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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)
Features
♦ Single +3.3V Supply Voltage
♦ Quad-DPDT/Octal-SPDT Switches Support
Two T1/E1/J1 Ports
♦ Low R
ON
♦ 0.7Ω (typ) in Transmit Path; 5Ω (typ) in
Receive Path
♦ Low C
ON
/C
OFF
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
MAX4670
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
________________________________________________________________ Maxim Integrated Products 1
19-3798; Rev 0; 09/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
1
INB
2
COM3
3
COM4
4
GND
5
INC
6
COM5
7
COM6
8
SWITCH
24
NC3
23
NO3
22
NC4
21
NO4
20
NC5
19
NO5
18
NC6
17
NO6
9
V+
10
IND
11
COM7
12
COM8
13
NO8
14
NC8
15
NO7
16
NC7
32
V+
31
INA
30
COM2
29
COM1
28
NC1
27
NO1
26
NC2
25
NO2
MAX4670
*EP
TQFN
*NOTE:
EXPOSED PADDLE
CONNECTED TO GND
Pin Configuration
Ordering Information
PART*
PIN-
PACKAGE
SURGE
PROTECTION
PKG
CODE
MAX4670ETJ
32 TQFN
(5mm x 5mm)
YES T3255-4
*This part operates at a -40°C to +85°C temperature range.
Functional Diagram/Truth Table appears at end of data sheet.
Seitenansicht 0
1 2 3 4 5 6 ... 20 21

Inhaltsverzeichnis

Seite 1 - Long-Haul Protection Switch

General DescriptionThe MAX4670 is an integrated T1/E1/J1 analog protec-tion switch for 1+1 and N+1 line-card redundancyapplications. It protects two T

Seite 2

MAX4670LIU Interface RecommendationsThe MAX4670 low 0.7Ω (typ) on-resistance is ade-quate, even in applications where the LIUs require noexternal seri

Seite 3

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 4

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch12 _______________________________________________________________________________

Seite 5

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 6

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch14 _______________________________________________________________________________

Seite 7

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 8

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch16 _______________________________________________________________________________

Seite 9

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 10

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch18 _______________________________________________________________________________

Seite 11

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 12

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch2 ________________________________________________________________________________

Seite 13

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection SwitchMaxim cannot assume responsibility for use of any circuitry other than circuitry e

Seite 14

All Datasheets Cannot Be Modified Without Permission Copyright © Each Manufacturing Company This datasheet has been downloaded from: www.EEworld.c

Seite 15

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 16

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch4 ________________________________________________________________________________

Seite 17

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 18

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch6 ________________________________________________________________________________

Seite 19

MAX4670Integrated T1/E1/J1 Short-Haul andLong-Haul Protection Switch__________________________________________________________________________________

Seite 20

MAX4670Detailed DescriptionThe MAX4670 is a quad-DPDT/octal-SPDT analog switchoptimized for T1/E1/J1 line-card redundancy protectionapplications. This

Seite 21

In a switching-card architecture, a common switchingcard contains all the protection switches for the T1/E1/J1lines entering the system (see Figures 7

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