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.
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
Features
MAX4670
Ordering Information
PART*
MAX4670ETJ
PIN-
PACKAGE
32 TQFN
(5mm x 5mm)
SURGE
PROTECTION
YES
PKG
CODE
T3255-4
*This
part operates at a -40°C to +85°C temperature range.
Applications
Optical Multiplexers (ADMs, M13s, etc.)
24 NC3
23 NO3
22 NC4
21 NO4
Pin Configuration
20 NC5
19 NO5
18 NC6
17 NO6
TOP VIEW
Edge Routers
Multiservice Switches
Base Station Controllers (Wireless Infrastructure
Equipment)
Media Gateways (VoIP)
NO2
NC2
NO1
NC1
COM1
25
26
27
28
29
30
31
32
INB 1
*EP
16
15
14
13
NC7
NO7
NC8
NO8
COM8
COM7
IND
V+
MAX4670
12
11
10
9
Functional Diagram/Truth Table appears at end of data sheet.
COM2
INA
V+
COM3 2
COM4 3
GND 4
INC 5
COM5 6
COM6 7
*NOTE:
EXPOSED PADDLE
CONNECTED TO GND
TQFN
________________________________________________________________
Maxim Integrated Products
SWITCH 8
1
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.
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
MAX4670
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V+, IN_,
SWITCH
......................................................-0.3V to +4V
COM_, NO_, NC_ (Note 1) ...........................-0.3V to (V+ + 0.3V)
Continuous Current
NO_, NC_, COM_ (Tx interface)..................................±150mA
NO_, NC_, COM_ (Rx interface) .................................±100mA
Peak Currents
NO_, NC_, COM_ (Tx interface)
(pulsed at 1ms, 10% duty cycle) ................................±300mA
NO_, NC_, COM_ (Rx interface)
(pulsed at 1ms, 10% duty cycle) ................................±200mA
Peak Surge Currents
Poised at 8µs ..................................................................21.4A
Poised at 20µs ................................................................11.9A
Continuous Power Dissipation (T
A
= +70°C)
32-Pin TQFN (derate 21.3mW/°C above +70°C) .......1702mW
38-Pin TSSOP (derate 13.7mW/°C above +70°C) .....1096mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Signals on NO_, NC_, COM_ exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum
current rating.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
Rx INTERFACE
On-Resistance
On-Resistance Match Between
Channels (Note 4)
On-Resistance Flatness (Note 4)
NO_ or NC_ Off-Leakage
Current
COM_ On-Leakage Current
Tx INTERFACE
On-Resistance (Note 5)
On-Resistance Match Between
Channels (Notes 3, 5)
On-Resistance Flatness
(Notes 5, 6)
R
ON
∆R
ON
V+ = 3V, I
COM_
= 100mA, T
A
= +25°C
V
NO_
or V
NC_
= 1.5V
T
A
= T
MIN
to T
MAX
V+ = 3V, I
COM_
= 100mA, T
A
= +25°C
V
NO_
or V
NC_
= 1.5V
T
A
= T
MIN
to T
MAX
V+ = 3V;
I
COM_
= 100mA;
V
NO_
or V
NC_
= 1.0V,
1.5V, 2.0V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0.7
0.03
0.9
1.0
0.150
0.175
0.1
0.18
Ω
0.2
Ω
Ω
R
ON
∆R
ON
V+ = 3V, I
COM_
= 10mA,
V
NO_
or V
NC_
= 1.5V
V+ = 3V, I
COM_
= 10mA,
V
NO_
or V
NC_
= 1.5V
V+ = 3V; I
COM_
= 10mA;
V
NO_
or V
NC_
= 1.0V,
1.5V, 2.0V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
-1
-1
2.0
5
9
10
1.0
1.3
3.0
Ω
3.4
+1
+1
µA
µA
Ω
Ω
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R
FLAT(ON)
I
NO(OFF)
I
NC (OFF)
I
COM(ON)
V+ = 3.6V; V
COM_
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 3.3V, 0.3V
V+ = 3.6V; V
COM_
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 3.3V, 0.3V or floating
R
FLAT(ON)
2
_______________________________________________________________________________________
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
NO_ or NC_ Off-Leakage
Current
COM_ On-Leakage Current
DYNAMIC CHARACTERISTICS
V
NO_
or V
NC_
= 1.5V,
R
L
= 50Ω, C
L
= 35pF,
Figure 2
V
NO
or V
NC
= 1.5V,
R
L
= 50Ω,
C
L
= 35pF, Figure 2
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
80
8
20
300
300
-65
-58
dB
V
ISO1
Tx interface
V
ISO2
V
CT1
V
CT2
Crosstalk (Note 8)
V
CT1
V
CT2
NC_ or NO_ Off-Capacitance
COM_ On-Capacitance
COFFRX
COFFTX
C
COM(ON)TX
C
COM(ON)RX
Tx interface,
Figure 5
R
L
= 50Ω, C
L
= 35pF,
f < 3MHz
R
L
= 50Ω, C
L
= 35pF,
3MHz < f < 30MHz
-78
-30
12
40
24
60
pF
pF
R
L
= 50Ω, C
L
= 35pF,
3MHz < f < 30MHz
R
L
= 50Ω, C
L
= 35pF,
f < 3MHz
R
L
= 50Ω, C
L
= 35pF,
3MHz < f < 30MHz
-40
-65
-50
dB
R
L
= 50Ω, C
L
= 35pF,
f < 3MHz
-60
400
ns
750
200
ns
750
ns
pC
MHz
SYMBOL
I
NO(OFF),
I
NC(OFF)
I
COM(ON)
CONDITIONS
V+ = 3.6V; V
COM_
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 0.3V, 3.3V
V+ = 3.6V; V
COM_
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 0.3V, 3.3V or floating
MIN
-1
-1
TYP
MAX
+1
+1
UNITS
µA
µA
MAX4670
Turn-On Time
t
ON
Turn-Off Time
Break-Before-Make Delay
Charge Injection
On-Channel
3dB Bandwidth
t
OFF
t
D
Q
BW
V
ISO1
R
L
= 50Ω, C
L
= 35pF, Figure 3
V
GEN
= 1.5V, R
GEN
=
0Ω, C
L
= 1nF, Figure 4
Rx interface
Tx interface
Rx interface
Tx interface
R
L
= 50Ω, CL = 35pF,
f < 3MHz
Rx interface
R
L
= 50Ω, C
L
= 35pF,
3MHz < f < 30MHz
V
ISO2
Off-Isolation (Note 7)
Rx interface,
Figure 5
Rx interface f = 1MHz, Figure 6
Tx interface f = 1MHz, Figure 6
f = 1MHz
Rx interface
Tx interface
_______________________________________________________________________________________
3
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
MAX4670
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
DIGITAL I/O (IN_,
SWITCH
)
Input-Low Voltage
Input-High Voltage
Input Leakage Current
SUPPLY
Operating Voltage Range
Supply Current
V+
I+
V+ = 3.6V, V
IN_
= V
SWIT C H
= 0 or V+
2.7
3.6
10
V
µA
V
IL
V
IH
I
IL
V+ = 2.7V
V+ = 3.6V
V
IN_
= 0 or V+, V
SWIT C H
= 0 or V+
1.4
-1
+1
0.5
V
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
The algebraic convention is used in this data sheet. The most negative value is shown in the minimum column.
Devices are 100% tested at hot and room and guaranteed by design at cold.
∆R
ON
= R
ON(MAX)
- R
ON(MIN)
.
Guaranteed by design.
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal ranges.
Note 7:
Off-isolation = 20log
10
[V
COM_
/ (V
NO_
or V
NC_
)], V
COM_
= output, V
NO_
or V
NC_
= input to off switch.
Note 8:
Crosstalk between any two switches.
Typical Operating Characteristics
(V+ = 3.0V, T
A
= +25°C, unless otherwise noted.)
ON-RESISTANCE
vs. COM_VOLTAGE (Tx INTERFACE)
MAX4670 toc01
ON-RESISTANCE vs. COM_ VOLTAGE
OVER TEMPERATURE (Tx INTERFACE)
MAX4670 toc02
ON-RESISTANCE
vs. COM_VOLTAGE (Rx INTERFACE)
MAX4670 toc03
0.9
1.2
1.0
ON-RESISTANCE (Ω)
T
A
= +85°C
0.8
0.6
0.4
T
A
= -40°C
0.2
T
A
= +25°C
10
9
ON-RESISTANCE (Ω)
8
7
6
5
4
3
V+ = 3.6V
0
0.6
1.2
V+ = 3V
1.8
V
COM_
(V)
2.4
3.0
V+ = 2.7V
ON-RESISTANCE (Ω)
0.8
0.7
V+ = 2.7V
V+ = 3V
0.6
V+ = 3.6V
0.5
0
0.6
1.2
1.8
V
COM_
(V)
2.4
3.0
3.6
0
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
V
COM_
(V)
3.6
4
_______________________________________________________________________________________
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
Typical Operating Characteristics (continued)
(V+ = 3.0V, T
A
= +25°C, unless otherwise noted.)
ON-RESISTANCE vs. COM_ VOLTAGE
OVER TEMPERATURE (Rx INTERFACE)
MAX4670 toc04
MAX4670
COM_ LEAKAGE CURRENT
vs. TEMPERATURE (Tx INTERFACE)
MAX4670toc05
12
10
ON-RESISTANCE (Ω)
8
6
4
T
A
= -40°C
2
0
0
T
A
= +85°C
10
LEAKAGE CURRENT (nA)
T
A
= +25°C
1
0.1
0.01
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
V
COM_
(V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
NC_/NO_ LEAKAGE CURRENT
vs. TEMPERATURE (Tx INTERFACE)
MAX4670toc06
COM_ LEAKAGE CURRENT
vs. TEMPERATURE (Rx INTERFACE)
MAX4670 toc07
10
10
LEAKAGE CURRENT (nA)
1
LEAKAGE CURRENT (nA)
85
1
NC_
0.1
NO_
0.1
0.01
-40
-15
10
35
60
TEMPERATURE (°C)
0.01
-40
-15
10
35
60
85
TEMPERATURE (°C)
NC_/NO_ LEAKAGE CURRENT
vs. TEMPERATURE (Rx INTERFACE)
MAX4670 toc08
TURN-ON TIME
vs. SUPPLY VOLTAGE (Tx INTERFACE)
280
250
220
190
160
130
MAX4670 toc09
10
LEAKAGE CURRENT (nA)
1
NC_
0.1
NO_
TURN-ON TIME (ns)
60
85
0.01
-40
-15
10
35
TEMPERATURE (°C)
100
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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