MAX202E–MAX213E, MAX232E/MAX241E
±±15kV ESD-Potected,V+1kVRED232VTPansceivePsV
The MAX213E’s receiver propagation delay is typically
0.5ꢄs in normal operation. In shutdown mode,
propagation delay increases to 4ꢄs ꢁor both rising and
ꢁalling transitions. The MAX213E’s receiver inputs have
approximately 0.5V hysteresis, except in shutdown,
when receivers R4 and R5 have no hysteresis.
MAX211E
3V
0V
SHDN
V+
10V
5V
When entering shutdown with receivers active, R4 and
R5 are not valid until 80ꢄs aꢁter SHDN is driven low.
When coming out oꢁ shutdown, all receiver outputs are
invalid until the charge pumps reach nominal voltage
levels (less than 2ms when using 0.1ꢄµ capacitors).
0V
V-
-5V
-10V
±±15kV ESV-Potection
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-oꢁ-the-art structures to
protect these pins against ESD oꢁ 15kV without
damage. The ESD structures withstand high ESD in all
states: normal operation, shutdown, and powered
down. Aꢁter 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.
200μs/div
µigure 5. MAX211E V+ and V- when Exiting Shutdown (0.1ꢄµ
capacitors)
Table 1a. MAX205E/MAX206E/MAX211E/
MAX241E Control Pin Configurations
OPERATION
SHDN EN
Tx
Rx
All Active
All High-Z
All High-Z
STATUS
ESD protection can be tested in various waysꢂ the
transmitter outputs and receiver inputs oꢁ this product
ꢁamily are characterized ꢁor protection to the ꢁollowing
limits:
Normal
Operation
0
0
1
0
1
X
All Active
All Active
All High-Z
Normal
Operation
1) 15kV using the Human Body Model
Shutdown
2) 8kV using the contact-discharge method speciꢁied
in IEC1000-4-2
X = Don't care.
3) 15kV using IEC1000-4-2’s air-gap method.
Table 1b. MAX213E Control Pin
Configurations
ESD Test Conditions
ESD perꢁormance depends on a variety oꢁ conditions.
Contact Maxim ꢁor a reliability report that documents
test set-up, test methodology, and test results.
Rx
OPERATION
SHDN EN
Tx 1–4
STATUS
Shutdown
Shutdown
1–3
4, 5
Human Body Model
µigure 6a shows the Human Body Model, and µigure
6b shows the current waveꢁorm it generates when
discharged into a low impedance. This model consists
oꢁ a 100pµ capacitor charged to the ESD voltage oꢁ
interest, which is then discharged into the test device
through a 1.5kΩ resistor.
0
0
1
1
0
1
0
1
All High-Z
All High-Z
All Active
All Active
High-Z
High-Z
High-Z
High-Z
Active
Active*
High-Z
Active
Normal
Operation
Normal
Operation
*Active = active with reduced perꢁormance
Maxim Integrated
11
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