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19-1289; Rev 1; 3/98
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
________________General Description
The MAX3224–MAX3227/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 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 MAX3225/MAX3227/MAX3245 also feature
MegaBaud™ 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 0.1µF capacitors for operation from a 3.3V supply.
The MAX3224–MAX3227 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.
____________________________Features
o
1µA 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/µs (MAX3224/3226/3244)
24V/µs (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
MAX3224–MAX3227/MAX3244/MAX3245
†
_______________Ordering Information
PART
MAX3224CPP
MAX3224CAP
MAX3224EPP
MAX3224EAP
MAX3225CPP
MAX3225CAP
MAX3225EPP
MAX3225EAP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
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
AUTO-
READY
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
—
—
MAX3224
MAX3225
MAX3226
MAX3227
MAX3244
MAX3245
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.
________________________________________________________________
Maxim Integrated Products
1
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.
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
MAX3224–MAX3227/MAX3244/MAX3245
ABSOLUTE MAXIMUM RATINGS
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_ _C_ _....................................................0°C to +70°C
MAX32_ _E_ _ ..................................................-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.
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
L
= 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 (MAX3244/MAX3245), 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
_______________________________________________________________________________________
1µA Supply Current, 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
L
= 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
MAX3224–MAX3227/MAX3244/MAX3245
MOUSE DRIVEABILITY
(MAX3244/MAX3245)
T1IN = T2IN = GND, T3IN = V
CC
,
T3OUT loaded with 3kΩ to GND,
Transmitter Output Voltage
T1OUT and T2OUT loaded with
2.5mA each
AUTOSHUTDOWN PLUS
(FORCEON = GND,
FORCEOFF
= V
CC
)
Receiver Input Threshold to
INVALID
Output High
Receiver Input Threshold to
INVALID
Output Low
INVALID,
READY
(MAX3224–MAX3227)
Output Voltage Low
INVALID,
READY
(MAX3224–MAX3227)
Output Voltage High
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
±5
V
2.7
V
V
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
sec
Receiver or Transmitter Edge to
t
AUTOSHDN
V
CC
= 5V, Figure 5b (Note 2)
Transmitters Shutdown
_______________________________________________________________________________________
3
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
MAX3224–MAX3227/MAX3244/MAX3245
TIMING CHARACTERISTICS—MAX3224/MAX3226/MAX3244
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 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 (MAX3244 only)
Normal operation (MAX3244 only)
(Note 3)
C
L
= 150pF
to 1000pF
C
L
= 150pF
to 2500pF
MIN
250
0.15
0.15
200
200
100
50
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ,
measured from +3V to -3V
or -3V to +3V
6
4
30
V/µs
30
TYP
MAX
UNITS
kbps
µs
ns
ns
ns
ns
Transition-Region Slew Rate
TIMING CHARACTERISTICS—MAX3225/MAX3227/MAX3245
(V
CC
= +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C
L
= 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
Transition-Region Slew Rate
t
PHL
- t
PLH
t
PHL
- t
PLH
t
PHL
t
PLH
R_IN to R_OUT, C
L
= 150pF
Normal operation (MAX3245 only)
Normal operation (MAX3245 only)
(Note 3)
V
CC
= 3.3V, T
A
= +25°C,
R
L
= 3kΩ to 7kΩ, C
L
= 150pF to 1000pF,
measured from +3V to -3V or -3V to +3V
MIN
250
1000
1000
0.15
0.15
200
200
25
50
24
150
µs
ns
ns
ns
ns
V/µs
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
_______________________________________________________________________________________
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3224/MAX3226
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
0
MAX3224-01
MAX3224–MAX3227/MAX3244/MAX3245
MAX3224/MAX3226
SLEW RATE vs. LOAD CAPACITANCE
MAX3224-02
MAX3224/MAX3226
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
40
SUPPLY CURRENT (mA)
35
30
25
20
15
10
20kbps
250kbps
120kbps
MAX3224-03
16
14
12
SLEW RATE (V/µs)
10
8
6
4
+SLEW
-SLEW
45
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT+
T1 TRANSMITTING AT 250kbps
T2 (MAX3224) 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 (MAX3224) TRANSMITTING AT 15.6kbps
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225/MAX3227
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3224-04
MAX3225/MAX3227
SLEW RATE vs. LOAD CAPACITANCE
MAX3224-05
MAX3225/MAX3227
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
(MAX3225)
LOAD = 3kΩ + C
L
2Mbps
1.5Mbps
MAX3224-06
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
80
70
60
SLEW RATE (V/µs)
-SLEW
50
+SLEW
40
30
20
10
0
1 TRANSMITTER AT 1Mbps
1 TRANSMITTER AT 62.5kbps (MAX3225)
0
500
1000
1500
2000
100
1 TRANSMITTER AT FULL DATA RATE
1 TRANSMITTER AT 1/16 DATA RATE
(MAX3225)
LOAD = 3kΩ + C
L
1.5Mbps 1Mbps
2Mbps
10
0
2500
0
500
1000
1500
2000
2500
LOAD CAPACITANCE (pF)
2500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3225/MAX3227
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
(MAX3225)
LOAD = 3kΩ + C
L
MAX3224-07
MAX3224–MAX3227
READY TURN-ON TIME
vs. TEMPERATURE
MAX3224-08
MAX3224–MAX3227
READY TURN-OFF TIME
vs. TEMPERATURE
180
READY TURN-OFF TIME (ns)
160
140
120
100
80
60
40
20
0
MAX3224-09
50
38
36
READY TURN-ON TIME (µs)
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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