Datasheet

MAX3221/MAX3223/MAX3243
1µA Supply-Current, True +3V to +5.5V
RS-232 Transceivers with AutoShutdown
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Figure 10. Loopback Test Result at 235kbps
T1IN
R1OUT
V
CC
= +3.3V, 235kbps
C1–C4 = 0.1µF
T1OUT
5V/div
5V/div
2µs/div
5V/div
MAX3221
MAX3223
MAX3243
5kΩ
R_ IN
R_ OUT
EN (MAX3221/3)
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3
C1
C2
0.1µF
V
CC
FORCEOFF
T_ OUT
T_ IN
GND
V
CC
0V
1000pF
Figure 8. Loopback Test Circuit
Figure 9. Loopback Test Result at 120kbps
T1IN
R1OUT
V
CC
= +3.3V, 120kbps
C1–C4 = 0.1µF
T1OUT
5V/div
5V/div
5V/div
5µs/div
Table 4. Logic Family Compatibility with
Various Supply Voltages
Table 3. Required Capacitor Values
V
CC
SUPPLY
VOLTAGE
(V)
COMPATIBILITY
3.3 3.3
Compatible with all CMOS
families.
5 5
Compatible with all TTL and
CMOS-logic families.
SYSTEM
POWER-
SUPPLY
VOLTAGE
(V)
5 3.3
Compatible with ACT and
HCT CMOS, and with TTL.
Incompatible with AC, HC,
or CD4000 CMOS.
V
CC
(V)
C1
(µF)
C2, C3, C4
(µF)
3.0 to 3.6 0.1 0.1
4.5 to 5.5 0.047 0.33
3.0 to 5.5 0.1 0.47