MAX3244ECWI+ Maxim Integrated Products, MAX3244ECWI+ Datasheet - Page 13

• Manufacturer Part Number: MAX3244ECWI+
• Description: IC TXRX RS232 250KBPS SD 28-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3244ECWI+

• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Propagation Delay Time Ns: 0.15 us
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 1 uA
• Operating Temperature Range: 0 C to + 70 C
• Data Rate: 250 Kbps
• Mounting Style: SMD/SMT
• Number Of I/os: 3 / 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

these pins against ESD of ±15kV 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
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:
1) ±15kV using the Human Body Model
2) ±8kV using the Contact-Discharge Method specified
3) ±15kV using IEC 1000-4-2’s Air-Gap Method.
Figure 6a. Human Body ESD Test Model
Figure 6b. Human Body Current Waveform
±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,
AMPERES
in IEC 1000-4-2
VOLTAGE
SOURCE
HIGH-
DC
RS-232 Transceivers with AutoShutdown Plus
I
P
36.8%
100%
90%
10%
CHARGE-CURRENT
0
LIMIT RESISTOR
0
R
t
C
RL
1MΩ
100pF
______________________________________________________________________________________
C s
STORAGE
CAPACITOR
CURRENT WAVEFORM
R
TIME
RESISTANCE
D
DISCHARGE
1500Ω
t
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
DEVICE
UNDER
TEST
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 6a shows the Human Body Model and Figure 6b
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.
Figure 7a. IEC 1000-4-2 ESD Test Model
Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform
t r = 0.7ns to 1ns
VOLTAGE
SOURCE
HIGH-
DC
CHARGE CURRENT
100%
R
LIMIT RESISTOR
90%
10%
C
50MΩ to 100MΩ
I
150pF
C s
30ns
STORAGE
CAPACITOR
R
RESISTANCE
DISCHARGE
D
330Ω
60ns
ESD Test Conditions
Human Body Model
DEVICE
UNDER
TEST
t
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