MAX200–MAX209/
MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1μF External Capacitors
0.1µF
0.1µF
+5V
+5V
0.1µF
0.1µF
V
V
CC
C1+
V+
V-
C1+
V+
V-
CC
0.1µF
0.1µF
0.1µF
0.1µF
C1-
C2+
C1-
C2+
MAX200-MAX209
MAX211
MAX200-MAX209
MAX211
0.1µF
0.1µF
MAX213
MAX213
+5V
+5V
C2-
C2-
400kΩ
400kΩ
T1 T0 T5
T1 T0 T5
T
OUT
T
OUT
T
T
IN
IN
2500pF
50pF
3kΩ
7kΩ
R1 T0 R5
R1 T0 R5
R
R
R
R
IN
OUT
IN
OUT
EN (EN)
EN (EN)
5kΩ
5kΩ
0V (+5V)
0V (+5V)
0V (+5V)
0V (+5V)
SHDN (SHDN)
SHDN (SHDN)
MINIMUM SLEW-RATE
MAXIMUM SLEW-RATE
TEST CIRCUIT
TEST CIRCUIT
NOTE: ( ) ARE FOR MAX213.
Figure 3. Transition Slew-Rate Test Circuit
V+ V+
S1
C1+ S2
S5
C2+ S6
V
GND
CC
I +
L
R +
L
C1
C3
C2
I -
L
R -
L
C4
S3
S4
C1-
GND
V
GND
V-
CC
S7
C2- S8
200kHz
Figure 4. Dual Charge-Pump Diagram
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.
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.
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.
Maxim Integrated
│ 6
www.maximintegrated.com
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