Datasheet

PART
drove all serial mice tested and met their respective
current and voltage requirements. The MAX3244/
MAX3245 dual charge pump ensures the transmitters
will supply at least ±5V during worst-case conditions.
Figure 11a shows the transmitter output voltages under
increasing load current. Figure 11b shows a typical
mouse connection.
Interconnection with 3V and 5V Logic
The MAX3224–MAX3227/MAX3244/MAX3245 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 3.0V to 5.5V powered trans-
ceivers.
1µA Supply Current, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Table 4. Logic Family Compatibility with Various Supply Voltages
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
Table 5. 3.0V to 5.5V Powered RS-232 Transceivers from Maxim
SUPPLY
VOLTAGE
RANGE
(V)
NO.
OF
Tx/Rx
GUARANTEED
DATA RATE
(bps)
SUPPLY
CURRENT
(µA)
MAX3241 +3.0 to +5.5 3/5 120k300
MAX3243 +3.0 to +5.5 3/5 120k1
MAX3244 +3.0 to +5.5 3/5 250k1
MAX3245 +3.0 to +5.5 3/5 1M1
MAX3232 +3.0 to +5.5 2/2 120k300
MAX3222 +3.0 to +5.5 2/2 120k300
MAX3223 +3.0 to +5.5 2/2 120k1
MAX3224 +3.0 to +5.5 2/2 250k1
MAX3225 +3.0 to +5.5 2/2 1M1
MAX3221 +3.0 to +5.5 1/1 120k1
MAX3227 +3.0 to +5.5 1/1 1M1
MAX3226 +3.0 to +5.5 1/1 250k1
Auto-
Shutdown
Plus
—
—
Yes
Yes
—
—
—
Yes
Yes
—
Yes
Yes
Auto-
Shutdown
—
Yes
—
—
—
—
Yes
—
—
Yes
—
—
Maxim Integrated
15
MAX3224–MAX3227/MAX3244/MAX3245