MAXIM MAX3840 +3.3V, 2.7Gbps Dual 2 × 2 Crosspoint Switch Data Manual
Summary
This high-performance MAX3840 is a specialized dual 2x2 asynchronous crosspoint switch designed for mission-critical, high-speed data switching in telecommunications systems (SDH/SONET/DWDM). It features fully differential CML I/O and supports up to 2.7 Gbps for signal loop-through and protection channel switching applications. The manual provides detailed technical specifications detailing electrical characteristics, jitter performance, and power management controls for system deployment by engineers designing complex high-bandwidth backplanes or add-drop multiplexers.
Page 1 Text Content
19-1854; Rev 5; 9/07
+3.3V, 2.7Gbps Dual 2 ✕ 2 Crosspoint Switch
General Description Features
The MAX3840 is a dual 2 ✕ 2 asynchronous crosspoint Single +3.3V Supply switch for SDH/SONET DWDM and other high-speed
460m W Power Consumption
data switching applications where serial data stream loop-through and protection channel switching are
2ps RMS Random Jitter
required. It is ideal for OC-48 systems with forward
7ps P-P Deterministic Jitter
error correction. A high-bandwidth, fully differential sig- nal path minimizes jitter accumulation, crosstalk, and
Power-Down Feature for Deselected Outputs
signal skew. Each 2 ✕ 2 crosspoint switch can fan out
and/or multiplex up to 2.7Gbps data and 2.7GHz clock CML Inputs/Outputs
signals. All inputs and outputs are current mode logic
6ps Channel-to-Channel Skew
(CML) compatible and easily adaptable to interface
with an AC-coupled LVPECL signal. When not used, 100ps Output Edge Speed
each CML output stage can be powered down with an
5mm ✕ 5mm 32 QFN or Thin QFN Package
enable control to conserve power. The typical power consumption is 460m W with all outputs enabled. The MAX3840 is compatible with the MAX3876 2.5Gbps clock and data recovery (CDR) circuit.
Ordering Information
The MAX3840 is available in a 32-pin exposed-pad QFN package (5mm ✕ 5mm footprint) and operates
PIN - PK G
from a +3.3V supply over a temperature range of -40°C PART TEMP RANGE
PA C K A G E C O D E
to +85°C.
MAX3840ETJ+ -40°C to +85°C 32 TQFN T3255-3
________________________Applications
MAX3840EGJ -40°C to +85°C 32 QFN G3255-1
SDH/SONET and DWDM Transport Systems
+Denotes a lead-free package.
Add-Drop Multiplexers ATM Switch Cores WDM Cross-Connects
Pin Configurations appear at end of data sheet.
High-Speed Backplanes
Typical Application Circuit
VCC = +3.3V
DATA MAX3869
MAX3866 MAX3876
LASER
TIA AND LA CDR
DRIVER
CLOCK
MAX3840
CROSSPOINT MAX3869
MAX3866 MAX3876
SWITCH LASER
TIA AND LA CDR
DRIVER
CLOCK
ZO = 50Ω TRANSMISSION LINE
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Page Summary Contents For MAXIM MAX3840 +3.3V, 2.7Gbps Dual 2 × 2 Crosspoint Switch Data Manual
Manual Details
| Brand | Dual |
|---|---|
| Pages | 8 |
| File Size | 125.65 KB |
| Published | May 20, 2026 |
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Frequently Asked Questions
What type of common signaling interface does the MAX3840 utilize?
All inputs and outputs are current mode logic (CML).
How can I reduce power consumption when some outputs are not needed?
The device features a Power-Down Feature that allows deselected outputs to conserve power.
What voltage supply is required for optimal operation?
It requires a single +3.3V supply voltage (VCC).
In what types of high-speed network systems is this switch best suited?
It is ideal for OC-48, SDH/SONET, and DWDM transport systems.