MAX3235EEPP Maxim Integrated Products, MAX3235EEPP Datasheet - Page 10

IC TXRX RS232 DUAL 250KBPS 20DIP

MAX3235EEPP

Manufacturer Part Number
MAX3235EEPP
Description
IC TXRX RS232 DUAL 250KBPS 20DIP
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet

Specifications of MAX3235EEPP

Number Of Drivers/receivers
2/2
Protocol
RS232
Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Through Hole
Package / Case
20-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors
that measured using the Human Body Model. Figure 6a
shows the IEC 1000-4-2 model, and Figure 6b shows the
current waveform for the ±8kV, IEC 1000-4-2, Level 4,
ESD contact-discharge test.
The air-gap 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
Figure 7. Transmitter Outputs when Exiting Shutdown or
Powering Up
10
Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform
10V/div
t r = 0.7ns to 1ns
5V/div
2V/div
______________________________________________________________________________________
0
0
0
100%
V
90%
10%
FORCEON = FORCEOFF
CC
I
= 3.3V
30ns
10µs/div
60ns
Machine Model
T1OUT
T2OUT
t
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and
outputs. Therefore, after PC board assembly, the
Machine Model is less relevant to I/O ports.
The MAX3233E/MAX3235E do not require external
capacitors to operate their internal charge pumps.
The MAX3235E can be operated down to 3.0V by par-
alleling the internal C1 capacitor with an external 0.1µF.
When using an external capacitor across the C1 termi-
nals, check to confirm that the total supply voltage
measured from V+ to V- does not exceed the absolute
maximum voltage of 13V. With the external 0.1µF
capacitor added, the MAX3235E should not be used
with a supply greater than +3.9V.
In most applications, a 0.1µF V
adequate. Connect bypass capacitors as close to the
IC as possible.
Figure 7 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232
levels (one transmitter input is high, the other is low).
Figure 8. Loopback Test Circuit
__________Applications Information
V
V
CC
CC
C
BYPASS
FORCEOFF
T_ IN
R_ OUT
FORCEON
MAX3233E
MAX3235E
Power-Supply Decoupling
GND
V
CC
when Exiting Shutdown
Transmitter Outputs
T_ OUT
5kΩ
CC
R_ IN
bypass capacitor is
Charge Pumps
1000pF

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