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參數(shù)資料
| 型號(hào)： | MAX3228E-MAX3229E |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 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)： | 6/15頁(yè) |
| 文件大?。?/td> | 227K |
| 代理商： | MAX3228E-MAX3229E |
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M
±15kV ESD-Protected +2.5V to +5.5V
RS-232 Transceivers in UCSP
6
_______________________________________________________________________________________
Detailed Description
Dual-Mode Regulated Charge-Pump
Voltage Converter
The MAX3228E/MAX3229E internal power supply con-
sists of a dual-mode regulated charge pump. For sup-
ply voltages above +3.7V, the charge pump will
generate +5.5V at V+ and -5.5V at V-. The charge
pumps operate in a discontinuous mode. If the output
voltages are less than ±5.5V, the charge pumps are
enabled, if the output voltages exceed ±5.5V, the
charge pumps are disabled.
For supply voltages below +2.85V, the charge pump
will generate +4.0V at V+ and -4.0V at V-. The charge
pumps operate in a discontinuous mode. If the output
voltages are less than ±4.0V, the charge pumps are
enabled, if the output voltages exceed ±4.0V, the
charge pumps are disabled.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supply voltages.
Voltage Generation in the
Switchover Region
The MAX3228E/MAX3229E include a switchover circuit
between these two modes that have approximately
400mV of hysteresis around the switchover point. The
hysteresis is shown in Figure 1. This large hysteresis
eliminates mode changes due to power-supply
bounce.
For example, a three-cell NiMh battery system starts at
V
CC
= +3.6V, and the charge pump will generate an
output voltage of ±5.5V. As the battery discharges, the
PIN
MAX3228E
MAX3229E
NAME
FUNCTION
C5
C5
FORCEOFF
FORCEOFF
Input, Active-Low. Drive
FORCEOFF
low to shut down transmitters,
receivers, and on-board charge pump. This overrides all automatic circuitry and
FORCEON. Pulls itself high internally if not connected.
C6, D6
D1
E1
C6
D1
E1
R_OUT
C1-
GND
Receiver Output(s)
Negative Terminal of Positive Regulated Charge-Pump Capacitor
Ground
E2
E2
INVALID
Output of Valid Signal Detector.
INVALID
is enabled low if no valid RS-232 level is
present on any receiver input.
E3, E4
E5, E6
E3
E5
T_OUT
R_IN
RS-232 Transmitter Output(s)
RS-232 Receiver Input(s)
Pin Description (continued)
SYSTEM SUPPLY (V)
1 Li+ Cell
3 NiCad/NiMh Cells
Regulated Voltage Only
(V
CC
falling)
Regulated Voltage Only
(V
CC
falling)
V
CC
(V)
+2.4 to +4.2
+2.4 to +3.8
V
L
(V)
RS-232 MODE
Compliant/Compatible
Compliant/Compatible
Regulated System Voltage
Regulated System Voltage
+3.0 to +5.5
+3.0 to +5.5
Compliant
+2.5 to +3.0
+2.5 to +3.0
Compatible
Table 1. Operating Supply Options
Figure 1. V+ Switchover for Changing V
CC
0
6V
4V
0
20ms/div
V
CC
V+
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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX3229EBV-T | 功能描述:RS-232接口集成電路 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3229EEBV | 制造商:Maxim Integrated Products 功能描述::15KV ESD, +2.5V TO +5.5V 1TX/1RX RS-232 TRA - Rail/Tube |
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