IC TXRX RS232 DUAL 250KBPS 20DIP

MAX3235EEPP

Manufacturer Part NumberMAX3235EEPP
DescriptionIC TXRX RS232 DUAL 250KBPS 20DIP
ManufacturerMaxim Integrated Products
TypeTransceiver
MAX3235EEPP datasheet
 

Specifications of MAX3235EEPP

Number Of Drivers/receivers2/2ProtocolRS232
Voltage - Supply4.5 V ~ 5.5 VMounting TypeThrough Hole
Package / Case20-DIP (0.300", 7.62mm)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
RS-232 Transceivers with Internal Capacitors
I
100%
90%
10%
t r = 0.7ns to 1ns
30ns
60ns
Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform
5V/div
0
FORCEON = FORCEOFF
2V/div
0
V
= 3.3V
CC
10V/div
0
10µs/div
Figure 7. Transmitter Outputs when Exiting Shutdown or
Powering Up
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
10
______________________________________________________________________________________
V
CC
C
BYPASS
T_ IN
R_ OUT
t
FORCEON
V
FORCEOFF
CC
Figure 8. Loopback Test Circuit
manufacturing. Of course, all pins require this protec-
T1OUT
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.
__________Applications Information
The MAX3233E/MAX3235E do not require external
capacitors to operate their internal charge pumps.
T2OUT
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.
Machine Model
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).
V
CC
MAX3233E
MAX3235E
T_ OUT
R_ IN
5kΩ
1000pF
GND
Charge Pumps
Power-Supply Decoupling
bypass capacitor is
CC
Transmitter Outputs
when Exiting Shutdown