±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E
Table 3. Logic-Family Compatibility with
Various Supply Voltages
SYSTEM
POWER-SUPPLY
VOLTAGE
(V)
3.3
T1IN
5V/div
V
CC
SUPPLY
VOLTAGE
(V)
3.3
COMPATIBILITY
5V/div
Compatible with all
CMOS families
Compatible with all
TTL and CMOS fami-
lies
Compatible with ACT
and HCT CMOS, and
with AC, HC, or
CD4000 CMOS
T1OUT
5
5
R1OUT
V
CC
= 3.3V
C1–C4 = 0.1µF
2µs/div
5V/div
5
3.3
Figure 8. MAX3241E Loopback Test Result at 120kbps
V
CC
0.1µF
T1IN
5V/div
V
CC
C1+
C1
C1-
C2+
C2
C2-
V+
C3
T1OUT
5V/div
MAX3222E
MAX3232E
MAX3237E
MAX3241E
V-
C4
R1OUT
V
CC
= 3.3V, C1–C4 = 0.1µF
2µs/div
5V/div
T_ IN
T_ OUT
Figure 9. MAX3241E Loopback Test Result at 250kbps
R_ OUT
R_ IN
5kΩ
1000pF
+5V
0
T_IN
GND
+5V
0
-5V
V
CC
= 3.3V
C1–C4 = 0.1µF
T_OUT
5kΩ + 250pF
Figure 7. Loopback Test Circuit
+5V
0
R_OUT
400ns/div
Figure 10. MAX3237E Loopback Test Result at 1000kbps
(MBAUD = V
CC
)
______________________________________________________________________________________
13
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
