Datasheet

RS-232 Receivers
The receivers convert RS-232 signals to CMOS logic
output levels. Receiver outputs are inverting, maintaining
compatibility with driver outputs. The guaranteed receiver
input thresholds of +0.8V and +2.4V are significantly
tighter than the ±3.0V threshold required by the EIA/TIA-
232E specification. This allows receiver inputs to respond
to TTL/CMOS logic levels and improves noise margin for
RS-232 levels.
The MAX200–MAX209/MAX211/MAX213 guaranteed
+0.8V threshold (+0.6V in shutdown for the MAX213)
ensures that receivers shorted to ground have a logic 1
output. Also, the 5kΩ input resistance to ground ensures
that a receiver with its input left open also has a logic 1
output.
Receiver inputs have approximately +0.5V hysteresis.
This provides clean output transitions, even with slow rise
and fall time input signals with moderate amounts of noise
and ringing. In shutdown, the MAX213 receivers R4 and
R5 have no hysteresis.
Figure 3. Transition Slew-Rate Test Circuit
Figure 4. Dual Charge-Pump Diagram
MAX200–MAX209/
MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1μF External Capacitors
www.maximintegrated.com
Maxim Integrated │ 6
+5V
0V (+5V)
0V (+5V)
0.1µF
0.1µF
0.1µF
C1+
C1-
C2+
C2-
400kΩ
3kΩ
2500pF
5kΩ
V
CC
V+
V-
T
IN
+5V
T1 T0 T5
R1 T0 R5
T
OUT
R
IN
0.1µF
R
OUT
SHDN (SHDN)
EN (EN)
MAX200-MAX209
MAX211
MAX213
+5V
0V (+5V)
MAXIMUM SLEW-RATE
TEST CIRCUIT
MINIMUM SLEW-RATE
TEST CIRCUIT
NOTE: ( ) ARE FOR MAX213.
0V (+5V)
0.1µF
0.1µF
0.1µF
C1+
C1-
C2+
C2-
400kΩ
7kΩ
50pF
5kΩ
V
CC
V+
V-
T
IN
+5V
T1 T0 T5
R1 T0 R5
T
OUT
R
IN
0.1µF
R
OUT
SHDN (SHDN)
EN (EN)
MAX200-MAX209
MAX211
MAX213
0.1µF 0.1µF
V+ V+
S5S1 S2C1+ S6C2+
I
L
+
C3
C2
C4
GND
R
L
-
V-
S7
S8
GND
V
CC
I
L
-
R
L
+
C2-
C1
V
CC
200kHz
S3 S4
C1-
GND