+5V, 1µA, Single RS-232 Transceiver
with AutoShutdown
MAX221
5V/div
TIN = GND
FORCEON =
FORCEOFF
5V/div
TIN
5V/div
TOUT
5V/div
TOUT
TIN = V
CC
5V/div
ROUT
50µs/div
2µs/div
Figure 5. Transmitter Output Exiting Shutdown or
Powering Up
Figure 7. Loopback Test Result at 120kbps
+5V
0.1µF
C3
C1+
C1
C1-
C2+
C2
C2-
TIN
ROUT
0V
V
CC
EN
FORCEOFF
FORCEON
5k
1000pF
GND
INVALID
TOUT
RIN
5V/div
ROUT
V
CC
5V/div
TIN
V+
5V/div
V-
C4
TOUT
MAX221
2µs/div
Figure 8. Loopback Test Result at 250kbps
___________________Chip Information
TRANSISTOR COUNT: 157
Figure 6. Loopback Test Circuit
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
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