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________________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 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 receiv-
er 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 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 MAX3224EMAX3227E 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 SSOP pack-
age.
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
Cellular Phones
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
____________________________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
1µA 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/µs (MAX3224E/3226E/3244E)
24V/µs (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
MAX3224EMAX3227E/MAX3244E/MAX3245E
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________________________________________________________
Maxim Integrated Products
1
19-1339; Rev 0; 1/98
PART
MAX3224E
MAX3225E
MAX3226E
1/1
2/2
2/2
NO. OF
DRIVERS/
RECEIVERS
READY
OUTPUT
AUTO-
SHUTDOWN
PLUS
250k
1M
250k
GUARANTEED
DATA RATE
(bps)
MAX3227E
MAX3244E
MAX3245E
3/5
3/5
1/1
--
--
1M
250k
1M
PART
MAX3224E
CPP
MAX3224ECAP
MAX3224EEPP
-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
20 Plastic DIP
20 SSOP
20 Plastic DIP
MAX3224EEAP
MAX3225E
CPP
MAX3225ECAP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
20 SSOP
20 Plastic DIP
20 SSOP
MAX3225EEPP
-40°C to +85°C
20 Plastic DIP
MAX3225EEAP
-40°C to +85°C
20 SSOP
Ordering Information continued at end of data sheet.
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.
_____________________ Selector Guide
_______________Ordering Information
MAX3224EMAX3227E/MAX3244E/MAX3245
E
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3V to +5.5V, C1C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 0.047µF, C2C4 = 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.)
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.
V
CC
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 (V
CC
+ 0.3V)
Short-Circuit Duration
T_OUT to GND .......................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C)........... 1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
Operating Temperature Ranges
MAX32_ _EC_ _ .................................................0°C to +70°C
MAX32_ _EE_ _................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
V
CC
= 5.0V
FORCEON = GND, FORCEOFF = V
CC
,
all R_IN idle, all T_IN idle
T
A
= +25°C
V
CC
= 3.3V
T_IN, FORCEON,
FORCEOFF
CONDITIONS
k
3
5
7
Input Resistance
V
0.5
Input Hysteresis
1.8
2.4
V
1.5
2.4
Input Threshold High
0.8
1.5
V
0.6
1.2
Input Threshold Low
V
-25
+25
Input Voltage Range
V
V
CC
- 0.6 V
CC
- 0.1
Output Voltage High
V
0.4
Output Voltage Low
µA
1
10
Supply Current, Shutdown
µA
1
10
Supply Current,
AutoShutDown Plus
µA
±0.05
±10
Output Leakage Current
µA
±0.01
±1
Transmitter Input Hysteresis
V
0.5
V
2.4
Input Logic Threshold High
mA
0.3
1
Supply Current,
AutoShutDown Plus Disabled
V
0.8
Input Logic Threshold Low
2
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
FORCEOFF = GND
T
A
= +25°C
V
CC
= 5.0V
V
CC
= 3.3V
T
A
= +25°C
R_OUT (MAX3244E/MAX3245E), receivers
disabled
T_IN, FORCEON, FORCEOFF
V
CC
= 5.0V
FORCEON = FORCEOFF = V
CC
, no load
T_IN, FORCEON, FORCEOFF
I
OUT
= -1.0mA
V
CC
= 3.3V
I
OUT
= 1.6mA
DC CHARACTERISTICS
(V
CC
= 3.3V or 5.0V, T
A
= +25°C)
LOGIC INPUTS AND RECEIVER OUTPUTS
RECEIVER INPUTS
Input Leakage Current
MAX3224EMAX3227E/MAX3244E/MAX3245
E
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, C1C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 0.047µF, C2C4 = 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.)
CONDITIONS
300
10M
Output Resistance
V
±5
±5.4
Output Voltage Swing
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Figure 4a
T1IN = T2IN = GND, T3IN = V
CC
,
T3OUT loaded with 3k
to GND,
T1OUT and T2OUT loaded with
2.5mA each
sec
15
30
60
t
AUTOSHDN
Receiver or Transmitter Edge to
Transmitters Shutdown
µs
100
t
WU
Receiver or Transmitter Edge to
Transmitters Enabled
µs
30
t
INVL
Receiver Positive or Negative
Threshold to INVALID Low
µs
1
t
INVH
Receiver Positive or Negative
Threshold to INVALID High
V
V
CC
- 0.6
INVALID, READY
Output Voltage High
(MAX3224EMAX3227E)
V
0.4
INVALID, READY
Output Voltage Low
(MAX3224EMAX3227E)
V
-0.3
0.3
Receiver Input Threshold to
INVALID Output Low
-2.7
V
2.7
Receiver Input Threshold to
INVALID Output High
±15
±8
R_IN, T_OUT
kV
±15
V
±5
Transmitter Output Voltage
µA
±25
Output Leakage Current
±60
mA
Output Short-Circuit Current
V
CC
= V+ = V- = 0, transmitter outputs = ±2V
All transmitter outputs loaded with 3k
to
ground
V
CC
= 5V, Figure 5b (Note 2)
V
CC
= 5V, Figure 5b (Note 2)
V
CC
= 5V, Figure 4b
V
CC
= 5V, Figure 4b
I
OUT
= -1.0mA
I
OUT
= -1.6mA
Figure 4a
Negative threshold
Positive threshold
Human Body Model
V
CC
= 0 or 3V to 5.5V, V
OUT
= ±12V,
Transmitters disabled
IEC1000-4-2 Contact Discharge
IEC1000-4-2 Air Discharge
TRANSMITTER OUTPUTS
MOUSE DRIVEABILITY
(MAX3244E/MAX3245E)
ESD PROTECTION
AUTOSHUTDOWN PLUS
(FORCEON = GND, FORCEOFF = V
CC
)
MAX3224EMAX3227E/MAX3244E/MAX3245
E
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
4
_______________________________________________________________________________________
TIMING CHARACTERISTICS--MAX3224E/MAX3226E/MAX3244E
(V
CC
= +3V to +5.5V, C1C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 0.047µF, C2C4 = 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.)
TIMING CHARACTERISTICS--MAX3225E/MAX3227E/MAX3245E
(V
CC
= +3V to +5.5V, C1C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 0.047µF, C2C4 = 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.)
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.
C
L
= 150pF
to 2500pF
C
L
= 150pF
to 1000pF
R_IN to R_OUT, C
L
= 150pF
R
L
= 3k
, C
L
= 1000pF,
one transmitter switching
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3k
to 7k
,
measured from +3V to -3V
or -3V to +3V
Normal operation (MAX3244E only)
Normal operation (MAX3244E only)
(Note 3)
CONDITIONS
0.15
t
PLH
µs
0.15
t
PHL
kbps
250
Maximum Data Rate
Receiver Propagation Delay
V/µs
4
30
6
30
Transition-Region Slew Rate
ns
200
Receiver Output Enable Time
ns
200
Receiver Output Disable Time
ns
100
t
PHL
- t
PLH
Transmitter Skew
ns
50
t
PHL
- t
PLH
Receiver Skew
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
CC
= 4.5V to 5.5V, R
L
= 3k
,
C
L
= 1000pF, one transmitter switching
V
CC
= 3.0V to 4.5V, R
L
= 3k
,
C
L
= 250pF, one transmitter switching
R
L
= 3k
, C
L
= 1000pF,
one transmitter switching
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3k
to 7k
, C
L
= 150pF to 1000pF,
measured from +3V to -3V or -3V to +3V
(Note 3)
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3245E only)
Normal operation (MAX3245E only)
CONDITIONS
1000
1000
kbps
250
Maximum Data Rate
V/µs
24
150
Transition-Region Slew Rate
ns
50
t
PHL
- t
PLH
Receiver Skew
ns
25
t
PHL
- t
PLH
Transmitter Skew
µs
0.15
t
PHL
Receiver Propagation Delay
0.15
t
PLH
ns
200
Receiver Output Enable Time
ns
200
Receiver Output Disable Time
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX3224EMAX3227E/MAX3244E/MAX3245
E
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
_______________________________________________________________________________________
5
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0
1000
2000
3000
4000
5000
MAX3224E/MAX3226E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224-7/44/45E-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
V
OUT+
V
OUT-
0
2
4
6
8
10
12
14
16
0
1000
2000
3000
4000
5000
MAX3224E/MAX3226E
SLEW RATE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/
µ
s)
-SLEW
+SLEW
FOR DATA RATES UP TO 250kbps
0
5
10
15
20
25
30
35
40
45
0
2000
1000
3000
4000
5000
MAX3224E/MAX3226E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224-7/44/45E-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 (MAX3224E) TRANSMITTING AT 15.6kbps
-7.5
0
-2.5
-5.0
2.5
5.0
7.5
0
1000
500
1500
2000
2500
MAX3225E/MAX3227E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224-7/44/45E-04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
2Mbps
2Mbps
1.5Mbps
1.5Mbps
1Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225E)
LOAD = 3k
+ C
L
0
15
10
5
20
25
30
35
40
45
50
0
1000
500
1500
2000
2500
3000
MAX3225E/MAX3227E
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
MAX3224-7/44/45E-07
LOAD CAPACITANCE (pF)
TRANSMITTER SKEW (ns)
AVERAGE; 10 PARTS
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225E)
LOAD = 3k
+ C
L
0
80
70
60
50
40
30
20
10
0
500
1000
1500
2000
2500
MAX3225E/MAX3227E
SLEW RATE vs. LOAD CAPACITANCE
MAX3224-7/44/45E-05
LOAD CAPACITANCE (pF)
SLEW RATE (V/
µ
s)
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225E)
-SLEW
+SLEW
0
20
10
40
30
60
50
70
90
80
100
0
500
1000
1500
2000
2500
MAX3225E/MAX3227E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224-7/44/45E-06
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2Mbps
1.5Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225E)
LOAD = 3k
+ C
L
20
24
22
30
28
26
36
34
32
38
-40
0
20
-20
40
60
80
100
MAX3224EMAX3227E
READY TURN-ON TIME
vs. TEMPERATURE
MAX3224-7/44/45E-08
TEMPERATURE (°C)
READY TURN-ON TIME (
µ
s)
0
200
180
160
140
120
100
80
60
40
20
-40
0
20
-20
40
60
80
100
MAX3224EMAX3227E
READY TURN-OFF TIME
vs. TEMPERATURE
MAX3224-7/44/45E-09
TEMPERATURE (°C)
READY TURN-OFF TIME (ns)
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k
and C
L
, T
A
= +25°C, unless otherwise noted.)
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