sy89426 Micrel Semiconductor, sy89426 Datasheet

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sy89426

Manufacturer Part Number
sy89426
Description
Sy89426 Sonet Oc-12/oc-3 Clock Synthesizer
Manufacturer
Micrel Semiconductor
Datasheet

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CLOCK
TYPICAL APPLICATION
FEATURES
Single chip source for 622.08MHz and 155.52MHz
clocks
622.08MHz output is differential PECL, 155.52MHz
output is single-ended PECL
TTL/CMOS compatible inputs and reference output
SONET compliant jitter performance ( 0.01UI)
Choice of three reference frequencies
Only 395mW (typ)
Complies with Bellcore, CCITT and ANSI standards
Single +5 volt power supply
Fully compatible with industry standard 10KH I/O
levels
Available in 28-pin PLCC package
0.1uF
IN
1000
FLTRN
RFCK
(TTL)
FLTRP
SEL39
(TTL)
SEL78
(TTL)
+5V
VCC
GND
SY89426
(TTL)
RST
VCCO
+5V
RETRFCK
CK622N
CK622P
(PECL)
(PECL)
CK155
DISC
(TTL)
(TTL)
+3V
+3V
50
2X 50
SONET OC-12/OC-3
CLOCK SYNTHESIZER
622.08MHz
CLOCK OUT
155.52MHz
CLOCK OUT
RETIMED
REFOUT
1
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.
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.
PIN CONFIGURATION
DESCRIPTION
Micrel-Synergy's SY89426 Multi-Output Phase Locked
Coupling Micrel-Synergy's advanced PLL technology
SEL39
SEL78
RFCK
GND
GND
V
NC
CC
26
27
28
1
2
3
4
25 24 23 22 21 20 19
5
6
TOP VIEW
7
PLCC
J28-1
8
9
10 11
18
17
16
15
14
13
12
ClockWorks™
Rev.: F
Issue Date: July, 1999
V
V
V
CK155
GND
CK622P
CK622N
CC
CC
CCO
SY89426
Amendment: /0
FINAL

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sy89426 Summary of contents

Page 1

... 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-Synergy's advanced PLL technology with our proprietary ASSET™ bipolar process has produced ...

Page 2

... POWER & GROUND V +5V for internal circuits +5V for PECL outputs. CCO GND Ground (0 volts CCO RST (TTL) VCO CK622P (PECL) CK622N CK155 (PECL) RETRFCK (TTL) DISC (TTL) ClockWorks™ SY89426 ...

Page 3

... -1480 -1950 -1480 -1950 0.5 — 0.3 Unit Condition –2mA 4mA OUT V — V — ClockWorks™ SY89426 Unit Max. Unit V mV -670 -1545 -720 -1445 CC — A ...

Page 4

... Unit Condition 120 mA — Vcc -2, 50% duty cycle Units Condition MHz Nominal ppm 77.76MHz ppm 51.84MHz ppm 38.88MHz % 15pF load sec ns 10% to 90% of amplitude, 15pF load ps 10% to 90%, 50 load, 5pF cap % sec ClockWorks™ SY89426 ...

Page 5

... The low-pass cutoff frequency of the measurement filter shall be higher than 5MHz. The characteristic of the measurement filter is shown below. 12kHz Frequency Figure 1 Operating Range Commercial Commercial Industrial Industrial 5 ClockWorks™ SY89426 5MHz (minimum) ...

Page 6

... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc (408) 914-7878 http://www.micrel.com FAX WEB © 2000 Micrel Incorporated 6 ClockWorks™ SY89426 Rev. 03 ...

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