參數(shù)資料
型號(hào)： MAX3228E-MAX3229E
廠商： Maxim Integrated Products, Inc.
元件分類(lèi)： RS-232
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： 5V的高速RS - 232收發(fā)器與0.1uF電容
文件頁(yè)數(shù)： 7/15頁(yè)
文件大?。?/td> 227K
代理商： MAX3228E-MAX3229E
M
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
_______________________________________________________________________________________
7
MAX3228E/MAX3229E maintain the outputs in regula-
tion until the battery voltage drops below +3.1V. Then
the output regulation points change to ±4.0V
When V
CC
is rising, the charge pump will generate an
output voltage of ±4.0V, while V
CC
is between +2.5V
and +3.5V. When V
CC
rises above the switchover volt-
age of +3.5V, the charge pump switches modes to
generate an output of ±5.5V.
Table 1 shows different supply schemes and their
operating voltage ranges.
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to RS-232 levels. The
MAX3228E/MAX3229E will automatically reduce the
RS-232 compliant levels (±5.5V) to RS-232 compatible
levels (±4.0V) when V
CC
falls below approximately
+3.1V. The reduced levels also reduce supply current
requirements, extending battery life. Built-in hysteresis
of approximately 400mV for V
CC
ensures that the RS-
232 output levels do not change if V
CC
is noisy or has a
sudden current draw causing the supply voltage to
drop slightly. The outputs will return to RS-232 compli-
ant levels (±5.5V) when V
CC
rises above approximately
+3.5V.
The MAX3228E/MAX3229E transmitters guarantee a
250kbps data rate with worst-case loads of 3k
in par-
allel with 1000pF.
When
FORCEOFF
is driven to ground, the transmitters
and receivers are disabled and the outputs become
high impedance. When the AutoShutdown circuitry
senses that all receiver and transmitter inputs are inac-
tive for more than 30μs, the transmitters are disabled
and the outputs go to a high-impedance state. When
the power is off, the MAX3228E/MAX3229E permit the
transmitter outputs to be driven up to ±12V.
The transmitter inputs do not have pullup resistors.
Connect unused inputs to GND or V
L
.
RS-232 Receivers
The MAX3228E/MAX3229E receivers convert RS-232
signals to logic output levels. All receivers have invert-
ing three-state outputs and can be active or inactive. In
shutdown (
FORCEOFF
= low) or in AutoShutdown, the
MAX3228E/MAX3229E receivers are in a high-imped-
ance state (Table 3).
The MAX3228E/MAX3229E feature an
INVALID
output
that is enabled low when no valid RS-232 signal levels
have been detected on any receiver inputs.
INVALID
is
functional in any mode (Figures 2 and 3).
Figure 2c. MAX322_E AutoShutdown Logic
FORCEOFF
POWER DOWN
INVALID
FORCEON
INVALID IS AN INTERNALLY GENERATED SIGNAL
THAT IS USED BY THE AUTOSHUTDOWN LOGIC
AND APPEARS AS AN OUTPUT OF THE DEVICE.
POWER DOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
V
L
V
L
V
CC
Figure 2a. MAX322_E Entering 1μA Supply Mode via
AutoShutdown
+0.3V
-0.3V
INVALID
TO MAX322 _E
POWER SUPPLY
AND TRANSMITTERS
R_IN
*TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1
μ
A IF
ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST
30
μ
s.
30
μ
s
COUNTER
R
Figure 2b. MAX322_E with Transmitters Enabled Using
AutoShutdown
+2.7V
-2.7V
INVALID
TO MAX322 _E
POWER SUPPLY
R_IN
*TRANSMITTERS ARE ENABLED IF:
ANY RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V.
ANY RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR
LESS THAN
30
μ
s.
30
μ
s
COUNTER
R
相關(guān)PDF資料
PDF描述
MAX3228E 【15kV ESD-Protected @.5V to %.5V RS-232 Transceivers in UCSP
MAX3228EEBV 【15kV ESD-Protected @.5V to %.5V RS-232 Transceivers in UCSP
MAX3232 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1μF External Capacitors(3V~5.5V,關(guān)閉方式下接收器有效,120kbps，RS-232收發(fā)器)
MAX3237 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1μF External Capacitors(3V~5.5V,關(guān)閉方式下接收器有效,120kbps，RS-232收發(fā)器)
MAX323 Precision, Single-Supply, SPST Analog Switches
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