Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS232 1/1 SSOP 28

General Description

The MAX3172/MAX3174 contain five software-selec-

table multiprotocol cable termination networks. Each

network is capable of terminating V.11 (RS-422, RS-

530, RS-530A, RS-449, V.36, and X.21) with a 100Ω dif-

ferential 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 net-

works 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/RS-

449, 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 V-

generated by the MAX3171/MAX3173 charge pump.

The MAX3172/MAX3174 transceiver is software selec-

table 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

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

D1D2

R2R3

MAX3170

RXD RXC TXDTXC SCTE

R2R3

MAX3171

MAX3173

MAX3172

MAX3174

CTS DSR RTSDTR LLDCD

CTS B

CTS A

DSR B

DSR A

DCD B

DCD A

DTR B

DTR A

RTS B

RTS A

SHIELD

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 1618 3 9 17 12 15 11 24 14 2

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.

Summary of content (19 pages)

PAGE 1
9-1801; Rev 2; 6/04 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers 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, RS530A, RS-449, V.36, and X.21), V.10 and V.
PAGE 2
MAX3172/MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND unless otherwise noted.) Supply Voltages VCC ......................................................................-0.3V to +4V V+ (Note 1) ..........................................................-0.3V to +7V V- (Note 1) ...........................................................+0.3V to -7V V+ to V- (Note 1) ..................................................
PAGE 3
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers (VCC = +3.3V ± 5%, TA = TMIN to TMAX. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted. See Note 2 for V+ and V- input voltage conditions.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC OUTPUT (R4OUT) Output High Voltage VOH ISOURCE = 1.0mA Output Low Voltage VOL ISINK = 1.6mA Rise or Fall Time tr, tf 10% to 90%, CL = 15pF VCC - 1.0 0.
PAGE 4
MAX3172/MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V ± 5%, TA = TMIN to TMAX. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted. See Note 2 for V+ and V- input voltage conditions.) PARAMETER SYMBOL CONDITIONS MIN TYP ±5.0 ±5.4 MAX UNITS V.28 TRANSMITTER Output Voltage Swing VO Short-Circuit Current ISC Output Slew Rate SR RL = 3kΩ, Figure 3 ±6.
PAGE 5
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers V.28 60kbps TRANSMITTER WAVEFORM (3kΩ/1000pF LOAD) V.28 SLEW RATE vs. LOAD CAPACITANCE SLEW RATE (V/µs) MAX3172-01 MAX3172-02 24 22 20 18 16 RL = 3kΩ 5V +SLEW T4IN 5V/div 0 14 12 10 8 5V -SLEW 6 4 2 0 T4OUT 5V/div 0 -5V 500 0 1000 1500 2000 2500 10µs/div 3000 LOAD CAPACITANCE (pF) V.10 RISE AND FALL TIMES vs. LOAD CAPACITANCE V.10 60kbps TRANSMITTER WAVEFORM (450Ω/100pF) MAX3172-04 MAX3172-03 2.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V (see Note 2 in Electrical Characteristics table), TA = +25°C, unless otherwise noted.) V.11/V.35 DIFFERENTIAL-MODE IMPEDANCE vs. V+ V.11/V.35 DIFFERENTIAL-MODE IMPEDANCE vs. V- 104.5 104.0 103.5 103.0 4.4 4.6 4.8 5.0 104.0 103.5 5.2 5.4 -5.4 -5.2 -5.0 -4.8 -4.6 -4.4 -4.2 -4.0 -3.8 -3.6 V- (V) V.35 COMMON-MODE IMPEDANCE vs. TEMPERATURE V.35 COMMON-MODE IMPEDANCE vs. COMMON-MODE VOLTAGE 152 VCM = -2.
PAGE 7
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers A A R1 52Ω R1 52Ω OHMMETER S1 ON R3 127Ω S1 ON R3 127Ω S2 OFF OHMMETER S2 ON R2 52Ω R2 52Ω VCM = ±2V B B VCM = ±7V OR ±2V Figure 1. V.11 or V.35 Differential Impedance Measurement T Figure 2. V.35 Common-Mode Impedance Measurement T CL Figure 3. V.10/V.28 Driver Test Circuit R RL 15pF Figure 4. V.10/V.
PAGE 8
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers MAX3172/MAX3174 Pin Description 8 PIN NAME FUNCTION 1 M2 Mode-Select Pin (see Tables 1 and 3 for detailed information) 2 M1 Mode-Select Pin (see Tables 1 and 3 for detailed information) 3 M0 Mode-Select Pin (see Tables 1 and 3 for detailed information) 4 VCC +3.3V Supply Voltage (±5%). Bypass VCC to GND with a 0.1µF capacitor.
PAGE 9
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers MAX3172/MAX3174 Table 1. Termination Mode Selection MODE V.10/RS-423 RS-530A M2 0 M1 0 M0 0 DCE/DTE 0 INVERT X R1 Z R2 Z R3 Z R4 Z R5 Z 0 0 1 0 X Z Z V.11 V.11 V.11 RS-530 0 1 0 0 X Z Z V.11 V.11 V.11 X.21 0 1 1 0 X Z Z V.11 V.11 V.11 V.35 1 0 0 0 X V.35 V.35 V.35 V.35 V.35 V.11 RS-449/V.36 1 0 1 0 X Z Z V.11 V.11 V.
PAGE 10
MAX3172/MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers Table 3. R4/T4 Mode-Select Table PROTOCOL M2 M1 M0 DCE/DTE INVERT T4 R4 Not Used (Default V.11) 0 0 0 0 0 Z V.10 RS-530A 0 0 1 0 0 Z V.10 RS-530 0 1 0 0 0 Z V.10 X.21 0 1 1 0 0 Z V.10 V.35 1 0 0 0 0 Z V.28 RS-449/V.36 1 0 1 0 0 Z V.10 V.28/RS-232 1 1 0 0 0 Z V.28 No Cable 1 1 1 0 0 Z Z Not Used (Default V.11) 0 0 0 1 0 V.
PAGE 11
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers MAX3172/MAX3174 *NODE C IS PROVIDED IN NETWORKS 1,2,3. A A A R1 52Ω R1 52Ω R1 52Ω C* C* S1 ON C* S1 OFF S1 ON R3 127Ω R3 127Ω S2 OFF R3 127Ω S2 ON R2 52Ω S2 OFF R2 52Ω B R2 52Ω B B V.11 MODE V.35 MODE HIGH-Z MODE Figure 5. MAX3172/MAX3174 Termination Network Configurations BALANCED INTERCONNECTING CABLE GENERATOR LOAD CABLE RECEIVER TERMINATION A′ A 100Ω MIN B B′ C C′ Figure 6. Typical V.
PAGE 12
MAX3172/MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers A′ A MAX3170 R5 30kΩ R1 52Ω R8 5kΩ MAX3172 MAX3174 R6 10kΩ RECEIVER S3 S1 R3 127Ω S2 R7 10kΩ R2 52Ω B′ R4 30kΩ B C′ GND Figure 7. V.11 Termination and Internal Resistance Networks BALANCED INTERCONNECTING CABLE GENERATOR A 50Ω LOAD A′ 125Ω CABLE TERMINATION 125Ω 50Ω RECEIVER 50Ω 50Ω B B′ C C′ Figure 8. Typical V.35 Interface with a minimum of a 100Ω resistor (Figure 6).
PAGE 13
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers MAX3172/MAX3174 A′ A MAX3170 R5 30kΩ R1 52Ω R8 5kΩ MAX3172 MAX3174 R6 10kΩ RECEIVER S3 S1 R3 127Ω S2 R7 10kΩ R2 52Ω B′ R4 30kΩ B C′ GND Figure 9. V.35 Termination and Internal Resistance Networks A DRIVER The V.35 specification allows for ±4V of ground difference between the V.35 generator and V.35 load. The V.35 data rates may be as high as 10Mbps.
PAGE 14
MAX3172/MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers A′ A MAX3170 R5 30kΩ R1 52Ω R8 5kΩ MAX3172 MAX3174 R6 10kΩ RECEIVER S3 S1 R3 127Ω S2 R7 10kΩ R2 52Ω B′ R4 30kΩ B C′ GND Figure 11. V.28 Termination and Internal Resistance Networks GENERATOR UNBALANCED INTERCONNECTING CABLE LOAD CABLE TERMINATION A A′ C C′ RECEIVER V.10 Interface Figure 12. Typical V.28 and V.10 Interface IZ -10V 3.25mA -3V VZ +10V +3V -3.25mA Figure 13. V.
PAGE 15
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers A MAX3172 MAX3174 R5 30kΩ R8 5kΩ R6 10kΩ Complete Multiprotocol X.21 Interface RECEIVER S3 R7 10kΩ R4 30kΩ A complete DTE-to-DCE interface operating in X.21 mode is shown in Figure 16. The MAX3172/MAX3174 terminate the V.11 clock and data signals, and its transceiver carries the local loopback (LL) signal. The MAX3170 carries the clock and data signals, and the MAX3171/MAX3173 carry the control signals.
PAGE 16
CTS(DTE) RTS(DCE) DSR(DTE) DTR(DCE) RXD(DTE) TXD(DCE) LL(DTE) RXC(DTE) LL(DCE) SCTE(DCE) DTR(DTE) DSR(DCE) RTS(DTE) DCD(DTE) CTS(DCE) DCD(DCE) SCTE(DTE) RXC(DCE) TXC(DTE) TXD(DTE) TXC(DCE) RXD(DCE) MAX3171 MAX3173 R3 R2 R1 D3 D2 D1 M0 M1 M2 DCE/DTE MAX3172 MAX3174 R4 R3 R2 16 3 9 17 R1 D3 D2 D1 D4 MAX3170 M0 M1 M2 DCE/DTE MAX3172/MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers Figure 15.
PAGE 17
+3.
PAGE 18
+3.
PAGE 19
+3.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers SSOP.EPS 2 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C D 0.20 0.09 0.004 0.008 SEE VARIATIONS E 0.205 e 0.212 0.0256 BSC 5.20 INCHES D D D D D 5.38 MILLIMETERS MIN MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.