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參數(shù)資料
| 型號(hào)： | MAX3228E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 【15kV ESD-Protected @.5V to %.5V RS-232 Transceivers in UCSP |
| 中文描述： | ±15kV ESD保護(hù)、+2.5V至+5.5V、RS-232收發(fā)器，UCSP和WLP封裝 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 251K |
| 代理商： | MAX3228E |
M
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
_______________________________________________________________________________________
9
MAX3228E/MAX3229E feature a separate logic supply
input (V
L
) that sets V
OH
for the receiver and
INVALID
outputs. The transmitter inputs (T_IN), FORCEON and
FORCEOFF
, are also referred to V
L
. This feature allows
maximum flexibility in interfacing to different systems
and logic levels. Connect V
L
to the system
’
s logic sup-
ply voltage (+1.65V to +5.5V), and bypass it with a
0.1μF capacitor to GND. If the logic supply is the same
as V
CC
, connect V
L
to V
CC
. Always enable V
CC
before
enabling the V
L
supply. V
CC
must be greater than or
equal to the V
L
supply.
Software-Controlled Shutdown
If direct software control is desired, connect
FORCE-
OFF
and FORCEON together to disable AutoShutdown.
The microcontroller then drives
FORCEOFF
and
FORCEON like a
SHDN
input,
INVALID
can be used to
alert the microcontroller to indicate serial data activity.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The driver outputs and receiver inputs of the
MAX3228E/MAX3229E have extra protection against
static electricity. Maxim
’
s engineers have developed
state-of-the-art structures to protect these pins against
ESD of ±15kV without damage. The ESD structures with-
stand high ESD in all states: normal operation, shut-
down, and powered down. After an ESD event Maxim
’
s
E versions keep working without latchup, whereas com-
peting RS-232 products can latch and must be powered
down to remove latchup.
ESD protection can be tested in various ways; the trans-
mitter 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
in IEC 1000-4-2.
3) ±15kV using the IEC 1000-4-2 Air-Gap method.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model
Figure 5a shows the Human Body Model, and Figure 5b
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
1.5k
resistor.
Table 3. Output Control Truth Table
TRANSCEIVER STATUS
Shutdown (AutoShutdown)
Shutdown (Forced Off)
Normal Operation (Forced On)
Normal Operation (AutoShutdown)
FORCEON
Low
X
High
Low
FORCEOFF
High
Low
High
High
RECEIVER STATUS
High-Z
High-Z
Active
Active
INVALID
L
H
X = Don’t care.
= I
NVALID
output state is determined by R_IN input levels.
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
R
C
1M
R
D
1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 5a. Human Body ESD Test Models
I
P
100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPERES
Figure 5b. Human Body Model Current Waveform
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| MAX3228EBV | 制造商:Maxim Integrated Products 功能描述:+2.5V TO +5.5V RS-232 TRANSCEIVERS - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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| MAX3228EEBV | 制造商:Maxim Integrated Products 功能描述::15KV ESD, +2.5V TO +5.5V 2TX/2RX RS-232 TRA - Bulk 制造商:Rochester Electronics LLC 功能描述: |
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