SY89426_05 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – SONET OC-12/OC-3 CLOCK SYNTHESIZER

Micrel, Inc.
SONET OC-12/OC-3
CLOCK SYNTHESIZER
Precision Edge^®
Precision Ed^Sg^Y8e^9®426
SY89426
FEATURES
s Single chip source for 622.08MHz and 155.52MHz
clocks
s 622.08MHz output is differential PECL, 155.52MHz
output is single-ended PECL
s TTL/CMOS compatible inputs and reference output
s SONET compliant jitter performance (≤0.01UI)
s Choice of three reference frequencies
s Only 395mW (typ)
s Complies with Bellcore, CCITT and ANSI standards
s Single +5 volt power supply
s Fully compatible with industry standard 10KH I/O
levels
s Available in 28-pin PLCC package
Precision Edge^®
DESCRIPTION
Micrel's SY89426 Multi-Output Phase Locked Loop (PLL)
is a SONET compliant clock generator providing
622.08MHz, 155.52MHz and retimed reference clock
outputs. The PLL produces low jitter OC-12/STS-12 and
OC-3/STS-3 rate clocks from an input reference clock of
38.88, 51.84, or 77.76MHz. Additionally, the input reference
clock is retimed and provided as a TTL/CMOS compatible
output, which may be disabled to minimize switching noise.
The SY89426 operates from a single +5 volt supply, and
requires only a simple series RC loop filter.
Coupling Micrel's advanced PLL technology with our
proprietary ASSET™ bipolar process has produced a clock
generator IC which exceeds applicable Bellcore and ANSI
specifications, while setting a new standard for performance
and flexibility.
TYPICAL APPLICATION
+5V +5V
+3V
VCC VCCO
CLOCK
IN
0.1uF
RFCK
(TTL)
FLTRN
CK622P
(PECL)
CK622N
1000Ω
FLTRP ^SY89426
SEL39
(TTL)
SEL78
(TTL)
GND
CK155
(PECL)
RETRFCK
(TTL)
RST DISC
(TTL) (TTL)
2X 50Ω
622.08MHz
CLOCK OUT
+3V
50Ω
155.52MHz
CLOCK OUT
RETIMED
REFOUT
Precision Edge is a registered trademark of Micrel, Inc.
ASSET is a trademark of Micrel, Inc.
M9999-112105
[e-mail] or [phone]
1
Rev.: H Amendment: /0
Issue Date: November 2005