19-0379; Rev 0; 3/95
1 5 5 Mb p s /6 2 2 Mb p s Clo c k Re c o ve ry a n d
Da t a Re t im in g IC w it h Fu lly In t e g ra t e d
P h a s e /Fre q u e n c y De t e c t o r
MAX3270
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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-
fre e d a ta re c ove ry. Re c ove re d c loc k a nd d a ta a re
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.
♦ Supports Both 155Mbps and 622Mbps Clock
Recovery and Data Retiming
♦ Fully Integrated Phase/Frequency Detector
♦ Capable of Switching to an External Clock
♦ Differential 100K ECL Data and Clock I/Os
♦ Output Monitor Provides Lock Detection
♦ No External Reference Clock Required
The MAX3270 has differential ECL input and output
interfaces, so it is less susceptible to noise in a high-
fre q ue nc y e nvironme nt. The fully inte g ra te d PLL
includes an integrated phase-frequency detector that
eliminates the need for external references.
______________Ord e rin g In fo rm a t io n
________________________Ap p lic a t io n s
PART
TEMP. RANGE
PIN-PACKAGE
155Mbps (STM-1/OC-3)/622Mbps (STM-4/
OC-12) SDH/SONET Transmission Systems
MAX3270EMH
-40°C to +85°C
44 MQFP
155Mbps/622Mbps ATM/SONET Access Nodes
Add/Drop Multiplexers
Cross-Connects
Pin Configuration appears at end of data sheet.
___________________________________________________Typ ic a l Op e ra t in g Circ u it
-2V
-4.5V
450Ω
+5V
50Ω
26
50Ω
50Ω
50Ω
11 39 17 19 38
7
16 15
5
24 27
32
29
3
SDIP
RDOP
RDON
25
31
30
50Ω
RCOP
RCON
-2V
4
41
42
28
SDIN
PHADJ
CRP
50Ω
MAX3270
VR
9
FILP
FILG
13
18
20
14
2.2µF
20Ω
20Ω
EXCS
8
-2V
CRS
RST
10
6
FILN
FM
+5V
2.2µF
EXC
2
12
1
35 36 22 21 34
50Ω
-4.5V
DIGITAL
SUPPLY
-2V
BYPASS SUPPLIES WITH 0.1µF AND 0.01µF CAPACITORS.
DECOUPLE AVEE1, AVEE2, AND GVEE SUPPLY PINS.
EXCS AND CRS ARE CONNECTED FOR
622Mbps OPERATION.
-4.5V
-4.5V
-4.5V
ANALOG SUPPLY
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .