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19-1696; Rev 0; 4/00
460kbps, 1A, RS-232-Compatible Transceiver
General Description
The MAX3314 is a 5V powered EIA/TIA-232-compatible interface. It has one transmitter and one receiver in a flow-through architecture. The transmitter has a lowdropout output stage providing minimum RS-232-compatible 3.7V output levels while driving 3k and 1000pf at 460kbps. Both +5V and -5V are supplied externally. The MAX3314 has a SHDN function that reduces supply current to 1A. The transmitter is disabled and put into 3-state mode while the receiver remains active. The MAX3314 is available in 8-pin MAX and SO packages. o 30A Operating Supply Current o 460kbps (min) Data Rate o 8-Pin MAX Package o RS-232-Compatible Levels
Features
o 1A Low-Power Shutdown with Receiver Active
MAX3314
Ordering Information
PART MAX3314CUA MAX3314CSA MAX3314EUA MAX3314ESA 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 2 7 0.1F
Pin Configuration
TOP VIEW
4 TIN
MAX3314
V-
-5V
TOUT 5
VCC 1 SHDN 2
8 7
GND VRIN TOUT
3 ROUT
RIN 6 5k
MAX3314
ROUT 3 6 5 TIN 4 GND 8
MAX/SO
CAPACITORS MAY BE POLARIZED OR UNPOLARIZED.
________________________________________________________________ MAXIM Integrated Products
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460kbps, 1A, RS-232-Compatible Transceiver MAX3314
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 MAX3314C_A.....................................................0C to +70C MAX3314E_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, unless otherwise noted. 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 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 SYMBOL CONDITIONS MIN TYP MAX UNITS
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
Note 1: Not tested--guaranteed by design. 2 _______________________________________________________________________________________
460kbps, 1A, RS-232-Compatible Transceiver
TIMING CHARACTERISTICS
(VCC = +5V, V- = -5V, TA = TMIN to TMAX, unless otherwise noted. 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, CL = 150pF to 1000pF, measured from +3V to -3V or from -3V to +3V SYMBOL CONDITIONS RL = 3k, CL =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
MAX3314
Typical Operating Characteristics
(VCC = +5V, V- = -5V, 250kbps data rate, transmitter loaded with 3k and CL, TA = +25C, unless otherwise noted.)
SLEW RATE vs. LOAD CAPACITANCE
MAX3314-01
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 500 1000 1500 2000 2500 3000
MAX3314-02
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 0 500 1000 1500 2000 2500 3000 20kbps 120kbps 460kbps 250kbps
MAX3314-03
9 8 7 SLEW RATE (V/us) 6 5 4 3 2 1 0 0 500 1000 1500 2000 2500 SLEW+ SLEW-
5.5
TRANSMITTER OUTPUT VOLTAGE (V)
20kbps/120kbps
460kbps/250kbps
20kbps/120kbps
460kbps/250kbps
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME VCC SHDN ROUT TIN TOUT RIN VGND FUNCTION 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 5% External Power Supply. Decouple with a 0.1F capacitor to ground. Ground
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460kbps, 1A, RS-232-Compatible Transceiver MAX3314
Detailed Description
RS-232-Compatible Drivers
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 3-state mode. The transmitter input does not have a pull-up resistor. Connect to ground if unused.
5V/div 0 TIN = GND SHDN
1.5V/div 0
TOUT
RS-232-Compatible Receivers
The MAX3314's receiver converts RS-232 signals to CMOS-logic output levels. The receiver is rated to signals up to 25V. The MAX3314's receiver will remain active during shutdown mode.
TIN = VCC
1s/div
MAX3314 Shutdown Mode
In shutdown mode, the transmitter output is put into high impedance. This reduces the supply current to 1A. The time required to exit shutdown is less than 2.5s. Table 1 is the shutdown logic truth table.
Figure 1. Transmitter Output When Exiting Shutdown or Powering Up
+5V 0.1F VCC SHDN V0.1F TIN TOUT -5V
Table 1. Shutdown Logic Truth Table
SHDN L H TRANSMITTER OUTPUT High-Z Active RECEIVER OUTPUT Active Active
MAX3314
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.
ROUT
RIN 5k
1000pF
GND
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 MAX3314 comes out of shutdown. Note that the transmitter is enabled only when the magnitude of V- exceeds approximately -3V.
CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.
Figure 2. Loopback Test Circuit
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.
High Data Rates
The MAX3314 maintains minimum RS-232-compatible 3.7V transmitter output voltage even at high data rates.
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Chip Information
TRANSISTOR COUNT: 128
_______________________________________________________________________________________
460kbps, 1A, RS-232-Compatible Transceiver MAX3314
TIN
TIN
TOUT
TOUT
ROUT
ROUT
5s/div
2s/div
Figure 3. Loopback Test Results at 120kbps
Figure 4. Loopback Test Results at 250kbps
Package Information
_______________________________________________________________________________________
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460kbps, 1A, RS-232-Compatible Transceiver MAX3314
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.
6 _____________________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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