MAX3270 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 155Mbps/622Mbps Clock Recovery and Data Retiming IC with Fully Integrated Phase/Frequency Detector

19-0379; Rev 0; 3/95
155Mbps/622Mbps Clock Recovery and
Data Retiming IC with Fully Integrated
Phase/Frequency Detector
_______________General Description
The MAX3270 is a complete Clock Recovery and Data
Retiming IC for 155Mbps and 622Mbps SDH/SONET
and ATM applications. The MAX3270 meets Bellcore
and CCITT jitter tolerance specifications ensuring error-
free data recovery. Recovered clock and data are
phase aligned using a fully integrated phase-locked
loop (PLL). An output frequency monitor (FM) is includ-
ed to detect loss of PLL acquisition or a loss of input
data.
The MAX3270 has differential ECL input and output
interfaces, so it is less susceptible to noise in a high-
frequency environment. The fully integrated PLL
includes an integrated phase-frequency detector that
eliminates the need for external references.
________________________Applications
155Mbps (STM-1/OC-3)/622Mbps (STM-4/
OC-12) SDH/SONET Transmission Systems
155Mbps/622Mbps ATM/SONET Access Nodes
Add/Drop Multiplexers
Cross-Connects
____________________________Features
o Supports Both 155Mbps and 622Mbps Clock
Recovery and Data Retiming
o Fully Integrated Phase/Frequency Detector
o Capable of Switching to an External Clock
o Differential 100K ECL Data and Clock I/Os
o Output Monitor Provides Lock Detection
o No External Reference Clock Required
______________Ordering Information
PART
MAX3270EMH
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
44 MQFP
Pin Configuration appears at end of data sheet.
___________________________________________________Typical Operating Circuit
-2V
+5V
11 39 17 19 38
7 16 15 5 24 27 29 32
50Ω 50Ω 50Ω 50Ω
3 _SDIP
50Ω
-2V
50Ω
-2V
+5V
4
41
SDIN
PHADJ
42 _VR
13 _EXCS
18 _CRS
20 _RST
14 _EXC
MAX3270
RDOP ²⁶
RDON ²⁵
31
RCOP
30
RCON
CRP ²⁸
FILP ⁹
FILG ⁸
2.2µF
20Ω
FILN ¹⁰
FM ⁶
2.2µF
20Ω
-4.5V
450Ω
50Ω
2
12
1
35 36 22 21 34
-2V
EXCS AND CRS ARE CONNECTED FOR
622Mbps OPERATION.
-4.5V -4.5V -4.5V
ANALOG SUPPLY
-4.5V
DIGITAL
SUPPLY
BYPASS SUPPLIES WITH 0.1µF AND 0.01µF CAPACITORS.
DECOUPLE AVEE1, AVEE2, AND GVEE SUPPLY PINS.
________________________________________________________________ Maxim Integrated Products 1
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