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參數(shù)資料
| 型號(hào)： | MAX3228-MAX3229 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.5V to +5.5V RS-232 Transceivers in UCSP |
| 中文描述： | 2.5V至5.5V的RS - 232收發(fā)器的UCSP封裝 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大?。?/td> | 238K |
| 代理商： | MAX3228-MAX3229 |
M
+2.5V to +5.5V RS-232 Transceivers
in UCSP
6
_______________________________________________________________________________________
Detailed Description
Dual-Mode Regulated Charge-Pump
Voltage Converter
The MAX3228/MAX3229 internal power supply consists
of a dual-mode regulated charge pump. For supply
voltages above +3.7V, the charge pump will generate
+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
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 MAX3228/MAX3229 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.
PIN
MAX3228
MAX3229
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
20ms/div
6V
4V
V+
V
CC
0
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| 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 |
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| 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: |
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