19-3915; Rev 1; 1/07
High-Bandwidth T1/E1 Dual-SPDT Switches/
4:1 Muxes
General Description
The MAX4818/MAX4819 high-bandwidth, low-on-resis-
tance analog dual SPDT switches/4:1 multiplexers are
designed to serve as integrated T1/E1 protection
switches for 1+1 and N+1 line-card redundancy appli-
cations. Each MAX4818/MAX4819 replaces four
electromechanical relays, significantly reducing board
space, simplifying PC board routing, and reducing
power consumption. These devices operate with ±3.3V
or ±5V dual supplies for applications requiring T1/E1
signal switching in the line side of the interface trans-
former. Internal voltage multipliers drive the analog
switches, yielding excellent linearity and low 4Ω typical
on-resistance within the T1/E1 analog signal range. This
high-bandwidth family of products is optimized for low
return loss and matched pulse template performance in
T1/E1 long-haul and short-haul applications.
The MAX4818/MAX4819 are available in a tiny 16-pin,
5mm x 5mm, thin QFN package and are specified over
the extended -40°C to +85°C temperature range.
Features
♦
Dual SPDT and 4:1 Multiplexer Configurations
♦
Dual-Supply Operation from ±3.3V to ±5V
♦
Single-Supply Operation from +6V to +11V
♦
Hot-Insertion Tolerant with No DC Path to the
Supplies
♦
Low On-Resistance, R
ON
= 4Ω (typ) and 6Ω (max)
♦
Over 350MHz -3dB Signal Bandwidth (MAX4818)
♦
Excellent Crosstalk and Off-Isolation Performance
Over the T1/E1 Signal Spectrum: Over 110dB
Crosstalk Attenuation at 1MHz (MAX4818)
♦
Low Current Consumption of 2mA (max)
♦
-40°C to +85°C Extended Temperature Range
♦
Space-Saving, 16-Pin, 5mm x 5mm Thin QFN
♦
SET Controls All Switches Simultaneously For
Redundancy Switching (MAX4819)
MAX4818/MAX4819
Applications
T1/E1 Redundancy Switching
Base Stations and Base-Station Controllers
Add and Drop Multiplexers
Pin Configurations
NC1
N.C.
10
V+
TOP VIEW
NC2
9
Multi-Service Provisioning Platforms
Edge Routers
Multi-Service-Switches (MSSs)
Digital Loop Carriers
Industrial Applications
Data Acquisition
Telecom Signal Switching
Test Equipment
Avionics
12
11
COM1
IN1
SET
N.C.
13
14
8
7
COM2
IN2
EN
N.C.
MAX4818
15
16
6
+
*EP
5
1
NO1
2
V-
3
GND
4
NO2
THIN QFN (5mm x 5mm)
*EXPOSED PADDLE CONNECTED TO V-
Pin Configurations continued at end of data sheet.
Ordering Information
PART
MAX4818ETE+
MAX4819ETE+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
CONFIGURATION
2 x SPDT
4:1 MUX
PACKAGE CODE
T1655-3
T1655-3
*EP
= Exposed Paddle
Devices are available in lead-free packages.
________________________________________________________________
Maxim Integrated Products
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.
High-Bandwidth T1/E1 Dual-SPDT Switches/
4:1 Muxes
MAX4818/MAX4819
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.)
V+ ............................................................................-0.3V to +6V
V- .............................................................................-6V to +0.3V
V+ to V-...................................................................-0.3V to +12V
IN_, A0, A1, SET, EN ....................................-0.3V to (V+) + 0.3V
NO_, NC_, COM_ ....................................................-12V to +12V
NO_, to COM_, NC_ to COM_ .................................-18V to +18V
Continuous Current (NO_, NC_, COM_) ....................... ±100mA
Continuous Current (Any Other Terminal) ........................±30mA
Peak Current (NO_, NC_, COM_)
(pulsed at 1ms, 10% duty cycle).................................±300mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin Thin QFN 5mm x 5mm (derate 33.3mW/°C
above T
A
= +70°C) ....................................................2667mW
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
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—Dual ±3.3V Supplies
(V+ = +3.3V ±10%, V- = -3.3V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
ANALOG SWITCH
Fault-Free Analog Signal Range
V
COM
_
V
NO
_
V
NC
_
V+ = +3V, V- = -3V,
I
COM
_ = 30mA,
V
NO
_ or V
NC
_ = +3V
(Note 2)
V+ = +3V, V- = -3V,
I
COM
_ = 30mA,
V
NO
_ or V
NC
_ = +3V
(Note 2)
V+ = +3V, V- = -3V,
I
COM
_ = 30mA,
V
NO
_ or V
NC
_ = +3V
(Notes 2, 3)
V+ = +3V, V- = -3V,
I
COM
_ = 30mA,
V
NO
_ or V
NC
_ = -3V, 0V,
+3V (Notes 2, 4)
V+ = +3.6V, V- = -3.6V,
V
COM
_ = -3V, +3V,
V
NO
_ or V
NC
_ = +3V, -3V
V+ = +3.6V, V- = -3.6V,
V
COM
_ = -3V, +3V,
V
NO
_ or V
NC
_ = +3V, -3V
V+ = +3.6V, V- = -3.6V,
V
COM
_ = -3V, +3V,
V
NO
_ or V
NC
_ unconnected
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
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
0.5
0.3
4
V-
4
V+
5
6
5
6.2
0.6
0.8
1.2
1.5
Ω
Ω
Ω
Ω
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4818
On-Resistance
R
ON
MAX4819
On-Resistance
R
ON
On-Resistance Match
Between Channels
∆R
ON
On-Resistance Flatness
R
FLAT(ON)
NO or NC Off-Leakage
Current
I
NO_(OFF)
I
NC_(OFF)
-10
+10
nA
COM Off-Leakage Current
I
COM_(OFF)
-10
+10
nA
COM On-Leakage Current
I
COM_(ON)
-15
+15
nA
2
_______________________________________________________________________________________
High-Bandwidth T1/E1 Dual-SPDT Switches/
4:1 Muxes
ELECTRICAL CHARACTERISTICS—Dual ±3.3V Supplies (continued)
(V+ = +3.3V ±10%, V- = -3.3V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
FAULT
Fault Analog Signal Range
V
COM
_
V
NO
_
V
NC
_
I
NO
_
I
NC
_
V+ = +3.3V, V- = -3.3V
-11
+11
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4818/MAX4819
NO or NC Off-Leakage Current
V+ = +3.3V, V- = -3.3V,
V
COM
_ = +11V, -11V,
V
NO
_ or V
NC
_ = -5.5V, +5.5V
V+ = +3.3V, V- = -3.3V,
V
COM
_ = +11V, -11V,
V
NO
_ or V
NC
_ = -5.5V, +5.5V
R
L
= 50Ω, f = 1.024MHz, Figure 4
R
L
= 50Ω, f = 30MHz, Figure 4
R
L
= 50Ω, f = 1.024MHz
R
L
= 50Ω, f = 30MHz
V
COM
_ to V
NO
_ or V
NC
_,
R
L
= 50Ω, f = 1.024MHz, Figure 4
V
COM
_ to V
NO
_ or V
NC
_,
R
L
= 50Ω, f = 30MHz, Figure 4
R
S
= R
L
= 50Ω, Figure 4
f = 1MHz, Figure 5
f = 1MHz, Figure 5
f = 1MHz, Figure 5
C
L
= 1.0nF, V
GEN
= 0,
R
GEN
= 0, Figure 3
V
NO
_, V
NC
_, V
COM
_ = -11V
V
NO
_ or V
NC
_= +3V,
R
L
= 300Ω,
C
L
= 35pF, Figure 2
V
NO
_ or V
NC
_= +3V,
R
L
= 300Ω,
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
MAX4818
MAX4819
MAX4818
MAX4819
MAX4818
MAX4819
MAX4818
MAX4819
-1
+1
µA
COM Off-Leakage Current
I
COM
_
-1
+1
µA
SWITCH DYNAMIC CHARACTERISTICS
MAX4818
Crosstalk (Note 5)
MAX4819
All-Hostile Crosstalk (Note 6)
V
CT1
V
CT2
V
HCT1
V
HCT2
V
ISO1
Off-Isolation (Note 7)
V
ISO2
On-Channel -3dB Bandwidth
COM On-Capacitance
COM Off-Capacitance
NC/NO Off-Capacitance
Charge Injection
Fault Recovery Time
Turn-On Time
BW
C
ON(COM_)
C
OFF(COM_)
C
OFF
Q
t
REC
t
ON
110
77
50
17
60
dB
30
350
220
20
40
15
30
7
35
60
128
20
50
50
0.5
1
1
128
µs
µs
µs
MHz
pF
pF
pF
pC
µs
dB
dB
Turn-Off Time
Power-Up Delay
t
OFF
t
DEL
_______________________________________________________________________________________
3
High-Bandwidth T1/E1 Dual-SPDT Switches/
4:1 Muxes
MAX4818/MAX4819
ELECTRICAL CHARACTERISTICS—Dual ±3.3V Supplies (continued)
(V+ = +3.3V ±10%, V- = -3.3V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage Low
Input Voltage High
Input Leakage Current
POWER SUPPLY
Quiescent Positive Supply
Current
Quiescent Negative Supply
Current
Positive Supply Voltage
Negative Supply Voltage
I+
I-
V+
V-
V+ = +3.6V, V- = -3.6V, V
IN_
= 0 or V+
V+ = +3.6V, V- = -3.6V, V
IN_
= 0 or V+
3.0
-3.6
0.8
0.8
2
2
3.6
-3.0
mA
mA
V
V
SYMBOL
V
IL
V
IH
I
IN
V
IN_
= 0 or V+
2.4
-1
+1
CONDITIONS
MIN
TYP
MAX
0.8
UNITS
V
V
µA
LOGIC INPUT (IN_, EN, SET, A0, A1)
ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies
(V+ = +5V ±10%, V- = -5V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
ANALOG SWITCH
Fault-Free Analog Signal Range
V
COM_
V
NO_
V
NC_
R
ON
T
A
= +25°C
V+ = +4.5V, V- = -4.5V,
I
COM_
= 30mA,
T
A
= T
MIN
to
V
NO_
or V
NC_
= +3V (Note 2) T
MAX
T
A
= +25°C
V+ = +4.5V, V- = -4.5V,
I
COM_
= 30mA,
T
A
= T
MIN
to
V
NO_
or V
NC_
= +3V (Note 2) T
MAX
V+ = +4.5V, V- = -4.5V,
I
COM_
= 30mA,
V
NO_
or V
NC_
= +3V
(Notes 2, 3)
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
0.5
V-
4
V+
5
6
4
5
6.2
0.3
0.6
0.8
1.2
1.5
Ω
Ω
Ω
Ω
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4818
On-Resistance
MAX4819
On-Resistance
R
ON
On-Resistance Match
Between Channels
∆R
ON
On-Resistance Flatness
R
FLAT(ON)
V+ = +4.5V, V- = -4.5V,
T
A
= +25°C
I
COM_
= 30mA,
V
NO_
or V
NC_
= -3V, 0V, +3V T
A
= T
MIN
to
T
MAX
(Notes 2, 4)
V+ = +5.5V, V- = -5.5V,
V
COM_
= -5V, +5V,
V
NO_
or V
NC_
= +5V, -5V
-10
NO or NC Off-Leakage Current
I
NO_(OFF)
I
NC_(OFF)
+10
nA
COM Off-Leakage Current
V+ = +5.5V, V- = -5.5V,
I
COM_(OFF)
V
COM_
= -5V, +5V,
V
NO_
or V
NC_
= +5V, -5V
-10
+10
nA
4
_______________________________________________________________________________________
High-Bandwidth T1/E1 Dual-SPDT Switches/
4:1 Muxes
ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies (continued)
(V+ = +5V ±10%, V- = -5V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
COM On-Leakage Current
FAULT
Fault Analog Signal Range
V
COM_
V
NO_
V
NC_
I
NO_
I
NC_
V+ =5V, V- = -5V
V+ = 5V, V- = -5V,
V
NO_
or V
NC_
= +11V, -11V,
V
COM_
= -5.5, +5.5V
V+ = 5V, V- = -5V,
V
NO_
or V
NC_
= +11V, -11V,
V
COM_
= -5.5, +5.5V
R
L
= 50Ω, f = 1.024MHz, Figure 4
R
L
= 50Ω, f = 30MHz, Figure 4
R
L
= 50Ω, f = 1.024MHz
R
L
= 50Ω, f = 30MHz
V
COM_
to V
NO_
or V
NC_,
R
L
= 50Ω, f = 1.024MHz, Figure 4
V
COM_
to V
NO_
or V
NC_,
R
L
= 50Ω, f = 30MHz, Figure 4
R
S
= R
L
= 50Ω,
Figure 4
MAX4818
MAX4819
MAX4818
MAX4819
MAX4818
MAX4819
MAX4818
MAX4819
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
128
0.5
-11
+11
V
SYMBOL
I
COM_(ON)
CONDITIONS
V+ = +5.5V, V- = -5.5V,
V
COM_
= -5V, +5V,
V
NO_
or V
NC_
unconnected
MIN
-15
TYP
MAX
+15
UNITS
nA
MAX4818/MAX4819
NO or NC Off-Leakage Current
-1
+1
µA
COM Off-Leakage Current
I
COM_
-1
+1
µA
SWITCH DYNAMIC CHARACTERISTICS
MAX4818
Crosstalk (Note 5)
MAX4819
All-Hostile Crosstalk (Note 6)
V
CT1
V
CT2
V
HCT1
V
HCT2
V
ISO1
V
ISO2
On-Channel -3dB Bandwidth
COM On-Capacitance
COM Off-Capacitance
NC/NO Off-Capacitance
Charge Injection
Fault Recovery Time
Turn-On Time
BW
110
77
50
17
60
dB
30
350
220
20
40
15
30
7
35
60
128
20
50
50
1
1
µs
µs
µs
MHz
pF
pF
pF
pC
µs
dB
dB
Off-Isolation
(Note 6)
C
ON(COM_)
f = 1MHz, Figure 5
C
OFF(COM_)
f = 1MHz, Figure 5
C
OFF
Q
t
REC
t
ON
f = 1MHz, Figure 5
C
L
= 1.0nF, V
GEN
= 0,
R
GEN
= 0, Figure 3
V
NO_
, V
NC_
, V
COM_
= -11V
V
NO_
or V
NC_
= +3V,
R
L
= 300Ω,
C
L
= 35pF, Figure 2
V
NO_
or V
NC_
= +3V,
R
L
= 300Ω,
C
L
= 35pF, Figure 2
Turn-Off Time
Power-Up Delay
t
OFF
t
DEL
_______________________________________________________________________________________
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
