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19-1901; Rev 0; 2/01
460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX
General Description
The MAX3311/MAX3313 are low-power, +5V EIA/TIA232-compatible transceivers. Both devices have one transmitter and one receiver. The transceivers have a proprietary low-dropout transmitter output stage enabling RS-232-compatible operation from a +5V supply with a single inverting charge pump. These devices require only three 0.1F capacitors and will run at data rates up to 460kbps while maintaining RS-232-compatible output levels. The MAX3311 features a 1A shutdown mode. In shutdown the device turns off the charge pump, pulls V- to ground, and the transmitter output is disabled. The MAX3313 features an INVALID output that asserts high when an active RS-232 cable signal is connected, signaling to the host that a peripheral is connected to the communication port. o INVALID Output (MAX3313) o Receiver Active in Shutdown (MAX3311) o Single Transceiver (1Tx/1Rx) in 10-Pin MAX o RS-232-Compatible Operation
Features
o 1A Low-Power Shutdown (MAX3311)
MAX3311/MAX3313
Ordering Information ________________________Applications
Digital Cameras PDAs GPS POS Telecommunications Handy Terminals Set-Top Boxes
+5V CBYPASS 0.1F 9 C1 0.1F C1+ 1 VCC V8 C2 0.1F C1-
PART MAX3311CUB MAX3311EUB MAX3313CUB MAX3313EUB
TEMP. RANGE 0C to +70C -40C to +85C 0C to +70C -40C to +85C
PIN-PACKAGE 10 MAX 10 MAX 10 MAX 10 MAX
Typical Operating Circuit
Pin Configurations
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TOP VIEW
VCC 1 C1SHDN TIN ROUT 2 3 4 5 10 GND 9 C1+
MAX3311 MAX3313
TOUT 7
4 TIN
MAX3311
5 ROUT
RIN 6 5k
8 7 6
VTOUT RIN
SHDN (MAX3311) 3 INVALID (MAX3313) GND 10 CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.
MAX
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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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.
460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX MAX3311/MAX3313
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V V- to GND .................................................................+0.3V to -7V VCC + | V-|.............................................................................+13V Input Voltages TIN, SHDN to GND .................................................-0.3V to +6V RIN to GND ........................................................................25V Output Voltages TOUT to GND..................................................................13.2V ROUT, INVALID to GND ..........................-0.3V to (VCC + 0.3V) Short-Circuit Duration TOUT to GND ...........................................................Continuous Continuous Power Dissipation 10-Pin MAX (derate 5.6mW/C above +70C) .............444mW Operating Temperature Ranges MAX331_CUB .......................................................0C to +70C MAX331_EUB ....................................................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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, C1 and C2 = 0.1F, TA = TMIN to TMAX. Typical values are at TA = +25C.)
PARAMETER DC CHARACTERISTICS Supply Operation Range Supply Current Shutdown Supply Current LOGIC INPUTS (TIN, SHDN) Input Logic Threshold Low Input Logic Threshold High Transmitter Input Hysteresis Input Leakage Current RECEIVER OUTPUT Output Voltage Low Output Voltage High INVALID OUTPUT (MAX3313 ONLY) Receiver Input Threshold to INVALID Output High Receiver Input Threshold to INVALID Output Low INVALID Output Low INVALID Output High Receiver Positive or Negative Threshold to INVALID High Receiver Positive or Negative Threshold to INVALID Low VOL VOH Figure 5, positive threshold Figure 5, negative threshold Figure 5 IOUT = 1.6mA IOUT = -1.0mA Figure 5 Figure 5 VCC - 0.6 0.1 30 -2.7 -0.3 0.3 0.4 2.7 V V V V s s VOL VOH IOUT = 1.6mA IOUT = -1.0mA VCC 0.6 VCC 0.1 0.4 V V VIL VIH 0.5 0.01 1 0.8 2.4 V V V A VCC SHDN = VCC, no load SHDN = GND (MAX3311 only) 4.5 5 100 1 5.5 250 10 V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
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460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, C1 and C2 = 0.1F, TA = TMIN to TMAX. Typical values are at TA = +25C.)
PARAMETER RECEIVER INPUT Input Threshold Low Input Threshold High Input Hysteresis Input Resistance TRANSMITTER OUTPUT Output Voltage Swing Output Resistance (Note 1) Output Short-Circuit Current Output Leakage Current VOUT = 12V, transmitter disabled Transmitter output loaded with 3k to ground VCC = 0, transmitter output = 2V 3.7 300 60 25 V mA A VIL VIH 0.5 5 0.8 2.4 V V V k SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3311/MAX3313
Note 1: Not tested--guaranteed by design.
TIMING CHARACTERISTICS
(VCC = +5V, C1 and C2 = 0.1F, TA = TMIN to TMAX. Typical values are at TA = +25C.)
PARAMETER Maximum Data Rate Receiver Propagation Delay Transmitter Skew Receiver Skew Transition Region Slew Rate RL = 3k to 7k, CL = 150pF to 1000pF, measured from +3V to -3V or from -3V to +3V tPLH, tPHL SYMBOL CONDITIONS RL = 3k, CL = 1000pF Receiver input to receiver output CL = 150pF MIN 460 0.15 100 50 11 TYP MAX UNITS kbps s ns ns V/s
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460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX MAX3311/MAX3313
Typical Operating Characteristics
(VCC = +5V, 0.1F capacitors, transmitter loaded with 3k and CL, TA = +25C, unless otherwise noted.)
SLEW RATE vs. LOAD CAPACITANCE
MAX3311/13 toc01
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3311/13 toc02
SUPPLY CURRENT vs. LOAD CAPACITANCE
460kbps 250kbps 10 8 6 4 2 0 20kbps 120kbps
MAX3311/13 toc03
14 250 kbps DATA RATE 12 SLEW RATE (V/s) 10 8 6 4 2 0 0 500 1000 1500 2000 2500 -SLEW +SLEW
6 TRANSMITTER OUTPUT VOLTAGE (V) 5 4 3 2 1 0 -1 -2 -3 -4 -5 460kbps/250kbps/120kbps 460kbps/250kbps/120kbps
14 12 SUPPLY CURRENT (mA)
3000
0
500
1000
1500
2000
2500
3000
0
500
1000
1500
2000
2500
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
Pin Description
PIN MAX3311 1 2 3 -- 4 5 6 7 8 9 10 MAX3313 1 2 -- 3 4 5 6 7 8 9 10 NAME VCC C1SHDN INVALID TIN ROUT RIN TOUT VC1+ GND FUNCTION +5V External Power Supply. Decouple with a 0.1F capacitor to ground. Negative Terminal of the Voltage Inverter Charge-Pump Capacitor Shutdown Active-Low (0 = off, 1 = on) Valid Signal Detector Output, Active-Low. A logic high indicates that a valid RS-232 level is present on the receiver input. TTL/CMOS Transmitter Input TTL/CMOS Receiver Output RS-232 Receiver Input RS-232-Compatible Transmitter Output -4.3V generated by the charge pump. Connect a 0.1F capacitor to ground. Positive Terminal of the Voltage Inverter Charge-Pump Capacitor Ground
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460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX
Detailed Description
Single Charge-Pump Voltage Converter
The MAX3311/MAX3313 internal power supply has a single inverting charge pump that provides a negative voltage from a single +5V supply. The charge pump operates in a discontinuous mode and requires a flying capacitor (C1) and a reservoir capacitor (C2) to generate the V- supply. factor of 2) reduces power consumption. C2 can be increased without changing C1's value. However, do not increase C1's value without also increasing the value of C2 and CBYPASS to maintain the proper ratios (C1 to the other capacitors). When using the minimum 0.1F capacitors, make sure the capacitance does not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor's equivalent series resistance (ESR) usually rises at low temperatures and influences the amount of ripple on V-. To reduce the output impedance at V-, use larger capacitors (up to 10F). Bypass VCC to ground with at least 0.1F. In applications sensitive to power-supply noise generated by the charge pump, decouple VCC to ground with a capacitor the same size as (or larger than) charge-pump capacitors C1 and C2.
MAX3311/MAX3313
RS-232-Compatible Driver
The transmitter is an inverting level translator that converts CMOS-logic levels to EIA/TIA-232-compatible levels. It guarantees data rates up to 460kbps with worst-case loads of 3k in parallel with 1000pF. When SHDN is driven low, the transmitter is disabled and put into three state. The transmitter input does not have an internal pullup resistor.
RS-232 Receiver
The MAX3311/MAX3313 receiver converts RS-232 signals to CMOS-logic output levels. The MAX3311 receiver will remain active during shutdown mode. The MAX3313 INVALID indicates when an RS-232 signal is present at the receiver input, and therefore when the port is in use. The MAX3313 INVALID output is pulled low when no valid RS-232 signal level is detected on the receiver input.
Transmitter Output when Exiting Shutdown
Figure 1 shows the transmitter output when exiting shutdown mode. The transmitter is loaded with 3k in parallel with 1000pF. The transmitter output displays no ringing or undesirable transients as the MAX3311 comes out of shutdown. Note that the transmitter is enabled only when the magnitude of V- exceeds approximately -3V.
MAX3311 Shutdown Mode
In shutdown mode, the charge pump is turned off, V- is pulled to ground, and the transmitter output is disabled (Table 1). This reduces supply current typically to 1A. The time required to exit shutdown is typically less than 100s.
Applications Information
Capacitor Selection
The capacitor type used for C1 and C2 is not critical for proper operation; either polarized or nonpolarized capacitors are acceptable. If polarized capacitors are used, connect polarity as shown in the Typical Operating Circuit. The charge pump requires 0.1F capacitors. Increasing the capacitor values (e.g., by a
5V/div 0 TIN = GND
SHDN
1.5V/div 0
TOUT
TIN = VCC
Table 1. MAX3311 Shutdown Logic Truth Table
SHDN L H TRANSMITTER OUTPUT High Z Active RECEIVER OUTPUT Active Active CHARGE PUMP Inactive Active
10s/div
Figure 1. Transmitter Output when Exiting Shutdown or Powering Up
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460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX MAX3311/MAX3313
+5V 0.1F VCC
C1+ C1 C1-
VTIN
C2
MAX3311 MAX3313
TOUT
TOUT
TIN
ROUT
RIN 5k
ROUT
1000pF
5s/div
GND
Figure 3. Loopback Test Results at 120kbps
Figure 2. Loopback Test Circuit
TIN
INVALID HIGH +2.7V RECEIVER INPUT LEVELS INDETERMINATE +0.3V 0 -0.3V INDETERMINATE -2.7V INVALID HIGH INVALID LOW
TOUT
ROUT
2s/div
Figure 4. Loopback Test Results at 250kbps
Figure 5. Receiver Positive/Negative Thresholds for INVALID
High Data Rates
The MAX3311/MAX3313 maintain RS-232-compatible transmitter output voltage (3.7V minimum) even at high data rates. Figure 2 shows a transmitter loopback test circuit. Figure 3 shows the loopback test result at 120kbps, and Figure 4 shows the same test at 250kbps.
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460kbps, 1A Supply Current, RS-232-Compatible Transceivers in MAX
Chip Information
TRANSISTOR COUNT: 278
Pin Configurations (continued)
MAX3311/MAX3313
VCC 1 C1INVALID TIN ROUT 2 3 4 5
10 GND
MAX3313
9 8 7 6
C1+ VTOUT RIN
MAX
Package Information
10LUMAX.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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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