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19-1253; Rev 0; 8/97
3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset
_______________General Description
The MAX3320 combines a microprocessor (P) supervisory circuit with an RS-232 transceiver. The power-on reset performs a single function: it asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, staying asserted for at least 100ms after VCC rises above the reset threshold. The MAX3320 has an active-low RESET output, which is guaranteed to be in the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds suitable for operation with a variety of supply voltages are available. The MAX3320 transceivers have a proprietary lowdropout transmitter output stage, enabling true RS-232 performance with a dual charge pump powered from a +3V to +5.5V supply. The device requires only four small 0.1F external charge-pump capacitors, and is guaranteed to run at data rates of up to 250kbps. It comes in the space-saving 20-pin SSOP package.
____________________________Features
o Precise Monitoring of 5V and 3.3V PowerSupply Voltages: -- 100ms (min) Power-On RESET Pulse Width -- Power-Supply Transient Immunity -- Guaranteed RESET Valid to VCC = 1V o 4A Supply Current Achieved with AutoShutdown Plus o Receivers Always Active o Power-On Reset Always Active o 4A Low-Power Shutdown o 250kbps Guaranteed Data Rate
MAX3320A/B/L/T
________________________Applications
Palmtop Computers Portable/Battery-Powered Equipment Hand-Held Equipment Peripherals Printers
______________Ordering Information
PART* MAX3320_CAP MAX3320_EAP TEMP. RANGE 0C to +70C -40C to +85C PIN-PACKAGE 20 SSOP 20 SSOP
* This part offers a choice of reset threshold voltage. From the table below, select the suffix corresponding to the desired threshold and insert it into the blank to complete the part number.
__________________Pin Configuration
TOP VIEW
V+ 1 C2+ 2 C2- 3 V- 4 T1IN 5 T2IN 6 R1OUT 7 R2OUT 8 INVALID 9 RESET 10 20 C1+ 19 VCC 18 C1-
SUFFIX A B L T
RESET THRESHOLD (V) 4.25 2.85 4.63 3.08
MAX3320 MAXxxx
17 GND 16 T1OUT 15 T2OUT 14 R1IN 13 R2IN 12 FORCEON 11 FORCEOFF
Typical Operating Circuit appears at end of data sheet.
SSOP
AutoShutdown Plus is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
ABSOLUTE MAXIMUM RATINGS
Short-Circuit Duration VCC .............................................................................-0.3V to 6V T_OUT....................................................................Continuous V+ (Note 1) .................................................................-0.3V to 7V Continuous Power Dissipation (TA = +70C) V- (Note 1)...................................................................0.3V to -7V SSOP (derate 8.00mW/C above +70C) ....................640mW V+ + |V-| (Note 1) ...................................................................13V Input Voltages Operating Temperature Ranges T_IN, FORCEOFF, FORCEON ................................-0.3V to 6V MAX3320_CAP ...................................................0C to +70C R_IN.................................................................................25V MAX3320_EAP ................................................-40C to +85C Output Voltages Storage Temperature Range .............................-65C to +160C T_OUT ..........................................................................13.2V Lead Temperature (soldering, 10sec) .............................+300C R_OUT, INVALID, RESET.......................-0.3V to (VCC + 0.3V) Note 1: V+ and V- can have a magnitude of +7V (max), but their absolute 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 = 3V to 5.5V, C1-C4 = 0.1F (tested at 3.3V 10%), C1 = 0.047F, C2-C4 = 0.33F (tested at 5V 10%), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER DC CHARACTERISTICS Power-Supply Current Shutdown Supply Current AutoShutdown Plus Supply Current CONDITIONS No load, VCC = 3.3V or 5V, TA = +25C FORCEOFF = GND, TA = +25C All R_IN unconnected, FORCEON = GND, FORCEOFF = VCC, all T_IN = VCC or GND, TA = +25C MIN TYP 0.45 4.0 4.0 MAX 1.0 10 10 UNITS mA A A
LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low T_IN, FORCEON, FORCEOFF Input Logic Threshold High Input Leakage Current Input Hysteresis Output Voltage Low Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance INVALID OUTPUT Receiver Input Threshold to INVALID Output High Receiver Input Threshold to INVALID Output Low INVALID Output Voltage Low 2 Figure 3, positive threshold Figure 3, negative threshold Figure 3 IOUT = 1.6mA -2.7 -0.3 TA = +25C 3 VCC = 3.3V VCC = 5V VCC = 3.3V VCC = 5V T_IN, FORCEON, FORCEOFF T_IN, FORCEON, FORCEOFF T_IN, FORCEON, FORCEOFF IOUT = 1.6mA IOUT = -1mA VCC 0.6 -25 0.6 0.8 1.2 1.5 1.5 1.8 0.3 5 VCC = 3.3V VCC = 5V 2.0 2.4 0.01 250
0.8
V V
1.0 0.4
A mV V V
VCC 0.1 25
V V
2.4 2.4 7 2.7
V V k
V V V
0.3 0.4
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3V to 5.5V, C1-C4 = 0.1F (tested at 3.3V 10%), C1 = 0.047F, C2-C4 = 0.33F (tested at 5V 10%), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER INVALID Output Voltage High Receiver Positive or Negative Threshold to INVALID High Receiver Positive or Negative Threshold to INVALID Low Receiver or Transmitter Edge to Transmitters Enabled Receiver or Transmitter Edge to Shutdown TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current RESET OUTPUT RESET Operating Voltage Range MAX3320_C MAX3320_E MAX3320A RESET Threshold MAX3320B MAX3320L MAX3320T ISINK = 1.2mA, VCC = reset threshold, MAX3320B/T RESET Output Voltage ISINK = 3.2mA, VCC = reset threshold, MAX3320A/L ISINK = 50A, VCC > 1V, MAX3320_C ISINK = 100A, VCC > 1.2V, MAX3320_E 1.0 1.2 4.00 2.70 4.50 3.00 4.25 2.85 4.63 3.08 5.5 5.5 4.50 3.00 4.75 3.15 0.3 0.4 0.3 0.4 V V V All transmitter outputs loaded with 3k to ground VCC = V+ = V- = GND, VT_OUT = 2V T_OUT = GND, T_IN = VCC or GND VT_OUT = 12V, VCC = 0 to 5.5V, transmitters disabled 5.0 300 5.4 10M 35 60 25 V mA A IOUT = -1mA Figure 3 Figure 3 CONDITIONS MIN VCC - 0.6 0.1 90 TYP MAX UNITS V s s
MAX3320A/B/L/T
AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF = VCC) Figure 5 Figure 3 15 25 30 60 s sec
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
TIMING CHARACTERISTICS
(VCC = 3V to 5.5V, C1-C4 = 0.1F, C1-C4 = 0.1F (for 3.3V 10%), C1 = 0.047F, C2-C4 = 0.33F (tested at 5V 10%), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Maximum Data Rate Receiver Propagation Delay Transmitter Skew Receiver Skew CONDITIONS RL = 3k, CL = 1000pF, one transmitter switching R_IN to R_OUT, CL = 150pF tPHL tPLH MIN 250 0.3 0.3 100 200 6 4 40 100 280 30 V/s 30 s ms TYP MAX UNITS kbps s ns ns
| tPHL - tPLH | | tPHL - tPLH |
CL = 150pF to VCC = 3.3V, RL = 3k to 7k, 1000pf measured from +3V to -3V or -3V to CL = 150pF to +3V, TA = +25C 2500pf 100mV overdrive from reset threshold VCC = reset threshold
Transition-Region Slew Rate
VCC to RESET Delay RESET Active Timeout Period
__________________________________________Typical Operating Characteristics
(VCC = 3.3V, 250kbps data rate, C1-C4 = 0.1F, all transmitters loaded with 3k. Typical values are at TA = +25C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3320 TOC01
SLEW RATE vs. LOAD CAPACITANCE
MAX3320 TOC02
SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA
40 SUPPLY CURRENT (mA) 35 30 25 20 15 10 5 0 20kbps 120kbps ONE TRANSMITTER AT FULL DATA RATE INDICATED ONE TRANSMITTER AT 1/16 DATA RATE INDICATED 250kbps
MAX3320 TOC03
7.5 VT_OUT+ 5.0 OUTPUT VOLTAGE (V) 2.5 0 -2.5 -5.0 VT_OUT-7.5 0 1000 2000 3000 4000 ONE TRANSMITTER AT 250kbps ONE TRANSMITTER AT 15.6kbps LOAD = 3k + CL
12 10 SLEW RATE (V/us) 8 6 4 2 0 ONE TRANSMITTER AT 250kbps ONE TRANSMITTER AT 15.6kbps LOAD = 3k + CL 0 1000 2000 3000 4000 POSITIVE SLEW NEGATIVE SLEW
45
5000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset
____________________________Typical Operating Characteristics (continued)
(VCC = 3.3V, 250kbps data rate, C1-C4 = 0.1F, all transmitters loaded with 3k. Typical values are at TA = +25C, unless otherwise noted.)
MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE
MAXIMUM TRANSIENT DURATION (s)
MAX3320toc05
MAX3320A/B/L/T
NORMALIZED POWER-UP RESET DELAY vs. TEMPERATURE
1.030 POWER-UP RESET DELAY 1.020 1.010 1.000 0.990 0.980 0.970
MAX3320 TOC06
300 250 SHUTDOWN MODE 200 150 100 50 0 10 NOT IN SHUTDOWN MODE CBYPASS = 0.1F 100 RESET COMPARATOR OVERDRIVE (mV)
1.040
0.960 1000 -40 -20 0 20 40 60 80 TEMPERATURE (C)
______________________________________________________________Pin Description
PIN 1 2 3 4 5, 6 7, 8 9 10 11 12 13, 14 15, 16 17 18 19 20 NAME V+ C2+ C2VT_IN R_OUT INVALID RESET FORCEOFF FORCEON R_IN T_OUT GND C1VCC C1+ 5.5V generated by the charge pump Positive terminal of inverting charge-pump capacitor Negative terminal of inverting charge-pump capacitor -5.5V generated by the charge pump TTL/CMOS Transmitter Inputs (T1IN and T2IN) TTL/CMOS Receiver Outputs (R1OUT and R2OUT) Output of the Valid Signal Detector. Asserts when no valid RS-232 levels are present on any of the receiver inputs for 90s. RESET Output. RESET remains low while VCC is below the reset threshold, and for 280ms (max) after VCC rises above the reset threshold. Force-Off Input. Drive FORCEOFF low to shut down transmitters and on-board power supply. This overrides AutoShutdown Plus and FORCEON (Table 1). Force-On Input. Drive FORCEON high to override AutoShutdown Plus, keeping transmitters on (FORCEOFF must be high) (Table 1). RS-232 Receiver Inputs (R2IN and R1IN) RS-232 Transmitter Outputs (T2OUT and T1OUT) Ground Negative terminal of voltage-doubler charge-pump capacitor +3V to +5.5V Supply Voltage Positive terminal of voltage-doubler charge-pump capacitor 5 FUNCTION
_______________________________________________________________________________________
3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
Table 1. MAX3320 Output Control Truth Table
FORCEON X 1 0 0 FORCEOFF 0 1 1 1 AUTOSHUTDOWN PLUS* X X <30sec* >30sec* OPERATION STATUS Shutdown (forced off) Normal operation (forced on) Normal operation (AutoShutdown Plus) Shutdown (AutoShutdown Plus) T_OUT High-Z Active Active High-Z R_OUT Active Active Active Active
X = Don't Care *Time since last receiver or transmitter input activity
______________ Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3320's internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) while V CC remains in the 3V to 5.5V range. The charge pumps operate in discontinuous mode; they are enabled if the output voltages are less than 5.5V, and disabled if output voltages exceed 5.5V. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.
POWERMANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID
MAX3320
T1 T2 I/O CHIP WITH UART CPU RS-232 R1 R2
RS-232 Transmitters
The transmitters are inverting level translators that convert CMOS-logic levels to 5V EIA/TIA-232 levels. The MAX3320 transmitters guarantee a 250kbps data rate with worst-case loads of 3k in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLinkTM). Transmitters can be paralleled to drive multiple receivers. Figure 1 shows a complete system connection. When FORCEOFF is driven to ground, the transmitter's outputs become high impedance. When the AutoShutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30sec, the transmitters turn off and the outputs go into a highimpedance state, but the receivers remain active. When the power is off or the MAX3320 is shut down, outputs may be driven up to 12V. The transmitter inputs do not have pull-up resistors. Connect unused inputs to GND or VCC.
Laplink is a trademark of Traveling Software.
Figure 1. Interface Under Control of PMU
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels. All receivers have inverting outputs and are active in shutdown FORCEOFF (Table 1).
AutoShutdown Plus Mode
Maxim's AutoShutdown Plus feature, which operates when FORCEOFF is high and FORCEON is low, achieves a 4A supply current. When the MAX3320 senses no valid signal levels on all receiver and transmitter inputs for 30sec, the on-board power supply and drivers shut off,
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320 MAX3320A/B/L/T
reducing supply current to 4A. This occurs if the RS-232 cable is disconnected or the connected peripheral transmitters turn off. The system turns on again when a valid transition occurs at any RS-232 receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating system. The INVALID output is high when the receivers are active. Since INVALID indicates the receiver inputs' condition, it can be used in any mode (Figure 2). Tables 1 and 2 and Figure 2 summarize the MAX3320's operating modes. FORCEON and FORCEOFF override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is asserted, the IC enters AutoShutdown Plus mode and selects between these states automatically, based on the last receiver or transmitter input edge received. When shut down, the device's charge pumps turn off, V+ decays to VCC , V- decays to ground, and the transmitter outputs turn off (high impedance). The time required to exit shutdown is typically 25s (Figure 3a).
+0.3V
R_IN
-0.3V
90s TIMER R
INVALID
INVALID ASSERTED IF BOTH RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 90s.
Figure 2a. INVALID Functional Diagram, INVALID Low
+2.7V
R_IN
-2.7V
90s TIMER R
INVALID
INVALID DEASSERTED IF EITHER RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 90s.
Software-Controlled Shutdown
If direct software control is desired, use INVALID to indicate DTR or Ring Indicator signal. Connect FORCEOFF and FORCEON together to bypass the AutoShutdown Plus feature so the line acts like a SHDN input.
Figure 2b. INVALID Functional Diagram, INVALID High
EDGE DETECT
T_IN
FORCEOFF S 30sec TIMER
Power-On Reset
In addition to issuing a reset to the microprocessor (P) during power-up, power-down, and brownout conditions, the MAX3320 is relatively immune to shortduration, negative-going V CC transitions (glitches). Typically, a VCC transient that goes 100mV below the reset threshold and lasts 20s or less does not cause a reset pulse (see Typical Operating Characteristics). Additional bypass capacitance mounted as close as possible to the VCC pin provides additional transient immunity.
R_IN EDGE DETECT FORCEON
AUTOSHDN
R
Figure 2c. AutoShutdown Plus Logic
FORCEOFF
POWERDOWN*
Table 2. INVALID Truth Table
RS-232 SIGNAL PRESENT AT RECEIVER INPUT Yes No INVALID OUTPUT H L
FORCEON AUTOSHDN
* POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 2d. Power-Down Logic
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7
3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
INVALID REGION RECEIVER INPUTS VOLTAGE TRANSMITTER INPUTS VOLTAGE TRANSMITTER OUTPUTS VOLTAGE INVALID OUTPUT VCC 0 V+ VCC 0 V* ALL RECEIVER/TRANSMITTER INPUTS INACTIVE ** ANY ONE RECEIVER/TRANSMITTER INPUT BECOMES ACTIVE INVL tAUTOSHDN tAUTOSHDN tWU tWU
*
**
FORCEON = GND, FORCEOFF = VCC
Figure 3a. AutoShutdown Plus and INVALID Timing Diagram
INVALID HIGH 2.7V RECEIVER INPUT LEVELS INDETERMINATE 0.3V 0V -0.3V INDETERMINATE -2.7V INVALID HIGH
INVALID LOW
can drift to undefined voltages. This presents no problem in most applications, since most Ps and other circuitry is inoperative with V CC below 1V. However, in applications where RESET must be valid down to 0V, add a pull-down resistor to ground, holding RESET low (Figure 4). R1's value is not critical; 100k is large enough not to load RESET, and small enough to pull it to ground.
Capacitor Selection
The capacitor type used for C1-C4 is not critical for proper operation; use either polarized or nonpolarized capacitors. The charge pump requires 0.1F capacitors for 3.3V operation. For other supply voltages, refer to Table 3 for required capacitor values. Do not use values smaller than those listed in Table 3. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1's value. However, do not increase C1 without also increasing the values of C2, C3, C4, and CBYPASS, to maintain the proper ratios (C1 to the other capacitors).
Figure 3b. Receiver Positive/Negative Thresholds for INVALID
__________Applications Information
When VCC falls below 1V, RESET no longer sinks current: it becomes an open circuit. Therefore, highimpedance CMOS logic inputs connected to RESET
Ensuring a Valid Reset Output Down to VCC = 0V
8
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
VCC
2V/div FORCEON = FORCEOFF T2OUT
MAX3320
VCC GND RESET
2V/div
100k
T1OUT
Figure 4. Ensuring RESET Valid to VCC = 0V
VCC = 3.3V C1 - C4 = 0.1F
5s/div
When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperatures outside the 0C to +70C range. If in doubt, use capacitors with a larger nominal value. The capacitor's equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-.
Figure 5. Transmitter Outputs when Exiting Shutdown or Powering Up
VCC
C1+ C1 C1C2+ C2 C2-
VCC
V+ C3*
Transmitter Outputs when Exiting Shutdown
Figure 5 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs go to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3k in parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they exit shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.
MAX3320
VC4
T_ IN
T_ OUT
R_ OUT
R_ IN 5k
High Data Rates
The MAX3320 maintains the RS-232 5V minimum transmitter output voltage even at high data rates. Figure 6 shows a transmitter loop-back test circuit. Figure 7 shows a loop-back test result at 120kbps, and Figure 8 shows the same test at 250kbps. For Figure 7, both transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 8, a single transmitter was driven at 250kbps, and both transmitters were loaded with an RS-232 receiver in parallel with 1000pF.
VCC
FORCEON FORCEOFF
1000pF
GND
*C3 CAN BE RETURNED TO VCC OR GND.
Figure 6. Loop-Back Test Circuit
Interconnection with 3V and 5V Logic
The MAX3320 can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 4 for more information on possible combinations of interconnections.
Table 3. Required Minimum Capacitance Values
VCC (V) 3 to 3.6 4.5 to 5.5 3 to 5.5 C1 (F) 0.1 0.047 0.1 C2, C3, C4, CBYPASS
(F)
0.1 0.33 0.47
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9
3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
T1IN 5V 0V T1IN 5V 0V
5V T1OUT R1IN 0V -5V 5V 0V T1OUT R1IN
5V 0V -5V 5V 0V
R1OUT
R1OUT
2s/div VCC = 3.3V C1 - C4 = 0.1F CLOAD = 1000pF VCC = 3.3V C1 - C4 = 0.1F CLOAD = 1000pF
2s/div
Figure 7. Loop-Back Test Result at 120kbps
Figure 8. Loop-Back Test Result at 250kbps
Table 4. Logic-Family Compatibility with Various Supply Voltages
SYSTEM POWER-SUPPLY VOLTAGE (V) 3.3 VCC SUPPLY VOLTAGE (V) 3.3 COMPATIBILITY
___________________Chip Information
TRANSISTOR COUNT: 1577
Compatible with all CMOS families Compatible with all TTL and CMOS families Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS
5
5
5
3.3
10
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset
___________________________________________________Typical Operating Circuit
MAX3320A/B/L/T
+3.3V VCC 0.1F
C1 0.1F
C1+ C1C2+ C2-
VCC
V+ C3* 0.1F
MAX3320
C2 0.1F VCC
VC4 0.1F T1OUT RS-232 OUTPUTS
T1IN
T1
T2IN
T2
T2OUT
FORCEOFF AUTOSHUTDOWN PLUS
P SYSTEM
FORCEON
R1OUT
R1
R1IN
5k R2OUT R2IN
RS-232 INPUTS
R2
RESET INPUT
RESET GND
5k
INVALID
*C3 MAY BE RETURNED TO EITHER VCC OR GND.
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3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4A AutoShutdown Plus and Power-On Reset MAX3320A/B/L/T
________________________________________________________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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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