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PDF SY87700L Data sheet ( Hoja de datos )
| Número de pieza | SY87700L | |
| Descripción | 3.3V 32-175Mbps AnyRate CLOCK AND DATA RECOVERY | |
| Fabricantes | Micrel Semiconductor | |
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3.3V 32-175Mbps AnyRate™
CLOCK AND DATA RECOVERY
SY87700L
FEATURES
s Industrial temperature range (–40°C to +85°C)
s 3.3V power supply
s SONET/SDH/ATM compatible
s Clock and data recovery from 32Mbps up to
175Mbps NRZ data stream
s Two on-chip PLLs: one for clock generation and
another for clock recovery
s Selectable reference frequencies
s Differential PECL high-speed serial I/O
s Line receiver input: no external buffering needed
s Link Fault indication
s 100K ECL compatible I/O
s Complies with Bellcore, ITU/CCITT and ANSI
specifications for applications such as OC-1 and
OC-3
s Available in 28-pin SOIC and 32-pin EP-TQFP
packages
DESCRIPTION
The SY87700L is a complete Clock Recovery and Data
Retiming integrated circuit for data rates from 32Mbps
up to 175Mbps NRZ. The device is ideally suited for
SONET/SDH/ATM applications and other high-speed data
transmission systems.
Clock recovery and data retiming is performed by
synchronizing the on-chip VCO directly to the incoming
data stream. The VCO center frequency is controlled by
the reference clock frequency and the selected divide
ratio. On-chip clock generation is performed through the
use of a frequency multiplier PLL with a byte rate source
as reference.
The SY87700L also includes a link fault detection
circuit.
APPLICATIONS
s SONET/SDH/ATM OC-1 and OC-3
s Fast Ethernet
s Proprietary architecture up to 175Mbps
BLOCK DIAGRAM
PLLR P/N
RDINP
(PECL)
RDINN
CD
(PECL)
REFCLK
(TTL)
PHASE
DETECTOR
PHASE/
FREQUENCY
DETECTOR
0
1
CHARGE
PUMP
VCO
PHASE/
FREQUENCY
DETECTOR
CHARGE
PUMP
VCO
LINK
FAULT
DETECTOR
1
0
DIVIDER
BY 8, 10, 16, 20
DIVSEL 1/2
(TTL)
AnyRate™ is a trademark of Micrel, Inc.
SY87700L
PLLS P/N
FREQSEL 1/2/3
(TTL)
1
CLKSEL
(TTL)
RDOUTP
(PECL)
RDOUTN
RCLKP
(PECL)
RCLKN
LFIN
(TTL)
TCLKP
(PECL)
TCLKN
VCC
VCCA
VCCO
GND
Rev.: B Amendment: /0
Issue Date: September 2000
1 page  
Micrel
FREQUENCY SELECTION TABLE
SY87700L
FREQSEL1
FREQSEL2
FREQSEL3
fVCO/fRCLK
fRCLK Data Rates (Mbps)
01
1
6 125 –175
10
0
8 94 – 157
10
1
12 63 – 104
11
0
16 47 – 78
11
1
24 32 – 52
01
0
0 0 X(2)
— undefined
— undefined
NOTES:
1. SY87700L operates from 32-175MHz. For higher speed applications, the SY87701L operates from 32-1250MHz.
2. X is a DON'T CARE.
REFERENCE FREQUENCY SELECTION
ABSOLUTE MAXIMUM RATINGS(1, 2)
DIVSEL1
0
0
1
1
DIVSEL2
0
1
0
1
fRCLK/fREFCLK
8
10
16
20
LOOP FILTER COMPONENTS(1)
R5 C3
PLLSP
PLLSN
Symbol
Rating
Value
Unit
VCC Power Supply
–0.5 to +7.0 V
VI Input Voltage
–0.5 to VCC V
IOUT
Output Current
–Continuous
–Surge
50
100
mA
Tstore
Storage Temperature
–65 to +150 °C
TA
Operating Temperature
–40 to +85 °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. Airflow of 500LFPM recommended.
SONET
R5 = 80Ω
C3 = 1.5µF (X7R Dielectric)
Wide Range
R5 = 350Ω
C3 = 0.47µF (X7R Dielectric)
R6 C4
PLLRP
PLLRN
SONET
R6 = 50Ω
C4 = 1.0µF (X7R Dielectric)
Wide Range
R6 = 680Ω
C4 = 0.47µF (X7R Dielectric)
NOTE:
1. Suggested Values. Values may vary for different applications.
5
5 Page 
Micrel
32 LEAD EPAD TQFP (DIE UP) (H32-1)
SY87700L
Rev. 01
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SY87700L.PDF ] | |
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