MAX203 MAXIM [Maxim Integrated Products], MAX203 Datasheet - Page 7

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

Figure 5. Transmitter Outputs When Exiting Shutdown
In shutdown mode, the MAX200/MAX205/MAX206/
MAX211/MAX213 charge pumps are turned off, V+ is
pulled down to V
transmitter outputs are disabled. This reduces supply
Table 1a. MAX200 Control Pin Configurations
Table 1b. MAX205/MAX206/MAX211 Control Pin Configurations
Table 1c. MAX213 Control Pin Configurations
*Active = active with reduced performance.
SHDN
SHDN
SHDN
0
0
1
1
THREE TRANSMITTERS LOADED WITH 3kI||2500pF.
*SHUTDOWN POLARITY REVERSED FOR MAX213.
0
0
1
0
1
SHUTDOWN
EN
0
1
0
1
EN
0
1
0
Shutdown and Enable Control
CC
, V- is pulled to ground, and the
OPERATION STATUS
TRANSMITTERS ON
Normal Operation
Normal Operation
Shutdown
Shutdown
OPERATION STATUS
OPERATION STATUS
Normal Operation
Normal Operation
Normal Operation
Shutdown
Shutdown
TWO TRANSMITTER
OUTPUTS:
ONE HIGH, ONE LOW
SHDN*
with 0.1µF External Capacitors
TRANSMITTERS T1–T4
All High-Z
All High-Z
All Active
All Active
+5V, RS-232 Transceivers
TRANSMITTERS T1–T5
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
connected directly to a three-state bus. It has no effect
on the RS-232 drivers or on the charge pumps.
During normal operation, the MAX213’s receiver propa-
gation delay is typically 1Fs. When entering shutdown
with receivers active, R4 and R5 are not valid until 80Fs
after SHDN is driven low. In shutdown mode, propaga-
tion delays increase to 4Fs 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 0.1FF capacitors).
MAX213 Receiver Operation in Shutdown
All High-Z
All Active
All Active
R1, R2, R3
High-Z
High-Z
High-Z
Active
TRANSMITTERS T1–T5
All High-Z
All Active
RECEIVERS
RECEIVERS R1–R5
All High-Z
All High-Z
All Active
R4, R5
High-Z
Active*
High-Z
Active
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