MAX200–MAX209/MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1µF External Capacitors
0.1FF
+5V
0.1FF
C1+
0.1FF
C1-
C2+
0.1FF
C2-
400kI
T
IN
T1 T0 T5
T
OUT
2500pF
3kI
R1 T0 R5
R1 T0 R5
7kI
V
CC
V+
0.1FF
+5V
0.1FF
C1+
C1-
C2+
0.1FF
C2-
400kI
T
IN
T1 T0 T5
T
OUT
50pF
V
CC
V+
0.1FF
+5V
MAX200-MAX209
MAX211
MAX213
V-
0.1FF
+5V
MAX200-MAX209
MAX211
MAX213
V-
0.1FF
R
OUT
EN (EN)
R
IN
5kI
R
OUT
EN (EN)
R
IN
5kI
0V (+5V)
0V (+5V)
0V (+5V)
0V (+5V)
SHDN (SHDN)
MINIMUM SLEW-RATE
TEST CIRCUIT
NOTE:
( ) ARE FOR MAX213.
SHDN (SHDN)
MAXIMUM SLEW-RATE
TEST CIRCUIT
Figure 3. Transition Slew-Rate Test Circuit
V+
V+
V
CC
S1
C1+ S2
S5
R
L
+
C2+ S6
GND
I
L
-
C1
S3
S4
C1-
200kHz
C3
I
L
+
C2
C4
R
L
-
V-
GND
V
CC
GND
S7
C2- S8
Figure 4. Dual Charge-Pump Diagram
The receivers convert RS-232 signals to CMOS logic
output levels. Receiver outputs are inverting, maintain-
ing compatibility with driver outputs. The guaranteed
receiver input thresholds of +0.8V and +2.4V are signifi-
cantly tighter than the
Q3.0V
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.
RS-232 Receivers
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 5kI 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.
Maxim Integrated
6
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
