MAX3232ECUP+ Maxim Integrated Products, MAX3232ECUP+ Datasheet - Page 12

• Manufacturer Part Number: MAX3232ECUP+
• Description: IC TXRX RS232 250KBPS LP 20TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3232ECUP+

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Propagation Delay Time Ns: 0.15 us
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 0.3 mA
• Operating Temperature Range: 0 C to + 70 C
• Data Rate: 250 Kbps
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
For the MAX3237E, all logic and RS-232 I/O pins are
characterized for protection to ±15kV per the Human
Body Model.
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 4a shows the Human Body Model, and Figure
4b 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 2. Required Minimum Capacitor
Values
Table 3. Logic-Family Compatibility with
Various Supply Voltages
12
MAX3222E/MAX3232E/MAX3241E
MAX3237E/MAX3246E
POWER-SUPPLY
______________________________________________________________________________________
3.15 to 3.6
VOLTAGE
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
SYSTEM
V
(V)
(V)
3.3
CC
5
5
V
CC
VOLTAGE
SUPPLY
0.047
0.047
(V)
3.3
3.3
(µF)
0.22
0.22
5
0.1
0.1
C1
0.1
ESD Test Conditions
Human Body Model
Compatible with all
CMOS families
Compatible with all
TTL and CMOS
families
C om p ati b l e w i th AC T
and H C T C M OS , and
w i th AC , H C , or
C D 4000 C M O S
COMPATIBILITY
C2, C3, C4
(µF)
0.33
0.47
0.22
0.33
0.1
0.1
1.0
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to integrated circuits. The MAX3222E/
MAX3232E/MAX3237E/MAX3241E/MAX3246E 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 with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 5a shows the IEC 1000-4-2 model, and
Figure 5b shows the current waveform for the ±8kV IEC
1000-4-2 level 4 ESD Contact Discharge test. The Air-
Gap Discharge test involves approaching the device
with a charged probe. The Contact Discharge method
connects the probe to the device before the probe is
energized.
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. All pins require this protection during
manufacturing, not just RS-232 inputs and outputs.
Therefore, after PC board assembly, the Machine
Model is less relevant to I/O ports.
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load
Current Per Transmitter
-1
-2
-3
-4
-5
-6
6
5
4
3
2
1
0
0
V
V
CC
CC
1
LOAD CURRENT PER TRANSMITTER (mA)
= 3.0V
2
3
4
5
V
V
6
OUT+
OUT-
7
Machine Model
8
V
IEC 1000-4-2
V
OUT+
OUT-
9
10