19-3330; Rev 0; 4/00
+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-
Selectable Clock/Data Transceiver
General Description
The MAX3170 is a three-driver/three-receiver multipro-
tocol transceiver that operates from a +3.3V single sup-
ply. The MAX3170, along with the MAX3171/MAX3173
and MAX3172/MAX3174, form a complete software-
selectable data terminal equipment (DTE) or data com-
munications equipment (DCE) interface port that
supports the V.28 (RS-232), V.11 (RS-449/V.36, EIA530,
EIA530-A, X.21), and V.35 protocols. The MAX3170
transceiver carries the high-speed clock and data sig-
nals, while the MAX3171 or MAX3173 carries the con-
trol signals. The MAX3170 can be terminated by the
MAX3172 or MAX3174 software-selectable resistor ter-
mination network or by a discrete termination network.
An internal charge pump and proprietary low-dropout
transmitter output stage allow V.11-, V.28-, and V.35-
compliant operation from a +3.3V single 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 1mA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit limiting and thermal shut-
down circuitry protect the drivers against excessive
power dissipation.
o
3V/5V Logic-Compatible I/O
o
Certified TBR-1 and TBR-2 Compliant (NET1 and
NET2)—Pending Completion
o
Supports V.28 (RS-232), V.11 (RS-449/V.36,
EIA530, EIA530-A, X.21), and V.35 Protocols
o
Software-Selectable DTE/DCE
o
Complete DTE/DCE Port with MAX3171/MAX3173
and MAX3172/MAX3174
o
True Fail-Safe Receiver Operation
o
Available in Small 28-Pin SSOP Package
o
10Mbps Operation (V.11/V.35)
o
Requires Only Four Tiny Surface-Mount
Capacitors
o
All Transmitter Outputs Are Fault Protected to
±15V to Survive Cable Miswiring
Features
o
Industry’s First +3.3V Single-Supply Transceiver
MAX3170
________________________Applications
Data Networking
CSU and DSU
Data Routers
PCI Cards
Telecommunications
PART
MAX3170CAI
Ordering Information
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
28 SSOP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
CTS
DSR
DCD
DTR
RTS
LL
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 free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-
Selectable Clock/Data Transceiver
MAX3170
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
MAX3170CAI .....................................................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 = 3.3µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C
and V
CC
= +3.3V.)
PARAMETER
DC CHARACTERISTICS
V.11 mode
V.11 mode with no load
Supply Current (DCE Mode)
(Digital Inputs = GND or V
CC
)
(All Outputs Static)
V.35 mode
I
CC
V.35 mode with no load
V.28 mode
V.28 mode with no load
No-cable mode
V.11 mode, full load
Internal Power Dissipation
(DCE Mode)
P
D
V.35 mode, full load
V.28 mode, full load
V.11 mode
V+ Output Voltage (DCE Mode)
(Full Load)
V+
V.35 mode
V.28 mode
No-cable mode
V.11 mode
V- Output Voltage (DCE Mode)
(Full Load)
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
I
IN
I
IH
I
IL
T_IN
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
V-
V.35 mode
V.28 mode
No-cable mode
Delay until V+ and V- specifications met
-4.25
1
ms
4
4.25
5.55
5
-4.1
-3.7
-5.45
V
V
190
3
160
20
10
4
0.8
410
510
15
mW
250
7
210
40
20
7
2
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-
Selectable Clock/Data Transceiver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V ±5%, C1 = C2 = 1µF, C3 = C4 = 3.3µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C
and V
CC
= +3.3V.)
PARAMETER
LOGIC OUTPUTS (R_OUT)
Output High Voltage
Output Low Voltage
Rise or Fall Time
Output Leakage Current
(Receiver Output Tristated)
TRANSMITTER OUTPUTS
Output Leakage Current
Data Rate
RECEIVER INPUTS
Receiver Input Resistance
R
IN
-10V < V
A,B
< +10V, V
A
or V
B
grounded
(V.11/V.35/no-cable mode)
-15V < V
A
< +15V (V.28 mode)
Data Rate
V.11 TRANSMITTER
Unloaded Differential Output
Voltage
Loaded Differential Output
Voltage
Change in Magnitude of Output
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 Output
V.11 RECEIVER
Differential Threshold Voltage
Input Hysteresis
Receiver Input to Output
Data Skew
V
TH
∆V
TH
t
PHL
, t
PLH
|t
PHL
- t
PLH
|
-7V < V
CM
< +7V
-7V < V
CM
< +7V
V
CM
= 0, Figure 2
V
CM
= 0, Figure 2
-200
-100
15
60
5
120
16
-25
mV
mV
ns
ns
V
ODO
R = 1.95kΩ, Figure 1
4.0
2.0
0.5 x V
ODO
0.2
3.0
0.2
60
10
50
2
2
2
150
25
80
10
6.0
V
V.11/ V.35 mode
V.28 mode
20
3
40
5
10
240
7
Mbps
kbps
kΩ
I
Z
-0.25V < V
OUT
< +0.25V power-off or
no-cable mode
V.11/ V.35 mode
V.28 mode
10
240
±100
µA
Mbps
kbps
V
OH
V
OL
t
r
, t
f
I
SOURCE
= 1.0mA
I
SINK
= 1.6mA
10% to 90%
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
MAX3170
V
ODL
∆V
OD
V
OC
∆V
OC
I
SC
t
r
, t
f
t
PHL
, t
PLH
|t
PHL
- t
PLH
|
t
SKEW
R = 50Ω, Figure 1
R = 50Ω, Figure 1
R = 50Ω, Figure 1
R = 50Ω, Figure 1
V
OUT
= GND
10% to 90%, Figure 2
Figure 2
Figure 2
Figure 2
V
V
V
V
mA
ns
ns
ns
ns
ns
_______________________________________________________________________________________
3
+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-
Selectable Clock/Data Transceiver
MAX3170
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V ±5%, C1 = C2 = 1µF, C3 = C4 = 3.3µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C
and V
CC
= +3.3V.)
PARAMETER
V.35 TRANSMITTER
Differential Output Voltage
Output High Current
Output Low Current
Rise or Fall Time
Transmitter Input to Output
Data Skew
Output-to-Output Skew
Channel-to-Channel Output Skew
V.35 RECEIVER
Differential Input Voltage
Input Hysteresis
Receiver Input to Output
Data Skew
V.28 TRANSMITTER
Output Voltage Swing
Short-Circuit Current
V
O
I
SC
R
L
= 3kΩ, C
L
= 2500pF, measured from
+3V to -3V or -3V to +3V, Figure 4
Output Slew Rate
SR
R
L
= 7kΩ, C
L
= 150pF, measured from
+3V to -3V or -3V to +3V, Figure 4
Transmitter Input to Output
Data Skew
V.28 RECEIVER
Input Threshold Low
Input Threshold High
Input Hysteresis
Data Skew
V
IL
V
IH
V
HYS
|t
PHL
- t
PLH
|
Figure 5
Figure 5
Figure 5
0.8
1.1
1.6
0.5
100
2.0
V
V
V
ns
t
PHL
, t
PLH
|t
PHL
- t
PLH
|
Figure 4
Figure 4
6
1
100
30
µs
ns
4
All transmitters loaded with R
L
= 3kΩ
No load
±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
|
-4V < V
CM
< +4V, Figure 3
-4V < V
CM
< +4V, Figure 3
V
CM
= 0
V
CM
= 0
-200
-100
15
70
5
120
16
-25
mV
mV
ns
ns
I
OH
I
OL
t
r
, t
f
t
PHL
, t
PLH
|t
PHL
- t
PLH
|
-4V < V
CM
< +4V, Figure 3
V
A, B
= 0
V
A, B
= 0
10% to 90%, Figure 3
Figure 3
Figure 3
Figure 3
0.44
9
-13
0.55
11
-11
10
50
5
2
2
80
10
0.66
13
-9
V
mA
mA
ns
ns
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-
Selectable Clock/Data Transceiver
Typical Operating Characteristics
(V
CC
= +3.3V, C1 = C2 = 1.0µF, C3 = C4 = 3.3µF, T
A
= +25°C, unless otherwise noted.)
V.11 SUPPLY CURRENT
vs. DATA RATE
MAX3170-01
MAX3170
V.28 SUPPLY CURRENT
vs. DATA RATE
MAX3170-02
V.35 SUPPLY CURRENT
vs. DATA RATE
DCE MODE, V
CM
= 0
ALL TRANSMITTERS OPERATING
AT SPECIFIED RATE
MAX3170-03
250
V.11 SUPPLY CURRENT (mA)
V.28 SUPPLY CURRENT (mA)
V.35 SUPPLY CURRENT (mA)
200
DCE MODE, R = 50Ω
ALL TRANSMITTERS OPERATING
AT SPECIFIED RATE
100
80
DCE MODE, ALL TRANSMITTERS
OPERATING AT THE SPECIFIED DATA RATE
R
L
= 3kΩ, C
L
= 2000pF
200
150
150
60
100
100
40
50
20
50
0
0.1
1
10
100
1000
10,000
DATA RATE (kbps)
0
0
50
100
150
200
250
DATA RATE (kbps)
0
0.1
1
10
100
1000
10,000
DATA RATE (kbps)
V.11 DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs. TEMPERATURE
MAX3170-04
V.28 OUTPUT VOLTAGE
vs. TEMPERATURE
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
DCE MODE, R = 3kΩ
VOUT+
MAX3170-05
V.35 DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
DIFFERENTIAL OUTPUT VOLTAGE (V)
DCE MODE, V
CM
= 0
V
OH
MAX3170-06
4
DRIVER DIFFERENTIAL OUTPUT VOLTAGE (V)
3
2
1
0
-1
-2
DCE MODE, R = 50Ω
V
OH
0.66
0.44
0.22
0
-0.22
-0.44
-0.66
OUTPUT VOLTAGE (V)
V
OL
-3
-4
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
VOUT-
V
OL
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
V.35 DIFFERENTIAL OUTPUT VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX3170-07
V.11/V.35 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3170-08
V.28 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
2.0
RECEIVER INPUT CURRENT (mA)
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
DCE MODE
MAX3170-09
570
DIFFERENTIAL OUTPUT VOLTAGE (V)
300
RECEIVER INPUT CURRENT (µA)
200
100
0
-100
-200
-300
2.5
DCE MODE
560
V
OH
550
540
530
520
-4
-3
-2
-1
0
V
CM
(V)
1
2
3
4
-2.5
-10 -8
-6
-4
-2
0
2
4
6
8
10
-10 -8
-6
-4
-2
0
2
4
6
8
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
5
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