Datasheet

high for the MAX205E/MAX206E/MAX211E/MAX241E
(SHDN), but is active low for the MAX213E (SHDN).
The MAX213E’s receiver propagation delay is typically
0.5μs in normal operation. In shutdown mode, propaga-
tion delay increases to 4μs for both rising and falling
transitions. The MAX213E’s receiver inputs have approxi-
mately 0.5V hysteresis, except in shutdown, when receiv-
ers R4 and R5 have no hysteresis.
When entering shutdown with receivers active, R4 and R5
are not valid until 80μs after SHDN is driven low. When
coming out of shutdown, all receiver outputs are invalid
until the charge pumps reach nominal voltage levels (less
than 2ms when using 0.1μF capacitors).
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electro-static
discharges encountered during handling and assem-
bly. The driver outputs and receiver inputs have extra
protection against static electricity. Maxim’s engineers
developed state-of-the-art structures to protect these
pins against ESD of ±15kV without damage. The ESD
structures withstand high ESD in all states: normal
operation, shutdown, and powered down. After an ESD
event, Maxim’s E versions keep working without latchup,
whereas competing RS-232 products can latch and must
be powered down to remove latchup.
ESD protection can be tested in various ways; the trans-
mitter outputs and receiver inputs of this product family
are characterized for protection to the following limits:
1) ±15kV using the Human Body Model
2) ±8kV using the contact-discharge method specified in
IEC1000-4-2
3) ±15kV using IEC1000-4-2’s air-gap method.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
set-up, test methodology, and test results.
Human Body Model
Figure 6a shows the Human Body Model, and Figure
6b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
X = Don’t care.
*Active = active with reduced performance
Table 1a. MAX205E/MAX206E/MAX211E/
MAX241E Control Pin Configurations
Table 1b. MAX213E Control Pin
Configurations
Figure 5. MAX211E V+ and V- when Exiting Shutdown (0.1μF
capacitors)
SHDN EN
OPERATION
STATUS
Tx Rx
0 0
Normal
Operation
All Active All Active
0 1
Normal
Operation
All Active All High-Z
1 X Shutdown All High-Z All High-Z
SHDN EN
OPERATION
STATUS
Tx 1–4
Rx
1–3 4, 5
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
www.analog.com
Analog Devices │ 11
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
V+
V-
200µs/div
3V
0V
10V
5V
0V
-5V
-10V
SHDN
MAX211E