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.
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 Software-Selectable DCE/DTE
o True Fail-Safe Receiver Operation
o Available in Small 28-Pin SSOP Package
o 10µs Receiver Input Deglitching (MAX3171 only)
o All Transmitter Outputs Fault Protected to ±15V,
Tolerate Cable Miswiring
________________________Applications
Data Networking
PCI Cards
CSU and DSU
Telecommunications
Data Routers
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
________________________________________________________________ Maxim Integrated Products
1
19-1703; Rev 1; 8/01
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX3171CAI
0
°C to +70°C
28 SSOP
MAX3173CAI
0
°C to +70°C
28 SSOP
D1
D2
D3
R1
R2
R3
MAX3170
RXD
RXC
TXD
TXC
SCTE
D1
R4
D4
D2
D3
R1
R2
R3
MAX3171
MAX3173
MAX3172
MAX3174
CTS
DSR
RTS
DTR
LL
DCD
CTS B
CTS A
DSR B
DSR A
DCD B
DCD A
DTR B
DTR A
RTS B
RTS A
SHIELD
SG
LL A
RXD A
RXD B
RXC B
RXC A
TXC B
TXC A
SCTE B
SCTE A
TXD B
TXD A
DB-25 CONNECTOR
13 5
10 8
22 6
23 20 19 4
1
7
16
18
3
9 17
12 15 11 24 14 2
Typical Operating Circuit
Pin Configuration appears at end of data sheet
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.
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
(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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
V.11/V.10 modes
220
300
V.11/V.10 modes (no load)
6
23
V.28 mode
24
40
V.28 mode (no load)
6
23
Supply Current
(DCE Mode, Digital Inputs =
GND or V
CC
, Transmitter
Outputs Static)
I
CC
No-cable mode
2
8
mA
V.11/V.10 modes (no load)
20
V.11/V.10 modes (full load)
450
V.28 mode (full load)
40
Internal Power Dissipation
P
D
No-cable mode
6.6
mW
V.11/V.10 modes (no load)
4.4
V.11/V.10 modes (full load)
4.2
V.28 mode
5.55
V+ Output Voltage
V+
No-cable mode
4.6
V
V.11/V.10 modes (no load)
-4.0
V.11/V.10 modes (full load)
-3.8
V.28 mode
-5.45
V- Output Voltage
V-
No-cable mode
-4.2
V
Charge-Pump Enable Time
Delay until V+ and V- specifications met
1
ms
LOGIC INPUTS (M0, M1, M2, DCE/
DTE, T_IN)
Input High Voltage
V
IH
2.0
V
Input Low Voltage
V
IL
0.8
V
T_IN
±1
M0, M1, M2, DCE /
DTE = V
CC
±1
Logic Input Current
I
IH
, I
IL
M0, M1, M2, DCE /
DTE = GND
30
50
100
µA
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
_______________________________________________________________________________________
3
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC OUTPUTS (R_OUT)
Output High Voltage
V
OH
I
SOURCE
= 1.0mA
V
CC
- 1.0
V
Output Low Voltage
V
OL
I
SINK
= 1.6mA
0.4
V
Rise or Fall Time
t
r
, t
f
10% to 90%, Figure 4
15
ns
R_OUT = GND
30
50
100
Output Leakage Current
(Receiver Output Three-Stated)
R_OUT = V
CC
±1
µA
TRANSMITTER OUTPUTS
Output Leakage Current
I
Z
-0.25V
V
OUT
+0.25V, power off or
no-cable mode
-100
100
µA
V.28
240
V.10
115
kbps
Data Rate
V.11
10
Mbps
Minimum pulse width passed
5
Receiver Glitch Rejection
(MAX3171 only)
Minimum pulse width rejected
15
µs
-10V
V
AB
+10V, V
A
or V
B
grounded,
V.11/V.35, no-cable mode
20
40
Receiver Input Resistance
R
IN
-15V
V
A
+15V, V.28 mode
3
5
7
K
V.10/V.28
64
MAX3171
V.11
64
V.10/V.28
240
kbps
Data Rate
MAX3173
V.11
10
Mbps
V.11 TRANSMITTER
Unloaded Differential Output
Voltage
V
ODO
R = 1.95k
, Figure 1
4.0
6.0
V
Loaded Differential Output
Voltage
V
ODL
R = 50
, Figure 1
0.5
V
ODO
V
Change in Magnitude of Output
Differential Voltage
V
OD
R = 50
, Figure 1
0.2
V
Common-Mode Output Voltage
V
OC
R = 50
, Figure 1
3.0
V
Change in Magnitude of Output
Common-Mode Voltage
V
OC
R = 50
, Figure 1
0.2
V
Short-Circuit Current
I
SC
T_OUTA/B = GND
60
150
mA
Rise or Fall Time
t
r
, t
f
10% to 90%, Figure 2
10
25
ns
Transmitter Input to Output
t
PHL
, t
PLH
Figure 2
50
80
ns
Data Skew
| t
PHL
- t
PLH
| Figure 2
2
10
ns
Output-to-Output Skew
t
SKEW
Figure 2
2
ns
Channel-to-Channel Skew
2
ns
V.11 RECEIVER
Differential Threshold Voltage
V
TH
-7V
V
CM
+7V
-200
-100
-25
mV
Input Hysteresis
V
TH
-7V
V
CM
+7V
5
15
mV
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3171
5
10
15
µs
Receiver Input to Output
t
PHL
, t
PLH
MAX3173
60
120
ns
MAX3171
0.5
4
µs
Data Skew
| t
P H L
- t
P LH
|
MAX3173
5
16
ns
V.10 TRANSMITTER
Unloaded Output Voltage
V
ODO
R
L
= 3.9k
, Figure 3
±4.0
±4.4
±6.0
V
Loaded Output Voltage Swing
V
ODL
R
L
= 450
, Figure 3
0.9
V
ODO
V
Short-Circuit Current
I
SC
T_OUTA = GND
±100
±150
mA
Transmitter Rise or Fall Time
t
r
, t
f
R
L
= 450
, C
L
= 100pF, Figure 3
2
µs
Transmitter Input to Output
t
PHL
, t
PLH
R
L
= 450
, C
L
= 100pF, Figure 3
2
µs
Data Skew
| t
P H L
- t
P LH
| R
L
= 450
, C
L
=100pF, Figure 3
50
ns
V.10 RECEIVER
Threshold Voltage
V
TH
+25
+100
+300
mV
Input Hysteresis
V
TH
15
mV
MAX3171, Figure 4
5
10
15
µs
Receiver Input to Output
t
PHL
, t
PLH
MAX3173, Figure 4
60
120
ns
MAX3171, Figure 4
0.5
4
µs
Data Skew
| t
P H L
- t
P LH
|
MAX3173, Figure 4
5
16
ns
V.28 TRANSMITTER
All transmitters loaded with R
L
= 3k
±5.0
±5.4
Output Voltage Swing
V
O
No load
±6.5
V
Short-Circuit Current
I
SC
T_OUTA = GND
±25
±60
mA
R
L
= 3k
, C
L
= 2500pF, measured from +3V
to -3V or from -3V to +3V, Figure 3
4
30
Output Slew Rate
SR
R
L
= 7k
, C
L
= 150pF, measured from +3V
to -3V or from -3V to +3V, Figure 3
6
30
V/µs
Transmitter Input to Output
t
PHL
, t
PLH
Figure 3
1
µs
Data Skew
| t
P H L
- t
P LH
| Figure 3
100
ns
V.28 RECEIVER
Input Threshold Low
V
IL
0.8
V
Input Threshold High
V
IH
2.0
V
Input Hysteresis
V
HYS
0.5
V
MAX3171, Figure 4
5
10
15
Propagation Delay
t
PLH
, t
PHL
MAX3173, Figure 4
200
µs
MAX3171, Figure 4
0.5
4.0
µs
Data Skew
| t
P H L
- t
P LH
|
MAX3173, Figure 4
100
ns
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)
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.
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
_______________________________________________________________________________________
5
0
50
150
100
200
250
V.10/V.11 MODE SUPPLY CURRENT vs.
DATA RATE
MAX3171 toc01
DATA RATE (kbps)
SUPPLY CURRENT (mA)
0.001
0.01
10k
100k
0.1
1k
1000k
NO LOAD
FULL LOAD
0
10
40
30
20
60
50
80
70
V.28 MODE SUPPLY CURRENT
vs. DATA RATE
MAX3171 toc02
DATA RATE (kbps)
SUPPLY CURRENT (mA)
0.001
0.01
10k
100k
0.1
1k
1000k
FULL LOAD
NO LOAD
-4
-3
-2
-1
0
1
2
3
4
-40
-15
10
35
60
85
V.11 LOADED DIFFERENTIAL
OUTPUT VOLTAGE vs. TEMPERATURE
MAX3171 toc03
TEMPERATURE (
°C)
OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
R
L
= 100
Typical Operating Characteristics
(V
CC
= +3.3V, C1 = C2 = 1.0µF, C3 = C4 = C5 = 3.3µF, T
A
= +25°C, unless otherwise noted.)
-8
-6
-4
-2
0
2
4
6
8
-40
-15
10
35
60
85
V.28 LOADED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX3171 toc04
TEMPERATURE (
°C)
OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
R
L
= 3k
-5
-2
-3
-4
-1
0
1
2
3
4
5
-40
10
-15
35
60
85
V.10 LOADED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX3171 toc05
TEMPERATURE (
°C)
OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
R
L
= 450
-0.3
-0.1
-0.2
0.1
0
0.2
0.3
-10
0
-5
5
10
V.10/V.11 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3171 toc06
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
-4
-3
-2
-1
0
1
2
3
4
-15
-5
-10
0
5
10
15
V.28 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3171 toc07
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
0
4
2
10
8
6
16
14
12
18
0
1000
500
1500
2000
2500
3000
V.28 SLEW RATE
vs. LOAD CAPACITANCE
MAX3171toc11
CAPACITANCE (pF)
SLEW RATE (V/
µ
s)
+SLEW
-SLEW
0
0.5
1.5
1.0
2.0
2.5
0
1000
500
1500
2000
2500
3000
V.10 TRANSMITTER RISE AND FALL TIMES
vs. LOAD CAPACITANCE
MAX3171toc12
CAPACITANCE (pF)
RISE/FALL TIME (
µ
s)
FALL
RISE
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