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19-1910; Rev 0; 1/01
15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX
General Description
The MAX3311E/MAX3313E are low-power, 5V EIA/TIA232-compatible transceivers. All transmitter outputs and receiver inputs are protected to 15kV using the Human Body Model, making these devices ideal for applications where more robust transceivers are required. Both devices have one transmitter and one receiver. The transmitters have a proprietary low-dropout transmitter output stage enabling RS-232-compatible operation from a +5V supply with a single inverting charge pump. These transceivers require only three 0.1F capacitors and will run at data rates up to 460kbps while maintaining RS-232-compatible output levels. The MAX3311E 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 MAX3313E 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. 15kV--Human Body Model o 1A Low-Power Shutdown (MAX3311E) o INVALID Output (MAX3313E) o Receiver Active in Shutdown (MAX3311E) o Single Transceiver (1Tx/1Rx) in 10-Pin MAX Package
Features
o ESD Protection for RS-232-Compatible I/O Pins
MAX3311E/MAX3313E
Ordering Information
PART MAX3311ECUB MAX3311EEUB MAX3313ECUB MAX3313EEUB TEMP. RANGE 0C to +70C -40C to +85C 0C to +70C -40C to +85C PIN-PACKAGE 10 MAX 10 MAX 10 MAX 10 MAX
________________________Applications
Digital Cameras PDAs GPS POS Telecommunications Handy Terminals Set-Top Boxes
C1 0.1F +5V CBYPASS 0.1F 9 C1+ 1 VCC V8 C2 0.1F C1-
Typical Operating Circuit
2
Pin Configurations
4 TIN
MAX3311E MAX3313E
TOUT 7
TOP VIEW
5 ROUT VCC 1 C1SHDN TIN ROUT 2 3 4 5 10 GND 5k 9 C1+ VTOUT RIN SHDN (MAX3311E) 3 INVALID (MAX3313E) GND 10 CAPACITORS MAY BE POLARIZED OR NONPOLARIZED. RIN 6
MAX3311E
8 7 6
MAX
Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
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.
15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX MAX3311E/MAX3313E
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_ECUB .................................................0C to +70C MAX331_EEUB ..............................................-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 (MAX3313E 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 Thresholds to INVALID High Receiver Positive or Negative Threshold to INVALID Low VOL VOH Figure 7, positive threshold Figure 7, negative threshold Figure 7 IOUT = 1.6mA IOUT = -1.0mA Figure 7 Figure 7 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 (MAX3311E only) 4.5 5 100 1 5.5 250 10 V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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15kV ESD-Protected, 460kbps, 1A, 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 ESD-Protection Voltage VOUT = 12V, transmitter disabled Human Body Model 15 ESD PERFORMANCE (TRANSMITTER OUTPUT, RECEIVER INPUT) kV Transmitter output loaded with 3k to 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
MAX3311E/MAX3313E
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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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX MAX3311E/MAX3313E
Typical Operating Characteristics
(VCC = +5V, 0.1F capacitors, transmitter loaded with 3k and CL, TA = +25C, unless otherwise noted.)
SLEW RATE vs. LOAD CAPACITANCE
MAX3311E/13E-01
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V) 5 4 3 2 1 0 -1 -2 -3 -4 -5 460kbps/250kbps/120kbps 460kbps/250kbps/120kbps
MAX3311E/13E-02
SUPPLY CURRENT vs. LOAD CAPACITANCE
460kbps 250kbps 10 8 6 4 2 0 20kbps 120kbps
MAX3311E/13E-03
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
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 MAX3311E 1 2 3 -- 4 5 6 7 8 9 10 MAX3313E 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 15kV ESD-Protected, RS-232 Receiver Input 15kV ESD-Protected, 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
4
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX
Detailed Description
Single Charge-Pump Voltage Converter
The MAX3311E/MAX3313E 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. 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.
MAX3311E/MAX3313E
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 tri-state. The transmitter input does not have an internal pullup resistor.
RS-232 Receiver
The MAX3311E/MAX3313E receiver converts RS-232 signals to CMOS-logic output levels. The MAX3311E receiver will remain active during shutdown mode. The MAX3313E INVALID indicates when an RS-232 signal is present at the receiver input, and therefore when the port is in use. The MAX3313E 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 MAX3311E comes out of shutdown. Note that the transmitter is enabled only when the magnitude of V- exceeds approximately -3V.
High Data Rates
The MAX3311E/MAX3313E maintain RS-232-compatible 3.7V minimum transmitter output voltage even at
MAX3311E 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 less than 25ms.
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 factor of 2) reduces power consumption. C2 can be
5V/div 0 TIN = GND SHDN
1.5V/div 0
TOUT
TIN = VCC
Table 1. MAX3311E Shutdown Logic Truth Table
10s/div
SHDN L H
TRANSMITTER OUTPUT High Z Active
RECEIVER OUTPUT Active Active
CHARGE PUMP Inactive Active
Figure 1. Transmitter Output when Exiting Shutdown or Powering Up 5
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX MAX3311E/MAX3313E
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. and receiver inputs have extra protection against static discharge. Maxim's engineers have developed state-ofthe-art structures to protect these pins against ESD of 15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim's E versions keep working without latchup; whereas, competing products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the product family are characterized for protection to 15kV using the Human Body Model.
15kV ESD Protection
As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX3311E/MAX3313E driver outputs
+5V 0.1F VCC
ESD Test Conditions
C1+ VC2 C1-
C1
ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.
MAX3311E MAX3313E
TOUT
Human Body Model
Figure 5 shows the Human Body Model, and Figure 6 shows the current waveform it generates when discharged into low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k resistor.
1000pF
TIN
ROUT
RIN 5k
Machine Model
The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. Of course, all pins require this protection during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.
GND
Figure 2. Loopback Test Circuit
TIN
TIN
TOUT
TOUT
ROUT
ROUT
5s/div
2s/div
Figure 3. Loopback Test Results at 120kbps
Figure 4. Loopback Test Results at 250kbps
6
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST
Pin Configurations (continued)
MAX3311E/MAX3313E
Cs 100pF
STORAGE CAPACITOR
VCC 1 C1INVALID TIN ROUT 2 3 4 5
10 GND 9 C1+ VTOUT RIN
MAX3313E
8 7 6
Figure 5. Human Body ESD Test Model
MAX
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
Chip Information
TRANSISTOR COUNT: 278
tDL CURRENT WAVEFORM
Figure 6. Human Body Current Waveform
INVALID HIGH +2.7V RECEIVER INPUT LEVELS INDETERMINATE +0.3V 0 -0.3V INDETERMINATE -2.7V INVALID HIGH INVALID LOW
Figure 7. Receiver Positive/Negative Thresholds for INVALID
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceivers in MAX MAX3311E/MAX3313E
______________________________________________________________Pin Description
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.
8 _____________________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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