±15kV ESD-Protected, +5V RS-232 Transceivers
The MAX213E’s receiver propagation delay is typically
0.5µs in normal operation. In shutdown mode,
propagation delay increases to 4µs for both rising and
falling transitions. The MAX213E’s receiver inputs have
approximately 0.5V hysteresis, except in shutdown,
when receivers 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).
MAX202E–MAX213E, MAX232E/MAX241E
MAX211E
3V
0V
10V
5V
0V
-5V
-10V
V-
V+
SHDN
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against
electrostatic discharges encountered during handling
and assembly. 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
transmitter 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
discharged 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.
200µs/div
Figure 5. MAX211E V+ and V- when Exiting Shutdown (0.1µF
capacitors)
Table 1a. MAX205E/MAX206E/MAX211E/
MAX241E Control Pin Configurations
SHDN
EN
0
0
1
0
1
X
OPERATION
STATUS
Normal
Operation
Normal
Operation
Shutdown
Tx
All Active
All Active
All High-Z
Rx
All Active
All High-Z
All High-Z
X = Don't care.
Table 1b. MAX213E Control Pin
Configurations
SHDN
EN
OPERATION
STATUS
Shutdown
Shutdown
Normal
Operation
Normal
Operation
Rx
Tx 1–4
1–3
All High-Z
All High-Z
All Active
All Active
High-Z
High-Z
High-Z
Active
4, 5
High-Z
Active*
High-Z
Active
0
0
1
1
0
1
0
1
*Active
= active with reduced performance
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