MAX203 MAXIM [Maxim Integrated Products], MAX203 Datasheet - Page 6

• Manufacturer Part Number: MAX203
• Description: +5V, RS-232 Transceivers with 0.1?F External Capacitors
• Manufacturer: MAXIM [Maxim Integrated Products]

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