MAX3387 Maxim, MAX3387 Datasheet - Page 10

• Manufacturer Part Number: MAX3387
• Description: 3V / 15kV ESD-Protected / AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
• Manufacturer: Maxim

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