MAX4670

Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switches


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Description

The MAX4670 is an integrated T1/E1/J1 analog protection switch for 1+1 and N+1 line-card redundancy applications. It protects two T1/E1/J1 ports by combining eight SPDT switches in a single package. The switch is optimized for high-return loss and pulse-template performance in T1/E1/J1 long-haul and short-haul applications. The part offers built-in chip-side surge protection capability for short-haul intrabuilding applications.

The MAX4670 replaces two diode arrays or two transient voltage suppressors (TVSs) and four dual-SPDT relays, significantly reducing board space and simplifying PC board routing. The MAX4670 pinout is targeted for T1/E1/J1 applications, resulting in a simplified layout when interfacing with standard line transformers and line interface units (LIUs).

The MAX4670 has four 1.0Ω (max) on-resistance switches with 60pF/40pF on-/off-capacitances for interfacing to the LIU transmitter outputs. The MAX4670 also includes four 10Ω (max) on-resistance switches with low 24pF/12pF on-/off-capacitances for interfacing to the LIU receiver inputs. Four logic inputs control the receive/transmit pairs, in addition to a active-low SWITCH input that connects all switches to the system's protection bus.

The MAX4670 operates from a single +2.7V to +3.6V supply and is available in 32-pin thermally enhanced TQFN package. The MAX4670 is specified over the -40°C to +85°C operating temperature range.
MAX4670: Functional Diagram MAX4670: Functional Diagram Enlarge+

Key Features

  • Single +3.3V Supply Voltage
  • Quad-DPDT/Octal-SPDT Switches Support Two T1/E1/J1 Ports
  • Low RON
  • 0.7Ω (typ) in Transmit Path; 5Ω (typ) in Receive Path
  • Low CON/COFF
    • 60pF/40pF (typ) in Transmit Path
    • 24pF/12pF (typ) in Receive Path
  • Chip Surge Protection
    • IEC 61000-4-5 (8µs to 20µs Surge)
    • Class 2 (±1kV)
  • -70dB (typ) Crosstalk/Off-Isolation (3MHz)
  • Small, 32-Pin TQFN Package
Part NumberConfig.ChannelsNormal PositionVSUPPLY (Single)
(V)
VSUPPLY (Single)
(V)
VSIGNAL
(V)
VSIGNAL
(V)
Dynamic Range (max)
(V)
RON
(Ω)
RFLAT(ON)
(Ω)
Bandwidth
(MHz)
IL(OFF)
(nA)
tON
(ns)
tOFF
(ns)
QINJECTION
(pC)
CON
(pF)
COFF
(pF)
Package/PinsBudgetary
Price
minmaxminmaxmaxmaxtypmaxmaxmaxSee Notes
MAX4670 
2-to-1
DPDT
8Open/Closed2.73.603.63.692300.0140020082412
TQFN/32
$4.79 @1k
See All Switches and Multiplexers (Low Voltage) (163)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Request Reliability Report for: MAX4670 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX4670 Macromodel
  • CAD Symbols and Footprints

  • MAX4670ETJ+
  • MAX4670ETJ+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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