Datasheet

MAX3387E
3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
10 ______________________________________________________________________________________
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 5a shows the Human Body Model, and Figure
5b 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.
Table 1. Output Control Truth Table
OPERATION STATUS FORCEON
FORCEOFF
VALID
RECEIVER
LEVEL
RECEIVER OR
TRANSMITTER
EDGE WITHIN
30
T_OUT R_OUT
Shutdown
(Forced Off)
X 0 X X High-Z Active
Normal Operation
(Forced On)
1 1 X X Active Active
Normal Operation
(AutoShutdown Plus)
0 1 X Yes Active Active
Shutdown
(AutoShutdown Plus)
0 1 X No High-Z Active
Normal Operation
INVALID
1 Yes X Active Active
Normal Operation
INVALID
1 X Yes Active Active
Shutdown
INVALID
1 No No High-Z Active
Normal Operation
(AutoShutdown)
INVALID INVALID
Yes X Active Active
Shutdown
(AutoShutdown)
INVALID INVALID
No X High-Z Active
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
100pF
R
C
1M
R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 5a. Human Body ESD Test Model
I
P
100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 5b. Human Body Current Waveform
X = Don’t care