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參數(shù)資料
| 型號： | MAX3231EEBV-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | DUAL LINE TRANSCEIVER, PBGA30 |
| 封裝： | UCSP-30 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 797K |
| 代理商： | MAX3231EEBV-T |
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 MAX3230E/MAX3231E internal power supply con-
sists of a dual-mode regulated charge pump. For sup-
ply voltages above +3.7V, the charge pump generates
+5.5V at V+ and -5.5V at V-. The charge pumps oper-
ate 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
generates +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 MAX3230E/MAX3231E 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 generates an out-
put voltage of ±5.5V. As the battery discharges, the
MAX3230E/MAX3231E maintain the outputs in regula-
tion until the battery voltage drops below +3.1V. The
output regulation points then change to ±4.0V.
When V
CC
is rising, the charge pump generates an out-
put voltage of ±4.0V, while V
CC
is between +2.5V and
+3.5V. When V
CC
rises above the switchover voltage of
+3.5V, the charge pump switches modes to generate
an output of ±5.5V.
Table 1
shows different supply schemes and their oper-
ating voltage ranges.
RS-232 Transmitters
The transmitters are inverting level translators that
convert CMOS logic levels to RS-232 levels. The
MAX3230E/MAX3231E 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-
Figure 1. V+ Switchover for Changing V
CC
0
6V
4V
0
20ms/div
V
CC
V+
Dual Mode is a trademark of Maxim Integrated Products, Inc.
BUMP
MAX3230E
C6, D6
D1
E1
MAX3231E
C6
D1
E1
NAME
FUNCTION
R_OUT
C1-
GND
Receiver Output(s)
Positive Regulated Charge-Pump Capacitor Negative Terminal
Ground
E2
E2
INVALID
Valid Signal-Detector Output.
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)
—
B6, D6,
E4, E6
N.C.
No Connection. These locations are populated with solder bumps, but are electrically
isolated.
Pin Description (continued)
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| MAX3232CAE | 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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3232CAE+ | 功能描述:RS-232接口集成電路 3-5.5V 235kbps 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: |
| MAX3232CAE+T | 功能描述:RS-232接口集成電路 3-5.5V 235kbps 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: |
| MAX3232CAE-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 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3232CD | 功能描述:RS-232接口集成電路 3-5.5V Multichannel Line Drvr/Rcvr 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: |
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