Datasheet

Shutdown and Enable Control
In shutdown mode, the MAX200/MAX205/MAX206/
MAX211/MAX213 charge pumps are turned off, V+ is
pulled down to V
CC
, 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
*Active = active with reduced performance.
Table 1b. MAX205/MAX206/MAX211 Control Pin Configurations
Table 1c. MAX213 Control Pin Configurations
Figure 5. Transmitter Outputs When Exiting Shutdown
SHDN OPERATION STATUS TRANSMITTERS T1–T5
0 Normal Operation All Active
1 Shutdown All High-Z
SHDN EN OPERATION STATUS TRANSMITTERS T1–T5 RECEIVERS R1–R5
0 0 Normal Operation All Active All Active
0 1 Normal Operation All Active All High-Z
1 0 Shutdown All High-Z All High-Z
SHDN EN OPERATION STATUS TRANSMITTERS T1–T4
RECEIVERS
R1, R2, R3 R4, R5
0 0 Shutdown All High-Z High-Z High-Z
0 1 Shutdown All High-Z High-Z Active*
1 0 Normal Operation All Active High-Z High-Z
1 1 Normal Operation All Active Active Active
MAX200–MAX209/
MAX211/MAX213
+5V, RS-232 Transceivers
with 0.1μF External Capacitors
www.maximintegrated.com
Maxim Integrated │ 7
TWO TRANSMITTER
OUTPUTS:
ONE HIGH, ONE LOW
SHDN*
THREE TRANSMITTERS LOADED WITH 3kΩ||2500pF.
*SHUTDOWN POLARITY REVERSED FOR MAX213.
SHUTDOWN TRANSMITTERS ON