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19-1298; Rev 7; 2/03
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
General Description
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24 communications interface devices feature low power consumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to 15kV using IEC 1000-4-2 Air-Gap Discharge, 8kV using IEC 1000-4-2 Contact Discharge (9kV for MAX3246E), and 15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmitter output pins are protected to 15kV using the Human Body Model. A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1F capacitors for operation from a +3.3V supply. Each device guarantees operation at data rates of 250kbps while maintaining RS-232 output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaudTM operating mode, while maintaining RS-232compliant output levels. The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1A shutdown mode that reduces power consumption in battery-powered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1A of supply current. The MAX3222E and MAX3232E are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively. The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/ three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shutdown mode in which all receivers remain active, while consuming only 1A (MAX3241E/MAX3246E) or 10nA (MAX3237E). The MAX3222E, MAX3232E, and MAX3241E are available in space-saving SO, SSOP, and TSSOP packages. The MAX3237E is offered in an SSOP package. The MAX3246E is offered in the ultra-small 6 x 6 UCSPTM package.
Features
o ESD Protection for RS-232 I/O Pins (MAX3222E/MAX3232E/MAX3241E/MAX3246E) 15kV--Human Body Model 8kV--IEC 1000-4-2, Contact Discharge 9kV (MAX3246E Only)--IEC 1000-4-2, Contact Discharge 15kV--IEC 1000-4-2, Air-Gap Discharge o ESD Protection for all Logic and Receiver I/O Pins (MAX3237E) 15kV--Human Body Model 8kV--IEC 1000-4-2, Contact Discharge 15kV-IEC 1000-4-2, Air-Gap Discharge o ESD Protection for Transmitter Output Pins (MAX3237E) 15kV--Human Body Model o Guaranteed Data Rate 250kbps (MAX3222E/MAX3232E/MAX3241E/ MAX3246E/MAX3237E, Normal Operation) 1Mbps (MAX3237E, MegaBaud Operation) o Latchup Free o Low-Power Shutdown with Receivers Active 1A (MAX3222E/MAX3241E/MAX3246E) 10nA (MAX3237E) o Flow-Through Pinout (MAX3237E) o Guaranteed Mouse Drivability (MAX3241E) o Meets EIA/TIA-232 Specifications Down to +3.0V
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
_______________Ordering Information
PART MAX3222ECUP MAX3222ECAP TEMP RANGE 0C to +70C 0C to +70C PIN-PACKAGE 20 TSSOP 20 SSOP
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet. Selector Guide appears at end of data sheet. Typical Operating Circuits appear at end of data sheet.
________________________Applications
Battery-Powered Equipment Cell Phones Cell-Phone Data Cables Notebook, Subnotebook, and Palmtop Computers Printers Smart Phones xDSL Modems
MegaBaud is a trademark of Maxim Integrated Products, Inc. UCSP is a trademark of Maxim Integrated Products, Inc.
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V V+ to GND (Note 1) ..................................................-0.3V to +7V V- to GND (Note 1) ...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, EN, SHDN, MBAUD to GND ........................-0.3V to +6V R_IN to GND .....................................................................25V Output Voltages T_OUT to GND...............................................................13.2V R_OUT, R_OUTB (MAX3241E)................-0.3V to (VCC + 0.3V) Short-Circuit Duration, T_OUT to GND.......................Continuous Continuous Power Dissipation (TA = +70C) 16-Pin SSOP (derate 7.14mW/C above +70C) ..........571mW 16-Pin Wide SO (derate 9.52mW/C above +70C) .....762mW 18-Pin Wide SO (derate 9.52mW/C above +70C) .....762mW 18-Pin PDIP (derate 11.11mW/C above +70C)..........889mW 20-Pin TSSOP (derate 10.9mW/C above +70C) ........879mW 20-Pin SSOP (derate 8.00mW/C above +70C) ..........640mW 28-Pin SSOP (derate 9.52mW/C above +70C) ..........762mW 28-Pin Wide SO (derate 12.50mW/C above +70C) .............1W 28-Pin TSSOP (derate 12.8mW/C above +70C) ......1026mW 32-Lead QFN (derate 23.2mW/C above +70C) .........1860mW 6 x 6 UCSP (derate 12.6mW/C above +70C) .............1010mW Operating Temperature Ranges MAX32_ _EC_ _ ...................................................0C to +70C MAX32_ _EE_ _.................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Bump Reflow Temperature (Note 2) Infrared, 15s..................................................................+200C Vapor Phase, 20s..........................................................+215C
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed.
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, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 3, 4)
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS (VCC = +3.3V or +5V, TA = +25C) Supply Current SHDN = VCC, no load SHDN = GND SHDN = R_IN = GND, T_IN = GND or VCC (MAX3237E) T_IN, EN, SHDN, MBAUD T_IN, EN, SHDN, MBAUD VCC = +3.3V VCC = +5.0V Transmitter Input Hysteresis Input Leakage Current RECEIVER OUTPUTS Output Leakage Current Output Voltage Low R_OUT (MAX3222E/MAX3237E/MAX3241E/ MAX3246E), EN = VCC, receivers disabled IOUT = 1.6mA (MAX3222E/MAX3232E/MAX3241E/ MAX3246E), IOUT = 1.0mA (MAX3237E) 0.05 10 0.4 A V T_IN, EN, SHDN T_IN, SHDN, MBAUD MAX3222E, MAX3232E, MAX3241E, MAX3246E MAX3237E (Note 5) 2.0 V 2.4 0.5 0.01 9 1 18 V A MAX3222E, MAX3232E, MAX3241E, MAX3246E MAX3237E Shutdown Supply Current LOGIC INPUTS Input Logic Low Input Logic High 0.8 V 0.3 0.5 1 10 1 2.0 10 300 A nA mA
2
_______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, C1-C4 = 0.1F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 3, 4)
PARAMETER Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current VCC = 0 or +3.0V to +5.5V, VOUT = 12V, transmitters disabled (MAX3222E/MAX3232E/MAX3241E/MAX3246E) All transmitter outputs loaded with 3k to ground VCC = 0, transmitter output = 2V 5 300 5.4 50k 60 25 V mA A TA = +25C 3 TA = +25C TA = +25C VCC = +3.3V VCC = +5.0V VCC = +3.3V VCC = +5.0V -25 0.6 0.8 1.1 1.5 1.5 2.0 0.5 5 7 2.4 2.4 +25 V V V V k IOUT = -1.0mA CONDITIONS MIN VCC 0.6 TYP VCC 0.1 MAX UNITS V
MOUSE DRIVABILITY (MAX3241E) T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with Transmitter Output Voltage 3k to GND, T1OUT and T2OUT loaded with 2.5mA each ESD PROTECTION Human Body Model R_IN, T_OUT IEC 1000-4-2 Air-Gap Discharge (except MAX3237E) IEC 1000-4-2 Contact Discharge (except MAX3237E) IEC 1000-4-2 Contact Discharge (MAX3246E only) T_IN, R_IN, R_OUT, EN, SHDN, MBAUD Human Body Model MAX3237E IEC1000-4-2 Air-Gap Discharge IEC1000-4-2 Contact Discharge
5
V
15 15 8 9 15 15 8 kV kV
_______________________________________________________________________________________
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15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
TIMING CHARACTERISTICS--MAX3222E/MAX3232E/MAX3241E/MAX3246E
(VCC = +3V to +5.5V, C1-C4 = 0.1F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 3, 4)
PARAMETER SYMBOL CONDITIONS RL = 3k, CL = 1000pF, one transmitter switching tPHL tPLH TA = TMIN to TMAX (MAX3222E/MAX3232E/ MAX3241E) TA = +25C (MAX3246E) MIN 250 250 0.15 0.15 200 200 100 50 VCC = +3.3V, TA = +25C, RL = 3k to 7k, measured from +3.0V to -3.0V or -3.0V to +3.0V, one transmitter switching CL = 150pF to 1000pF s ns ns ns ns TYP MAX UNITS
Maximum Data Rate
kbps
Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew
Receiver input to receiver output, CL = 150pF Normal operation (except MAX3232E) Normal operation (except MAX3232E)
|tPHL - tPLH| |tPHL - tPLH|
(Note 6)
Transition-Region Slew Rate
6
30
V/s
TIMING CHARACTERISTICS--MAX3237E
(VCC = +3V to +5.5V, C1-C4 = 0.1F, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3)
PARAMETER CONDITIONS RL = 3k, CL = 1000pF, one transmitter switching, MBAUD = GND Maximum Data Rate VCC = +3.0V to +4.5V, RL = 3k, CL = 250pF, one transmitter switching, MBAUD = VCC VCC = +4.5V to +5.5V, RL = 3k, CL = 1000pF, one transmitter switching, MBAUD = VCC Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew R_IN to R_OUT, CL = 150pF Normal operation Normal operation | tPHL - tPLH |, MBAUD = GND (Note 6) | tPHL - tPLH |, MBAUD = VCC (Note 6) | tPHL - tPLH | VCC = +3.3V, RL = 3k to 7k, +3.0V to -3.0V or -3.0V to +3.0V, TA = +25C CL = 150pF to 1000pF MBAUD = GND MBAUD = VCC 6 24 4 tPHL tPLH MIN 250 1000 1000 0.15 0.15 2.6 2.4 100 50 30 150 30 V/s s s ns ns kbps TYP MAX UNITS
Transition-Region Slew Rate
CL = 150pF to 2500pF, MBAUD = GND
Note 3: MAX3222E/MAX3232E/MAX3241E: C1-C4 = 0.1F tested at +3.3V 10%; C1 = 0.047F, C2, C3, C4 = 0.33F tested at +5.0V 10%. MAX3237E: C1-C4 = 0.1F tested at +3.3V 5%, C1-C4 = 0.22F tested at +3.3V 10%; C1 = 0.047F, C2, C3, C4 = 0.33F tested at +5.0V 10%. MAX3246E; C1-C4 = 0.22F tested at +3.3V 10%; C1 = 0.22F, C2, C3, C4 = 0.54F tested at 5.0V 10%. Note 4: MAX3246E devices are production tested at +25C. All limits are guaranteed by design over the operating temperature range. Note 5: The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are at the supply rails. Note 6: Transmitter skew is measured at the transmitter zero crosspoints. 4 _______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
__________________________________________Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all transmitters loaded with 3k and CL, TA = +25C, unless otherwise noted.)
MAX3222E/MAX3232E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE (V) 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 1000 2000 3000
MAX3237E toc01
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
MAX3222E/MAX3232E SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc02
MAX3222E/MAX3232E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
40 SUPPLY CURRENT (mA) 35 250kbps 30 25 20 15 10 20kbps 120kbps T1 TRANSMITTING AT 250kbps T2 TRANSMITTING AT 15.6kbps
MAX3237E toc03
16 14 12 SLEW RATE (V/s) 10 8 6 4 +SLEW -SLEW
45
VOUT+ T1 TRANSMITTING AT 250kbps T2 TRANSMITTING AT 15.6kbps
VOUT-
2 FOR DATA RATES UP TO 250kbps 0
5 0 4000 5000 0 1000 2000 3000 4000 5000
4000
5000
0
1000
2000
3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3241E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0
MAX3237E to04
MAX3241E SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc05
MAX3241E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 250kbps 40 30 20kbps 20 10 0 120kbps
MAX3237E toc06
14 12 SLEW RATE (V/s) 10 8 6 4
60 50 SUPPLY CURRENT (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
VOUT+ 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
VOUT1000 2000 3000 4000 5000
2 0 0 1000 2000 3000 4000 5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)
TRANSMITTER OUTPUT VOLTAGE (V) TRANSMITTER OUTPUT VOLTAGE (V) 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 500 1000 1500 2000 2500 3000 LOAD CAPACITANCE (pF) VOUT+ FOR DATA RATES UP TO 250kbps 1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3k + CL 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0
MAX3237E toc07
MAX3237E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3246E toc07A
MAX3237E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = VCC)
1Mbps TRANSMITTER OUTPUT VOLTAGE (V) 5.0 2.5 0 -2.5 -5.0 -7.5 2Mbps 1.5Mbps 1Mbps 3000 0 500 1000 1500 2000 1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE 3k + CL LOAD, EACH OUTPUT 2Mbps 1.5Mbps
MAX3237E toc08
7.5
VOUT+
FOR DATA RATES UP TO 250kbps 1 TRANSMITTER 250kbps 4 TRANSMITTERS 15.6kbps ALL TRANSMITTERS LOADED WITH 3k + CL
VOUT-
VOUT500 1000 1500 2000 2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
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15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all transmitters loaded with 3k and CL, TA = +25C, unless otherwise noted.)
MAX3237E SLEW RATE vs. LOAD CAPACITANCE (MBAUD = GND)
MAX3237E toc09
MAX3237E SLEW RATE vs. LOAD CAPACITANCE (MBAUD = VCC)
MAX3237E toc10
MAX3237E SUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA (MBAUD = GND)
250kbps 40 SUPPLY CURRENT (mA) 120kbps 20kbps 30
MAX3237E toc11
12 10 SRSLEW RATE (V/s) 8 SR+ 6 4 2 0 0 500 1000 1500 2000 2500 1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3k + CL
70 60 SLEW RATE (V/s) 50 40 30 20 10 0 0 -SLEW, 1Mbps +SLEW, 1Mbps -SLEW, 2Mbps +SLEW, 2Mbps
50
20 1 TRANSMITTER AT 20kbps, 120kbps, 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3k + CL 0 500 1000 1500 2000 2500 3000
1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE 3k + CL LOAD EACH OUTPUT 500 1000 1500 2000
10
3000
0 LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3237E TRANSMITTER SKEW vs. LOAD CAPACITANCE (MBAUD = VCC)
MAX3237E toc12
MAX3237E TRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (MBAUD = GND)
6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 2.0 TRANSMITTER OUTPUT VOLTAGE (V) VOUT+
MAX3237E toc13
MAX3237E SUPPLY CURRENT vs. SUPPLY VOLTAGE (MBAUD = GND)
MAX3237E toc14
100
50
TRANSMITTER SKEW (ns)
SUPPLY CURRENT (mA)
80
40
60
40 |tPLH - tPHL| 1 TRANSMITTER AT 500kbps 4 TRANSMITTERS AT 1/16 DATA RATE ALL TRANSMITTERS LOADED WITH 3k + CL 0 500 1000 1500 2000 LOAD CAPACITANCE (pF)
1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3k +1000pF
30
20 1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3k AND 1000pF 2.0 2.5 3.0 3.5 4.0 4.5 5.0
20
10 VOUT0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
0
SUPPLY VOLTAGE (V)
MAX3246E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0
MAX3237E toc15
MAX3246E SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc16
MAX3246E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
55 50 45 40 35 30 25 20 15 10 5 0 20kbps 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
MAX3237E toc17
16 14 SLEW RATE (V/s) 12 10 SR+ 8 6 SR-
60
TRANSMITTER OUTPUT VOLTAGE (V)
VOUT+ 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
SUPPLY CURRENT (mA)
250kbps 120kbps
VOUT4 1000 2000 3000 4000 5000 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE (pF) LOAD CAPACITANCE (pF)
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
6
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15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
Pin Description
PIN MAX3222E SO/DIP 1 2 MAX3232E TSSOP -- 2 MAX3237E 13* 28 MAX3241E SSOP/SO 23 28 QFN 22 28 MAX3246E B3 F3 NAME FUNCTION TSSOP/ SO/DIP/ SSOP SSOP 1 2 -- 1
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
EN C1+
Receiver Enable. Active low. Positive Terminal of VoltageDoubler Charge-Pump Capacitor +5.5V Generated by the Charge Pump Negative Terminal of VoltageDoubler Charge-Pump Capacitor Positive Terminal of Inverting Charge-Pump Capacitor Negative Terminal of Inverting Charge-Pump Capacitor -5.5V Generated by the Charge Pump RS-232 Transmitter Outputs RS-232 Receiver Inputs TTL/CMOS Receiver Outputs
3
3
2
3
27
27
27
F1
V+
4
4
3
4
25
24
23
F4
C1-
5 6 7 8, 15 9, 14 10, 13
5 6 7 8, 17 9, 16 10, 15
4 5 6 7, 14 8, 13 9, 12
5 6 7 8, 17 9, 16 12, 15
1 3 4 5, 6, 7, 10, 12 8, 9, 11 18, 20, 21 17*, 19*, 22*, 23*, 24* 2 26 14*
1 2 3 9, 10, 11 4-8 15-19 12, 13, 14 25 26 22
29 30 31 6, 7, 8 1-5 13, 14, 15, 17, 18 10, 11, 12 24 26 21 9, 16, 25, 32
E1 D1 C1 F6, E6, D6 A4, A5, A6, B6, C6 C2, B1, A1, A2, A3
C2+ C2VT_OUT R_IN R_OUT
11, 12 16 17 18
12, 13 18 19 20
10, 11 15 16 --
13, 14 18 19 -- 1, 10, 11, 20
E3, E2, D2 F5 F2 B2 C3, D3, B4, C4, D4, E4, B5, C5, D5, E5
T_IN GND VCC SHDN N.C.
TTL/CMOS Transmitter Inputs Ground +3.0V to +5.5V Supply Voltage Shutdown Control. Active low. No Connection. For MAX3246E, these locations are not populated with solder bumps. MegaBaud Control Input. Connect to GND for normal operation; connect to VCC for 1Mbps transmission rates. Noninverting Complementary Receiver Outputs. Always active.
--
11, 14
--
--
--
--
--
--
--
15*
--
--
--
MBAUD
--
--
--
--
16
20, 21
19, 20
--
R_OUTB
*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
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7
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
VCC 0.1F VCC
VCC 0.1F VCC
C1+ C1 C1C2+ C2 C2T_ IN
V+ C3 C1
C1+ C1-
V+ C3
MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E
VC4 T_ OUT C2
C2+ C2T_ IN
MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E
VC4 T_ OUT
R_ OUT
R_ IN
R_ OUT
R_ IN
5k GND 3k 1000pF (2500pF, MAX3237E only) GND
5k 7k 150pF
MINIMUM SLEW-RATE TEST CIRCUIT
MAXIMUM SLEW-RATE TEST CIRCUIT
Figure 1. Slew-Rate Test Circuits
Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246Es' 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) over the +3.0V to +5.5V VCC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).
into a high-impedance state when the device is in shutdown mode (SHDN = GND). The MAX3222E/ MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to 12V in shutdown. The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or VCC. The MAX3237E's transmitter inputs have a 400k active positive-feedback resistor, allowing unused inputs to be left unconnected.
MAX3237E MegaBaud Operation
For higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k in parallel with 250pF for +3.0V < VCC < +4.5V. For +5V 10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k in parallel with 1000pF.
RS-232 Transmitters
The transmitters are inverting level translators that convert TTL/CMOS-logic levels to 5V EIA/TIA-232-compliant levels. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E 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 or mice. The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forced
LapLink is a trademark of Traveling Software. 8
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/ MAX3246E receivers have inverting three-state outputs. Drive EN high to place the receiver(s) into a highimpedance state. Receivers can be either active or inactive in shutdown (Table 1).
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
VCC
5V/div 0 SHDN T2OUT
VCC
PROTECTION DIODE Rx
PREVIOUS RS-232
2V/div 0
5k UART Tx GND SHDN = GND
VCC = 3.3V C1-C4 = 0.1F 40s/div T1OUT
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM A ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC TO P LOGIC TRANSITION DETECTOR
Figure 3. Transmitter Outputs Recovering from Shutdown or Powering Up
MAX3222E/MAX3237E/MAX3241E/ MAX3246E Shutdown Mode
MAX3237E/MAX3241E
R1OUTB
VCC
PROTECTION DIODE Rx
R1OUT THREE-STATED EN = VCC 5k
R1IN
UART Tx GND T1IN SHDN = GND
T1OUT
Supply current falls to less than 1A in shutdown mode (SHDN = low). The MAX3237E's supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device's charge pumps are shut off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter outputs are disabled (high impedance). The time required to recover from shutdown is typically 100s, as shown in Figure 3. Connect SHDN to VCC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).
15kV ESD Protection
As with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. 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 RS-232 products can latch and must be powered down to remove latchup. Furthermore, the MAX3237E logic I/O pins also have 15kV ESD protection. Protecting the logic I/O pins to 15kV makes the MAX3237E ideal for data cable applications.
9
b) NEW MAX3237E/MAX3241E: EN SHUTS DOWN RECEIVER OUTPUTS B (EXCEPT FOR B OUTPUTS), SO NO CURRENT FLOWS TO UART IN SHUTDOWN. B B OUTPUTS INDICATE RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH.
Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237E/MAX3241E (b) with Previous Transceivers (a)
The complementary outputs on the MAX3237E/ MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN. This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where VCC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).
_______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Table 1. MAX3222E/MAX3237E/MAX3241E/ MAX3246E Shutdown and Enable Control Truth Table
SHDN 0 0 1 1 EN 0 1 0 1 T_OUT High-Z High-Z Active Active R_OUT Active High-Z Active High-Z R_OUTB (MAX3237E/ MAX3241E) Active Active Active Active
ESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E 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 * 9kV (MAX3246E only) using the Contact Discharge method specified in IEC 1000-4-2 * 15kV using the Air-Gap Discharge method specified in IEC 1000-4-2
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Cs 100pF
STORAGE CAPACITOR
Figure 4a. Human Body ESD Test Model
Figure 4b. Human Body Model Current Waveform
I 100% RC 50M to 100M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST 90%
Cs 150pF
STORAGE CAPACITOR
I PEAK
10% t r = 0.7ns to 1ns t 30ns 60ns
Figure 5a. IEC 1000-4-2 ESD Test Model 10
Figure 5b. IEC 1000-4-2 ESD Generator Current Waveform
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
VCC (V) 3.0 to 3.6 4.5 to 5.5 3.0 to 5.5 MAX3237E/MAX3246E 3.0 to 3.6 3.15 to 3.6 4.5 to 5.5 3.0 to 5.5
C1 (F) 0.1 0.047 0.1 0.22 0.1 0.047 0.22
C2, C3, C4 (F) 0.1 0.33 0.47 0.22 0.1 0.33 1.0
TRANSMITTER OUTPUT VOLTAGE (V)
5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 1 2 3 4 5 6 7 8 9 VCC VOUTVOUTVCC = 3.0V VOUT+ VOUT+
MAX3222E/MAX3232E/MAX3241E
10
LOAD CURRENT PER TRANSMITTER (mA)
Table 3. Logic-Family Compatibility with Various Supply Voltages
SYSTEM POWER-SUPPLY VOLTAGE (V) 3.3 VCC SUPPLY VOLTAGE (V) COMPATIBILITY
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per Transmitter
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3222E/ MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESDprotection 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 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the 8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The AirGap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.
3.3
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
For the MAX3237E, all logic and RS-232 I/O pins are characterized for protection to 15kV per the Human Body Model.
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.
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. 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.
Human Body Model
Figure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when discharged into a 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.
______________________________________________________________________________________
MAX3222E-fig06a
Table 2. Required Minimum Capacitor Values
6
11
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
VCC = +3.0V TO +5.5V
CBYPASS 26 VCC 27 C3 COMPUTER SERIAL PORT 3 C4
28 C1 24 1 C2 2 14 13 VCC 12 21 20 19 18 17 16 15 23
C1+ C1C2+ C2T1IN T2IN T3IN R1OUTB R2OUTB R1OUT R2OUT R3OUT R4OUT R5OUT EN
V+
MAX3241E
V-
T1OUT 9 +V T2OUT 10 +V T3OUT 11 -V GND R1IN 4 5k 5k 5k 5k 5k SHDN GND 25 R2IN 5 R3IN R4IN 6 7 MOUSE R5IN 8 22 Tx
VCC
Figure 6b. Mouse Driver Test Circuit
Applications Information
Capacitor Selection
The capacitor type used for C1-C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1F capacitors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use values smaller than those listed in Table 2. 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). When using the minimum required capacitor values, make sure the capacitor value does not degrade
12
excessively with temperature. 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-.
Power-Supply Decoupling
In most circumstances, a 0.1F VCC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as chargepump capacitor C1. Connect bypass capacitors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs meet EIA/TIA-562 levels of 3.7V with supply voltages as low as 2.7V.
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
Transmitter Outputs Recovering from Shutdown
Figure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two transmitter outputs are shown going 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 come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Mouse Drivability
The MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.
VCC 0.1F
T1IN
VCC C1+ C1 C1C2+ C2 C2V+ C3
5V/div
MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E
T1OUT
VC4
5V/div
R1OUT
T_ OUT
5V/div VCC = 3.3V, C1-C4 = 0.1F 2s/div
T_ IN
R_ OUT
R_ IN 5k
Figure 9. MAX3241E Loopback Test Result at 250kbps
1000pF
GND
+5V 0 T_IN
Figure 7. Loopback Test Circuit
+5V 0 -5V +5V VCC = 3.3V C1-C4 = 0.1F T_OUT 5k + 250pF
T1IN
5V/div
R_OUT
0
400ns/div 5V/div T1OUT
Figure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = VCC)
VCC = 3.3V C1-C4 = 0.1F 2s/div 5V/div
R1OUT
Figure 8. MAX3241E Loopback Test Result at 120kbps ______________________________________________________________________________________ 13
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Figure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.
UCSP Reliability
The UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user's assembly methods, circuit board material, and usage environment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it. Mechanical stress performance is a greater consideration for a UCSP package. UCSPs are attached through direct solder contact to the user's PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be considered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through environmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim's website at www.maxim-ic.com.
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E maintain the RS-232 5V minimum transmitter output voltage even at high data rates. Figure 7 shows a transmitter loopback test circuit. Figure 8 shows a loopback test result at 120kbps, and Figure 9 shows the same test at 250kbps. For Figure 8, all transmitters were driven simultaneously at 120kbps into RS232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF. The MAX3237E maintains the RS-232 5.0V minimum transmitter output voltage at data rates up to 1Mbps. Figure 10 shows a loopback test result at 1Mbps with MBAUD = VCC. For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.
Interconnection with 3V and 5V Logic
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3 for more information on possible combinations of interconnections.
Table 4. Reliability Test Data
TEST Temperature Cycle Operating Life Moisture Resistance Low-Temperature Storage Low-Temperature Operational Solderability ESD High-Temperature Operating Life CONDITIONS TA = -35C to +85C, TA = -40C to +100C TA = +70C TA = +20C to +60C, 90% RH TA = -20C TA = -10C 8-hour steam age 15kV, Human Body Model TJ = +150C DURATION 150 cycles, 900 cycles 240 hours 240 hours 240 hours 24 hours -- -- 168 hours FAILURES PER SAMPLE SIZE 0/10, 0/200 0/10 0/10 0/10 0/10 0/15 0/5 0/45
14
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
__________________________________________________________Pin Configurations
TOP VIEW
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
EN 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2VT2OUT R2IN 6 7 8 9
18 SHDN 17 VCC 16 GND 15 T1OUT
EN 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2- 6 V- 7 T2OUT 8 R2IN 9 R2OUT 10
20 SHDN 19 VCC 18 GND 17 T1OUT
N.C. 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2- 6 V- 7 T2OUT 8 R2IN 9 N.C. 10
20 N.C. 19 VCC 18 GND 17 T1OUT
C1+ 1 V+ 2 C1- 3 C2+ 4 C2- 5 V- 6 T2OUT 7 R2IN 8
16 VCC 15 GND 14 T1OUT
MAX3232E
13 R1IN 12 R1OUT 11 T1IN 10 T2IN 9 R2OUT
MAX3222E
14 R1IN 13 R1OUT 12 T1IN 11 T2IN 10 R2OUT
MAX3222E
16 R1IN 15 R1OUT 14 N.C. 13 T1IN 12 T2IN 11 N.C.
MAX3232E
16 R1IN 15 R1OUT 14 T1IN 13 T2IN 12 R2OUT 11 N.C.
SSOP/SO/DIP
SO/DIP TSSOP/SSOP TSSOP TOP VIEW
C2+ GND C2VT1OUT T2OUT T3OUT R1IN R2IN 1 2 3 4 5 6 7 8 9 28 C1+ 27 V+ 26 VCC 25 C124 T1IN C2+ C2VR1IN R2IN R3IN R4IN R5IN T1OUT 1 2 3 4 5 6 7 8 9 28 C1+ 27 V+ 26 VCC 25 GND 24 C1-
N.C.
C2+
C1+
V-
VCC
C2-
V+
32
31
30
29
28
27
26
25 24 23 22 21
N.C.
R1IN R2IN R3IN R4IN R5IN T1OUT T2OUT T3OUT
1 2 3 4 5 6 7 8 10 11 12 13 14 15 16
GND C1EN SHDN R1OUTB R2OUTB R1OUT R2OUT
MAX3237E
23 T2IN 22 T3IN 21 R1OUT 20 R2OUT 19 T4IN 18 R3OUT 17 T5IN 16 R1OUTB 15 MBAUD
MAX3241E
23 EN 22 SHDN 21 R1OUTB 20 R2OUTB 19 R1OUT 18 R2OUT 17 R3OUT 16 R4OUT 15 R5OUT
MAX3241E
20 19 18 17
T4OUT 10 R3IN 11 T5OUT 12 EN 13 SHDN 14
T2OUT 10 T3OUT 11 T3IN 12 T2IN 13 T1IN 14
9
T3IN
T2IN
T1IN
R5OUT
R4OUT
SSOP
SSOP/SO/TSSOP
QFN
______________________________________________________________________________________
R3OUT
N.C.
N.C.
15
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Pin Configurations (continued)
TOP VIEW (BUMPS ON BOTTOM) B2: SHDN C2: R1OUT D2: T3IN E2: T2IN B3: EN E3: T1IN BUMPS B4, B5, C3, C4, C5, D3, D4, D5, E4, AND E5 NOT POPULATED
R4OUT R3OUT A1 A2
R5OUT A3
R1IN A4
R2IN A5 A6 R3IN
R2OUT B1
B2
B3
B6 R4IN
V- C1
C2
C6 R5IN
MAX3246E
C2- D1 D2 D6 T3OUT
C2+ E1
E2
E3
E6 T2OUT
V+ F1
F2 VCC
F3 C1+
F4 C1-
F5 GND
F6 T1OUT
UCSP
16
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
__________________________________________________Typical Operating Circuits
+3.3V CBYPASS C1 0.1F 2 C1+ 4 5 C2 0.1F 6 C1C2+ C2T1OUT 15 RS-232 OUTPUTS 11 T2IN T2OUT 8 TTL/CMOS INPUTS 10 T2IN T2OUT 7 17 VCC V+ 3 C3* 0.1F V7 C4 0.1F C2 0.1F C1 0.1F +3.3V CBYPASS 1 C1+ 3 4 5 C1C2+ C2T1OUT 14 RS-232 OUTPUTS 16 VCC V+ 2 C3* 0.1F 6 C4 0.1F
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
MAX3222E
MAX3232E
V-
12 T1IN TTL/CMOS INPUTS
11 T1IN
13 R1OUT TTL/CMOS OUTPUTS 10 R2OUT 1 EN GND 16
R1IN 14 5k R2IN 9 5k SHDN 18 RS-232 INPUTS TTL/CMOS OUTPUTS
12 R1OUT
R1IN 13 5k RS-232 INPUTS
9 R2OUT
R2IN 8 5k
GND 15
*C3 CAN BE RETURNED TO EITHER VCC OR GROUND.
NOTE: PIN NUMBERS REFER TO SO/DIP PACKAGES.
SEE TABLE 2 FOR CAPACITOR SELECTION.
______________________________________________________________________________________
17
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
_____________________________________Typical Operating Circuits (continued)
+3.3V CBYPASS 28 C1+ 0.1F 25 1 0.1F 3 C1C2+ C2T1 T2 T1OUT 5 T2OUT 6 T3OUT 7 RS-232 OUTPUTS 26 VCC V+ 27 C3* 0.1F 4 0.1F
+3.3V CBYPASS 28 C1+ 24 1 C2 0.1F 2 C1C2+ C2T1OUT 9 T2OUT 10 T3OUT 11 26 VCC V+ 27 C3* 0.1F V3 C4 0.1F
C1 0.1F
MAX3237E
V-
MAX3241E
24 T1IN 23 T2IN LOGIC INPUTS 22 T3IN 19 T4IN 17 T5IN 16 R1OUTB
14 T1IN 13 T2IN 12 T3IN 21 R1OUTB 20 R2OUTB
TTL/CMOS INPUTS
RS-232 OUTPUTS
T3 T4 T5
T4OUT 10 T5OUT 12 19 R1OUT R1IN 4 5k 18 R2OUT R2IN 5k 17 R3OUT R3IN 6 5k 16 R4OUT R4IN 7 5k 15 R5OUT MBAUD 15 14 23 EN GND 25 SHDN R5IN 8 5k 22 RS-232 INPUTS 5 R1IN 8 5k TTL/CMOS OUTPUTS 9 RS-232 INPUTS
21 R1OUT
R1
LOGIC OUTPUTS
20 R2OUT
R2
R2IN 5k
18 R3OUT
R3
R3IN 11 5k
13 EN GND 2
SHDN
*C3 CAN BE RETURNED TO EITHER VCC OR GROUND.
18
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
_____________________________________Typical Operating Circuits (continued)
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
+3.3V CBYPASS F3 C1+ F4 E1 C2 0.1F D1 C1C2+ C2T1OUT F6 T2OUT E6 T3OUT D6 RS-232 OUTPUTS F2 VCC V+ F1 C3* 0.1F VC1 C4 0.1F
C1 0.1F
MAX3246E
E3 T1IN TTL/CMOS INPUTS E2 T2IN D2 T3IN
C2 R1OUT
R1IN A4 5k
B1 R2OUT
R2IN 5k
A5
TTL/CMOS OUTPUTS
A1 R3OUT
R3IN A6 5k
RS-232 INPUTS
A2 R4OUT
R4IN B6 5k
A3 R5OUT
R5IN C6 5k
B3 EN GND F5 SHDN
B2
*C3 CAN BE RETURNED TO EITHER VCC OR GROUND.
______________________________________________________________________________________
19
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Selector Guide
PART MAX3222E MAX3232E MAX3237E (Normal) MAX3237E (MegaBaud) MAX3241E MAX3246E NO. OF GUARANTEED LOW-POWER DRIVERS/ DATA RATE SHUTDOWN RECEIVERS (bps) 2/2 2/2 5/3 5/3 3/5 3/5 -- 250k 250k 250k 1M 250k 250k
Ordering Information (continued)
PART MAX3222ECWN MAX3222ECPN MAX3222EC/D MAX3222EEUP MAX3222EEAP MAX3222EEWN MAX3222EEPN MAX3232ECAE MAX3232ECWE MAX3232ECPE MAX3232ECUP MAX3232EEAE MAX3232EEWE MAX3232EEPE MAX3232EEUP MAX3237ECAI MAX3237EEAI MAX3241ECAI MAX3241ECWI MAX3241ECUI MAX3241ECGJ MAX3241EEAI MAX3241EEWI MAX3241EEUI MAX3246ECBX-T MAX3246EEBX-T TEMP RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C 0C to +70C -40C to +85C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C -40C to +85C PIN-PACKAGE 18 Wide SO 18 Plastic DIP Dice* 20 TSSOP 20 SSOP 18 Wide SO 18 Plastic DIP 16 SSOP 16 Wide SO 16 Plastic DIP 20 TSSOP 16 SSOP 16 Wide SO 16 Plastic DIP 20 TSSOP 28 SSOP 28 SSOP 28 SSOP 28 Wide SO 28 TSSOP 32 QFN 28 SSOP 28 Wide SO 28 TSSOP 6 x 6 UCSP* 6 x 6 UCSP*
___________________ Chip Information
TRANSISTOR COUNT: MAX3222E/MAX3232E: 1129 MAX3237E: 2110 MAX3241E: 1335 MAX3246E: 842
*Requires solder temperature profile described in the Absolute Maximum Ratings section. UCSP Reliability is integrally linked to the user's assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this datasheet for more information.
20
______________________________________________________________________________________
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
TSSOP4.40mm.EPS
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
______________________________________________________________________________________
21
15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
36L,UCSP.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.
22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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