MAX13223EEUP+T Maxim Integrated Products, MAX13223EEUP+T Datasheet - Page 10

• Manufacturer Part Number: MAX13223EEUP+T
• Description: IC TXRX RS-232 2TX/2RX 20-TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX13223EEUP+T

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
The MAX13223E is designed to survive faults such as
direct shorts to power supplies, miswiring faults, con-
nector failures, and tool misapplications of the transmit-
ter outputs and receiver inputs to voltages in the ±70V
range without damage. This fault protection is applica-
ble in all modes of the MAX13223E: active, shutdown,
and powered down. Both receivers operate over the
±70V input range, but the termination resistor (R
increases when |V
A receiver’s input termination resistor reduces to its
nominal value if the input voltage reduces to within the
±24V range. The receiver inputs and transmitter out-
puts are independently fault protected.
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. In using the MAX13223E, C4 must be a 1µF
capacitor for the extended ESD protection. The driver
outputs and receiver inputs of the MAX13223E have
extra protection against static electricity. Maxim’s engi-
neers have developed state-of-the-art structures to pro-
tect these pins against ESD of ±8kV 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 transmit-
ter outputs and receiver inputs of this product family are
characterized for protection to the following limits:
1) ±8kV using the Human Body Model
2) ±8kV using the Contact-Discharge Method speci-
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 8a shows the Human Body Model and Figure 8b
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.
10
fied in IEC 61000-4-2
______________________________________________________________________________________
R_IN
| voltage exceeds ±32V.
±8kV ESD Protection
ESD Test Conditions
Human Body Model
Fault Protection
RX,I
)
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specifi-
cally refer to integrated circuits. The major difference
between tests done using the Human Body Model and
IEC 61000-4-2 is higher peak current in IEC 61000-4-2,
because series resistance is lower in the IEC 61000-4-2
model. Hence, the ESD withstand voltage measured to
IEC 61000-4-2 is generally lower than that measured
using the Human Body Model. Figure 9a shows the IEC
61000-4-2 model and Figure 9b shows the current
waveform for the ±8kV, IEC 61000-4-2, level 4, ESD
Contact-Discharge Method.
Figure 8a. Human Body ESD Test Model
Figure 8b. Human Body Current Waveform
AMPERES
VOLTAGE
SOURCE
HIGH-
DC
I
P
36.8%
100%
90%
10%
CHARGE-CURRENT
LIMIT RESISTOR
0
0
1MΩ
t
R
RL
100pF
C
C s
STORAGE
CAPACITOR
CURRENT WAVEFORM
TIME
RESISTANCE
DISCHARGE
1500Ω
R
D
t
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
IEC 61000-4-2
DEVICE
UNDER
TEST