19-1339; Rev 9; 2/07
±15kV ESD-Protected, 1µA, 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 automat-
ic shutdown/wakeup features, high data-rate capabili-
ties, 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 1µA supply current using Maxim’s
revolutionary AutoShutdown Plus™ 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 receiv-
er input. AutoShutdown Plus saves power without
changes to the existing BIOS or operating system.
The MAX3225E/MAX3227E/MAX3245E also feature
MegaBaud™ operation, guaranteeing 1Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224E/MAX3226E/MAX3244E guar-
antee 250kbps operation. The transceivers have a pro-
prietary 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 0.1µF capacitors for operation from a
3.3V supply. The MAX3224E–MAX3227E feature a logic-
level 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 TQFN,
SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/
MAX3245E) packages.
__Next Generation Device Features
♦
For Space-Constrained Applications:
MAX3228E/MAX3229E: ±15kV ESD-Protected,
+2.5V to +5.5V, RS-232 Transceivers in UCSP™
MAX3222E/MAX3232E/MAX3241E
†
/MAX3246E:
±15kV ESD-Protected, Down to 10nA, +3.0V to
+5.5V, Up to 1Mbps, True RS-232 Transceivers
(MAX3246E Available in UCSP)
♦
For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with ±15kV
ESD-Protected I/O and Logic Pins
MAX3224E–MAX3227E/MAX3244E/MAX3245E
†
Ordering Information
PART
MAX3224ECTP
MAX3224ECUP
MAX3224ECAP
MAX3224ECPP
MAX3224EETP
MAX3224EEUP
MAX3224EEAP
MAX3224EEPP
MAX3224EAAP
TEMP
RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
PIN
PKG
20 TQFN-
EP*
20 TSSOP
20 SSOP
20 Plastic
DIP
20 TQFN-
EP*
20 TSSOP
20 SSOP
20 Plastic
DIP
20 SSOP
PKG
CODE
T2055-5
—
—
—
T2055-5
—
—
—
—
*EP
= Exposed paddle.
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
†
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577;
Ordering Information continued at end of data sheet.
_____________________ Selector Guide
PART
NO. OF
GUARANTEED
READY
DRIVERS/
DATA RATE
OUTPUT
RECEIVERS
(bps)
2/2
2/2
1/1
1/1
3/5
3/5
250k
1M
250k
1M
250k
1M
✔
✔
✔
✔
—
—
Auto-
Shutdown
Plus
✔
✔
✔
✔
✔
✔
1
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other
patents pending.
AutoShutdown Plus, MegaBaud, and UCSP are trademarks of
Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
MAX3224E–MAX3227E/MAX3244E/MAX3245E
†
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
20-Pin TQFN (derate 21.3mW/°C above +70°C) ....1702.1mW
V+ to GND (Note 1) ..................................................-0.3V to +7V
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
V- to GND (Note 1) ...................................................+0.3V to -7V
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
V+ +
⏐V-⏐(Note
1) ................................................................+13V
20-Pin TSSOP (derate 10.9mW/°C above +70°C) .......879mW
Input Voltages
28-Pin Wide SO (derate 12.5mW/°C above +70°C)............1W
T_IN, FORCEON,
FORCEOFF
to GND ................ -0.3V to +6V
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
R_IN to GND ....................................................................±25V
28-Pin TSSOP (derate 12.8mW/°C above +70°C) .......1026mW
Output Voltages
36-Pin TQFN (derate 26.3mW/°C above +70°C)...........2105mW
T_OUT to GND.............................................................±13.2V
Operating Temperature Ranges
R_OUT,
INVALID,
READY to GND .........-0.3V to (V
CC
+ 0.3V)
MAX32_ _EC_ _ .................................................0°C to +70°C
Short-Circuit Duration
MAX32_ _EE_ _................................................-40°C to +85°C
T_OUT to GND .......................................................Continuous
MAX32_ _EAA_ ..............................................-40°C to +125°C
Continuous Power Dissipation (T
A
= +70°C)
Storage Temperature Range .............................-65°C to +160°C
16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW
Lead Temperature (soldering, 10s) .................................+300°C
16-Pin TSSOP (derate 9.4mW/°C above +70°C) ......754.7mW
16-Pin TQFN (derate 20.8mW/°C above +70°C) ....1666.7mW
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
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
1
= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
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
T
A
= +25°C
3
T
A
= +25°C
T
A
= +25°C
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 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
kΩ
T_IN, FORCEON,
FORCEOFF
R_OUT (MAX3244E/MAX3245E), receivers
disabled
I
OUT
= 1.6mA
I
OUT
= -1.0mA
V
CC
- 0.6 V
CC
- 0.1
T_IN, FORCEON,
FORCEOFF
T_IN, FORCEON,
FORCEOFF
V
CC
= 3.3V
V
CC
= 5.0V
2
2.4
0.5
±0.01
±0.05
±1
±10
0.4
0.8
V
V
V
µA
µA
V
V
SYMBOL
CONDITIONS
FORCEON = GND,
FORCEOFF
= V
CC
,
all R_IN idle, all T_IN idle
FORCEOFF
= GND
FORCEON =
FORCEOFF
= V
CC
, no load
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
(V
CC
= 3.3V or 5.0V, T
A
= +25°C)
1
1
0.3
10
10
1
µA
µA
mA
_______________________________________________________________________________________
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
1
= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
V
CC
= 0 or 3V to 5.5V, V
OUT
= ±12V,
Transmitters disabled
All transmitter outputs loaded with 3kΩ to
ground
V
CC
= V+ = V- = 0, transmitter outputs = ±2V
±5
300
±5.4
10M
±60
±25
V
Ω
mA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3224E–MAX3227E/MAX3244E/MAX3245E
†
MOUSE DRIVEABILITY
(MAX3244E/MAX3245E)
T1IN = T2IN = GND, T3IN = V
CC
,
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with
2.5mA each
IEC 1000-4-2 Air Discharge
R_IN, T_OUT
IEC 1000-4-2 Contact Discharge
Human Body Model
AutoShutdown Plus
(FORCEON = GND,
FORCEOFF
= V
CC
)
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
t
INVH
t
INVL
t
WU
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
I
OUT
= -1.6mA
0.4
V
I
OUT
= -1.0mA
V
CC
- 0.6
V
V
CC
= 5V, Figure 4b
V
CC
= 5V, Figure 4b
V
CC
= 5V, Figure 5b (Note 2)
15
1
30
100
30
60
µs
µs
µs
s
Receiver or Transmitter Edge to
t
AUTOSHDN
V
CC
= 5V, Figure 5b (Note 2)
Transmitters Shutdown
_______________________________________________________________________________________
3
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
MAX3224E–MAX3227E/MAX3244E/MAX3245E
†
TIMING CHARACTERISTICS—MAX3224E/MAX3226E/MAX3244E
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
1
= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
⏐
t
PHL
- t
PLH
⏐
⏐
t
PHL
- t
PLH
⏐
t
PHL
t
PLH
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3244E only)
Normal operation (MAX3244E only)
(Note 3)
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V, one trans-
mitter switching
MIN
250
0.15
0.15
200
200
100
50
C
L
= 150pF
to 1000pF
TYP
MAX
UNITS
kbps
µs
ns
ns
ns
ns
Transition-Region Slew Rate
6
30
V/µs
TIMING CHARACTERISTICS—MAX3225E/MAX3227E/MAX3245E
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
1
= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
Maximum Data Rate
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ,
C
L
= 250pF, one transmitter switching
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ,
C
L
= 1000pF, one transmitter switching
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Receiver Skew
⏐
t
PHL
- t
PLH
⏐
⏐
t
PHL
- t
PLH
⏐
t
PHL
t
PLH
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3245E only)
Normal operation (MAX3245E only)
(Note 3)
MIN
250
1000
1000
0.15
0.15
200
200
25
50
µs
ns
ns
ns
ns
V/µs
kbps
TYP
MAX
UNITS
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ, C
L
= 150pF to 1000pF,
Transition-Region Slew Rate
24
150
measured from +3V to -3V or -3V to +3V,
one transmitter switching
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
_______________________________________________________________________________________
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, 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/μs)
10
8
6
4
+SLEW
-SLEW
45
V
OUT+
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
V
OUT-
1000
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 = 3kΩ + C
L
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 = 3kΩ + C
L
1.5Mbps 1Mbps
2Mbps
80
70
60
SLEW RATE (V/μs)
-SLEW
50
+SLEW
40
30
20
10
0
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225E)
0
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
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
45
40
TRANSMITTER SKEW (ns)
35
30
25
20
15
10
5
0
0
500
1000
1500
2000
2500
AVERAGE: 10 PARTS
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225E)
LOAD = 3kΩ + C
L
38
36
READY TURN-ON TIME (μs)
34
32
30
28
26
24
22
20
200
3000
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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