19-2062; Rev 0; 5/01
2.5Gbps, +3.3V Clock and Data Retiming ICs
with Vertical Threshold Adjust
General Description
Features
The MAX3877/MAX3878 are compact, low-power clock
recovery and data retiming ICs for 2.488Gbps SONET/
SDH applications. The fully integrated phase-locked
loop (PLL) recovers a synchronous clock signal from
the serial NRZ data input, which is retimed by the
recovered clock. An additional 2.488Gbps serial input
is available for system loopback diagnostic testing, or
this input can be connected to a 155MHz reference
clock to maintain a valid clock output in the absence of
data transitions. The MAX3877/MAX3878 provide verti-
cal threshold and phase-adjust control to optimize sys-
tem BER in DWDM applications.
o Exceeds ANSI, ITU, and Bellcore SONET/SDH
Specifications
o Adjustable Input Threshold (±±180mV
o ±80mp-p to ±.2mp-p Differential Input Range
o 5480W Power Dissipation (at +3.3mV
o Fully Integrated Clock Recovery and Data
Reti0ing
o Optional Holdover Capability (Using External
Reference ClockV
o 8.883UI
Clock Jitter Generation
RMS
These devices provide both loss-of-lock (LOL) and
loss-of-signal (LOS) monitors. Differential CML outputs
are provided for both clock and data signals on the
MAX3877, and differential PECL outputs are provided
for clock and data signals on the MAX3878.
o Tolerates >2888 Consecutive Identical Digits
o Additional 2.411Gbps Input for Diagnostic
Loopback Testing
o Differential PECL or CML Data and Clock Outputs
o Loss-of-Signal Indicator
The MAX3877/MAX3878 are designed for both section-
regenerator and terminal-receiver applications in OC-
48/STM-16 transmission systems. Their jitter performance
exceeds all of the SONET/SDH specifications. These
devices operate from a single +3.0V to +3.6V supply over
a -40°C to +85°C temperature range. Typical power con-
sumption is only 540mW with a +3.3V supply (MAX3878).
They are available in a 32-pin TQFP-EP package with an
exposed pad, as well as in die form.
o Loss-of-Lock Indicator
Ordering Information
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP-EP*
DICE**
MAX3177EHJ
MAX3877E/D***
MAX3171EHJ
MAX3878E/D***
* Exposed pad
32 TQFP-EP*
DICE**
Applications
Long Haul and Metro Systems with
Optical Amplification
** Dice are designed to operate over this range, but are tested
and guaranteed at T = +25°C only. contact factory for avail-
A
DWDM Transmission Systems
SONET/SDH Receivers and Regenerators
Add/Drop Multiplexers
ability.
*** Future product—contact factory for availability.
Pin Configuration
Digital Cross-Connects
TOP VIEW
SONET/SDH Test Equipment
32 31 30 29 28 27 26 25
GND
1
2
3
4
5
6
7
8
24 V
CC
THADJ
23 SDO+
22 SDO-
V
CC
SDI-
SDI+
21
20
V
CC
V
CC
MAX3877
MAX3878
V
19 SCLKO+
18 SCLKO-
CC
SIS
LREF
17 V
CC
9
10 11 12 13 14 15 16
Typical Operating Circuit appears at end of data sheet.
TQFP
________________________________________________________________ Maxim Integrated Products
±
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.