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19-1339; Rev 0; 1/98
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
________________General Description
The MAX3224E/MAX3225E/MAX3226E/MAX3227E/ MAX3244E/MAX3245E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs 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. All devices achieve a 1A supply current using Maxim's revolutionary AutoShutdown PlusTM feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. The MAX3225E/MAX3227E/MAX3245E also feature MegaBaudTM operation, guaranteeing 1Mbps for highspeed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1F capacitors for operation from a 3.3V supply. The MAX3224E-MAX3227E feature a logiclevel output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting. All devices are available in a space-saving SSOP package.
____________________________Features
o ESD Protection for RS-232 I/O Pins: 15kV--Human Body Model 8kV--IEC1000-4-2, Contact Discharge 15kV--IEC1000-4-2, Air-Gap Discharge o Latchup Free o 1A Supply Current o AutoShutdown Plus--EDN Innovation of the Year o Guaranteed Data Rate: 250kbps (MAX3224E/3226E/3244E) 1Mbps (MAX3225E/3227E/3245E) o Guaranteed Slew Rate: 6V/s (MAX3224E/3226E/3244E) 24V/s (MAX3225E/3227E/3245E) o Meets EIA/TIA-232 Specifications Down to 3.0V o Guaranteed Mouse Driveability (MAX3244E/3245E) o Ready-to-Transmit Logic-Level Output
MAX3224E-MAX3227E/MAX3244E/MAX3245E
_______________Ordering Information
PART MAX3224ECPP MAX3224ECAP MAX3224EEPP MAX3224EEAP MAX3225ECPP MAX3225ECAP MAX3225EEPP MAX3225EEAP TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP
________________________Applications
Notebook, Subnotebook, and Palmtop Computers Cellular Phones Battery-Powered Equipment Hand-Held Equipment Peripherals Printers
Ordering Information continued at end of data sheet.
_____________________ Selector Guide
PART NO. OF GUARANTEED AUTOREADY DRIVERS/ DATA RATE SHUTDOWN OUTPUT RECEIVERS (bps) PLUS 2/2 2/2 1/1 1/1 3/5 3/5 250k 1M 250k 1M 250k 1M -- -- 1
MAX3224E
AutoShutdown Plus and MegaBaud are trademarks of Maxim Integrated Products.
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; 5,649,210; and other patents pending.
MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E
________________________________________________________________ Maxim Integrated Products
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.
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
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, FORCEON, FORCEOFF to GND ................ -0.3V to +6V R_IN to GND ....................................................................25V Output Voltages T_OUT to GND.............................................................13.2V R_OUT, INVALID, READY to GND .........-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 20-Pin Plastic DIP (derate 11.11mW/C above +70C) ...889mW 20-Pin SSOP (derate 8.00mW/C above +70C) .........640mW 28-Pin Wide SO (derate 12.5mW/C above +70C)........... 1W 28-Pin SSOP (derate 9.52mW/C above +70C) .........762mW Operating Temperature Ranges MAX32_ _EC_ _ .................................................0C to +70C MAX32_ _EE_ _................................................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: V+ and V- can have maximum magnitudes of 7V, 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%; CL = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Supply Current, AutoShutDown Plus Supply Current, Shutdown Supply Current, AutoShutDown Plus Disabled LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low Input Logic Threshold High Transmitter Input Hysteresis Input Leakage Current Output Leakage Current Output Voltage Low Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Input Resistance 2 TA = +25C 3 TA = +25C TA = +25C VCC = 3.3V VCC = 5.0V VCC = 3.3V VCC = 5.0V -25 0.6 0.8 1.2 1.5 1.5 1.8 0.5 5 7 2.4 2.4 +25 V V V V k T_IN, FORCEON, FORCEOFF R_OUT (MAX3244E/MAX3245E), receivers disabled IOUT = 1.6mA IOUT = -1.0mA VCC - 0.6 VCC - 0.1 T_IN, FORCEON, FORCEOFF T_IN, FORCEON, FORCEOFF VCC = 3.3V VCC = 5.0V 2 2.4 0.5 0.01 0.05 1 10 0.4 0.8 V V V A A V V SYMBOL CONDITIONS FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle FORCEOFF = GND FORCEON = FORCEOFF = VCC, no load MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = 3.3V or 5.0V, TA = +25C) 1 1 0.3 10 10 1 A A mA
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; CL = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER TRANSMITTER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current VCC = 0 or 3V to 5.5V, VOUT = 12V, Transmitters disabled All transmitter outputs loaded with 3k to ground VCC = V+ = V- = 0, transmitter outputs = 2V 5 300 5.4 10M 60 25 V mA A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3224E-MAX3227E/MAX3244E/MAX3245E
MOUSE DRIVEABILITY (MAX3244E/MAX3245E) T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3k to GND, T1OUT and T2OUT loaded with 2.5mA each IEC1000-4-2 Air Discharge R_IN, T_OUT IEC1000-4-2 Contact Discharge Human Body Model AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF = VCC) Receiver Input Threshold to INVALID Output High Receiver Input Threshold to INVALID Output Low INVALID, READY Output Voltage Low (MAX3224E-MAX3227E) INVALID, READY Output Voltage High (MAX3224E-MAX3227E) Receiver Positive or Negative Threshold to INVALID High Receiver Positive or Negative Threshold to INVALID Low Receiver or Transmitter Edge to Transmitters Enabled tINVH tINVL tWU Figure 4a Figure 4a Positive threshold Negative threshold -2.7 -0.3 0.3 2.7 V V
Transmitter Output Voltage ESD PROTECTION
5
V
15 8 15 kV
IOUT = -1.6mA
0.4
V
IOUT = -1.0mA
VCC - 0.6
V
VCC = 5V, Figure 4b VCC = 5V, Figure 4b VCC = 5V, Figure 5b (Note 2) 15
1 30 100 30 60
s s s sec
Receiver or Transmitter Edge to tAUTOSHDN VCC = 5V, Figure 5b (Note 2) Transmitters Shutdown
_______________________________________________________________________________________
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
TIMING CHARACTERISTICS--MAX3224E/MAX3226E/MAX3244E
(VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; CL = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Maximum Data Rate Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew tPHL - tPLH tPHL - tPLH VCC = 3.3V, TA = +25C, RL = 3k to 7k, measured from +3V to -3V or -3V to +3V CL = 150pF to 1000pF CL = 150pF to 2500pF 6 4 tPHL tPLH SYMBOL CONDITIONS RL = 3k, CL = 1000pF, one transmitter switching R_IN to R_OUT, CL = 150pF Normal operation (MAX3244E only) Normal operation (MAX3244E only) (Note 3) MIN 250 0.15 0.15 200 200 100 50 30 V/s 30 TYP MAX UNITS kbps s ns ns ns ns
Transition-Region Slew Rate
TIMING CHARACTERISTICS--MAX3225E/MAX3227E/MAX3245E
(VCC = +3V to +5.5V, C1-C4 = 0.1F, tested at 3.3V 10%; CL = 0.047F, C2-C4 = 0.33F, tested at 5.0V 10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS RL = 3k, CL = 1000pF, one transmitter switching Maximum Data Rate VCC = 3.0V to 4.5V, RL = 3k, CL = 250pF, one transmitter switching VCC = 4.5V to 5.5V, RL = 3k, CL = 1000pF, one transmitter switching Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew Transition-Region Slew Rate tPHL - tPLH tPHL - tPLH VCC = 3.3V, TA = +25C, RL = 3k to 7k, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V 24 tPHL tPLH R_IN to R_OUT, CL = 150pF Normal operation (MAX3245E only) Normal operation (MAX3245E only) (Note 3) MIN 250 1000 1000 0.15 0.15 200 200 25 50 150 s ns ns ns ns V/s kbps TYP MAX UNITS
Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds. Note 3: Transmitter skew is measured at the transmitter zero cross points.
4
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
__________________________________________Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, 0.1F capacitors, all transmitters loaded with 3k and CL, TA = +25C, unless otherwise noted.)
MAX3224E/MAX3226E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-01
MAX3224E-MAX3227E/MAX3244E/MAX3245E
MAX3224E/MAX3226E SLEW RATE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-02
MAX3224E/MAX3226E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
40 SUPPLY CURRENT (mA) 35 30 25 20 15 10 20kbps 250kbps 120kbps
MAX3224-7/44/45E-03
TRANSMITTER OUTPUT VOLTAGE (V)
6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0
16 14 12 SLEW RATE (V/s) 10 8 6 4 +SLEW -SLEW
45
VOUT+ T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps
VOUT1000 2000 3000 4000 5000
2 FOR DATA RATES UP TO 250kbps 0 0 1000 2000 3000 4000 5000
5 0 0
T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps 1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225E/MAX3227E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-04
MAX3225E/MAX3227E SLEW RATE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-05
MAX3225E/MAX3227E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 1Mbps 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3k + CL 2Mbps 1.5Mbps
MAX3224-7/44/45E-06
7.5 TRANSMITTER OUTPUT VOLTAGE (V) 5.0 2Mbps 2.5 0 -2.5 -5.0 -7.5 0 500 1000 1500 2000 1.5Mbps 1Mbps 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3k + CL 1.5Mbps 1Mbps 2Mbps
80 70 60 SLEW RATE (V/s) -SLEW 50 +SLEW 40 30 20 10 0 0 1 TRANSMITTER AT 1Mbps 1 TRANSMITTER AT 62.5kbps (MAX3225E) 500 1000 1500 2000
100
10 0 2500 0 500 1000 1500 2000 2500
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225E/MAX3227E TRANSMITTER SKEW vs. LOAD CAPACITANCE
45 40 TRANSMITTER SKEW (ns) 35 30 25 20 15 10 5 0 0 500 1000 1500 2000 2500 3000 LOAD CAPACITANCE (pF) AVERAGE; 10 PARTS 1 TRANSMITTER AT 512kbps 1 TRANSMITTER AT 30kbps (MAX3225E) LOAD = 3k + CL
MAX3224-7/44/45E-07
MAX3224E-MAX3227E READY TURN-ON TIME vs. TEMPERATURE
MAX3224-7/44/45E-08
MAX3224E-MAX3227E READY TURN-OFF TIME vs. TEMPERATURE
180 READY TURN-OFF TIME (ns) 160 140 120 100 80 60 40 20 0
MAX3224-7/44/45E-09
50
38 36 READY TURN-ON TIME (s) 34 32 30 28 26 24 22 20 -40 -20 0 20 40 60 80
200
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
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5
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
_____________________________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.)
MAX3244E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-10
MAX3244E SLEW RATE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-11
MAX3244E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 250kbps 120kbps
MAX3224-7/44/45E-12
6 TRANSMITTER OUTPUT VOLTAGE (V) 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 0 1000 2000 3000 VOUT+ 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
14 12 SLEW RATE (V/s) 10 8 6 4
60 50 SUPPLY CURRENT (mA) 40 30 20kbps 20 10 0
VOUT4000 5000
2 0 0 1000 2000 3000 4000 5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3245E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-13
MAX3245E SLEW RATE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-14
7.5 TRANSMITTER OUTPUT VOLTAGE (V) 5.0 2Mbps 2.5 0 -2.5 -5.0 -7.5 0 400 800 1200 1600 1.5Mbps 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 2Mbps 1.5Mbps 1Mbps 1Mbps
70 60 SLEW RATE (V/s) 50 40 30 20 10 0 1 TRANSMITTER AT 1Mbps 2 TRANSMITTERS AT 62.5kbps 0 400 800 1200 1600
2000
2000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3245E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE
MAX3224-7/44/45E-15
MAX3245E TRANSMITTER SKEW vs. LOAD CAPACITANCE
45 40 TRANSMITTER SKEW (ns) 35 30 25 20 15 10
MAX3224-7/44/45E-16
100 90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 10 0 0 400 800 1200 1600 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 1Mbps 2Mbps 1.5Mbps
50
5 0 2000 0 1000 2000 3000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
6
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
______________________________________________________________Pin Description
PIN MAX3224E MAX3225E 1 2 3 4 5 6 7 8, 17 9, 16 10, 15 11 12, 13 14 18 19 20 -- MAX3226E MAX3227E 1 2 3 4 5 6 7 13 8 9 10 11 12 14 15 16 -- MAX3244E MAX3245E -- 28 27 24 1 2 3 9-11 4-8 15-19 21 12-14 23 25 26 22 20 NAME FUNCTION
MAX3224E-MAX3227E/MAX3244E/MAX3245E
READY C1+ V+ C1C2+ C2VT_OUT R_IN R_OUT INVALID T_IN FORCEON GND VCC FORCEOFF R2OUTB
Ready to Transmit Output, active-high. READY is enabled high when V- goes below -4V and the device is ready to transmit. Positive Terminal of Voltage-Doubler Charge-Pump Capacitor +5.5V generated by the charge pump Negative Terminal of Voltage-Doubler 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 Valid Signal Detector Output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input. TTL/CMOS Transmitter Inputs Force-On Input, active high. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). Ground +3.0V to +5.5V Single Supply Voltage Force-Off Input, active low. Drive low to shut down transmitters, receivers (except R2OUTB), and charge pump. This overrides AutoShutdown Plus and FORCEON (Table 1). TTL/CMOS Noninverting Complementary Receiver Outputs. Always active.
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3224E-MAX3227E/MAX3244E/MAX3245E'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), over the +3.0V to +5.5V range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5V, the charge pump is enabled; 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.
The READY output (MAX3224E-MAX3227E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V.
RS-232 Transmitters
The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3224E/MAX3226E/MAX3244E guarantee a 250kbps data rate (1Mbps, for the MAX3225E/MAX3227E/ MAX3245E) with worst-case loads of 3k in parallel with 1000pF, providing compatibility with PC-to-PC comLapLink is a trademark of Traveling Software.
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
POWERMANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID PROTECTION DIODE VCC
MAX3244E MAX3245E
VCC Rx UART Tx GND SHDN = GND I
PREVIOUS RS-232
5k
CPU
I/O CHIP WITH UART
RS-232
a)
OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN.
VCC TO P LOGIC TRANSITION DETECTOR
Figure 1. Interface Under Control of PMU
PROTECTION DIODE
I
MAX3244E MAX3245E
R2OUTB
munication 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 or when the AutoShutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30sec, the transmitters are disabled and the outputs go into a highimpedance state. When powered off or shut down, the outputs can be driven to 12V. The transmitter inputs do not have pull-up resistors. Connect unused inputs to GND or VCC.
VCC Rx UART R2OUT THREE-STATED 5k Tx GND T1IN FORCEOFF = GND T1OUT R2IN
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3224E-MAX3227E feature inverting outputs that always remain active (Table 1). The MAX3244E/MAX3245E have inverting three-state
b)
NEW MAX3244E/MAX3245E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE.
Figure 2. The MAX3244E/MAX3245E detect RS-232 activity when the UART and interface are shut down.
8
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
Table 1. Output Control Truth Table
OPERATION STATUS FORCEOFF VALID RECEIVER LEVEL RECEIVER OR TRANSMITTER EDGE WITHIN 30sec X R_OUT (MAX3224E/ MAX3225E/ MAX3226E/ MAX3227E) Active R_OUT (MAX3244E/ MAX3245E) R2OUTB (MAX3244E/ MAX3245E)
FORCEON
T_OUT
Shutdown (Forced Off) Normal Operation (Forced On) Normal Operation (AutoShutdown Plus) Shutdown (AutoShutdown Plus) Normal Operation Normal Operation Shutdown Normal Operation (AutoShutdown) Shutdown (AutoShutdown)
X
0
X
High-Z
High-Z
Active
1
1
X
X
Active
Active
Active
Active
0
1
X
Yes
Active
Active
Active
Active
0 INVALID* INVALID* INVALID* INVALID*
1 1 1 1 INVALID**
X Yes X No Yes
No X Yes No X
High-Z Active Active High-Z Active
Active Active Active Active Active
Active Active Active Active Active
Active Active Active Active Active
INVALID*
INVALID**
No
X
High-Z
Active
High-Z
Active
X = Don't care
* INVALID connected to FORCEON ** INVALID connected to FORCEON and FORCEOFF
outputs that are high impedance when shut down (FORCEOFF = GND) (Table 1). The MAX3244E/MAX3245E feature an extra, always active, noninverting output, R2OUTB. R2OUTB output monitors receiver activity while the other receivers are high impedance, allowing Ring Indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to ground in shutdown to accommodate peripherals such as UARTs (Figure 2). The MAX3224E-MAX3227E/MAX3244E/MAX3245E feature an INVALID output that is enabled low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiv-
er input's condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4).
AutoShutdown Plus Mode
The MAX3224E-MAX3227E/MAX3244E/MAX3245E achieve a1Asupply current with Maxim's AutoShutdown Plus feature, which operates when FORCEOFF is high and a FORCEON is low. When these devices do not sense a valid signal transition on any receiver and transmitter input for 30sec, the on-board charge pumps are shut down, reducing supply current to 1A. This occurs if the RS-232 cable is disconnected or if the connected peripheral transmitters are turned off, and the UART driving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the sys9
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
+0.3V T_IN EDGE DETECT FORCEOFF S 30sec TIMER R
R_IN
-0.3V
30s TIMER R
AUTOSHDN
INVALID
R_IN
EDGE DETECT
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30s.
FORCEON
Figure 3a. INVALID Functional Diagram, INVALID Low
Figure 3c. AutoShutdown Plus Logic
+2.7V
FORCEOFF
POWERDOWN*
R_IN
FORCEON 30s TIMER R INVALID AUTOSHDN
-2.7V
INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 30s.
* POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3b. INVALID Functional Diagram, INVALID High
Figure 3d. Power-Down Logic
Table 2. INVALID Truth Table
RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT Yes No INVALID OUTPUT High Low
(MAX3224E- MAX3227E) is driven low. The time required to exit shutdown is typically 100s (Figure 8). By connecting FORCEON to INVALID, the MAX3224E- MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level and no receiver or transmitter edge is detected for 30sec, and wake up when a valid receiver level or receiver or transmitter edge is detected. By connecting FORCEON and FORCEOFF to INVALID, the MAX3224E-MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level is detected and
tem saves power without changes to the existing BIOS or operating system. Figures 3a and 3b depict valid and invalid RS-232 receiver voltage levels. INVALID indicates the receiver input's condition, and is independent of FORCEON and FORCEOFF states. Figure 3 and Tables 1 and 2 summarize the operating modes of the MAX3224E- MAX3227E/MAX3244E/MAX3245E. FORCEON and FORCEOFF override AutoShutdown Plus circuitry. When neither control is asserted, the IC 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+ is pulled to VCC, V- is pulled to ground, the transmitter outputs are high impedance, and READY
INVALID HIGH +2.7V RECEIVER INPUT LEVELS INDETERMINATE +0.3V 0 -0.3V INDETERMINATE -2.7V INVALID HIGH
INVALID LOW
Figure 4a. Receiver Positive/Negative Thresholds for INVALID
10 ______________________________________________________________________________________
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
RECEIVER INPUTS
} REGION
INVALID
TRANSMITTER INPUTS
TRANSMITTER OUTPUTS VCC 0 *VCC OUTPUT 0 V+ VCC 0 V*MAX3224E-MAX3227E
INVALID OUTPUT
tINVL
tINVH tAUTOSHDN tWU
tAUTOSHDN tWU
Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram
wake up when a valid receiver level is detected (same functionality as AutoShutdown feature on MAX3221E/ MAX3223E/MAX3243E). A mouse or other system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3244E/ MAX3245E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232 ports on both systems remain enabled.
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.
POWERMANAGEMENT UNIT MASTER SHDN LINE 0.1F 1M
Software-Controlled Shutdown
If direct software control is desired, use INVALID to indicate DTR or Ring Indicator signal. Tie FORCEOFF and FORCEON together to bypass the AutoShutdown Plus so the line acts like a SHDN input.
FORCEOFF FORCEON
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 driver outputs and receiver inputs of the MAX3224E-MAX3227E/MAX3244E/MAX3245E have extra protection against static electricity. Maxim's engineers
MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E
Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another System
11
______________________________________________________________________________________
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE RC 50M to 100M CHARGE CURRENT LIMIT RESISTOR RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
Cs 150pF
STORAGE CAPACITOR
Figure 6a. Human Body ESD Test Model
Figure 7a. IEC1000-4-2 ESD Test Model
I IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM 10% I PEAK Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 100% 90%
Figure 6b. Human Body Current Waveform
t r = 0.7ns to 1ns t 30ns 60ns
ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits: 1) 15kV using the Human Body Model 2) 8kV using the contact-discharge method specified in IEC1000-4-2 3) 15kV using IEC1000-4-2's air-gap method.
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k resistor.
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. Human Body Model Figure 6a shows the Human Body Model and Figure 6b shows the current waveform it generates when discharged into a low impedance. This model consists of
12
IEC1000-4-2 The IEC1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3224E-MAX3227E, MAX3244E/MAX3245E help you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, without the need for additional ESD-protection components.
The major difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2, because series resistance is
______________________________________________________________________________________
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
lower in the IEC1000-4-2 model. Hence, the ESD withstand voltage measured to IEC1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7a shows the IEC1000-4-2 model and Figure 7b shows the current waveform for the 8kV, IEC1000-4-2, 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.
MAX3224E-MAX3227E/MAX3244E/MAX3245E
5V/div 0
FORCEON = FORCEOFF T1OUT
2V/div 0
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.
5V/div 0
VCC = 3.3V C1-C4 = 0.1F 5s/div
T2OUT READY
Figure 8. Transmitter Outputs when Exiting Shutdown or Powering Up
__________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 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).
When using the minimum required capacitor values, make sure the capacitor value does not degrade 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 that are sensitive to powersupply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.
Transmitter Outputs when Exiting Shutdown
Figure 8 shows two transmitter outputs when exiting 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 1000pF. 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 -3V.
Table 3. Required Minimum Capacitance Values
VCC (V) 3.0 to 3.6 3.15 to 3.6 4.5 to 5.5 3.0 to 5.5 C1, CBYPASS (F) 0.22 0.1 0.047 0.22 C2, C3, C4 (F) 0.22 0.1 0.33 1
______________________________________________________________________________________
13
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
High Data Rates
The MAX3224E/MAX3226E/MAX3244E maintain the RS-232 5.0V minimum transmitter output voltage even at high data rates. Figure 9 shows a transmitter loopback test circuit. Figure 10 shows a loopback test result at 120kbps, and Figure 11 shows the same test at 250kbps. For Figure 10, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 11, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 250pF. The MAX3225E/MAX3227E/MAX3245E maintain the RS-232 5.0V minimum transmitter output voltage at data rates up to 1Mbps (MegaBaud). Figure 12 shows a loopback test result with a single transmitter driven at 1Mbps and all transmitters loaded with an RS-232 receiver in parallel with 250pF.
T1IN 5V/div
5V/div T1OUT
R1OUT VCC = 3.3V 2s/div
5V/div
Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 120kbps
Mouse Driveability
The MAX3244E/MAX3245E are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3244E/MAX3245E successfully drove all serial mice tested and met their respective current and voltage requirements. The MAX3244E/
VCC CBYPASS VCC C1+ C1 C1C2+ C2 C2V+ C3*
T1IN
5V/div
T1OUT
5V/div
R1OUT VCC = 3.3V 2s/div
5V/div
MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E
Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 250kbps
VC4
T_ IN
T_ OUT
T1IN
5V/div
R_ OUT
R_ IN
T1OUT
FORCEON VCC FORCEOFF 5k 1000pF
5V/div
GND
R1OUT VCC = 3.3V
5V/div
*C3 CAN BE RETURNED TO VCC OR GND.
200ns/div
Figure 9. Loopback Test Circuit
14
Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test Result at 1Mbps
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
+3.3V 0.1F 28 C1 0.1F 24 1 C2 0.1F 2 14 C1+ C1C2+ C2T1IN T1OUT 9 +V 26 VCC V+ 27 C3 0.1F 3 VC4 0.1F
COMPUTER SERIAL PORT
MAX3244E MAX3245E
LOGIC INPUTS
13
T2IN
T2OUT
10
+V
12
T3IN
T3OUT
11
-V
20
R2OUTB
GND
19
R1OUT 5k
R1IN
4
Tx
18 LOGIC OUTPUTS 17
R2OUT 5k R3OUT 5k
R2IN
5
R3IN
6
RS-232 INPUTS
16
R4OUT 5k
R4IN
7
15 23 22
R5OUT 5k
R5IN
8
SERIAL MOUSE
FORCEON FORCEOFF INVALID
VCC TO POWERMANAGEMENT UNIT
21
GND 25
Figure 13a. Mouse Driver Test Circuit
______________________________________________________________________________________ 15
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
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 10 LOAD CURRENT PER TRANSMITTER (mA) VCC VOUTVOUTVOUT+ VCC = 3.0V VOUT+
MAX2343E-FIG15
6
MAX3245E dual charge pump ensures the transmitters will supply at least 5V during worst-case conditions. Figure 13b shows the transmitter output voltages under increasing load current. Figure 13a shows a typical mouse connection.
Interconnection with 3V and 5V Logic
The MAX3224E-MAX3227E/MAX3244E/MAX3245E 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 5 lists other Maxim ESD-powered transceivers.
Figure 13b. MAX324_E Transmitter Output Voltage vs. Load Current per Transmitter
Table 4. Logic Family Compatibility with Various Supply Voltages
SYSTEM POWER-SUPPLY VOLTAGE (V) 3.3 5 5 VCC SUPPLY VOLTAGE (V) 3.3 5 3.3 COMPATIBILITY 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
Table 5. 15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim
Part Supply Voltage Range (V) +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 +3.0 to +5.5 No. of Tx/Rx 3/5 3/5 3/5 3/5 2/2 2/2 2/2 2/2 2/2 1/1 1/1 1/1 Supply AutoAutoCurrent Shutdown Shutdown (A) Plus 300 1 1 1 300 300 1 1 1 1 1 1 -- -- Yes Yes -- -- -- Yes Yes -- Yes Yes -- Yes -- -- -- -- Yes -- -- Yes -- -- Human Body Model (kV) 15 15 15 15 15 15 15 15 15 15 15 15 IEC 1000-4-2 Contact Discharge (kV) 8 8 8 8 8 8 8 8 8 8 8 8 IEC 1000-4-2 Air-Gap Discharge (kV) 15 15 15 15 15 15 15 15 15 15 15 15 Guaranteed Data Rate (kbps) 250 250 250 1Mbps 250 250 250 250 1Mbps 250 250 1Mbps
MAX3241E MAX3243E MAX3244E MAX3245E MAX3232E MAX3222E MAX3223E MAX3224E MAX3225E MAX3221E MAX3226E MAX3227E
16
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15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
___________________________________________________Typical Operating Circuits
+3.3V +3.3V CBYPASS C1 0.1F 0.1F 2 C1+ 4 C15 C2 0.1F 6 C2+ C2T1OUT 13 15 VCC V+ 3 C3 0.1F 7 C4 0.1F C2 0.1F C1 0.1F CBYPASS 0.1F 28 C1+ 24 1 2 C1C2+ C2T1OUT 9 T2OUT 10 T3OUT 11 26 VCC V+ C3 0.1F 27
MAX3224E-MAX3227E/MAX3244E/MAX3245E
MAX3226E MAX3227E
V-
MAX3244E MAX3245E
V-
3 C4 0.1F
11 T1IN
14 T1IN 13 T2IN 12 T3IN TO POWERMANAGEMENT UNIT VCC 22 FORCEOFF 23 FORCEON 20 R2OUTB 19 R1OUT AUTOSHUTDOWN PLUS
9 R1OUT
R1IN 8 5k
1
READY
AUTOSHUTDOWN INVALID 10 PLUS FORCEOFF 16 GND 14
INVALID 21
12
FORCEON
R1IN 4
+3.3V CBYPASS C1 0.1F 0.1F 2 C1+ 4 C15 C2 0.1F 6 C2+ C2T1OUT 17 RS-232 OUTPUTS 15 R5OUT GND RS-232 INPUTS 9 25 R5IN 8 19 VCC V+ 3 C3 0.1F 7 C4 0.1F 16 R4OUT R4IN 7 17 R3OUT R3IN 6 18 R2OUT R2IN 5
MAX3224E MAX3225E
V-
13 T1IN TTL/CMOS INPUTS
12 T2IN
T2OUT 8
15 R1OUT TTL/CMOS OUTPUTS 10 R2OUT
R1IN 16 5k R2IN 5k TO POWERMANAGEMENT UNIT VCC
1
READY
AUTOSHUTDOWN INVALID 11 PLUS FORCEOFF 20 GND 18
14
FORCEON
______________________________________________________________________________________
17
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
___________________________________________________________Pin Configurations
READY 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2- 6 V- 7 R1IN 8
16 FORCEOFF 15 VCC 14 GND
C2+ 1 C2- 2 V- 3 R1IN 4 R2IN 5 R3IN 6 R4IN 7 R5IN 8 T1OUT 9 T2OUT 10 T3OUT 11
28 C1+ 27 V+ 26 VCC 25 GND
MAX3226E MAX3227E
13 T1OUT 12 FORCEON 11 T1IN 10 INVALID 9 R1OUT
MAX3244E MAX3245E
24 C123 FORCEON 22 FORCEOFF 21 INVALID 20 R2OUTB 19 R1OUT 18 R2OUT 17 R3OUT 16 R4OUT 15 R5OUT
SSOP
READY 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2- 6 V- 7 T2OUT 8
20 FORCEOFF 19 VCC 18 GND 17 T1OUT
T3IN 12 T2IN 13 T1IN 14
MAX3224E MAX3225E
16 R1IN 15 R1OUT 14 FORCEON 13 T1IN 12 T2IN 11 INVALID
SO/SSOP
R2IN 9 R2OUT 10
DIP/SSOP
_Ordering Information (continued)
PART MAX3226ECAE* MAX3226EEAE* MAX3227ECAE* MAX3227EEAE* MAX3244ECWI MAX3244ECAI MAX3244EEWI MAX3244EEAI MAX3245ECWI MAX3245ECAI MAX3245EEWI MAX3245EEAI TEMP. RANGE 0C to +70C -40C to +85C 0C to +70C -40C to +85C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 16 SSOP 16 SSOP 16 SSOP 16 SSOP 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP
___________________Chip Information
MAX3224E
TRANSISTOR COUNT: 1129
MAX3225E
TRANSISTOR COUNT: 1129
MAX3226E
TRANSISTOR COUNT: 1129
MAX3227E
TRANSISTOR COUNT: 1129
MAX3244E/MAX3245E
TRANSISTOR COUNT: 1335
*Future product. Contact factory for availability. 18 ______________________________________________________________________________________
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus
________________________________________________________Package Information
SSOP.EPS
MAX3224E-MAX3227E/MAX3244E/MAX3245E
______________________________________________________________________________________
SOICW.EPS
19
15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E-MAX3227E/MAX3244E/MAX3245E
___________________________________________Package Information (continued)
PDIPN.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.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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