MAXIM MAX3172, MAX3174 User Manual

General Description

The MAX3172/MAX3174 contain five software-selec­table multiprotocol cable termination networks. Each
network is capable of terminating V.11 (RS-422, RS­530, RS-530A, RS-449, V.36, and X.21) with a 100Ω dif­ferential load, V.35 with a T-network load, or V.28
(RS-232) and V.10 (RS-423) with an open circuit load
for use with transceivers having on-chip termination.
The devices replace discrete resistor termination net­works and expensive relays required for multiprotocol
termination. The MAX3172/MAX3174, along with the
MAX3170 and MAX3171/MAX3173, form a complete
+3.3V software-selectable DTE or DCE interface port
supporting V.11/RS-422, RS-530, RS-530A, V.36/RS­449, V.35, V.28/RS-232, V.10/RS-423, and X.21 serial
interfaces.

In addition to the five multiprotocol cable termination
networks, the MAX3172/MAX3174 contain a 1Tx/1Rx
multiprotocol transceiver designed to use V+ and V­generated by the MAX3171/MAX3173 charge pump.
The MAX3172/MAX3174 transceiver is software selec­table between V.10 and V.28 modes of operation. The
MAX3172 features 10µs deglitching on the V.10/V.28
receiver input to facilitate unterminated operation, while
the MAX3174 is used in applications that do not require
deglitching on the serial handshake signals. These
devices are available in a 28-pin SSOP package.

________________________Applications

Data Networking PCI Cards
CSU and DSU Telecommunications
Data Routers

Features

♦ Industry’s First +3.3V Multiprotocol Termination

Networks and Transceivers

♦ Certified TBR-1 and TBR-2 Compliant

(NET1 and NET2)

♦ Support V.28 (RS-232), V.11 (RS-422, RS-530, RS-

530A, RS-449, V.36, and X.21), V.10 and V.35

♦ 3V/5V Logic-Compatible I/O
♦ Software-Selectable DTE/DCE
♦ Replace Discrete Resistor Termination Networks

and Expensive Relays

♦ 10µs Receiver Input Deglitching (MAX3172 only)
♦ Available in Small 28-Pin SSOP Package
♦ Transmitter Output Fault Protected to ±15V,

Tolerates Cable Miswiring

MAX3172/MAX3174

+3.3V Multiprotocol Software-Selectable

Cable Terminators and Transceivers

________________________________________________________________ Maxim Integrated Products 1

19-1801; Rev 2; 6/04

Ordering Information

Typical Operating Circuit

Pin Configuration appears at end of data sheet.

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX3172CAI 0°C to +70°C 28 SSOP

MAX3172EAI -40°C to +85°C 28 SSOP

MAX3174CAI 0°C to +70°C 28 SSOP

CTS DSR RTSDTR LLDCD

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

SG

DB-25 CONNECTOR

RXD RXC TXDTXC SCTE

D3

R1

R2R3

R4

D4

LL A

RXD B

RXD A

RXC B

RXC A

TXC B

TXC A

SCTE B

SCTE A

D1D2

TXD B

MAX3170

TXD A

MAX3172/MAX3174

+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.3V ± 5%, TA= T

MIN

to T

MAX

. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted. See Note 2 for V+

and V- input voltage conditions.)

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, INVERT, T4IN ................-0.3V to +6V

Logic Output Voltages

R4OUT...................................................-0.3V to (V

CC

+ 0.3V)

Short-Circuit Duration............................................Continuous

Transmitter Outputs

T4OUT ................................................................-15V to +15V

Short-Circuit Duration ........................................................60s

Receiver Input

R4INA .................................................................-15V to +15V

Termination Network Inputs (applied individually)

R_A, R_B ............................................................-15V to +15V

Continuous Power Dissipation (T

A

= +70°C)

28-Pin SSOP (derate 9.52mW/°C above +70°C) ........762mW

Operating Temperature Range

MAX3172CAI/MAX3174CAI...............................0°C to +70°C

MAX3172EAI...................................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC CHARACTERISTICS

Supply Current
(Digital Inputs = GND or V

V+ Supply Current
(T4IN = GND)

V- Supply Current
(T4IN = V

TERMINATOR NETWORKS (R_A, R_B)
Differential-Mode Impedance

V.35 Mode
Common-Mode Impedance

V.35 Mode
Differential-Mode Impedance

V.11 Mode

Network OFF Impedance I

LOGIC INPUTS (M0, M1, M2, INVERT, DCE/DTE, T4IN)
Input High Voltage V
Input Low Voltage V
Logic Input Current IIH, I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

)

CC

CC

I

I

CC

V+

I

V-

Z

IH
IL

)

All modes V.10 receiver inactive 80 200
All modes V.10 receiver active 400 750
No-cable mode
V.10/V.11/V.28/V.35 modes unloaded 0.5 2.5
V.10/V.11 modes T4OUT loaded 11.0 14.0
V.28/V.35 modes T4OUT loaded 3.0 5.0
No-cable mode -0.4 -1.0
V.10/V.11/V.28/V.35 modes unloaded -0.8 -2.5

V.10/V.11 modes T4OUT loaded -11.0 -14.0
V.28/V.35 modes T4OUT loaded -3.0 -5.0

Figure 1, -2V ≤ V

Figure 2, -2V ≤ V

Figure 1, -7V ≤ V

Switches open, -15V ≤ VA ≤ +15V, V

= GND or V

V

B

VIN = VCC or GND ±1 µA

IL

0.2 1.0

≤ +2V 90 104 110 Ω

CM

≤ +2V 135 153 165 Ω

CM

≤ +7V 100 104 110 Ω

CM

= VA,

B

floating

B

50 150 kΩ

2.0 V

0.8 V

µA

mA

mA

MAX3172/MAX3174

+3.3V Multiprotocol Software-Selectable

Cable Terminators and Transceivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.3V ± 5%, TA= T

MIN

to T

MAX

. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted. See Note 2 for V+

and V- input voltage conditions.)

LOGIC OUTPUT (R4OUT)
Output High Voltage V
Output Low Voltage V
Rise or Fall Time tr, t

Output Leakage Current
(Receiver Output Three-Stated)

TRANSMITTER OUTPUT (T4OUT)

Output Leakage Current I

Data Rate V.10/V.28 240 kbps
RECEIVER INPUT (R4INA)

Receiver Glitch Rejection
(MAX3172 only)

Receiver Input Resistance R

Data Rate

V.10 TRANSMITTER

Output Voltage Swing V
Loaded Output Voltage Swing V
Short-Circuit Current I

Rise or Fall Time tr, t

Transmitter Propagation Delay t

Data Skew

V.10 RECEIVER

Threshold Voltage V
Input Hysteresis ∆V

Receiver Propagation Delay t

Data Skew

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PHL

| t

PHL

| t

ODO

PHL

t

PLH

PHL

t

PLH

OH
OL

Z

IN

ODL

SC

, t

TH

TH

, t

I
I
10% to 90%, CL = 15pF 15 ns

f

R4OUT = GND 30 50 100
R4OUT = V

-0.25V < V
power-off or no-cable mode

Minimum pulse width passed 5
Maximum pulse width rejected 15
V.10 enabled, -10V ≤ V
V.28 enabled, -15V ≤ V
MAX3172 64
MAX3174 240

RL = 3.9kΩ, Figure 3 ±4.0 ±4.4 ±6.0 V
RL = 450Ω, Figure 3 0.9 × V
T4OUT = GND ±100 ±150 mA

10% to 90%, RL = 450Ω, CL = 100pF,

f

Figure 3

PLHRL

­R

|

Figure 4

PLH

­Figure 4

|

= 1.0mA V

SOURCE

= 1.6mA 0.4 V

SINK

CC

< +0.25V,

T4OUT

≤ +10V 20 40

R4INA

≤ +15V 3 5 7

R4INA

= 450Ω, CL = 100pF, Figure 3 2 µs

= 450Ω, CL = 100pF, Figure 3 50 ns

L

MAX3172 5 10 15 µs
MAX3174 60 120 ns
MAX3172CAI 0.5 4
MAX3172EAI 0.5 5
MAX3174 5 16 ns

- 1.0 V

CC

0.1 1

-100 100 µA

ODO

2µs

25 100 250 mV

15 mV

µA

µs

kΩ

kbps

V

µs

MAX3172/MAX3174

+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.3V ± 5%, TA= T

MIN

to T

MAX

. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted. See Note 2 for V+

and V- input voltage conditions.)

Note 2: The charge pump on the MAX3171/MAX3173 can supply V+ and V- to the MAX3172/MAX3174. The V+ and V- input levels

vary with the mode of chipset operation as follows:
V.35/V.28 modes: +5.55V ≤ V+ ≤ +6.50V, -6.50V ≤ V- ≤ -5.45V

Typical operation: V+ = +5.90V, V- = -5.80V
V.10/V.11 modes: +4.20V ≤ V+ ≤ +5.0V, -4.60V ≤ V- ≤ -3.80V

Typical operation: V+ = +4.60V, V- = -4.20V
The MAX3171/MAX3173 are guaranteed to provide these V+/V- supply levels.

V.28 TRANSMITTER

Output Voltage Swing V

Short-Circuit Current I

Output Slew Rate SR

Transmitter Propagation Delay t

Data Skew

V.28 RECEIVER

Input Threshold Low V
Input Threshold High V
Input Hysteresis V

Receiver Propagation Delay t

Data Skew

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RL = 3kΩ, Figure 3 ±5.0 ±5.4

O

Open circuit, Figure 3 ±6.5
T4OUT = GND ±25 ±60 mA
RL = 3kΩ,

C

= 2500pF

L

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

R

= 7kΩ , CL = 150pF measured from

L

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

PLH

-

|

Figure 4

PLH

­Figure 4

|

MAX3172CAI
MAX3174CAI

MAX3172EAI 3 30

MAX3172 5 10 15 µs
MAX3174 200 ns
MAX3172CAI 0.5 4
MAX3172EAI 0.5 5
MAX3174 100 ns

430

630

2.0 1.6 V

PHL

| t

PHL

| t

t

PLH

t

PLH

SC

, t

PHL

IL
IH

HYS

, t

PHL

V

V/µs

1µs

100 ns

1.1 0.8 V

0.5 V

µs

MAX3172/MAX3174

+3.3V Multiprotocol Software-Selectable

Cable Terminators and Transceivers

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(V

CC

= +3.3V (see Note 2 in Electrical Characteristics table), TA= +25°C, unless otherwise noted.)

V.10 60kbps TRANSMITTER

WAVEFORM (450Ω/100pF)

MAX3172-04

10µs/div

0

5V

0

5V

-5V

5V/div

T4OUT

5V/div

T4IN

100

102
101

104
103

106
105

107

109
108

110

-10 10 20 3004050607080

V.11/V.35 DIFFERENTIAL-MODE

IMPEDANCE vs. TEMPERATURE

MAX3172-05

TEMPERATURE (°C)

DIFFERENTIAL-MODE IMPEDANCE (Ω)

VCM = -7V

VCM = 0

VCM = +7V

100

103
102
101

105
104

109
108
107
106

110

-7 -5 -3 -1 1357

V.11/V.35 DIFFERENTIAL-MODE

IMPEDANCE vs. COMMON-MODE VOLTAGE

MAX3172-06

COMMON-MODE VOLTAGE (V)

DIFFERENTIAL-MODE IMPEDANCE (Ω)

V.28 SLEW RATE

vs. LOAD CAPACITANCE

24
22
20
18
16
14
12
10

SLEW RATE (V/µs)

8
6
4
2

0

+SLEW

-SLEW

500

0

1000 1500

LOAD CAPACITANCE (pF)

2000

RL = 3kΩ

2500

MAX3172-01

3000

V.10 RISE AND FALL TIMES

vs. LOAD CAPACITANCE

2.5

FALL TIME

2.0

1.5

RISE TIME

1.0

MAX3172-03

WAVEFORM (3kΩ/1000pF LOAD)

5V

0

5V

0

-5V

V.28 60kbps TRANSMITTER

10µs/div

MAX3172-02

T4IN
5V/div

T4OUT
5V/div

RISE AND FALL TIMES (µs)

0.5

0

RL = 450Ω

0 1000500 1500 2000 2500 3000

LOAD CAPACITANCE (pF)

MAX3172/MAX3174

+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V

CC

= +3.3V (see Note 2 in Electrical Characteristics table), TA= +25°C, unless otherwise noted.)

105.0

V.11/V.35 DIFFERENTIAL-MODE

IMPEDANCE vs. V+

V.11/V.35 DIFFERENTIAL-MODE

IMPEDANCE vs. V-

105.0

104.5

104.0

103.5

DIFFERENTIAL-MODE IMPEDANCE (Ω)

103.0

4.2 4.84.4 4.6 5.0 5.2 5.4
V+ (V)

V.35 COMMON-MODE IMPEDANCE

154

153

152

151

150

149

COMMON-MODE IMPEDANCE (Ω)

148

147

-10 10 200304050607080

vs. TEMPERATURE

VCM = 2.0V

VCM = 0

VCM = -2.0V

TEMPERATURE (°C)

MAX3172-07

MAX3172-09

104.5

104.0

103.5

DIFFERENTIAL-MODE IMPEDANCE (Ω)

103.0

-5.4 -4.4-4.6-5.0-5.2 -4.8 -4.2 -4.0 -3.8 -3.6
V- (V)

V.35 COMMON-MODE IMPEDANCE

vs. COMMON-MODE VOLTAGE

154

153

152

151

150

COMMON-MODE IMPEDANCE (Ω)

149

148

-2.0 -1.0-1.5 -0.5 0 0.5 1.0 1.5 2.0

COMMON-MODE VOLTAGE (V)

MAX3172-08

MAX3172-10

V.35 COMMON-MODE

IMPEDANCE vs. V+

165

160

155

150

145

COMMON-MODE IMPEDANCE (Ω)

140

135

5.5 5.95.7 6.1 6.3 6.5
V+ (V)

MAX3172-11

165

160

155

150

145

COMMON-MODE IMPEDANCE (Ω)

140

135

-6.6 -6.2 -6.0-6.4 -5.8 -5.6 -5.4

V.35 COMMON-MODE

IMPEDANCE vs. V-

V- (V)

MAX3172-12