Datasheet

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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.

________________________Applications

Data Networking PCI Cards

CSU and DSU Telecommunications

Data Routers

Features

♦ Industry’s First +3.3V Single-Supply Transceiver

♦ 3V/5V Logic-Compatible I/O

♦ Certified TBR-1 and TBR-2 Compliant (NET1 and

NET2)—Pending Completion

♦ Supports V.28 (RS-232), V.11 (RS-449/V.36,

EIA530, EIA530-A, X.21), and V.35 Protocols

♦ Software-Selectable DTE/DCE

♦ Complete DTE/DCE Port with MAX3171/MAX3173

and MAX3172/MAX3174

♦ True Fail-Safe Receiver Operation

♦ Available in Small 28-Pin SSOP Package

♦ 10Mbps Operation (V.11/V.35)

♦ Requires Only Four Tiny Surface-Mount

Capacitors

♦ All Transmitter Outputs Are Fault Protected to

±15V to Survive Cable Miswiring

MAX3170

+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-

Selectable Clock/Data Transceiver

________________________________________________________________ Maxim Integrated Products 1

19-1703; Rev 0; 4/00

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.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX3170CAI 0°C to +70°C 28 SSOP

Pin Configuration appears at end of data sheet.

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

Summary of content (16 pages)

PAGE 1
9-1703; Rev 0; 4/00 +3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver Features ♦ Industry’s First +3.3V Single-Supply Transceiver ♦ 3V/5V Logic-Compatible I/O ♦ Certified TBR-1 and TBR-2 Compliant (NET1 and NET2)—Pending Completion ♦ Supports V.28 (RS-232), V.11 (RS-449/V.36, EIA530, EIA530-A, X.21), and V.
PAGE 2
MAX3170 +3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver 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, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver (VCC = +3.3V ±5%, C1 = C2 = 1µF, C3 = C4 = 3.3µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and VCC = +3.3V.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC OUTPUTS (R_OUT) Output High Voltage VOH ISOURCE = 1.0mA Output Low Voltage VOL ISINK = 1.6mA Rise or Fall Time tr, tf 10% to 90% R_OUT = GND Output Leakage Current (Receiver Output Tristated) VCC - 1.0 V 0.
PAGE 4
MAX3170 +3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V ±5%, C1 = C2 = 1µF, C3 = C4 = 3.3µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and VCC = +3.3V.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V.35 TRANSMITTER Differential Output Voltage 0.44 0.55 0.
PAGE 5
+3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver 150 100 50 MAX3170-02 60 40 0 0.1 1 10 100 1000 10,000 DCE MODE, VCM = 0 ALL TRANSMITTERS OPERATING AT SPECIFIED RATE 150 100 50 0 0 50 100 150 200 0.1 250 1 10 100 10,000 1000 DATA RATE (kbps) DATA RATE (kbps) V.11 DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE V.28 OUTPUT VOLTAGE vs. TEMPERATURE V.35 DIFFERENTIAL OUTPUT VOLTAGE vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V, C1 = C2 = 1.0µF, C3 = C4 = 3.3µF, TA = +25°C, unless otherwise noted.) V.35 LOOPBACK SCOPE PHOTO V.28 LOOPBACK SCOPE PHOTO V.11 LOOPBACK SCOPE PHOTO V.28 SLEW RATE vs. LOAD CAPACITANCE V.11 TRANSMITTER PROPAGATION DELAY vs. TEMPERATURE V.11 RECEIVER PROPAGATION DELAY vs.
PAGE 7
+3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver 100pF R 100Ω VOD 50pF VOC R 100pF Figure 2. V.11 AC Test Circuit Figure 1. V.11 DC Test Circuit 50Ω 50Ω 125Ω 50Ω VCM 125Ω 50Ω 50pF Figure 3. V.35 Transmitter/Receiver Test Circuit CL RL 50pF Figure 4. V.28 Driver Test Circuit Figure 5. V.
PAGE 8
+3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver MAX3170 Pin Description PIN NAME FUNCTION 1 V+ 2 C2+ Positive Terminal of the Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 1µF ceramic capacitor. 3 C2- Negative Terminal of the Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 1µF ceramic capacitor.
PAGE 9
+3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver MAX3170 Table 1. Mode Selection PROTOCOL LOGIC INPUTS TRANSMITTERS RECEIVERS M2 M1 M0 DCE/DTE T1 T2 T3 R1 R2 R3 V.11 0 0 0 0 V.11 V.11 Z V.11 V.11 V.11 RS-530A 0 0 1 0 V.11 V.11 Z V.11 V.11 V.11 RS-530 0 1 0 0 V.11 V.11 Z V.11 V.11 V.11 X.21 0 1 1 0 V.11 V.11 Z V.11 V.11 V.11 V.35 1 0 0 0 V.35 V.35 Z V.35 V.35 V.35 RS-449/V.36 1 0 1 0 V.11 V.11 Z V.11 V.
PAGE 10
MAX3170 +3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver receiver threshold between -25mV and -200mV in the V.11 and V.35 modes. If the differential receiver input voltage (B - A) is ≥-25mV, R_OUT is logic HIGH. If (B A) is ≤ -200mV, R_OUT is logic LOW. In the case of a terminated bus with all transmitters disabled, the receiver’s differential input voltage is pulled to zero by the termination.
PAGE 11
+3.
PAGE 12
MAX3170 +3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver IZ BALANCED INTERCONNECTING CABLE GENERATOR 3.25mA LOAD CABLE TERMINATION -3V -10V RECEIVER A′ A +3V 100Ω MIN B B′ C C′ -3.25mA Figure 9. Receiver Input Impedance Curve Figure 8. Typical V.11 Interface A′ A MAX3170 R5 30k R1 51.5Ω R8 5k MAX3172 MAX3174 R6 10k RECEIVER S3 S1 R3 124Ω S2 R7 10k R2 51.5Ω B′ R4 30k B C′ GND Figure 10. V.
PAGE 13
+3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver MAX3170 A′ A MAX3170 R5 30k R1 51.5Ω R8 5k MAX3172 MAX3174 R6 10k RECEIVER S3 S1 R3 124Ω S2 R7 10k R2 51.5Ω B′ R4 30k B C′ GND Figure 12. V.35 Termination and Internal Resistance Networks GENERATOR UNBALANCED INTERCONNECTING CABLE A LOAD CABLE TERMINATION RECEIVER A′ This application requires only one DB-25 connector, but separate cables for DCE or DTE signal routing.
PAGE 14
MAX3170 +3.3V, Multiprotocol, 3 Tx/3 Rx, SoftwareSelectable Clock/Data Transceiver A′ A MAX3170 R5 30k R1 51.5Ω R8 5k MAX3172 MAX3174 R6 10k RECEIVER S3 S1 R3 124Ω S2 R7 10k R2 51.5Ω B′ R4 30k B C′ GND Figure 14. V.
PAGE 15
+3.
PAGE 16
Pin Configuration Chip Information TRANSISTOR COUNT: 4058 TOP VIEW V+ 1 28 C1+ C2+ 2 27 VCC C2- 3 26 GND V- 4 25 C1- T1IN 5 T2IN 6 24 T1OUTA MAX3170 23 T1OUTB T3IN 7 22 T2OUTA R1OUT 8 21 T2OUTB R2OUT 9 20 T3OUTA/R1INA R3OUT 10 19 T3OUTB/R1INB M0 11 18 R2INB M1 12 17 R2INA M2 13 16 R3INA DCE/DTE 14 15 R3INB 28 SSOP Package Information SSOP.EPS MAX3170 +3.