MAX202EPE Просмотр технического описания (PDF) - Maxim Integrated
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MAX202EPE Datasheet PDF : 23 Pages
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MAX200–MAX209/
MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1μF External Capacitors
+5V
0.1µF
0.1µF
0.1µF
0.1µF
C1+
VCC
V+
C1- MAX200-MAX209
C2+
MAX211
V-
MAX213
C2- +5V
400kΩ
TIN
T1 T0 T5 TOUT
0.1µF
2500pF
3kΩ
+5V
0.1µF
0.1µF
0.1µF
0.1µF
C1+
VCC
V+
C1- MAX200-MAX209
C2+
MAX211
V-
MAX213
C2- +5V
400kΩ
TIN
T1 T0 T5 TOUT
0.1µF
50pF
7kΩ
ROUT
R1 T0 R5
RIN
0V (+5V)
EN (EN)
5kΩ
0V (+5V)
SHDN (SHDN)
MINIMUM SLEW-RATE
TEST CIRCUIT
NOTE: ( ) ARE FOR MAX213.
Figure 3. Transition Slew-Rate Test Circuit
0V (+5V)
0V (+5V)
ROUT
R1 T0 R5
RIN
EN (EN)
5kΩ
SHDN (SHDN)
MAXIMUM SLEW-RATE
TEST CIRCUIT
V+ V+
S1
C1+ S2
S5
C2+ S6
VCC
GND
C1
C3
IL+
RL+ C2
C4
IL-
RL-
S3
S4
GND
C1-
VCC GND
S7
C2- S8
V-
200kHz
Figure 4. Dual Charge-Pump Diagram
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.
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