MAX4670 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch

19-3798; Rev 0; 09/06
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
General Description
The MAX4670 is an integrated T1/E1/J1 analog protec-
tion switch for 1+1 and N+1 line-card redundancy
applications. It protects two T1/E1/J1 ports by combin-
ing eight SPDT switches in a single package. The
switch is optimized for high-return loss and pulse-tem-
plate 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 appli-
cations.
The MAX4670 replaces two diode arrays or two tran-
sient voltage suppressors (TVSs) and four dual-SPDT
relays, significantly reducing board space and simplify-
ing 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 switch-
es 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 SWITCH input that con-
nects 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.
Applications
Optical Multiplexers (ADMs, M13s, etc.)
Edge Routers
Multiservice Switches
Base Station Controllers (Wireless Infrastructure
Equipment)
Media Gateways (VoIP)
Functional Diagram/Truth Table appears at end of data sheet.
Features
o Single +3.3V Supply Voltage
o Quad-DPDT/Octal-SPDT Switches Support
Two T1/E1/J1 Ports
o Low R_ON
o 0.7Ω (typ) in Transmit Path; 5Ω (typ) in
Receive Path
o Low C_ON/C_OFF
60pF/40pF (typ) in Transmit Path
24pF/12pF (typ) in Receive Path
o Chip Surge Protection
IEC 61000-4-5 (8µs to 20µs Surge)
Class 2 (±1kV)
o -70dB (typ) Crosstalk/Off-Isolation (3MHz)
o Small, 32-Pin TQFN Package
Ordering Information
PART*
PIN-
SURGE
PACKAGE PROTECTION
PKG
CODE
MAX4670ETJ
32 TQFN
(5mm x 5mm)
YES
T3255-4
*This part operates at a -40°C to +85°C temperature range.
TOP VIEW
Pin Configuration
NO2 25
NC2 26
NO1 27
NC1 28
COM1 29
COM2 30
INA 31
V+ 32
MAX4670
*EP
16 NC7
15 NO7
14 NC8
13 NO8
12 COM8
11 COM7
10 IND
9 V+
*NOTE:
EXPOSED PADDLE
CONNECTED TO GND
TQFN
________________________________________________________________ Maxim Integrated Products 1
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