19-4800; Rev 0; 3/00
3.3V, 622Mbps LVDS,
Dual 4:2 Crosspoint Switch
Features
The MAX3640 has a unique power-saving feature.
When a set of four output channels has been de-selected, the output drivers are powered down to reduce
power consumption by 165mW. The fully differential
architecture ensures low crosstalk, jitter accumulation,
and signal skew.
The MAX3640 is available in a 48-pin TQFP package
and operates from a +3.3V supply over the 0°C to
+85°C temperature range.
o Single +3.3V Supply
o 257mW Power Consumption (four output
channels enabled)
o 2.8psRMS Output Random Jitter
o 42ps Output Deterministic Jitter
o Power-Down Feature for Deselected Outputs
o 110ps Channel-to-Channel Skew
o 240ps Output Edge Speed
o LVDS Inputs/Outputs
o LVDS Output 3-State Enable
Ordering Information
Applications
SONET/SDH Backplanes
PART
TEMP. RANGE
High-Speed Parallel Links
MAX3640UCM
0°C to +85°C
Digital Cross-Connects
PIN-PACKAGE
48 TQFP
Pin Configuration appears at end of data sheet.
System Interconnects
ATM Switch Cores
Typical Operating Circuit
SONET
SOURCE A
MAX3869
LASER DRIVER
OPTICAL
TRANSCEIVER
2.5Gbps
MAX3831
4-CHANNEL
INTERCONNECT
MUX/DEMUX
MAX3640
CROSSPOINT
SWITCH
SONET
SOURCE B
622Mbps
622Mbps
MAX3866
TIA AND LA
MAX3876
CDR
PARALLEL DATA
OUTPUT
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3640
General Description
The MAX3640 is a dual-path crosspoint switch for use
at OC-12 data rates. The MAX3640 can be used to
receive and transmit 622Mbps low-voltage differential
signals (LVDS) across a backplane with minimum jitter
accumulation. Each path incorporates input buffers,
multiplexers, a crosspoint switch, and output drivers.
The four output channels have a redundant set of outputs for test or fanning purposes. The device offers signal-path redundancy for critical data streams.
