Datasheet

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
Figure 7. Loopback Test Circuit
2µs/div
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
V
CC
= 3.3V
C1–C4 = 0.1µF
Figure 8. MAX3241E Loopback Test Result at 120kbps
2µs/div
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
V
CC
= 3.3V, C1–C4 = 0.1µF
Figure 9. MAX3241E Loopback Test Result at 250kbps
+5V
0
+5V
0
-5V
+5V
0
T_IN
T_OUT
5kΩ + 250pF
R_OUT
400ns/div
V
CC
= 3.3V
C1–C4 = 0.1µF
Figure 10. MAX3237E Loopback Test Result at 1000kbps
(MBAUD = V
CC
)
MAX3222E
MAX3232E
MAX3237E
MAX3241E
MAX3246E
5kΩ
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3
C1
C2
0.1µF
V
CC
T_ OUT
T_ IN
GND
1000pF
Transmitter Outputs Recovering
from Shutdown
Figure 3 shows two transmitter outputs recovering from
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 levels
(one transmitter input is high; the other is low). Each
transmitter is loaded with 3kΩ in parallel with 2500pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3.0V.
Mouse Drivability
The MAX3241E is designed to power serial mice while
operating from low-voltage power supplies. It has
been tested with leading mouse brands from manu-
facturers such as Microsoft and Logitech. The
MAX3241E successfully drove all serial mice tested
and met their current and voltage requirements.
14
Maxim Integrated
MAX3222E/MAX3232E/MAX3237E/
MAX3241E/MAX3246E