MAX3221-MAX3243 Maxim, MAX3221-MAX3243 Datasheet - Page 11

• Manufacturer Part Number: MAX3221-MAX3243
• Description: 1A Supply Current / True +3V to +5.5V RS 232 Transceiver with AutoShutdown
• Manufacturer: Maxim

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