Datasheet

±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
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/
MAX3245E dual charge pump ensures the transmitters
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, includ-
ing ACT and HCT CMOS. See Table 4 for more informa-
tion on possible combinations of interconnections.
Table 5 lists other Maxim ESD-powered transceivers.
SYSTEM
POWER-SUPPLY
VOLTAGE (V)
COMPATIBILITY
3.3 Compatible with all CMOS families
5 Compatible with all TTL and CMOS families
V
CC
SUPPLY
VOLTAGE
(V)
3.3
5
5 Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS3.3
PART
SUPPLY
VOLTAGE
RANGE
(V)
NO.
OF
Tx/Rx
GUARANTEED
DATA RATE
(kbps)
MAX3241E +3.0 to +5.5 3/5 250
MAX3243E +3.0 to +5.5 3/5 250
MAX3244E +3.0 to +5.5 3/5 250
MAX3245E +3.0 to +5.5 3/5 1Mbps
MAX3232E +3.0 to +5.5 2/2 250
MAX3222E +3.0 to +5.5 2/2 250
MAX3223E +3.0 to +5.5 2/2 250
MAX3224E +3.0 to +5.5 2/2 250
MAX3225E +3.0 to +5.5 2/2 1Mbps
MAX3221E +3.0 to +5.5 1/1 250
MAX3227E +3.0 to +5.5 1/1 1Mbps
MAX3226E +3.0 to +5.5 1/1 250
SUPPLY
CURRENT
(
µA)
300
1
1
1
300
300
1
1
1
1
1
1
Auto-
Shutdown
Plus
—
—
Yes
Yes
—
—
—
Yes
Yes
—
Yes
Yes
Auto-
Shutdown
—
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
Figure 13b. MAX324_E Transmitter Output Voltage vs. Load
Current per Transmitter
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
012345678910
MAX2343E-FIG15
LOAD CURRENT PER TRANSMITTER (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
V
OUT+
V
OUT-
V
CC
V
CC
= 3.0V
Table 5. ±15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim
Table 4. Logic Family Compatibility with Various Supply Voltages
Maxim Integrated
17
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E