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19-1992; Rev 0; 4/01
+5V Multiprotocol, Software-Selectable Control Transceivers
General Description
The MXL1544/MAX3175 are four-driver/four-receiver multiprotocol transceivers that operate from a single +5V supply in conjunction with the MXL1543. The MXL1544/MAX3175, along with the MXL1543 and MXL1344A, form a complete software-selectable data terminal equipment (DTE) or data communication equipment (DCE) interface port that supports the V.28 (RS-232), V.10/V.11 (RS-449/V.36, EIA-530, EIA-530A, X.21, RS-423), and V.35 protocols. The MXL1544/ MAX3175 transceivers carry serial interface control signaling, while the MXL1543 carries the high-speed clock and data signals. Typically, the MXL1543 is terminated using the MXL1344A. The MAX3175 is identical to the MXL1544 except for the addition of a 10s (typ) glitch rejection circuit at the receiver inputs. The MXL1544/ MAX3175 are available in 28-pin SSOP packages.
Features
o MXL1544/MAX3175, MXL1543, MXL1344A Chipset Is Pin Compatible with LTC1544, LTC1543, LTC1344A Chipset o Chipset Operates from a Single +5V Supply o Software-Selectable DCE/DTE o Supports V.28 (RS-232), V.10/V.11 (RS-449/V.36, EIA-530, EIA-530A, X.21, RS-423) Protocols o Flow-Through Pin Configuration o True Fail-Safe Operation o Low 0.5A Shutdown Current (No-Cable Mode) o 10s Receiver Input Deglitching (MAX3175 Only) o TUV-Certified NET1/NET2 and TBR1/TBR2 Compliant
MXL1544/MAX3175
Applications
Data Networking CSU and DSU Data Routers Switches PCI Cards Telecommunication Equipment
Ordering Information
PART MXL1544CAI MAX3175CAI TEMP. RANGE 0C to +70C 0C to +70C PIN-PACKAGE 28 SSOP 28 SSOP
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
LL CTS DSR DCD DTR RTS RXD RXC TXC SCTE TXD
D4
R4
R3
R2
R1
MXL1544 MAX3175
D3
D2
D1
R3
R2
R1
MXL1543
D3
D2
D1 MXL1344A
18 LL A (141)
13 5 10 8 CTS A (106) CTS B DSR A (109) DSR B
22 6 DCD A (107) DCD B
23 20 19 4 DTR A (108) DTR B RTS A (105) RTS B
1
7
16 3 RXD A (104) RXD B
9 17 RXC A (115) RXC B
12 15 11 24 14 2 TXC A (114) TXC B SCTE A (113) SCTE B TXD A (103) TXD B
DB-25 CONNECTOR
________________________________________________________________ Maxim Integrated Products
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.
SG (102) SHIELD (101)
1
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
ABSOLUTE MAXIMUM RATINGS
All Voltages to GND Unless Otherwise Noted Supply Voltages VCC .......................................................................-0.3V to +6V VDD ....................................................................-0.3V to +7.2V VEE........................................................................+0.3V to -7V VDD to VEE (Note 1)............................................................13V Logic Input Voltage M0, M1, M2, DCE/DTE, INVERT, T_IN..................-0.3V to +6V Logic Output Voltage R_OUT ....................................................-0.3V to (VCC + 0.3V) Transmitter Outputs T_OUT_, T_OUT_/R_IN........................................-15V to +15V Short-Circuit Duration.............................................Continuous Receiver Inputs R_IN_, T_OUT_/R_IN_ .........................................-15V to +15V Continuous Power Dissipation (TA = +70C) 28-Pin SSOP (derate 11.1mW/C above +70C) .........889mW Operating Temperature Range...............................0C to +70C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: VDD and VEE- can have maximum magnitude of 7.2V and 7V, respectively, but their 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
(VCC = +5V, VDD = +6.8V, VEE = -5.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER POWER SUPPLIES RS-530, RS-530A, X.21, no load VCC Supply Current (DCE Mode) (Digital Inputs = GND or VCC) (Transmitters Outputs Static) RS-530, RS-530A, X.21, full load ICC V.28, no load V.28, full load No-cable mode, Invert = VCC RS-530, RS-530A, X.21, no load VEE Supply Current (DCE Mode) (Digital Inputs = GND or VCC) (Transmitters Outputs Static) RS-530, X.21, full load IEE RS-530A, full load V.28, no load V.28, full load No-cable mode RS-530, RS-530A, X.21, no load VDD Supply Current (DCE Mode) (Digital Inputs = GND or VCC) (Transmitters Outputs Static) Internal Power Dissipation (DCE Mode) RS-530, RS-530A, X.21, full load IDD V.28, no load V.28, full load No-cable mode PD RS-530, RS-530A, X.21, full load V.28, full load 2.0 0.8 10 -100 -50 -30 10 2.7 95 1 1 0.5 2.1 14 25 1 12 0.5 0.6 1 1 12 0.5 300 54 A mW mA A mA 120 2 2 10 A mA SYMBOL CONDITIONS MIN TYP MAX UNITS
LOGIC INPUTS (M0, M1, M2, DCE/DTE, INVERT, T1IN, T2IN, T3IN, T4IN) Input High Voltage VIH Input Low Voltage VIL T1IN, T2IN, T3IN, T4IN M0, M1, M2, DCE/DTE, INVERT = Logic Input Current IIN GND M0, M1, M2, DCE/DTE, INVERT = VCC
V V
A
2
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+5V Multiprotocol, Software-Selectable Control Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VDD = +6.8V, VEE = -5.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER Output High Voltage Output Low Voltage Output Short-Circuit Current Output Pullup Current RECEIVER INPUTS Receiver Glitch Rejection V.11 TRANSMITTER Open-Circuit Differential Output Voltage Loaded Differential Output Voltage Change in Magnitude of Output Differential Voltage Common-Mode Output Voltage Change in Magnitude of Output Common-Mode Voltage Short-Circuit Current Output Leakage Current Rise or Fall Time Transmitter Input to Output Data Skew Output-to-Output Skew V.11 RECEIVER Differential Input Voltage Input Hysteresis Receiver Input Current Receiver Input Resistance Rise or Fall Time Receiver Input to Output Data Skew VTH VTH IIN RIN tr, tf tPHL, tPLH |tPHL tPLH| -7V VCM 7V -7V VCM 7V -10V VA,B 10V -10V VA,B 10V (Figures 2, 6) (Figures 2, 6) (Figures 2, 6) MXL1544 MAX3175 MXL1544 MAX3175 15 30 15 50 10 4 1 16 80 -200 15 200 40 0.66 mV mV mA k ns ns s ns s VODO Open circuit, R = 1.95k (Figure 1) R = 50 (Figure 1), TA = +25C R = 50 (Figure 1) VOD VOC VOC ISC IZ tr, tf tPHL, tPLH |tPHL tPLH| R = 50 (Figure 1) R = 50 (Figure 1) R = 50 (Figure 1) VOUT = GND -0.25V < VOUT < +0.25V, power-off or nocable mode R = 50 (Figures 2, 5) R = 50 (Figures 2, 5) (Figures 2, 5) (Figures 2, 5) 2 1 15 50 3 3 0.5 VODO 2 0.2 3 0.2 150 100 25 75 12 V V V mA A ns ns ns ns 5 0.67 VODO V MAX3175 only 5 10 15 s SYMBOL VOH VOL ISC IL CONDITIONS ISOURCE = 4mA ISINK = 4mA 0 VOUT VCC VOUT = 0, no-cable mode -50 70 MIN 3 TYP 4.5 0.3 0.8 50 MAX UNITS V V mA A
MXL1544/MAX3175
LOGIC OUTPUTS (R1OUT, R2OUT, R3OUT, R4OUT)
VODL
V
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+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VDD = +6.8V, VEE = -5.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER V.10 TRANSMITTER Open-Circuit Output Voltage Swing Output Voltage Swing Short-Circuit Current Output Leakage Current Rise or Fall Time Transmitter Input to Output V.10 RECEIVER Differential Threshold Voltage Input Hysteresis Receiver Input Current Receiver Input Impedance Rise or Fall Time VTH VTH IIN RIN tr, tf tPLH Receiver Input to Output tPHL Data Skew V.28 TRANSMITTER Output Voltage Swing Short-Circuit Current Output Leakage Current Output Slew Rate Transmitter Input to Output V.28 RECEIVER Input Low Voltage Input High Voltage Input Hysteresis Input Resistance Rise or Fall Time VIL VIH VHYS RIN tr, tf -15V < VIN < +15V (Figures 4, 8) 3 2.0 1.3 1.3 0.05 5 15 0.3 7 0.8 V V V k ns VO ISC IZ SR tPHL tPLH Open circuit (Figure 3) RL = 3k (Figure 3) VO = GND -0.25V VOUT +0.25V, power-off or no-cable mode RL = 3k, CL = 2500pF (Figures 3, 7) RL = 3k, CL = 2500pF (Figures 3, 7) 4 1.5 1.5 1 5 6 150 100 30 2.5 3 7 V V mA A V/s s |tPHL tPLH| (Figures 4, 8) (Figures 4, 8) -10V VA 10V -10V VA 10V (Figures 4, 8) MXL1544 MAX3175 MXL1544 MAX3175 MXL1544 MAX3175 15 30 15 55 10 109 10 60 1 -250 25 250 50 0.66 mV mV mA k ns ns s ns s ns s VO RL = 3.9k (Figure 3) RL = 450 (Figure 3) VT ISC IZ tr, tf tPHL, tPLH RL = 450 (Figure 3), TA = +25C VO = GND, TA = +25C -0.25V < VOUT < +0.25V, power-off or no-cable mode RL = 450, CL = 100pF (Figures 3, 7) RL = 450, CL = 100pF (Figures 3, 7) 1 2 1 4 3.6 0.9 x VO 150 100 V mA A s s 6 V SYMBOL CONDITIONS MIN TYP MAX UNITS
4
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+5V Multiprotocol, Software-Selectable Control Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VDD = +6.8V, VEE = -5.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER SYMBOL tPLH Receiver Input to Output tPHL (Figures 4, 8) CONDITIONS MXL1544 MAX3175 MXL1544 MAX3175 MIN TYP 60 10 70 10 450 MAX 100 UNITS ns s ns s
MXL1544/MAX3175
Note 2: MXL1544/MAX3175 are designed to operate with VDD and VEE supplied by the MXL1543 charge pump.
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
V.11 MODE SUPPLY CURRENT (ICC) vs. DATA RATE
MXL1544/MAX3175 toc01
V.11 MODE SUPPLY CURRENT (IDD) vs. DATA RATE
9 8 7 IDD (mA) 6 5 4
FULL LOAD, R = 50 100 80 ICC (mA) 60 40 20 NO LOAD, R = 1.95k 0 0.1 1 10 100 1000 DCE MODE INVERT = 1
DCE MODE INVERT = 1
3 2 1 0 10,000 0.1 1 10 100 1000 10,000 DATA RATE (kbps) DATA RATE (kbps) FULL, R = 50 NO LOAD, R = 1.95k
V.11 MODE SUPPLY CURRENT (IEE) vs. DATA RATE
MXL1544/MAX3175 toc03
V.28 MODE SUPPLY CURRENT (ICC) vs. DATA RATE
0.72 0.71 ICC (mA) 0.70 0.69 0.68 FULL LOAD (RL = 3k, CL = 2500) AND NO LOAD DCE MODE INVERT = 0
MXL1544/MAX3175 toc04
10 9 8 7 IEE (mA) 6 5 4 3 2 1 0 0.1 1 10 100 1000 DCE MODE INVERT = 1
0.73
FULL, R = 50 NO LOAD, R = 1.95k
0.67 0.66 0.65 10,000 0 50 100 150 200 250
DATA RATE (kbps)
DATA RATE (kbps)
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MXL1544/MAX3175 toc02
120
10
5
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
V.28 MODE SUPPLY CURRENT (IDD) vs. DATA RATE
MXL1544/MAX3175 toc05
V.28 MODE SUPPLY CURRENT (IEE) vs. DATA RATE
DCE MODE INVERT = 0
MXL1544/MAX3175 toc06
25
35 30 25 IEE (mA) 20 15 10
DCE MODE INVERT = 0
20
IDD (mA)
15
FULL LOAD, RL = 3k, CL = 2500pF
10
FULL LOAD, RL = 3k, CL = 2500pF NO LOAD 0 50 100 150 200 250
5 NO LOAD 0 0 50 100 150 DATA RATE (kbps) 200 250
5 0
DATA RATE (kbps)
V.11 LOADED DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE
MXL1544/MAX3175 toc07
V.10 LOADED OUTPUT VOLTAGE vs. TEMPERATURE
8 6 OUTPUT VOLTAGE (V) 4 2 0 -2 -4 -6 -8 -10 VOUTDCE MODE RL = 450 VOUT+
MXL1544/MAX3175 toc08
5 DIFFERENTIAL OUTPUT VOLTAGE (V) 4 3 2 1 0 -1 -2 -3 -4 -5 0 10 20 30 40 50 60 VOUTDCE MODE INVERT = 1 RL = 50 VOUT+
10
70
0
10
20
30
40
50
60
70
TEMPERATURE (C)
TEMPERATURE (C)
V.28 LOADED OUTPUT VOLTAGE vs. TEMPERATURE
MXL1544/MAX3175 toc09
V.11 RECEIVER INPUT CURRENT vs. INPUT VOLTAGE
MXL1544/MAX3175 toc10
10 8 6 OUTPUT VOLTAGE (V) 4 2 0 -2 -4 -6 -8 -10 0
DCE MODE RL = 3k
300 200 INPUT CURRENT (A) 100 0 -100 -200 -300
VOUT+
VOUT-
10
20
30
40
50
60
70
-10
-5
0 INPUT VOLTAGE (V)
5
10
TEMPERATURE (C)
6
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+5V Multiprotocol, Software-Selectable Control Transceivers
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
V.28 RECEIVER INPUT CURRENT vs. INPUT VOLTAGE
MXL1544/MAX3175 toc11
MXL1544/MAX3175
V.28 SLEW RATE vs. LOAD CAPACITANCE
16 14 SLEW RATE (V/s) 12 10 8 6 4 2 0 SLEWSLEW+
MXL1544/MAX3175 toc12
5 4 3 INPUT CURRENT (mA) 2 1 0 -1 -2 -3 -4 -5 -15 -10 -5 0 5 10
18
15
0
1000
2000
3000
4000
5000
INPUT VOLTAGE (V)
CAPACITANCE (pF)
V.10 TRANSMITTER RISE AND FALL TIME vs. LOAD CAPACITANCE
RISE
MXL1544/MAX3175 toc13
MXL1544 LOOPBACK SCOPE PHOTO V.11 MODE (UNLOADED)
MXL1544/MAX3175 toc14
3.5 3.0 RISE/FALL TIME (s) 2.5 2.0 1.5 1.0 0.5 0 0 500 1000 1500 2000 2500
TIN
5V/div
FALL
TOUT/ RIN
5V/div
ROUT
5V/div
3000
4s/div
CAPACITANCE (pF)
MXL1544 LOOPBACK SCOPE PHOTO V.28 MODE (LOADED)
MXL1544/MAX3175 toc15
MXL1544 LOOPBACK SCOPE PHOTO V.10 MODE (LOADED)
MXL1544/MAX3175 toc16
TIN
5V/div
TIN
5V/div
TOUT/ RIN
5V/div
TOUT/ RIN
5V/div
ROUT
5V/div
ROUT
5V/div
4s/div
4s/div
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+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 NAME VCC VDD T1IN T2IN T3IN R1OUT R2OUT R3OUT T4IN R4OUT M0 M1 M2 DCE/DTE INVERT T4OUTA/R4INA R3INB R3INA R2INB R2INA T3OUTB/R1INB T3OUTA/R1INA T2OUTB T2OUTA T1OUTB T1OUTA GND VEE FUNCTION +5V Supply Voltage (5%). Bypass with a 1F capacitor to ground. Positive Supply Generated by MXL1543. Bypass with a 1F capacitor to ground. Transmitter 1 TTL-Compatible Input Transmitter 2 TTL-Compatible Input Transmitter 3 TTL-Compatible Input Receiver 1 CMOS Output Receiver 2 CMOS Output Receiver 3 CMOS Output Transmitter 4 TTL-Compatible Input Receiver 4 CMOS Output TTL-Compatible Mode Select Pin with Internal Pullup to VCC TTL-Compatible Mode Select Pin with Internal Pullup to VCC TTL-Compatible Mode Select Pin with Internal Pullup to VCC TTL-Compatible Input with Internal Pullup to VCC. Logic level high selects DCE interface. TTL Input with Internal Pullup to VCC. INVERT = HIGH reverses action of DCE/DTE for Channel 4. Transmitter Output/Inverting Receiver Input Noninverting Receiver Input Inverting Receiver Input Noninverting Receiver Input Inverting Receiver Input Noninverting Transmitter Output/Noninverting Receiver Input Inverting Transmitter Output/Inverting Receiver Input Noninverting Transmitter Output Inverting Transmitter Output Noninverting Transmitter Output Inverting Transmitter Output Ground Negative Supply Generated by MXL1543. Bypass with a 1F capacitor to ground.
8
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+5V Multiprotocol, Software-Selectable Control Transceivers
Test Circuits
MXL1544/MAX3175
D R VOD
A
VO R VOC
CL
RL
Figure 1. V.11 DC Test Circuit
Figure 3. V.10/V.28 Driver Test Circuit
100pF D B 100 A A 15pF B R
D
A
R
15pF
100pF
Figure 2. V.11 AC Test Circuit
Figure 4. V.10/V.28 Receiver Test Circuit
Detailed Description
The MXL1544/MAX3175 are four-driver/four-receiver multiprotocol transceivers that operate from a single +5V supply and the charge pump from the MXL1543. The MXL1544/MAX3175, along with the MXL1543 and MXL1344A, form a complete software-selectable DTE or DCE interface port that supports the V.28 (RS-232), V.10/V.11 (RS-449, V.36, EIA-530, EIA-530A, X.21, RS423), and V.35 protocols. The MXL1544 or MAX3175 usually carries the control signals. The MXL1543 carries the high-speed clock and data signals, and the MXL1344A provides termination for the clock and data signals. The MXL1544/MAX3175 feature a 0.5A no-cable mode, true fail-safe operation, and thermal shutdown circuitry. Thermal shutdown protects the drivers against
excessive power dissipation. When activated, the thermal shutdown circuitry places the driver outputs into a high-impedance state. The MAX3175 deglitching feature reduces errors in unterminated equipment. The state of the mode-select pins M0, M1, and M2 determines which serial-interface protocol is selected (Table 1). The state of the DCE/DTE input determines whether the transceivers will be configured as a DTE serial port or a DCE serial port. When the DCE/DTE input is logic HIGH, driver T3 is activated and receiver R1 is disabled. When the DCE/DTE input is logic LOW, driver T3 is disabled and receiver R1 is activated. The INVERT pin state changes the DCE/DTE functionality regarding T4 and R4 only. M0, M1, M2, INVERT, and DCE/DTE are internally pulled up to VCC to ensure logic HIGH if left unconnected.
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9
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
Switching Time Waveforms
5V D 0 V0 B-A -V0 A V0 B tSKEW tSKEW 50% tr 1.5V tPLH 90% 10% VDIFF = V(B) - V(A) 1/2 V0
f = 1MHz: tr 10ns: tf 10ns
1.5V tPHL 90% tf 50% 10%
Figure 5. V.11, V.35 Driver Propagation Delays
V0D2 B-A -V0D2 V0H R V0L
0 tPLH 1.5V
f = 1MHz: tr 10ns: tf 10ns
INPUT
0 tPHL
OUTPUT
1.5V
Figure 6. V.11, V.35 Receiver Propagation Delays
3V D 0 V0 3V A -V0 tf 0 -3V -3V tr 0 1.5V tPHL 0 tPLH 3V
Figure 7. V.10, V.28 Driver Propagation Delays
VIH A VIL V0H R V0L 1.3V tPHL 0.8V 1.7V tPLH 2.4V
Figure 8. V.10, V.28 Receiver Propagation Delays
10
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+5V Multiprotocol, Software-Selectable Control Transceivers
The MXL1544/MAX3175s' mode can be selected through software control of the M0, M1, M2, INVERT, and DCE/DTE inputs. Alternatively, the mode can be selected by shorting the appropriate combination of mode control inputs to GND (the inputs left floating will be internally pulled up to VCC - logic HIGH). If the M0, M1, and M2 mode inputs are all unconnected, the MXL1544/MAX3175 will enter no-cable mode. +250mV and -250mV with input impedance characteristic shown in Figure 11. The MXL1544/MAX3175 V.10 mode receiver has a differential threshold between -250mV and +250mV. To ensure that the receiver has proper fail-safe operation see the Fail-Safe section. To aid in rejecting system noise, the MXL1544/MAX3175 V.10 receiver has a typical hysteresis of 25mV. Switch S3 in Figure 12 is open in V.10 mode to disable the V.28 5k termination at the receiver input. Switch S4 is closed and switch S5 is open to internally ground the receiver B input.
MXL1544/MAX3175
Fail-Safe
The MXL1544/MAX3175 guarantee a logic HIGH receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. The V.11 receiver threshold is set between -200mV and 0mV to guarantee fail-safe operation. If the differential receiver input voltage (B - A) is 0mV, ROUT is logic HIGH. In the case of a terminated bus with all transmitters disabled, the receiver's differential input voltage is pulled to 0 by the termination. With the receiver thresholds of the MXL1544/MAX3175, this results in ROUT logic HIGH. The V.10 receiver threshold is set between -250mV and 0mV. If the V.10 receiver input voltage is less than or equal to -250mV, ROUT is logic HIGH. The V.28 receiver threshold is set between 0.8V and 2.0V. If the receiver input voltage is less than or equal to 0.8V, ROUT is logic HIGH. In the case of a terminated bus with transmitters disabled, the receiver's input voltage is pulled to 0 by the termination.
V.11 (RS-422) Interface
As shown in Figure 13, the V.11 protocol is a fully balanced differential interface. The V.11 driver generates a minimum of 2V between nodes A and B when 100 minimum resistance is presented at the load. The V.11 receiver is sensitive to differential signals of 200mV at receiver inputs A' and B'. The V.11 receiver input must comply with the impedance curve of Figure 11 and reject common-mode signals developed across the cable (referenced from C to C' in Figure 13) of up to 7V. The MXL1544/MAX3175 V.11 mode receiver has a differential threshold between -200mV and +200mV. To ensure that the receiver has proper fail-safe operation; see the Fail-Safe section. To aid in rejecting system noise, the MXL1544/MAX3175 V.11 receiver has a typical hysteresis of 15mV. Switch S3 in Figure 14 is open in V.11 mode to disable the V.28 5k termination at the inverting receiver input. Because the control signals are slow (60kbps), 100 termination resistance is generally not required for the MXL1544/MAX3175. The receiver inputs must also be compliant with the impedance curve shown in Figure 11.
Applications Information
Cable-Selectable Mode
A cable-selectable, multiprotocol DTE/DCE interface is shown in Figure 9. The mode control lines M0, M1, and DCE/DTE are wired to the DB-25 connector. To select the serial interface mode, the appropriate combination of M0, M1, M2, and DCE/DTE are grounded within the cable wiring. The control lines that are not grounded are pulled high by the internal pullups on the MXL1543. The serial interface protocol of the MXL1544/MAX3175 is now selected based on the cable that is connected to the DB-25 interface.
V.28 (RS-232) Interface
The V.28 interface is an unbalanced single-ended interface (Figure 10). The V.28 generator provides a minimum of 5V across the 3k load impedance between A' and C'. The V.28 receiver has single-ended input. The MXL1544/MAX3175 V.28 mode receiver has a threshold between +0.8V and +2.0V. To aid in rejecting system noise, the MXL1544/MAX3175 V.28 receiver has a typical hysteresis of 50mV. Switch S3 in Figure 15 is closed in V.28 mode to enable the 5k V.28 termination at the receiver inputs.
V.10 (RS-423) Interface
The V.10 interface (Figure 10) is an unbalanced singleended interface capable of driving a 450 load. The V.10 driver generates a minimum VO voltage of 4V across A' and C' when unloaded and a minimum voltage of 0.9 V O when loaded with 450. The V.10 receiver has a single-ended input and does not reject common-mode differences between C and C'. The V.10 receiver input trip threshold is defined between
No-Cable Mode
The MXL1544/MAX3175 will enter no-cable mode when the mode-select pins are left unconnected or connected HIGH (M0 = M1 = M2 = 1). In this mode, the multiprotocol drivers and receivers are disabled and the
11
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+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
C6 C7 C8 100pF 100pF 100pF
3 VCC 5V 14 3 C3 4.7F C1 1F C4 1F DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC 5 6 7 DTE_TXC/DCE_TXC DTE_RXC/DCE_SCTE DTE_RXD/DCE_TXD 8 9 10 D1 D2 D3 R1 R2 R3 20 19 18 17 16 15 1 2 4 CHARGE PUMP 28 27 26 25 24 23 22 21 C2 1F 2 C5 4.7F C13 1F VCC
8
11
12 13 MXL1344A
LATCH DCE/DTE M2
21
M1
C12 1F
54
67
9 10 16 15 18 17 19 20 22 23 24 1 VCC
M0
VEE
DTE 2 TXD A 14 TXD B 24 SCTE A 11 SCTE B 15 12 17 9 3 16 7
DCE RXD A RXD B RXC A RXC B
TXC A TXC B
TXC A TXC B
RXC A SCTE A RXC B SCTE B RXD A TXD A RXD B TXD B SG
11
NC
M0 MXL1543 12 M1 13 M2 14 DCE/DTE
1
SHIELD
DB-25 CONNECTOR C9 1F C10 1F VCC 1 28 VCC VDD VEE GND 27 C11 1F 25 DCE/DTE 21 M1 18 M0 4 RTS A CTS A 19 RTS B CTS B 20 DTR A DSR A 23 DTR B DSR B 8 DCD A 10 DCD B 6 DSR A 22 DSR B 5 CTS A 13 CTS B
2
DTE_RTS/DCE_CTS DTE_DTR/DCE_DSR
3 4 5
D1 D2 D3 R1 R2 R3 R4 D4
26 25 24 23
DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR DTE_CTS/DCE_RTS
6 7 8 10 9 11
22 21 20 19 18 17 16 CABLE WIRING FOR MODE SELECTION PIN 18 PIN 7 RS-449. V.36 N.C. PIN 7 RS-232 MODE V.35 PIN 21 PIN 7 PIN 7 N.C. CABLE WIRING FOR DTE/DCE SELECTION MODE PIN 25 PIN 7 DTE N.C. DCE
DCD A DCD B DTR A DTR B RTS A RTS B
NC
M0 MXL1544 MAX3175 12 M1 13 M2 14 15 DCE/DTE INVERT
Figure 9. Cable-Selectable Multiprotocol DCE/DTE Port with DB-25 Connector
12
______________________________________________________________________________________
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
GENERATOR UNBALANCED INTERCONNECTING CABLE CABLE TERMINATION LOAD RECEIVER
A
A
C
C
Figure 10. Typical V.10/V.28 Interface
IZ
3.25mA
GENERATOR
BALANCED INTERCONNECTING CABLE
LOAD CABLE RECEIVER TERMINATION A 100 MIN
-10V
-3V +3V VZ +10V
A
-3.25mA
B C
B C
Figure 11. Receiver Input Impedance Curve
Figure 13. Typical V.11 Interface
A
A R5 30k R8 5k R6 10k
MXL1544 MAX3175
RECEIVER
supply current is less than 10A. The receiver outputs enter a high-impedance state in no-cable mode, which allows these output lines to be shared with other receiver outputs (the receiver outputs have an internal pullup resistor to pull the outputs HIGH if not driven). Also, in no-cable mode, the transmitter outputs enter a highimpedance state, so these output lines can be shared with other devices.
S3
Receiver Glitch Rejection
To improve operation in an unterminated or otherwise noisy system, the MAX3175 features 10s of receiver input glitch rejection. The glitch-rejection circuitry blocks the reception of high-frequency noise (tB < 5s) while receiving a low-frequency signal (tB >15s) allowing glitch-free operation in unterminated systems at up to 60kbps. The MXL1544 does not have this feature and can be operated at frequencies greater than 60kbps if properly terminated.
R7 10k B B R4 30k S5 C GND S4
Figure 12. V.10 Internal Resistance Network ______________________________________________________________________________________ 13
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
A A R5 30k R8 5k R6 10k A A R5 30k R8 5k RECEIVER S3 R6 10k
MXL1544 MAX3175
MXL1544 MAX3175
RECEIVER
S3
R7 10k B B R4 30k B B R4 30k
R7 10k
C GND
C GND
Figure 14. V.11 Internal Resistance Networks
Figure 15. V.28 Termination and Internal Resistance Network
DTE vs. DCE Operation
Figure 16 shows a port with one DB-25 connector that can be configured for either DTE or DCE operation. The configuration requires separate cables for proper signal routing in DTE or DCE operation. Figure 16 illustrates a DCE or DTE controller-selectable interface. The DCE/DTE and INVERT inputs switch the port's mode of operation (Table 1). The MXL1543 and MXL1544/MAX3175 can be connected for either DTE or DCE operation in one of two ways: a dedicated DTE or DCE port with an appropriate gender connector or a port with a connector that can be configured for DTE or DCE operation by rerouting the signals to the MXL1543 and MXL1544/MAX3175 using
a dedicated DTE cable or dedicated DCE cable. The interface mode is selected by logic outputs from the controller or from jumpers to either VCC or GND on the mode select pins. A dedicated DCE port using a DB-25 female connector is shown in Figure 17. Figure 18 illustrates a dedicated DTE port using a DB-25 male connector.
14
______________________________________________________________________________________
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
Table 1. Mode Select Table
PROTOCOL Not Used (Default V.11) RS-530A RS-530 X.21 V.35 RS-449/V.36 V.28/RS-232 No Cable Not Used (Default V.11) RS-530A RS-530 X.21 V.35 RS-449/V.36 V.28/RS-232 No Cable Not Used (Default V.11) RS-530A RS-530 X.21 V.35 RS-449/V.36 V.28/RS-232 No Cable Not Used (Default V.11) RS-530A RS-530 X.21 V.35 RS-449/V.36 V.28/RS-232 No Cable M2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 M1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 M0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 DCE/ DTE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 INVERT 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 T1 V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z T2 V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z T3 Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z R1 V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z R2 V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z V.11 V.10 V.11 V.11 V.28 V.11 V.28 Z R3 V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z V.11 V.11 V.11 V.11 V.28 V.11 V.28 Z T4 Z Z Z Z Z Z Z Z V.10 V.10 V.10 V.10 V.28 V.10 V.28 Z V.10 V.10 V.10 V.10 V.28 V.10 V.28 Z Z Z Z Z Z Z Z Z R4 V.10 V.10 V.10 V.10 V.28 V.10 V.28 Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z V.10 V.10 V.10 V.10 V.28 V.10 V.28 Z
______________________________________________________________________________________
15
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
C6 C7 C8 100pF 100pF 100pF
3 VCC 5V 14 3 C3 4.7F C1 1F C4 1F DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC 5 6 7 DTE_TXC/DCE_TXC DTE_RXC/DCE_SCTE DTE_RXD/DCE_TXD 8 9 10 D1 D2 D3 R1 R2 R3 20 19 18 17 16 15 1 2 4 CHARGE PUMP 28 27 26 25 24 23 22 21 C2 1F 2 C5 4.7F C13 1F VCC
8
11
12 13 MXL1344A
LATCH DCE/DTE M2 M1
21
C12 1F
54
67
9 10 16 15 18 17 19 20 22 23 24 1 DTE 2 TXD A 14 TXD B 24 SCTE A 11 SCTE B 15 12 17 9 3 16 7 DCE RXD A RXD B RXC A RXC B
M0
VEE
TXC A TXC B
TXC A TXC B
RXC A SCTE A RXC B SCTE B RXD A TXD A RXD B TXD B SG
11
M0 MXL1543 12 M1 13 M2 14 DCE/DTE
1
SHIELD
DB-25 CONNECTOR C9 1F C10 1F VCC 1 28 VCC VDD VEE GND 27 C11 1F
2
DTE_RTS/DCE_CTS DTE_DTR/DCE_DSR
3 4 5
D1 D2 D3 R1 R2 R3 R4 D4
26 25 24 23
4 RTS A 19 RTS B 20 DTR A 23 DTR B 8 DCD A 10 DCD B 6 DSR A 22 DSR B 5 CTS A 13 CTS B 18 LL A
CTS A CTS B DSR A DSR B
DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR DTE_CTS/DCE_RTS DTE_LL/DCE_LL
6 7 8 10 9
22 21 20 19 18 17 16
DCD A DCD B DTR A DTR B RTS A RTS B LL A
MXL1544 M0 MAX3175 12 M1 15 13 INVERT M2 14 DCE/DTE 11 INVERT DCE/DTE M2 M1 M0
Figure 16. Controller-Selectable Multiprotocol DCE/DTE Port with DB-25 Connector 16 ______________________________________________________________________________________
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
C6 C7 C8 100pF 100pF 100pF
3 VCC 5V 14 3 C3 4.7F C1 1F C4 1F RXD RXC 5 6 7 TXC SCTE TXD 8 9 10 D1 D2 D3 R1 R2 R3 20 19 18 17 16 15 1 2 4 CHARGE PUMP 28 27 26 25 24 23 22 21 C2 1F 2 C5 4.7F C13 1F VCC
8
11
12 13 MXL1344A
LATCH DCE/DTE M2 M1
21
C12 1F
54
67
9 10 16 15 18 17 19 20 22 23 24 1 VCC
M0
VEE
3 RXD A (104) 16 RXD B 17 RXC A (115) 9 RXC B 15 TXC A (114) 12 TXC B 24 SCTE A (113) 11 SCTE B 2 TXD A (103) 14 TXD B 7 SGND (102)
M0 MXL1543 12 M1 13 M2 14 NC DCE/DTE
11
1
SHIELD (101)
C9 1F C10 1F
VCC 1 28 VCC VDD VEE GND 27 C11 1F
DB-25 FEMALE CONNECTOR
2
CTS DSR
3 4 5
D1 D2 D3 R1 R2 R3 R4 D4
26 25 24 23
5 CTS A (106) 13 CTS B 6 DSR A (107) 22 DSR B 8 DCD A (109) 10 DCD B 20 DTR A (108) 23 DTR B 4 RTS A (105) 19 RTS B 18 LL A (141)
DCD DTR RTS LL
6 7 8 10 9
22 21 20 19 18 17 16
MXL1544 M0 MAX3175 12 M1 15 INVERT 13 M2 14 NC DCE/DTE 11 INVERT M2 M1 M0
Figure 17. Controller-Selectable DCE Port with DB-25 Connector ______________________________________________________________________________________ 17
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
C6 C7 C8 100pF 100pF 100pF
3 VCC 5V 14 3 C3 4.7F C1 1F C4 1F TXD SCTE 5 6 7 TXC RXC RXD 8 9 10 D1 D2 D3 R1 R2 R3 20 19 18 17 16 15 1 2 4 CHARGE PUMP 28 27 26 25 24 23 22 21 C2 1F 2 C5 4.7F C13 1F VCC
8
11
12 13 MXL1344A
LATCH DCE/DTE M2 M1
21
C12 1F
54
67
9 10 16 15 18 17 19 20 22 23 24 1 2 TXD A (103) 14 TXD B 24 SCTE A (113) 11 SCTE B 15 12 17 9 3 16 7
M0
VEE
TXC A (114) TXC B RXC A (115) RXC B RXD A (104) RXD B SG
11
M0 MXL1543 12 M1 13 M2 14 DCE/DTE
1
SHIELD
DB-25 MALE CONNECTOR C9 1F C10 1F VCC 1 28 VCC VDD VEE GND 27 C11 1F
2
RTS DTR
3 4 5
D1 D2 D3 R1 R2 R3 R4 D4
26 25 24 23
4 RTS A (105) 19 RTS B 20 DTR A (108) 23 DTR B 8 DCD A (109) 10 DCD B 6 DSR A (107) 22 DSR B 5 CTS A (106) 13 CTS B 18 LL A (141)
DCD DSR CTS LL
6 7 8 10 9
22 21 20 19 18 17 16
MXL1544 M0 MAX3175 12 15 M1 INVERT 13 M2 14 DCE/DTE 11 INVERT M2 M1 M0
Figure 18. Controller-Selectable Multiprotocol DTE Port with DB-25 Connector 18 ______________________________________________________________________________________
+5V Multiprotocol, Software-Selectable Control Transceivers
Chip Information
TRANSISTOR COUNT: 2348 PROCESS: BiCMOS
TOP VIEW
VCC 1 VDD 2 T1IN 3 T2IN 4 T3IN 5 R1OUT 6 R2OUT 7 R3OUT 8 T4IN 9 R4OUT 10 M0 11 M1 12 M2 13 DCE/DTE 14 28 VEE 27 GND 26 T1OUTA 25 T1OUTB 24 T2OUTA
Pin Configuration
MXL1544/MAX3175
MXL1544 MAX3175
23 T2OUTB 22 T3OUTA/R1INA 21 T3OUTB/R1INB 20 R2INA 19 R2INB 18 R3INA 17 R3INB 16 T4OUTA/R4INA 15 INVERT
SSOP
______________________________________________________________________________________
19
+5V Multiprotocol, Software-Selectable Control Transceivers MXL1544/MAX3175
Package Information
SSOP.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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