parameter

Rating

Unit

VCC

Power Supply

0 to +7

V

VI

IOUT

TA

Tstore

Input Voltage

Output Current

–Continuous

–Surge

Operatimg Temperature Range

Storage Temperature Range

0 to VCC

V

50

mA

100

0 to +85

°C

–65 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 RATING conditions

for extended periods may affect device reliability.

3

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