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________________General Description
The MAX3224MAX3227/MAX3244/MAX3245 are 3V-
powered EIA/TIA-232 and V.28/V.24 communications
interfaces with automatic shutdown/wakeup features
and high data-rate capabilities.
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 receiv-
er input. AutoShutdown Plus saves power without
changes to the existing BIOS or operating system.
The MAX3225/MAX3227/MAX3245 also feature
MegaBaudTM operation, guaranteeing 1Mbps for high-
speed applications such as communicating with ISDN
modems. The MAX3224/MAX3226/MAX3244 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 MAX3224MAX3227 feature a logic-level output
(READY) that asserts when the charge pump is regulat-
ing 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
1A Supply Current
o
AutoShutdown Plus--EDN Innovation of the Year
o
Guaranteed Data Rate:
250kbps (MAX3224/3226/3244)
1Mbps (MAX3225/3227/3245)
o
Guaranteed Slew Rate:
6V/s (MAX3224/3226/3244)
24V/s (MAX3225/3227/3245)
o
Meets EIA/TIA-232 Specifications Down to 3.0V
o
Guaranteed Mouse Driveability (MAX3244/3245)
o
Ready-to-Transmit Logic-Level Output
MAX3224MAX3227/MAX3244/MAX3245
1A Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________________________________________________________
Maxim Integrated Products
1
19-1289; Rev 1; 3/98
PART
MAX3224
MAX3225
MAX3226
1/1
2/2
2/2
NO. OF
DRIVERS/
RECEIVERS
READY
OUTPUT
AUTO-
SHUTDOWN
PLUS
250k
1M
250k
GUARANTEED
DATA RATE
(bps)
MAX3227
MAX3244
MAX3245
3/5
3/5
1/1
--
--
1M
250k
1M
PART
MAX3224
CPP
MAX3224CAP
MAX3224EPP
-40C to +85C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
20 Plastic DIP
20 SSOP
20 Plastic DIP
MAX3224EAP
MAX3225
CPP
MAX3225CAP
0C to +70C
0C to +70C
-40C to +85C
20 SSOP
20 Plastic DIP
20 SSOP
MAX3225EPP
-40C to +85C
20 Plastic DIP
MAX3225EAP
-40C to +85C
20 SSOP
Ordering Information continued at end of data sheet.
AutoShutdownPlus 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
MAX3224MAX3227/MAX3244/MAX3245
1A Supply Current, 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 = 0.1F, tested at 3.3V 10%; C
L
= 0.047F, C2C4 = 0.33F, tested at 5.0V 10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25C.)
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
= +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_ _C_ _....................................................0C to +70C
MAX32_ _E_ _ ..................................................-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.
V
CC
= 5.0V
FORCEON = GND, FORCEOFF = V
CC
,
all R_IN idle, all T_IN idle
T
A
= +25C
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
A
1
10
Supply Current, Shutdown
A
1
10
Supply Current,
AutoShutdown Plus
A
0.05
10
Output Leakage Current
A
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
= +25C
V
CC
= 5.0V
V
CC
= 3.3V
T
A
= +25C
R_OUT (MAX3244/MAX3245), 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
= +25C)
LOGIC INPUTS AND RECEIVER OUTPUTS
RECEIVER INPUTS
Input Leakage Current
MAX3224MAX3227/MAX3244/MAX3245
1A Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, C1C4 = 0.1F, tested at 3.3V 10%; C
L
= 0.047F, C2C4 = 0.33F, tested at 5.0V 10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25C.)
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
s
100
t
WU
Receiver or Transmitter Edge to
Transmitters Enabled
s
30
t
INVL
Receiver Positive or Negative
Threshold to INVALID Low
s
1
t
INVH
Receiver Positive or Negative
Threshold to INVALID High
V
V
CC
- 0.6
INVALID, READY
(MAX3224MAX3227)
Output Voltage High
V
0.4
INVALID, READY
(MAX3224MAX3227)
Output Voltage Low
V
-0.3
0.3
Receiver Input Threshold to
INVALID Output Low
-2.7
V
2.7
Receiver Input Threshold to
INVALID Output High
V
5
Transmitter Output Voltage
A
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
V
CC
= 0 or 3V to 5.5V, V
OUT
= 12V,
Transmitters disabled
TRANSMITTER OUTPUTS
MOUSE DRIVEABILITY
(MAX3244/MAX3245)
AUTOSHUTDOWN PLUS
(FORCEON = GND, FORCEOFF = V
CC
)
MAX3224MAX3227/MAX3244/MAX3245
1A Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
4
_______________________________________________________________________________________
TIMING CHARACTERISTICS--MAX3224/MAX3226/MAX3244
(V
CC
= +3V to +5.5V, C1C4 = 0.1F, tested at 3.3V 10%; C
L
= 0.047F, C2C4 = 0.33F, tested at 5.0V 10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25C.)
TIMING CHARACTERISTICS--MAX3225/MAX3227/MAX3245
(V
CC
= +3V to +5.5V, C1C4 = 0.1F, tested at 3.3V 10%; C
L
= 0.047F, C2C4 = 0.33F, tested at 5.0V 10%; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25C.)
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
= +25C,
R
L
= 3k
to 7k
,
measured from +3V to -3V
or -3V to +3V
Normal operation (MAX3244 only)
Normal operation (MAX3244 only)
(Note 3)
CONDITIONS
0.15
t
PLH
s
0.15
t
PHL
kbps
250
Maximum Data Rate
Receiver Propagation Delay
V/s
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
= +25C,
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 (MAX3245 only)
Normal operation (MAX3245 only)
CONDITIONS
1000
1000
kbps
250
Maximum Data Rate
V/s
24
150
Transition-Region Slew Rate
ns
50
t
PHL
- t
PLH
Receiver Skew
ns
25
t
PHL
- t
PLH
Transmitter Skew
s
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
MAX3224MAX3227/MAX3244/MAX3245
1A Supply Current, 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
MAX3224/MAX3226
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 250kbps
T2 (MAX3224) TRANSMITTING AT 15.6kbps
V
OUT+
V
OUT-
0
2
4
6
8
10
12
14
16
0
1000
2000
3000
4000
5000
MAX3224/MAX3226
SLEW RATE vs. LOAD CAPACITANCE
MAX3224-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/
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
MAX3224/MAX3226
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 (MAX3224) TRANSMITTING AT 15.6kbps
-7.5
0
-2.5
-5.0
2.5
5.0
7.5
0
1000
500
1500
2000
2500
MAX3225/MAX3227
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224-04
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
(MAX3225)
LOAD = 3k
+ C
L
0
15
10
5
20
25
30
35
40
45
50
0
1000
500
1500
2000
2500
3000
MAX3225/MAX3227
TRANSMITTER SKEW vs.
LOAD CAPACITANCE
MAX3224-07
LOAD CAPACITANCE (pF)
TRANSMITTER SKEW (ns)
AVERAGE; 10 PARTS
1 TRANSMITTER AT 512kbps
1 TRANSMITTER AT 30kbps
(MAX3225)
LOAD = 3k
+ C
L
0
80
70
60
50
40
30
20
10
0
500
1000
1500
2000
2500
MAX3225/MAX3227
SLEW RATE vs. LOAD CAPACITANCE
MAX3224-05
LOAD CAPACITANCE (pF)
SLEW RATE (V/
s)
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225)
-SLEW
+SLEW
0
20
10
40
30
60
50
70
90
80
100
0
500
1000
1500
2000
2500
MAX3225/MAX3227
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3224-06
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2Mbps
1.5Mbps
1Mbps
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225)
LOAD = 3k
+ C
L
20
24
22
30
28
26
36
34
32
38
-40
0
20
-20
40
60
80
100
MAX3224MAX3227
READY TURN-ON TIME
vs. TEMPERATURE
MAX3224-08
TEMPERATURE (C)
READY TURN-ON TIME (
s)
0
200
180
160
140
120
100
80
60
40
20
-40
0
20
-20
40
60
80
100
MAX3224MAX3227
READY TURN-OFF TIME
vs. TEMPERATURE
MAX3224-09
TEMPERATURE (C)
READY TURN-OFF TIME (ns)
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, C1C4 = 0.1F, all transmitters loaded with 3k
and C
L
, T
A
= +25C, unless otherwise noted.)
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