參數(shù)資料
型號： MAX3228EEBV
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： 【15kV ESD-Protected @.5V to %.5V RS-232 Transceivers in UCSP
中文描述： DUAL LINE TRANSCEIVER, PBGA30
封裝： UCSP-30
文件頁數(shù)： 7/15頁
文件大?。?/td> 251K
代理商： MAX3228EEBV
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
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
MAX324 Precision, Single-Supply, SPST Analog Switches(接通電阻60Ω,漏電流0.1nA,導(dǎo)通速率150ns單電源,單刀單擲模擬開關(guān))
MAX325 Precision, Single-Supply, SPST Analog Switches(接通電阻60Ω,漏電流0.1nA,導(dǎo)通速率150ns，單電源,單刀單擲，模擬開關(guān))
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3228EEBV+ 制造商:Maxim Integrated Products 功能描述:?15KV ESD-PROTECTED +2.5V TO +5.5V RS-232 TRANSCEIVERS IN UC - Rail/Tube
MAX3228EEBV-T 功能描述:RS-232接口集成電路 2.5-5.5V Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
MAX3229AEEWV+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX3229AEEWV+T 制造商:Maxim Integrated Products 功能描述:+2.5V TO +5.5V RS-232 TRANSCEIVERS - Tape and Reel
MAX3229EBV 制造商:Maxim Integrated Products 功能描述:+2.5V TO +5.5V RS-232 TRANSCEIVERS IN UCSP (E - Rail/Tube
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*