MAXIM MAX3171, MAX3173 User Manual

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 inter­face 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 no­cable mode is entered when all mode pins (M0, M1,
and M2) are pulled high or left unconnected. In no­cable mode, supply current decreases to 2mA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit limiting and thermal-shut­down 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 avail­able 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

♦ Industry’s First +3.3V Multiprotocol Transceiver

♦ Certified TBR-1 and TBR-2 Compliant

(NET1 and NET2)

♦ Supports V.28 (RS-232) and V.10/V.11 (RS-449,

V.36, EIA-530, EIA-530-A, X.21, RS-423) Protocols

♦ 3V/5V Logic Compatibility
♦ 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

________________________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

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.

CTS DSR RTSDTR LLDCD

PART TEMP. RANGE PIN-PACKAGE
MAX3171CAI 0°C to +70°C 28 SSOP
MAX3173CAI 0°C to +70°C 28 SSOP

RXD RXC TXDTXC SCTE

MAX3171
MAX3173

R2R3

13 5 10 8 22 6 23 20 19 4 1 7 1618 3 9 17 12 15 11 24 14 2

CTS B

CTS A

DSR B

DSR A

D3

R1

DCD B

DCD A

D2

DTR B

DTR A

D1

RTS B

RTS A

SHIELD

MAX3172
MAX3174

R4

SG

DB-25 CONNECTOR

R2R3

D4

LL A

RXD A

RXD B

RXC B

RXC A

D3

R1

TXC B

TXC A

SCTE B

SCTE A

D1D2

TXD B

MAX3170

TXD A

MAX3171/MAX3173

+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC

= +3.3V, TA= +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

DC CHARACTERISTICS

Supply Current
(DCE Mode, Digital Inputs =
GND or V
Outputs Static)

Internal Power Dissipation P

V+ Output Voltage V+

V- Output Voltage 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

Input Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I

, Transmitter

CC

CC

D

IH

IL

IL

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

No-cable mode 2 8

V.11/V.10 modes (no load) 20

V.11/V.10 modes (full load) 450

V.28 mode (full load) 40

No-cable mode 6.6

V.11/V.10 modes (no load) 4.4

V.11/V.10 modes (full load) 4.2

V.28 mode 5.55

No-cable mode 4.6

V.11/V.10 modes (no load) -4.0

V.11/V.10 modes (full load) -3.8

V.28 mode -5.45

No-cable mode -4.2

T_IN ±1
M0, M1, M2, DCE / DTE = V
M0, M1, M2, DCE / DTE = GND 30 50 100

CC

2.0 V

0.8 V

±1Logic Input Current IIH, I

mA

mW

V

V

µA

MAX3171/MAX3173

+3.3V Multiprotocol 3Tx/3Rx

Software-Selectable Control Transceivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and TA= 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

Output Low Voltage V

Rise or Fall Time tr, t

Output Leakage Current
(Receiver Output Three-Stated)

TRANSMITTER OUTPUTS

Output Leakage Current I

Data Rate

Receiver Glitch Rejection
(MAX3171 only)

Receiver Input Resistance R

Data Rate

V.11 TRANSMITTER

Unloaded Differential Output
Voltage

Loaded Differential Output
Voltage

Change in Magnitude of Output
Differential Voltage

Common-Mode Output Voltage V

Change in Magnitude of Output
Common-Mode Voltage

Short-Circuit Current I

Rise or Fall Time tr, t

Transmitter Input to Output t

Data Skew | t

Output-to-Output Skew t

Channel-to-Channel Skew 2ns

V.11 RECEIVER

Differential Threshold Voltage V

Input Hysteresis ∆V

V

V

∆V

∆V

PHL

PHL

OH

OL

Z

IN

ODO

ODL

OD

OC

OC

SC

, t

- t

SKEW

TH

I

I

10% to 90%, Figure 4 15 ns

f

R_OUT = GND 30 50 100

R_OUT = V

-0.25V ≤ V
no-cable mode

V.28 240

V.10 115

V.11 10 Mbps

Minimum pulse width passed 5

Minimum pulse width rejected 15

-10V ≤ VAB ≤ +10V, VA or VB grounded,
V.11/V.35, no-cable mode

-15V ≤ VA ≤ +15V, V.28 mode 3 5 7

MAX3171

MAX3173

R = 1.95kΩ, Figure 1 4.0 6.0 V

R = 50Ω, Figure 1 0.5 ✕ V

R = 50Ω, Figure 1 0.2 V

R = 50Ω, Figure 1 3.0 V

R = 50Ω, Figure 1 0.2 V

T_OUTA/B = GND 60 150 mA

10% to 90%, Figure 2 10 25 ns

f

Figure 2 50 80 ns

PLH

| Figure 2 2 10 ns

PLH

Figure 2 2 ns

-7V ≤ VCM ≤ +7V -200 -100 -25 mV

-7V ≤ VCM ≤ +7V 5 15 mV

TH

= 1.0mA VCC - 1.0 V

SOURCE

= 1.6mA 0.4 V

SINK

CC

≤ +0.25V, power off or

OUT

V.10/V.28 64

V.11 64

V.10/V.28 240

V.11 10 Mbps

-100 100 µA

20 40

ODO

±1

µA

kbps

µs

KΩ

kbps

V

MAX3171/MAX3173

+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC

= +3.3V, TA= +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.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Receiver Input to Output t

Data Skew | t

PHL

P H L

, t

- t

MAX3171 5 10 15 µs

PLH

MAX3173 60 120 ns

MAX3171 0.5 4 µs

|

P LH

MAX3173 5 16 ns

V.10 TRANSMITTER

Unloaded Output Voltage

Loaded Output Voltage Swing V

Short-Circuit Current I

V

ODO

ODL

SC

Transmitter Rise or Fall Time tr, t

Transmitter Input to Output t

Data Skew | t

PHL

P H L

, t

- t

RL = 3.9kΩ, Figure 3 ±4.0 ±4.4 ±6.0 V

RL = 450Ω, Figure 3

T_OUTA = GND ±100 ±150 mA

RL = 450Ω, C

f

PLHRL

P LH

= 450Ω, C

| RL = 450Ω, C

V.10 RECEIVER

Threshold Voltage V

Input Hysteresis ∆V

Receiver Input to Output t

Data Skew | t

PHL

P H L

TH

TH

, t

- t

MAX3171, Figure 4 5 10 15 µs

PLH

MAX3173, Figure 4 60 120 ns

MAX3171, Figure 4 0.5 4 µs

|

P LH

MAX3173, Figure 4 5 16 ns

V.28 TRANSMITTER

Output Voltage Swing V

Short-Circuit Current I

O

SC

All transmitters loaded with RL = 3kΩ±5.0 ±5.4

No load ±6.5

T_OUTA = GND ±25 ±60 mA

RL = 3kΩ, CL = 2500pF, measured from +3V

Output Slew Rate SR

to -3V or from -3V to +3V, Figure 3

R

= 7kΩ, CL = 150pF, measured from +3V

L

to -3V or from -3V to +3V, Figure 3

Transmitter Input to Output t

Data Skew | t

PHL

P H L

, t

- t

Figure 3 1 µs

PLH

| Figure 3 100 ns

P LH

V.28 RECEIVER

Input Threshold Low V

Input Threshold High V

Input Hysteresis V

Propagation Delay t

Data Skew | t

PLH

P H L

IL

IH

HYS

, t

- t

MAX3171, Figure 4 5 10 15

PHL

MAX3173, Figure 4 200

MAX3171, Figure 4 0.5 4.0 µs

|

P LH

MAX3173, Figure 4 100 ns

= 100pF, Figure 3 2 µs

L

= 100pF, Figure 3 2 µs

L

=100pF, Figure 3 50 ns

L

✕

0.9
V

ODO

+25 +100 +300 mV

430

630

2.0 V

V

15 mV

V

V/µs

0.8 V

0.5 V

µs

MAX3171/MAX3173

+3.3V Multiprotocol 3Tx/3Rx

Software-Selectable Control Transceivers

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VCC= +3.3V, C1 = C2 = 1.0µF, C3 = C4 = C5 = 3.3µF, TA= +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-

RL = 3k

Ω

-5

-2

-3

-4

-1

0

1

2

3

4

5

-40 10-15 356085

V.10 LOADED OUTPUT VOLTAGE

vs. TEMPERATURE

MAX3171 toc05

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

V

OUT+

V

OUT-

RL = 450

Ω

-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 1000500 1500 2000 2500 3000

V.28 SLEW RATE

vs. LOAD CAPACITANCE

MAX3171toc11

CAPACITANCE (pF)

SLEW RATE (V/µs)

+SLEW

-SLEW

0

0.5

1.5

1.0

2.0

2.5

0 1000500 1500 2000 2500 3000

V.10 TRANSMITTER RISE AND FALL TIMES

vs. LOAD CAPACITANCE

MAX3171toc12

CAPACITANCE (pF)

RISE/FALL TIME (µs)

FALL

RISE

V.10/V.11 MODE SUPPLY CURRENT vs.

DATA RATE

250

FULL LOAD

200

150

100

SUPPLY CURRENT (mA)

50

NO LOAD

0

0.001 0.01 10k 100k0.1 1k 1000k
DATA RATE (kbps)

MAX3171 toc01

SUPPLY CURRENT (mA)

V.28 MODE SUPPLY CURRENT

vs. DATA RATE

80

70

60

50

40

30

FULL LOAD

20

NO LOAD

10

0

0.001 0.01 10k 100k0.1 1k 1000k
DATA RATE (kbps)

MAX3171 toc02

V.11 LOADED DIFFERENTIAL

OUTPUT VOLTAGE vs. TEMPERATURE

4

3

V

2

1

0

-1

OUTPUT VOLTAGE (V)

-2

-3

-4

OUT+

V

OUT-

-40 -15 10 35 60 85
TEMPERATURE (°C)

RL = 100

Ω

MAX3171 toc03