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19-1696; Rev 0; 4/00
15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver
General Description
The MAX3314E is a 5V-powered EIA/TIA-232-compatible interface. It has one transmitter and one receiver in a flow-through architecture. The transmitter output and the receiver input are protected to 15kV using IEC 1000-4-2 Air-Gap Discharge, 8kV using IEC 1000-4-2 Contact Discharge, and 15kV using the Human Body Model. The transmitter has a low-dropout output stage providing minimum RS-232-compatible 3.7V output levels while driving 3k and 1000pF at 460kbps. Both +5V and -5V must be supplied externally. The MAX3314E has a SHDN function that reduces supply current to 1A. The transmitter is disabled and put into tristate while the receiver remains active. The MAX3314E is available in 8-pin MAX and SO packages.
Features
o ESD Protection for RS-232 I/O Pins 15kV--Human Body Model 8kV--IEC 1000-4-2 Contact Discharge 15kV--IEC 1000-4-2 Air-Gap Discharge o 1A Low-Power Shutdown with Receiver Active o 30A Operating Supply Current o 460kbps Guaranteed Data Rate o 8-Pin MAX Package o 3.7V RS-232-Compatible Levels
MAX3314E
Ordering Information
PART MAX3314ECUA MAX3314ECSA MAX3314EEUA MAX3314EESA TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 8 MAX 8 SO 8 MAX 8 SO
________________________Applications
Digital Cameras PDA GPS POS Telecommunications Handy-Terminals Set-Top Boxes
Typical Operating Circuit
+5V CBYPASS 0.1F 1 VCC SHDN V2 7 0.1F 4 TIN TOUT 5
Pin Configuration
TOP VIEW
MAX3314E
-5V
VCC 1 SHDN 2
8 7
GND VRIN TOUT
MAX3314E
ROUT 3 6 5 TIN 4
3 ROUT
RIN 6 5k
MAX/SO
GND 8
CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.
________________________________________________________________ Maxim Integrated Products
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver MAX3314E
ABSOLUTE MAXIMUM RATINGS
VCC to GND .............................................................-0.3V to +6V V- to GND ...............................................................+0.3V to -6V Input Voltages TIN, SHDN to GND ...............................................-0.3V to +6V RIN to GND ......................................................................25V Output Voltages TOUT to GND................................................................13.2V ROUT ....................................................-0.3V to (VCC + 0.3V) Short-Circuit Duration TOUT to GND .........................................................Continuous Continuous Power Dissipation 8-Pin MAX (derate 4.1mW/C above +70C) ............300mW 8-Pin SO (derate 5.88mW/C above +70C)...............471mW Operating Temperature Ranges MAX3314EC_A ..................................................0C to +70C MAX3314EE_A................................................-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, V- = -5V, TA = TMIN to TMAX. Typical values are at TA = +25C.)
PARAMETER DC CHARACTERISTICS Positive Supply Operating Range Negative Supply Operating Range Positive Supply Current Negative 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 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 Human Body Model ESD-Protection Voltage IEC 1000-4-2 Air-Gap Discharge IEC 1000-4-2 Contact Discharge 15 15 8 kV ESD PROTECTION (Transmitter Output, Receiver Input) Transmitter output loaded with 3k to ground VCC = V- = 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 VOL VOH IOUT = 1.6mA IOUT = -1.0mA VCC - 0.3 VCC - 0.1 0.4 V V VIL VIH 0.5 0.01 0.8 2.4 V V V A VCC VSHDN = VCC, no load SHDN = VCC, no load SHDN = GND 4.75 -4.75 5 -5 30 15 1 5.25 -5.25 100 30 10 V V A A A SYMBOL CONDITIONS MIN TYP MAX UNITS
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver
TIMING CHARACTERISTICS
(VCC = +5V, V- = -5V, TA = TMIN to TMAX. Typical values are at TA = +25C.)
PARAMETER Maximum Data Rate TPLH Receiver Propagation Delay TPHL Transmitter Skew Receiver Skew Transition Region Slew Rate RL = 3k to 7k, C L = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V SYMBOL CONDITIONS RL = 3k, C L = 1000pF, transmitter switching Receiver input to receiver output, CL = 150pF Receiver input to receiver output, CL = 150pF MIN 460 0.15 s 0.15 100 50 8 ns ns V/s TYP MAX UNITS kbps
MAX3314E
Note 1: Not tested, guaranteed by design.
Typical Operating Characteristics
(VCC = +5V, V- = -5V, 250kbps data rate, transmitter loaded with 3k and CL, TA = +25C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3314E-01 MAX3314E-02
SLEW RATE vs. LOAD CAPACITANCE
9 8 7 SLEW RATE (V/s) 6 5 4 3 2 1 0 0 500 1000 1500 2000 2500 3000 LOAD CAPACITANCE (pF) +SLEW -SLEW 6 TRANSMITTER OUTPUT VOLTAGE (V) 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0
SUPPLY CURRENT vs. LOAD CAPACITANCE
5.0 4.5 SUPPLY CURRENT (mA) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 20kbps 250kbps 120kbps 460kbps
MAX3314E-03
5.5
20kbps/120kbps
460kbps/250kbps
20kbps/120kbps
460kbps/250kbps
500
1000
1500
2000
2500
3000
0
500
1000
1500
2000
2500
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver MAX3314E
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME VCC SHDN ROUT TIN TOUT RIN VGND FUNCTION +5V 5% External Power Supply. Decouple with a 0.1F capacitor to ground. Shutdown, Active low (0 = off, 1 = on). TTL/CMOS Receiver Output TTL/CMOS Transmitter Input RS-232-Compatible Transmitter Output RS-232-Compatible Receiver Input -5V 5% External Power Supply. Decouple with a 0.1F capacitor to ground. Ground
Detailed Description
RS-232-Compatible Drivers
The transmitter is an inverting level translator that converts CMOS-logic levels to 3.7V 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 tristate. The transmitter input does not have a pullup resistor. Connect to ground if unused.
parallel with 1000pF. The transmitter output displays no ringing or undesirable transients as the MAX3314E comes out of shutdown.
High Data Rates
The MAX3314E maintains minimum RS-232-compatible 3.7V transmitter output voltage 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.
RS-232-Compatible Receivers
The MAX3314E's receiver converts RS-232 signals to CMOS-logic output levels. The receiver is rated to receive signals to 25V. It will remain active during shutdown mode.
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 MAX3314E driver outputs and receiver inputs have extra protection against static discharge. Maxim's engineers have developed state-of-the-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 the following limits: * 15kV using the Human Body Model * 8kV using the Contact Discharge method specified in IEC 1000-4-2 * 15kV using the IEC 1000-4-2 Air-Gap method
MAX3314E Shutdown Mode
In shutdown mode, the transmitter output is put into high impedance (Table 1). This reduces supply current to 1A. The time required to exit shutdown is less than 2.5s.
Applications Information
Capacitor Selection
The capacitor type used 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. Bypass VCC and V- to ground with at least 0.1F.
Transmitter Outputs When Exiting Shutdown
Figure 1 shows the transmitter output when exiting shutdown mode. The transmitter is loaded with 3k in
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver MAX3314E
Table 1. Shutdown Logic Truth Table
SHDN L H TRANSMITTER OUTPUT High Z Active RECEIVER OUTPUT Active Active
TOUT TIN
ROUT 5V/div 0 TIN = GND 5s/div 1.5V/div 0 SHDN
TOUT
Figure 3. Loopback Test Result at 120kbps
TIN = VCC
TIN
1s/div
Figure 1. Transmitter Outputs When Exiting Shutdown or Powering Up
TOUT
+5V 0.1F VCC SHDN V0.1F TIN TOUT -5V
2s/div
ROUT
MAX3314E
Figure 4. Loopback Test Result at 250kbps
ESD Test Conditions
ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.
1000pF
ROUT
RIN 5k
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.
GND
Figure 2. Loopback Test Circuit
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver MAX3314E
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500 DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR Cs 150pF RD 330 DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST
Figure 5. Human Body ESD Test Model
Figure 7. IEC 1000-4-2 ESD Test Model
I
IP 100% 90% AMPERES
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
100% 90%
10% 0 0 tRL TIME tDL CURRENT WAVEFORM
I PEAK
36.8%
Figure 6. Human Body Current Waveform
10% t r = 0.7ns to 1ns t 60ns
30ns
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to ICs. The MAX3314E helps design equipment that meets Level 4 (the highest level) of IEC 1000-4-2 without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2 because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7 shows the IEC 1000-4-2 model, and Figure 8 shows the current waveform for the 8kV, IEC 1000-4-2, Level 4, ESD Contact Discharge test. The Air-Gap test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.
Figure 8. IEC 1000-4-2 ESD Generator Current Waveform
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.
Chip Information
TRANSISTOR COUNT: 128
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
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver
Package Information
8LUMAXD.EPS
MAX3314E
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15kV ESD-Protected, 460kbps, 1A, RS-232-Compatible Transceiver MAX3314E
Package Information (continued)
SOICN.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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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