19-1703; Rev 1; 8/01
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
General Description
The MAX3171/MAX3173 are three-driver/three-receiver
multiprotocol transceivers that operate from a single
+3.3V supply. The MAX3171/MAX3173, along with the
MAX3170 and MAX3172/MAX3174, form a complete
software-selectable data terminal equipment (DTE) or
data communications equipment (DCE) interface port
that supports V.28 (RS-232) and V.10/V.11 (RS-449,
V.36, EIA-530, EIA-530-A, X.21, RS-423) protocols. The
MAX3171/MAX3173 transceivers carry the serial inter-
face control signaling; the MAX3170 transceivers carry
the clock and data signals. The MAX3172/
MAX3174 have an extra transceiver for applications
requiring four transceivers for control signaling.
An internal charge pump and proprietary low-dropout
transmitter output stage allow V.28, V.11, and V.10
compliant operation from a single +3.3V supply. A no-
cable mode is entered when all mode pins (M0, M1,
and M2) are pulled high or left unconnected. In no-
cable mode, supply current decreases to 2mA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit limiting and thermal-shut-
down circuits protect the drivers against excessive
power dissipation.
The MAX3171 features 10µs deglitching on the
V.10/V.11/V.28 receiver inputs. The MAX3173 is avail-
able for applications that do not require deglitching on
the serial handshake signals.
These parts require only four surface-mount capacitors
for charge-pump operation in addition to supply
bypassing.
CTS
DSR
DCD
DTR
RTS
LL
Features
o
Industry’s First +3.3V Multiprotocol Transceiver
o
Certified TBR-1 and TBR-2 Compliant
(NET1 and NET2)
o
Supports V.28 (RS-232) and V.10/V.11 (RS-449,
V.36, EIA-530, EIA-530-A, X.21, RS-423) Protocols
o
3V/5V Logic Compatibility
o
o
o
o
o
Software-Selectable DCE/DTE
True Fail-Safe Receiver Operation
Available in Small 28-Pin SSOP Package
10µs Receiver Input Deglitching (MAX3171 only)
All Transmitter Outputs Fault Protected to ±15V,
Tolerate Cable Miswiring
MAX3171/MAX3173
________________________Applications
Data Networking
CSU and DSU
PCI Cards
Telecommunications
Ordering Information
PART
MAX3171CAI
MAX3173CAI
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SSOP
28 SSOP
Data Routers
Pin Configuration appears at end of data sheet
Typical Operating Circuit
RXD
RXC
TXC
SCTE TXD
MAX3171
MAX3173
R3
R2
R1
D3
D2
D1
MAX3172
MAX3174
R3
R2
R1
D3
D2
D1
MAX3170
R4
D4
13 5
CTS B
CTS A
10 8
DSR B
DSR A
22 6
DCD B
DCD A
23 20 19 4
DTR B
DTR A
RTS B
RTS A
1
SHIELD
7
SG
DB-25 CONNECTOR
18
LL A
16 3
9 17
12 15 11 24 14 2
TXC B
TXC A
SCTE B
SCTE A
TXD B
TXD A
________________________________________________________________
Maxim Integrated Products
RXD B
RXD A
RXC B
RXC A
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.
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
MAX3171/MAX3173
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.)
Supply Voltages
V
CC
......................................................................-0.3V to +4V
V+ (Note 1) ..........................................................-0.3V to +7V
V- (Note 1) ...........................................................+0.3V to -7V
V+ to V- (Note 1) ...............................................................13V
Logic Input Voltages
M0, M1, M2, DCE/DTE, T_IN ...............................-0.3V to +6V
Logic Output Voltages
R_OUT ...................................................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration............................................Continuous
Transmitter Outputs
T_OUT_...............................................................-15V to +15V
Short-Circuit Duration ........................................................60s
Receiver Inputs
R_IN_ ..................................................................-15V to +15V
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 11.1mW/°C above +70°C) ........889mW
Operating Temperature Range
MAX3171CAI/MAX3173CAI ...............................0°C to +70°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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
CC
= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.) (Note 2)
PARAMETER
DC CHARACTERISTICS
V.11/V.10 modes
Supply Current
(DCE Mode, Digital Inputs =
GND or V
CC
, Transmitter
Outputs Static)
V.11/V.10 modes (no load)
I
CC
V.28 mode
V.28 mode (no load)
No-cable mode
V.11/V.10 modes (no load)
Internal Power Dissipation
P
D
V.11/V.10 modes (full load)
V.28 mode (full load)
No-cable mode
V.11/V.10 modes (no load)
V+ Output Voltage
V+
V.11/V.10 modes (full load)
V.28 mode
No-cable mode
V.11/V.10 modes (no load)
V- Output Voltage
V-
V.11/V.10 modes (full load)
V.28 mode
No-cable mode
Charge-Pump Enable Time
LOGIC INPUTS (M0, M1, M2, DCE/DTE, T_IN)
Input High Voltage
Input Low Voltage
Logic Input Current
V
IH
V
IL
T_IN
I
IH
, I
IL
M0, M1, M2, DCE /
DTE
= V
CC
M0, M1, M2, DCE /
DTE
= GND
30
50
2.0
0.8
±1
±1
100
µA
V
V
Delay until V+ and V- specifications met
-4.2
1
ms
4.4
4.2
5.55
4.6
-4.0
-3.8
-5.45
V
V
220
6
24
6
2
20
450
40
6.6
mW
300
23
40
23
8
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
PARAMETER
LOGIC OUTPUTS (R_OUT)
Output High Voltage
Output Low Voltage
Rise or Fall Time
Output Leakage Current
(Receiver Output Three-Stated)
TRANSMITTER OUTPUTS
Output Leakage Current
I
Z
-0.25V
≤
V
OUT
≤
+0.25V, power off or
no-cable mode
V.28
Data Rate
Receiver Glitch Rejection
(MAX3171 only)
Receiver Input Resistance
R
IN
V.10
V.11
Minimum pulse width passed
Minimum pulse width rejected
-10V
≤
V
AB
≤
+10V, V
A
or V
B
grounded,
V.11/V.35, no-cable mode
-15V
≤
V
A
≤
+15V, V.28 mode
MAX3171
Data Rate
MAX3173
V.11 TRANSMITTER
Unloaded Differential Output
Voltage
Loaded Differential Output
Voltage
Change in Magnitude of Output
Differential Voltage
Common-Mode Output Voltage
Change in Magnitude of Output
Common-Mode Voltage
Short-Circuit Current
Rise or Fall Time
Transmitter Input to Output
Data Skew
Output-to-Output Skew
Channel-to-Channel Skew
V.11 RECEIVER
Differential Threshold Voltage
Input Hysteresis
V
TH
∆V
TH
-7V
≤
V
CM
≤
+7V
-7V
≤
V
CM
≤
+7V
-200
5
-100
15
-25
mV
mV
V
ODO
V
ODL
∆V
OD
V
OC
∆V
OC
I
SC
t
r
, t
f
t
PHL
, t
PLH
t
SKEW
R = 1.95kΩ, Figure 1
R = 50Ω, Figure 1
R = 50Ω, Figure 1
R = 50Ω, Figure 1
R = 50Ω, Figure 1
T_OUTA/B = GND
10% to 90%, Figure 2
Figure 2
Figure 2
60
10
50
2
2
2
4.0
0.5
✕
V
ODO
0.2
3.0
0.2
150
25
80
10
6.0
V
V
V
V
V
mA
ns
ns
ns
ns
ns
V.10/V.28
V.11
V.10/V.28
V.11
20
3
40
5
64
64
240
10
Mbps
kbps
7
5
15
-100
240
115
10
100
µA
kbps
Mbps
µs
V
OH
V
OL
t
r
, t
f
I
SOURCE
= 1.0mA
I
SINK
= 1.6mA
10% to 90%, Figure 4
R_OUT = GND
R_OUT = V
CC
30
15
50
100
±1
V
CC
- 1.0
0.4
V
V
ns
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3171/MAX3173
KΩ
| t
PHL
- t
PLH
| Figure 2
_______________________________________________________________________________________
3
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
MAX3171/MAX3173
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.) (Note 2)
PARAMETER
Receiver Input to Output
Data Skew
V.10 TRANSMITTER
Unloaded Output Voltage
Loaded Output Voltage Swing
Short-Circuit Current
Transmitter Rise or Fall Time
Transmitter Input to Output
Data Skew
V.10 RECEIVER
Threshold Voltage
Input Hysteresis
Receiver Input to Output
Data Skew
V.28 TRANSMITTER
Output Voltage Swing
Short-Circuit Current
V
O
I
SC
All transmitters loaded with R
L
= 3kΩ
No load
T_OUTA = GND
R
L
= 3kΩ, C
L
= 2500pF, measured from +3V
to -3V or from -3V to +3V, Figure 3
Output Slew Rate
SR
R
L
= 7kΩ, C
L
= 150pF, measured from +3V
to -3V or from -3V to +3V, Figure 3
Transmitter Input to Output
Data Skew
V.28 RECEIVER
Input Threshold Low
Input Threshold High
Input Hysteresis
Propagation Delay
Data Skew
V
IL
V
IH
V
HYS
t
PLH
, t
PHL
| t
PHL
- t
PLH
|
MAX3171, Figure 4
MAX3173, Figure 4
MAX3171, Figure 4
MAX3173, Figure 4
0.5
100
5
2.0
0.5
10
200
4.0
15
0.8
V
V
V
µs
µs
ns
t
PHL
, t
PLH
| t
PHL
- t
PLH
|
Figure 3
Figure 3
6
1
100
30
µs
ns
4
±25
±5.0
±5.4
±6.5
±60
30
V/µs
V
mA
V
TH
∆V
TH
t
PHL
, t
PLH
| t
PHL
- t
PLH
|
MAX3171, Figure 4
MAX3173, Figure 4
MAX3171, Figure 4
MAX3173, Figure 4
5
+25
+100
15
10
60
0.5
5
15
120
4
16
+300
mV
mV
µs
ns
µs
ns
SYMBOL
t
PHL
, t
PLH
| t
PHL
- t
PLH
|
MAX3171
MAX3173
MAX3171
MAX3173
R
L
= 3.9kΩ, Figure 3
R
L
= 450Ω, Figure 3
T_OUTA = GND
R
L
= 450Ω, C
L
= 100pF, Figure 3
R
L
= 450Ω, C
L
= 100pF, Figure 3
R
L
= 450Ω, C
L
=100pF, Figure 3
±4.0
0.9
✕
V
ODO
±100
2
2
50
±150
CONDITIONS
MIN
5
TYP
10
60
0.5
5
±4.4
MAX
15
120
4
16
±6.0
UNITS
µs
ns
µs
ns
V
V
mA
µs
µs
ns
V
ODO
V
ODL
I
SC
t
r
, t
f
t
PHL
, t
PLH
| t
PHL
- t
PLH
|
Note 2:
V+ and V- are also used to supply the MAX3172/MAX3174. The MAX3171/MAX3173 are tested with additional current load
on V+ and V- to capture the effect of loading from the MAX3172/MAX3174 in all operation modes.
4
_______________________________________________________________________________________
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
Typical Operating Characteristics
(V
CC
= +3.3V, C1 = C2 = 1.0µF, C3 = C4 = C5 = 3.3µF, T
A
= +25°C, unless otherwise noted.)
V.10/V.11 MODE SUPPLY CURRENT vs.
DATA RATE
MAX3171 toc01
MAX3171/MAX3173
V.28 MODE SUPPLY CURRENT
vs. DATA RATE
MAX3171 toc02
V.11 LOADED DIFFERENTIAL
OUTPUT VOLTAGE vs. TEMPERATURE
R
L
= 100Ω
V
OUT+
3
OUTPUT VOLTAGE (V)
2
1
0
-1
-2
V
OUT-
MAX3171 toc03
250
FULL LOAD
200
SUPPLY CURRENT (mA)
80
70
SUPPLY CURRENT (mA)
60
50
40
30
20
FULL LOAD
4
150
100
50
NO LOAD
10
NO LOAD
-3
-4
0.01
0.1
1k
10k
100k
1000k
-40
0
0.001
0.01
0.1
1k
10k
100k
1000k
0
0.001
-15
10
35
60
85
DATA RATE (kbps)
DATA RATE (kbps)
TEMPERATURE (°C)
V.28 LOADED OUTPUT VOLTAGE
vs. TEMPERATURE
R
L
= 3kΩ
6
V
OUT+
OUTPUT VOLTAGE (V)
4
2
0
-2
-4
-6
-8
-40
-15
10
35
60
85
TEMPERATURE (°C)
V
OUT-
MAX3171 toc04
V.10 LOADED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX3171 toc05
V.10/V.11 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3171 toc06
8
5
4
3
OUTPUT VOLTAGE (V)
2
1
0
-1
-2
-3
-4
-5
-40
-15
10
35
60
V
OUT-
V
OUT+
R
L
= 450Ω
0.3
0.2
INPUT CURRENT (mA)
0.1
0
-0.1
-0.2
-0.3
85
-10
-5
0
INPUT VOLTAGE (V)
5
10
TEMPERATURE (°C)
V.28 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3171 toc07
V.28 SLEW RATE
vs. LOAD CAPACITANCE
16
14
12
10
8
6
4
2
0
0
0
500
1000
1500
2000
2500
3000
-SLEW
+SLEW
RISE/FALL TIME (µs)
SLEW RATE (V/µs)
MAX3171toc11
V.10 TRANSMITTER RISE AND FALL TIMES
vs. LOAD CAPACITANCE
MAX3171toc12
4
3
INPUT CURRENT (mA)
2
1
0
-1
-2
-3
-4
-15
-10
-5
0
5
10
18
2.5
2.0
FALL
1.5
RISE
1.0
0.5
15
0
500
1000
1500
2000
2500
3000
INPUT VOLTAGE (V)
CAPACITANCE (pF)
CAPACITANCE (pF)
_______________________________________________________________________________________
5
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