Maxim MAX4816ETE High-bandwidth, t1/e1, spst analog switch Datasheet

19-3951; Rev 2; 1/07
High-Bandwidth, T1/E1, SPST Analog Switches
The MAX4815/MAX4816/MAX4817 high-bandwidth,
low-on-resistance, quad-SPST analog switches are
designed to serve as integrated T1/E1 protection
switches for 1+1 and N+1 line-card redundancy applications. Each MAX4815/MAX4816/MAX4817 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
transformer. Internal voltage multipliers drive the analog
switches, yielding excellent linearity and low 3.7Ω typical on-resistance within the T1/E1 analog signal range.
This high-bandwidth (550MHz typical) family of products is optimized for low return loss and matched pulse
template performance in T1/E1 long-haul and short-haul
applications.
The MAX4815/MAX4816/MAX4817 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
♦ Quad-SPST NO, NC, and NC/NO 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, RON = 3.7Ω (typ) and 6Ω
(max)
♦ Over 550MHz, -3dB Signal Bandwidth
♦ Excellent Crosstalk and Off-Isolation Performance
Over the T1/E1 Signal Spectrum: 110dB Crosstalk
Attenuation at 1MHz
♦ Low Current Consumption of 2mA (max)
♦ -40°C to +85°C Extended Temperature Range
♦ Space-Saving, 16-Pin, 5mm x 5mm Thin QFN
Pin Configurations
N.C.
NC3
TOP VIEW
Base Stations and Base-Station Controllers
V+
T1/E1 Redundancy Switching
NC2
Applications
12
11
10
9
Add and Drop Multiplexers
Multiservice Provisioning Platforms
Edge Routers
COM2
13
IN2
14
8
COM3
7
IN3
6
IN4
5
COM4
MAX4815
Multiservice Switches (MSSs)
IN1
Digital Loop Carriers
COM1
15
16
+
*EP
3
4
NC4
NC1
Telecom Signal Switching
2
GND
1
Data Acquisition
V-
Industrial Applications
THIN QFN (5mm x 5mm)
*EXPOSED PADDLE CONNECTED TO V-
Test Equipment
Avionics
Pin Configurations continued at end of data sheet.
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX4815ETE+
PART
-40°C to +85°C
16 TQFN-EP*
CONFIGURATION
PKG CODE
4 x SPST NC
T1655-3
MAX4816ETE+
-40°C to +85°C
16 TQFN-EP*
4 x SPST NO
T1655-3
MAX4817ETE+
-40°C to +85°C
16 TQFN-EP*
4 x SPST NC/NO
T1655-3
*EP = Exposed paddle.
Devices are available in lead-free packaging.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4815/MAX4816/MAX4817
General Description
MAX4815/MAX4816/MAX4817
High-Bandwidth, T1/E1, SPST Analog Switches
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_ ................................................................-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 (TA = +70°C)
16-Pin Thin QFN 5mm x 5mm (derate 33.3mW/°C
above +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%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Fault-Free Analog Signal Range
On-Resistance (Note 2)
On-Resistance Match
Between Channels (Notes 2, 3)
VCOM_
VNO_
VNC_
RON
ΔRON
On-Resistance Flatness
(Notes 2, 4)
RFLAT(ON)
NO or NC Off-Leakage
Current
INO_(OFF)
INC_(OFF)
V-
V+ = +3V, V- = -3V,
ICOM_ = 30mA,
VNO_ or VNC_ = +3V
V+ = +3V, V- = -3V,
ICOM_ = 30mA,
VNO_ or VNC_ = +3V
V+ = +3V, V- = -3V,
ICOM_ = 30mA;
VNO_ or VNC_ = -3V,
0V, +3V
TA = +25°C
3.7
5
Ω
TA = TMIN to TMAX
6
TA = +25°C
0.1
0.6
Ω
TA = TMIN to TMAX
0.8
TA = +25°C
0.4
1.2
Ω
TA = TMIN to TMAX
1.5
V+ = +3.6V, V- = -3.6V;
VCOM_ = -3V, +3V;
VNO_ or VNC_ = +3V, -3V
-10
+10
nA
COM Off-Leakage Current
V+ = +3.6V, V- = -3.6V;
ICOM_(OFF) VCOM_ = -3V, +3V;
VNO_ or VNC_ = +3V, -3V
-10
+10
nA
COM On-Leakage Current
ICOM_(ON)
V+ = +3.6V, V- = -3.6V;
VCOM_ = -3V, +3V;
NO_ or NC_ unconnected
-15
+15
nA
V+ = +3.3V, V- = -3.3V
-11
+11
V
FAULT
Fault Analog Signal Range
2
VCOM_
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
MAX4815/MAX4816/MAX4817
ELECTRICAL CHARACTERISTICS—Dual ±3.3V Supplies (continued)
(V+ = +3.3V ±10%, V- = -3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
NO or NC Off-Leakage Current
COM Off-Leakage Current
SYMBOL
INO_
INC_
ICOM_
CONDITIONS
MIN
TYP
MAX
UNITS
V+ = +3.3V, V- = -3.3V; VNO_ or
VNC_ = +11V, -11V; VCOM_ = -5.5V, +5.5V
-1
+1
µA
V+ = +3.3V, V- = -3.3V; VCOM_ = +11V, -11V;
VNO_ or VNC_ = -5.5V, +5.5V
-1
+1
µA
SWITCH DYNAMIC CHARACTERISTICS
Crosstalk (Note 5)
VCT1
RL = 50Ω, f = 1.024MHz, Figure 4
110
VCT2
RL = 50Ω, f = 30MHz, Figure 4
77
VISO1
VCOM_ to VNO_ or VNC_,
RL = 50Ω, f = 1.024MHz, Figure 4
60
VISO2
VCOM_ to VNO_ or VNC_,
RL = 50Ω, f = 30MHz, Figure 4
30
RS = RL = 50Ω, Figure 4
Off-Isolation (Note 6)
On-Channel -3dB Bandwidth
dB
550
MHz
COM On-Capacitance
CON(COM_) f = 1MHz, Figure 5
10
pF
COM Off-Capacitance
COFF(COM_) f = 1MHz, Figure 5
7
pF
NC/NO Off-Capacitance
Charge Injection
BW
dB
COFF
Q
f = 1MHz, Figure 5
7
pF
CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3
55
pC
µs
Fault Recovery Time
tREC
VNO_, VNC_, VCOM_ = -11V
128
tON
VNO_ or VNC_ = +3V,
RL = 300Ω,
CL = 35pF, Figure 2
20
Turn-On Time
Turn-Off Time
tOFF
Power-Up Delay
VNO_ or VNC_ = +3V,
RL = 300Ω,
CL = 35pF, Figure 2
TA = +25°C
40
µs
TA = TMIN to TMAX
40
TA = +25°C
0.5
1
µs
TA = TMIN to TMAX
1
tDEL
128
µs
LOGIC INPUT (IN_)
Input-Voltage Low
VIL
Input-Voltage High
VIH
0.8
Input Leakage Current
IIN
VIN = 0 or V+
Quiescent Positive Supply
Current
I+
V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+
Quiescent Negative Supply
Current
I-
V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+
Negative Supply Voltage
V-
Positive Supply Voltage
V+
2.4
V
V
-1
+1
µA
0.8
2
mA
0.8
2
mA
-3.6
-3.0
V
3.0
3.6
V
POWER SUPPLY
_______________________________________________________________________________________
3
MAX4815/MAX4816/MAX4817
High-Bandwidth, T1/E1, SPST Analog Switches
ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies
(V+ = +5V ±10%, V- = -5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCH
Fault-Free Analog Signal Range
VCOM_
VNO_
VNC_
VTA = +25°C
RON
V+ = +4.5V, V- = -4.5V,
ICOM_ = 30mA,
VNO_ or VNC_ = +3V
TA = TMIN to
TMAX
ΔRON
V+ = +4.5V, V- = -4.5V,
ICOM_ = 30mA,
VNO_ or VNC_ = +3V
TA = TMIN to
TMAX
On-Resistance Flatness
(Notes 2, 4)
RFLAT(ON)
V+ = +4.5V, V- = -4.5V,
ICOM_ = 30mA;
VNO_ or VNC_ = -3V, 0V,
+3V
NO or NC Off-Leakage
Current
INO_(OFF)
INC_(OFF)
On-Resistance (Note 2)
On-Resistance Match
Between Channels (Notes 2, 3)
3.7
5
6
TA = +25°C
0.1
0.6
0.8
TA = +25°C
0.4
Ω
Ω
1.2
Ω
TA = TMIN to
TMAX
1.5
V+ = +5.5V, V- = -5.5V;
VCOM_ = -5V, +5V;
VNO_ or VNC_ = +5V, -5V
-10
+10
nA
COM Off-Leakage Current
V+ = +5.5V, V- = -5.5V;
ICOM_(OFF) VCOM_ = -5V, +5V;
VNO_ or VNC_ = +5V, -5V
-10
+10
nA
COM On-Leakage Current
ICOM_(ON)
V+ = +5.5V, V- = -5.5V;
VCOM_ = -5V, +5V;
NO_ or NO_ unconnected
-15
+15
nA
V+ = +5V, V- = -5V
-11
+11
V
INO_
INC_
V+ = +5V, V- = -5V;
VNO_ or VNC_ = +11V, -11V;
VCOM_ = -5.5V, +5.5V
-1
+1
µA
ICOM_
V+ = +5V, V- = -5V;
VCOM_ = +11V, -11V;
VNO_ or VNC_ = -5.5V, +5.5V
-1
+1
µA
FAULT
Fault Analog Signal Range
NO or NC Off-Leakage Current
COM Off-Leakage Current
VCOM_
VNO_
VNC_
SWITCH DYNAMIC CHARACTERISTICS
Crosstalk (Note 5)
4
VCT1
RL = 50Ω, f = 1.024MHz, Figure 4
110
VCT2
RL = 50Ω, f = 30MHz, Figure 4
77
_______________________________________________________________________________________
dB
High-Bandwidth, T1/E1, SPST Analog Switches
(V+ = +5V ±10%, V- = -5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
VCOM_ to VNO_ or VNC_,
RL = 50Ω, f = 1.024MHz, Figure 4
60
VISO2
VCOM_ to VNO_ or VNC_,
RL = 50Ω, f = 30MHz, Figure 4
30
On-Channel -3dB Bandwidth
COM On-Capacitance
BW
RS = RL = 50Ω, Figure 4
CON(COM_) f = 1MHz, Figure 5
COM Off-Capacitance
COFF(COM_) f = 1MHz, Figure 5
Charge Injection
COFF
Q
Fault Recovery Time
TYP
VISO1
Off-Isolation (Note 6)
NC/NO Off-Capacitance
MIN
tREC
MAX
UNITS
dB
550
10
MHz
pF
7
pF
7
pF
CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3
55
pC
VNO_, VNC_, VCOM_ = -11V
128
f = 1MHz, Figure 5
TA = +25°C
Turn-On Time
tON
VNO_ or VNC_ = +3V,
RL = 300Ω,
CL = 35pF, Figure 2
TA = TMIN to
TMAX
Turn-Off Time
tOFF
VNO_ or VNC_ = +3V,
RL = 300Ω,
CL = 35pF, Figure 2
TA = TMIN to
TMAX
Power-Up Delay
tDEL
20
µs
40
40
TA = +25°C
0.5
µs
1
1
128
µs
µs
LOGIC INPUT (IN_)
Input-Voltage Low
VIL
Input-Voltage High
VIH
Input Leakage Current
IIN
VIN = 0 or V+
Quiescent Positive Supply
Current
I+
V+ = +5.5V, V- = -5.5V, VIN_ = 0 or V+
Quiescent Negative Supply
Current
I-
V+ = +5.5V, V- = -5.5V, VIN_ = 0 or V+
0.8
V
+1
µA
0.9
2
mA
0.9
2
mA
2.4
V
-1
POWER SUPPLY
Negative Supply Voltage
V-
-5.5
-4.5
V
Positive Supply Voltage
V+
4.5
5.5
V
All parameters are production tested at TA = +85°C and guaranteed by design over specified temperature range.
Guaranteed by design, not production tested.
ΔRON = RON(MAX) - RON(MIN).
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal range.
Note 5: Between any two switches.
Note 6: Off-isolation = 20 x log10 [VCOM_/(VNC_ or VNO_)], VCOM_ = output, VNC_ or VNO_ = input to OFF switch.
Note 1:
Note 2:
Note 3:
Note 4:
_______________________________________________________________________________________
5
MAX4815/MAX4816/MAX4817
ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies (continued)
Typical Operating Characteristics
(V+ = +3.3V, V- = -3.3V, TA = +25°C, unless otherwise noted.)
ON-RESISTANCE
vs. COM_ VOLTAGE
TA = +85°C
TA = +25°C
3
TA = -40°C
2
SUPPLY CURRENT (μA)
4
DUAL ±5V SUPPLIES
5
ON-RESISTANCE (Ω)
ON-RESISTANCE (Ω)
TA = +85°C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
4
TA = +25°C
3
1000
TA = -40°C
2
MAX4815 toc03
DUAL ±3.3V SUPPLIES
5
6
MAX4815 toc01
6
MAX4815 toc02
ON-RESISTANCE
vs. COM_ VOLTAGE
900
800
700
1
0
0
-2.2
-1.1
0
1.1
2.2
700
-15
10
35
60
35
5.0
60
520
480
440
400
360
320
280
240
200
160
120
80
40
0
-40
85
DUAL ±5.5V SUPPLIES
NC_/NO_ = -5V, COM_ = +5V
-40
-15
10
35
60
COM(OFF) LEAKAGE CURRENT
vs. TEMPERATURE
COM(OFF) LEAKAGE CURRENT
vs. TEMPERATURE
COM(ON) LEAKAGE CURRENT
vs. TEMPERATURE
200
NC_/NO_ = +3V, COM_ = -3V
120
NC_/NO_ = -3V, COM_ = +3V
40
240
200
160
NC_/NO_ = +5V, COM_ = -5V
120
80
540
NC_/NO_ = -5V, COM_ = +5V
40
420
360
300
240
120
0
0
-40
-60
10
35
60
85
COM_ = -3V
60
-40
TEMPERATURE (°C)
COM_ = +3V
180
0
-15
DUAL ±3.6V SUPPLIES
480
LEAKAGE CURRENT (pA)
280
LEAKAGE CURRENT (pA)
240
DUAL ±5.5V SUPPLIES
85
MAX4815 toc09
MAX4815 toc07
360
320
5.5
NC_/NO_ = +5V, COM_ = -5V
TEMPERATURE (°C)
DUAL ±3.6V SUPPLIES
-40
4.5
TEMPERATURE (°C)
280
6
NC_/NO_ = -3V, COM_ = +3V
10
4.0
NC/NO(OFF) LEAKAGE CURRENT
vs. TEMPERATURE
NC_/NO_ = +3V, COM_ = -3V
-15
3.5
DUAL-SUPPLY VOLTAGE (V)
DUAL ±3.6V SUPPLIES
-40
85
3.0
TEMPERATURE (°C)
360
80
520
480
440
400
360
320
280
240
200
160
120
80
40
0
-40
5
LEAKAGE CURRENT (pA)
LEAKAGE CURRENT (pA)
750
160
3
MAX4815 toc05
MAX4815 toc04
800
320
1
NC/NO(OFF) LEAKAGE CURRENT
vs. TEMPERATURE
DUAL ±3.3V SUPPLIES
-40
-1
SUPPLY CURRENT
vs. TEMPERATURE
DUAL ±5V SUPPLIES
850
-3
COM_ VOLTAGE (V)
950
900
600
-5
COM_ VOLTAGE (V)
1000
SUPPLY CURRENT (μA)
3.3
MAX4815 toc08
-3.3
MAX4815 toc06
1
LEAKAGE CURRENT (pA)
MAX4815/MAX4816/MAX4817
High-Bandwidth, T1/E1, SPST Analog Switches
-40
-15
10
35
TEMPERATURE (°C)
60
85
-40
-15
10
35
TEMPERATURE (°C)
_______________________________________________________________________________________
60
85
High-Bandwidth, T1/E1, SPST Analog Switches
CHARGE INJECTION
vs. COMMON VOLTAGE
300
COM_ = +5V
180
120
COM_ = -5V
60
-60
100
LOSS (dB)
360
240
120
CHARGE-INJECTION (pC)
LEAKAGE CURRENT (pA)
420
-40
MAX4815 toc11
DUAL ±5.5V SUPPLIES
480
CROSSTALK vs. FREQUENCY
140
MAX4815 toc10
540
MAX4815 toc12
COM(ON) LEAKAGE CURRENT
vs. TEMPERATURE
80
60
40
-80
-100
20
0
0
-60
-15
10
35
60
-120
-5
85
-3
-1
3
5
0.1
FREQUENCY RESPONSE
T1 (100Ω) PULSE TEMPLATE TEST
LOSS (dB)
-20
-3
-4
-40
-60
-5
-80
-6
-7
10
100
1000
1
10
100
FREQUENCY (MHz)
T1 (100Ω) SCOPE SHOT OF THE
INPUT AND OUTPUT OF DEVICE
NORMALIZED AMPLITUDE
1.1
OUTPUT
1V/div
-500
-300
-100
100
300
500
700
E1 (120Ω) SCOPE SHOT OF THE
INPUT AND OUTPUT OF DEVICE
MAX4815 toc18
MAX4815 toc17
1.3
INPUT
1V/div
0
TIME (ns)
E1 (120Ω) PULSE TEMPLATE TEST
MAX4815 toc16
0.3
-0.6
0.1
FREQUENCY (MHz)
0.6
-0.3
-100
1
0.9
NORMALIZED AMPLITUDE
0
-2
1.2
MAX4815 toc14
20
MAX4815 toc13
-1
100
10
FREQUENCY (MHz)
OFF-ISOLATION vs. FREQUENCY
0
0.1
1
VCOM_ (V)
TEMPERATURE (°C)
LOSS (dB)
1
MAX4815 toc15
-40
0.9
0.7
INPUT
1V/div
0.5
0.3
0.1
OUTPUT
1V/div
-0.1
-0.3
200ns/div
-250 -200 -150 -100 -50 0
50 100 150 200 250
100ns/div
TIME (ns)
_______________________________________________________________________________________
7
MAX4815/MAX4816/MAX4817
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25°C, unless otherwise noted.)
E1 (75Ω) SCOPE SHOT OF THE
INPUT AND OUTPUT OF DEVICE
E1 (75Ω) PULSE TEMPLATE TEST
MAX4815 toc20
MAX4815 toc19
1.3
1.1
NORMALIZED AMPLITUDE
MAX4815/MAX4816/MAX4817
High-Bandwidth, T1/E1, SPST Analog Switches
0.9
0.7
INPUT
1V/div
0.5
0.3
0.1
OUTPUT
1V/div
-0.1
-0.3
-250 -200 -150 -100 -50 0
50 100 150 200 250
100ns/div
TIME (ns)
Pin Description
PIN
FUNCTION
MAX4816
MAX4817
1
—
—
NC1
2
2
2
V-
3
3
3
GND
Ground
4
—
—
NC4
Analog Switch Normally Closed Terminal 4
5
5
5
COM4
6
6
6
IN4
Switch 4 Logic-Control Input
Switch 3 Logic-Control Input
Analog Switch Normally Closed Terminal 1
Negative Supply Voltage. Bypass V- to ground with a 0.1µF ceramic
capacitor.
Analog Switch Common Terminal 4
7
7
7
IN3
8
8
8
COM3
9
—
9
NC3
Analog Switch Normally Closed Terminal 3
10
10
10
N.C.
No Connection. Not internally connected.
11
11
11
V+
Analog Switch Common Terminal 3
Positive Supply Voltage. Bypass V+ to ground with a 0.1µF ceramic
capacitor.
12
—
12
NC2
13
13
13
COM2
14
14
14
IN2
Switch 2 Logic-Control Input
15
15
15
IN1
Switch 1 Logic-Control Input
16
16
16
COM1
—
1
1
NO1
Analog Switch Normally Open Terminal 1
—
4
4
NO4
Analog Switch Normally Open Terminal 4
—
9
—
NO3
Analog Switch Normally Open Terminal 3
—
12
—
NO2
EP
8
NAME
MAX4815
EP
EP
EP
Analog Switch Normally Closed Terminal 2
Analog Switch Common Terminal 2
Analog Switch Common Terminal 1
Analog Switch Normally Open Terminal 2
Exposed Paddle. Connect exposed paddle to V- or leave
unconnected.
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
The MAX4815/MAX4816/MAX4817 are high-bandwidth,
low-on-resistance, quad-SPST analog switches targeted
to serve as integrated T1/E1 analog protection switches
for 1+1 and N+1 line-card redundancy applications.
These devices are designed to replace electromechanical relays to save board space, reduce power consumption, and simplify PC board routing. The devices allow
the user to live insert the boards with no adverse effects.
The MAX4815/MAX4816/MAX4817 support ±3.3V or
±5V dual-supply operation, which is required for E1/T1
signal switching in the line-side of the interface transformer. Internal voltage multipliers supply the switches
yielding excellent linearity and low on-resistance, typically 3.7Ω, within the E1/T1 analog signal range. This
high-bandwidth, typically 550MHz, family of devices is
optimized for low return loss and matched pulse template performance in E1/T1 short-haul and long-haul
applications.
Analog Signal Levels
The on-resistance of the MAX4815/MAX4816/MAX4817 is
very low and stable as the analog signals are swept from
V- to V+ (see the Typical Operating Characteristics).
Fault Protection
The fault protection of the MAX4815/MAX4816/
MAX4817 allows the devices to handle input signals of
more than twice the supply voltage without clamping
the signal, latching up, or disturbing other cards in the
system. The device detects when the input voltage
drops below the negative supply. As soon as a fault
condition is detected, the switch is immediately turned
off for 128 clock cycles (typically 128µs). At the end of
the 128µs timeout, the switch is turned back on for one
clock cycle. At the end of the one clock cycle, if the signal is within the operating range, the switch will remain
on. Otherwise, the device will turn the switch off again
for 128 clock cycles. This will repeat until the signal is
within the operating range. In T1/E1 redundancy applications, this can happen when the load resistor (RL) is
removed or disconnected for any reason, as shown in
Figure 1. Without a load resistor, the output voltage
when using a 1:2 transformer can be as high as ±11V.
Hot Insertion
The MAX4815/MAX4816/MAX4817 tolerate hot insertions, thus are not damaged when inserted into a live
backplane. Competing devices can exhibit low impedance when plugged into a live backplane that can
cause high power dissipation leading to damage of the
device itself. The MAX4815/MAX4816/MAX4817 have
relatively high input impedance when V+ and V- are
5V ±10%
TTIP
1:2
MAX4815
MAX4816
MAX4817
COM_
NC_
10V ±10%
RL
LIU
Tx
+
Vo
-
TRING
Figure 1. Fault Protection
unconnected or connected to GND. Therefore, the
devices are not destroyed by a hot insertion. In order to
guarantee data integrity, the V+ and V- supplies must
be properly biased.
Applications Information
T1/E1 N+1 Redundancy
The MAX4815/MAX4816/MAX4817 are designed for
adjacent line-card protection applications. Figures 6 and
7 show a basic architecture for twisted-pair interface
(120Ω E1, or 100Ω T1). Coaxial cable interface (75Ω E1)
can be illustrated with the same figures but without the
single-ended-to-differential conversion stage. A single
protection card can replace up to N line cards in a N+1
redundancy scheme. Figure 6 shows the MAX4815/
MAX4816/MAX4817 sitting in the line cards where they
can reroute any of the input/output signals to a protection
line card. Figure 7 shows the MAX4815/MAX4816/
MAX4817 sitting in a protection-switching card where the
switches are always powered. These figures do not show
the surge protection elements and resistors for line termination/impedance matching.
The low on-resistance and high bandwidth of the
MAX4815/MAX4816/MAX4817 yield good pulse template and return-loss performance (see the Typical
Operating Characteristics). The pulse template tests for
E1 (twisted pair interface 120Ω and coaxial interface
75Ω) and T1 (twisted pair interface 100Ω) were tested
using the Dallas DS2155 single-chip transceiver evaluation board, and twelve switches in parallel with one
switch closed and the other eleven open. The internal
transmit termination feature must be disabled when
using this circuit. To use the same transmit resistors for
E1 twisted pair and coaxial cables, the transmit line
build out control register (TLBC) is set to the value 6Ah.
This sets the driver voltage so the output pulse has the
right amplitude for both 120Ω (twisted pair) and 75Ω
(coaxial) loads. The analog switches were powered
with dual power supplies at ±5V.
_______________________________________________________________________________________
9
MAX4815/MAX4816/MAX4817
Detailed Description
MAX4815/MAX4816/MAX4817
High-Bandwidth, T1/E1, SPST Analog Switches
Test Circuits/Timing Diagrams
V+
3V
V+
NO_ OR NC_
VIN_
3V
50%
0V
MAX4815
MAX4816
IN_ MAX4817 COM_
VIN_
GND
3V
90%
VOUT
90%
VOUT
V-
CL
RL
0V
tOFF
V-
tON
Figure 2. Switch Turn-On/Turn-Off Times
V+
VIN_
IN_ V+
RGEN
NO_ OR NC_
MAX4815
MAX4816
MAX4817
GND
3V
VGEN
VIN_
0V
VOUT
COM_
VOUT
ΔVOUT
VCL
V-
ΔVOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ΔVOUT x CL
Figure 3. Charge Injection
50Ω RESISTOR
ONLY NEEDED
FOR CROSSTALK
AND ISOLATION
V+
0.1μF
VIN
V+
NETWORK
ANALYZER
50Ω
50Ω
COM_
V+
IN_
MAX4815
MAX4816
MAX4817
50Ω
VOUT
NO_, NC_
GND
V-
MEAS
REF
50Ω
50Ω
0.1μF
VMEASUREMENTS ARE STANDARDIZED AGAINST SHORT AND OPEN AT SOCKET TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ OR NC_ TERMINALS.
ON-RESPONSE IS MEASURED BETWEEN COM_ AND ON NO_ OR NC_ TERMINALS.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS.
Figure 4. On-Loss, Off-Isolation, and Crosstalk
10
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
V+
0.1μF
V+
NC_ (OR NO_)
V+
IN_
MAX4815
MAX4816
MAX4817
1MHz
CAPACITANCE
ANALYZER
COM_
V-
GND
0.1μF
V-
Figure 5. Channel Off-/On-Capacitance
______________________________________________________________________________________
11
MAX4815/MAX4816/MAX4817
Test Circuits/Timing Diagrams (continued)
MAX4815/MAX4816/MAX4817
High-Bandwidth, T1/E1, SPST Analog Switches
LINE CARD 1
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
I/O 1
LINE CARD 2
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
I/O 2
LINE CARD N
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
I/O N
PROTECTION LINE CARD
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
BACKPLANE
SINGLE-ENDED-TODIFFERENTIAL
CONVERSION
Figure 6. Adjacent Line-Card Protection Architecture with Switches in the Line Cards for Twisted Pair Cable (120Ω E1, or 100Ω T1).
Figure for coaxial cable (75Ω E1) is the same without the single-ended-to-differential conversion.
12
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
MAX4815/MAX4816/MAX4817
LINE CARD 1
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
I/O 1
LINE CARD 2
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
I/O 2
LINE CARD N
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
I/O N
PROTECTION LINE CARD
MAX4815
MAX4816
MAX4817
T1/E1
LIU
Tx/Rx
PROTECTION SWITCHING CARD
SINGLE-ENDED-TODIFFERENTIAL
CONVERSION
Figure 7. Adjacent Line-Card Protection Architecture with Switches out of the Line Cards for Twisted Pair Cable (120Ω E1, or 100Ω
T1). Figure for coaxial cable (75Ω E1) is the same without the single-ended-to-differential conversion.
______________________________________________________________________________________
13
High-Bandwidth, T1/E1, SPST Analog Switches
9
COM2
13
8
COM3
IN2
14
7
IN3
COM2
13
IN2
14
NC3
10
N.C.
NO3
11
V+
N.C.
12
TOP VIEW
NC2
V+
TOP VIEW
NO2
MAX4815/MAX4816/MAX4817
Pin Configurations (continued)
12
11
10
9
4
COM4
THIN QFN (5mm x 5mm)
*EXPOSED PADDLE CONNECTED TO V-
15
COM1
16
+
*EP
1
2
3
4
NO4
3
5
IN1
GND
2
IN4
V-
1
NO4
*EP
6
NO1
+
GND
16
V-
COM1
NO1
15
COM3
7
IN3
6
IN4
5
COM4
MAX4817
MAX4816
IN1
8
THIN QFN (5mm x 5mm)
*EXPOSED PADDLE CONNECTED TO V-
Chip Information
PROCESS: BiCMOS
CONNECT EXPOSED PADDLE TO V-.
14
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
..
.
. ..
.. .
LINE CARD N
..
. ...
..
.
LINE CARD 2
LINE CARD 1
IN1
T1/E1
LIU
Tx
NO1
COM1
NO2
COM2
IN2
ZL
IN3
NO3
COM3
IN4
NO4
COM4
T1/E1
LIU
Rx
TRANSMIT
ZL
MAX4816
RECEIVE
ZL
ZL
PROTECTION LINE CARD
IN1
NO1
COM1
NO4
COM4
T1/E1
LIU
Rx
ZL
IN4
T1/E1
LIU
Rx
ZL
MAX4816
ZL = 75Ω, 100Ω, OR 120Ω
______________________________________________________________________________________
15
MAX4815/MAX4816/MAX4817
Typical Operating Circuit
High-Bandwidth, T1/E1, SPST Analog Switches
MAX4815/MAX4816/MAX4817
Functional Diagram
V+
IN1
COM1
NC1
COM2
COM3
COM2
NO2
COM4
COM3
NO3
GND
IN_ NC_
0 ON
1 OFF
16
IN2
COM2
NC2
IN3
COM3
NC3
IN4
IN4
NO4
COM4
V-
MAX4815
COM1
NO1
IN3
IN4
NC4
IN1
IN2
IN3
NC3
V+
IN1
COM1
NO1
IN2
NC2
V+
V-
MAX4816
GND
IN_ NO_
0 OFF
1 ON
NO4
COM4
V-
MAX4817
GND
IN_ NC_ NO_
0 ON OFF
1 OFF ON
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
QFN THIN.EPS
Revision History
Pages changed at Rev 2: 1, 9, 17
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2007 Maxim Integrated Products
Boblet
is a registered trademark of Maxim Integrated Products, Inc.
MAX4815/MAX4816/MAX4817
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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