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Data Sheet

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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 1.0 (max) on-resistance switches with 60pF/40pF on-/off-capacitances for interfacing to the LIU transmitter outputs. The MAX4670 also includes four 10 (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.

Key Features

Single +3.3V Supply Voltage Quad-DPDT/Octal-SPDT Switches Support Two T1/E1/J1 Ports Low RON 0.7 (typ) in Transmit Path; 5 (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

Evaluation Kits

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Reliability Reports

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Software/Models

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Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-4 of 4
MAX4670	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX4670ETJ			THIN QFN;32 pin;26 mm² Dwg: 21-0140L (PDF) Use pkgcode/variation: T3255-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX4670ETJ-T			THIN QFN;32 pin;26 mm² Dwg: 21-0140L (PDF) Use pkgcode/variation: T3255-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX4670ETJ+			THIN QFN;32 pin;26 mm² Dwg: 21-0140L (PDF) Use pkgcode/variation: T3255+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX4670ETJ+T			THIN QFN;32 pin;26 mm² Dwg: 21-0140L (PDF) Use pkgcode/variation: T3255+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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