MAX3381EEUP Maxim Integrated, MAX3381EEUP Datasheet - Page 10

• Manufacturer Part Number: MAX3381EEUP
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3380E, MAX3381Er

Specifications of MAX3381EEUP

• Data Rate: 250 Kbps
• Operating Supply Voltage: 2.35 V to 5.5 V
• Supply Current: 1 mA
• Operating Temperature Range: 0 C to + 70 C
• Function: Transceiver
• Number Of Drivers: 2
• Number Of I/os: 8
• Number Of Receivers: 2
• Propagation Delay Time Ns: 0.15 us
• Shutdown: Yes

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
the host logic supply (+1.65V to +5.5V). The V
will draw a maximum current of 20µA with receiver out-
puts unloaded.
Maxim has developed state-of-the-art structures to pro-
tect these pins against an ESD of ±15kV without dam-
age. The ESD structures withstand high ESD in all states:
normal operation, shutdown, and power-down. After an
ESD event, Maxim’s “E” version devices keep working
without latch-up, whereas competing RS-232 products
can latch and must be powered down to remove latch-
up. ESD protection can be tested in various ways. The
transmitter and receiver outputs and receiver and logic
inputs of this product family are characterized for protec-
tion to the following limits:
•
•
•
Figure 5a. Human Body ESD Test Model
Figure 5b. Human Body Current Waveform
10
AMPERES
±15kV using the Human Body Model
±8kV using the Contact Discharge method speci-
fied in IEC 1000-4-2
±15kV using IEC 1000-4-2’s Air-Gap Discharge
method
______________________________________________________________________________________
VOLTAGE
SOURCE
HIGH-
I
P
DC
36.8%
100%
90%
10%
0
0
CHARGE-CURRENT
LIMIT RESISTOR
t
RL
1MΩ
R
100pF
C
C s
CURRENT WAVEFORM
TIME
STORAGE
CAPACITOR
1500Ω
RESISTANCE
DISCHARGE
±15kV ESD Protection
R
t
DL
D
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
DEVICE
UNDER
TEST
L
input
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
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 inter-
est, which is then discharged into the test device
through a 1.5kΩ resistor.
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to ICs. The MAX3380E/MAX3381E help you
design equipment that meets Level 4, the highest level
of IEC 1000-4-2 without the need for additional ESD-
protection components. The major difference between
tests done using the Human Body Model and IEC
1000-4-2 is higher peak current in IEC 1000-4-2,
because series resistance is lower in the IEC 1000-4-2
model. Hence, the ESD withstand voltages measured
Figure 6a. IEC 1000-4-2 ESD Test Model
Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform
tr = 0.7ns to 1ns
VOLTAGE
SOURCE
HIGH-
DC
100%
CHARGE-CURRENT
90%
10%
LIMIT RESISTOR
I
50MΩ to 100MΩ
R
150pF
C
C s
30ns
STORAGE
CAPACITOR
RESISTANCE
DISCHARGE
330Ω
R
D
ESD Test Conditions
60ns
Human Body Model
IEC 1000-4-2
DEVICE
UNDER
TEST
t