MAX200 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX200 Datasheet PDF : 23 Pages
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MAX200–MAX209/
MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1μF External Capacitors
TWO TRANSMITTER
OUTPUTS:
ONE HIGH, ONE LOW
SHDN*
SHUTDOWN
TRANSMITTERS ON
THREE TRANSMITTERS LOADED WITH 3kΩ||2500pF.
*SHUTDOWN POLARITY REVERSED FOR MAX213.
Figure 5. Transmitter Outputs When Exiting Shutdown
Shutdown and Enable Control
In shutdown mode, the MAX200/MAX205/MAX206/
MAX211/MAX213 charge pumps are turned off, V+ is
pulled down to VCC, V- is pulled to ground, and the trans-
mitter outputs are disabled. This reduces supply current
typically to 1μA (15μA for the MAX213). The time required
to exit shutdown is 1ms, as shown in Figure 5.
All receivers except R4 and R5 on the MAX213 are put
into a high-impedance state in shutdown mode. The
MAX213’s R4 and R5 receivers still function in shutdown
mode. These two receivers are useful for monitoring
external activity while maintaining minimal power con-
sumption.
The enable control is used to put the receiver outputs into
a high-impedance state, so that the receivers can be con-
nected directly to a three-state bus. It has no effect on the
RS-232 drivers or on the charge pumps.
MAX213 Receiver Operation in Shutdown
During normal operation, the MAX213’s receiver propa-
gation delay is typically 1µs. When entering shutdown
with receivers active, R4 and R5 are not valid until 80µs
after SHDN is driven low. In shutdown mode, propagation
delays increase to 4µs for a high-to-low or a low-to-high
transition.
When exiting shutdown, all receiver outputs are invalid
until the charge pumps reach nominal values (< 2ms
when using 0.1µF capacitors).
Table 1a. MAX200 Control Pin Configurations
SHDN
0
1
OPERATION STATUS
Normal Operation
Shutdown
TRANSMITTERS T1–T5
All Active
All High-Z
Table 1b. MAX205/MAX206/MAX211 Control Pin Configurations
SHDN
EN
0
0
0
1
1
0
OPERATION STATUS
Normal Operation
Normal Operation
Shutdown
TRANSMITTERS T1–T5
All Active
All Active
All High-Z
RECEIVERS R1–R5
All Active
All High-Z
All High-Z
Table 1c. MAX213 Control Pin Configurations
SHDN
EN
OPERATION STATUS
0
0
Shutdown
0
1
Shutdown
1
0
Normal Operation
1
1
Normal Operation
*Active = active with reduced performance.
TRANSMITTERS T1–T4
All High-Z
All High-Z
All Active
All Active
RECEIVERS
R1, R2, R3
High-Z
High-Z
High-Z
Active
R4, R5
High-Z
Active*
High-Z
Active
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