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參數(shù)資料
| 型號： | MAX3320_EAP |
| 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 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 128K |
| 代理商： | MAX3320_EAP |
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_______________________________________________________________________________________
______________ Detailed Desc ription
Dual Charge-Pump V oltage Converter
The MAX3320
’
s internal power supply consists of a reg-
ulated dual charge pump that provides output voltages
of +5.5V (doubling charge pump) and -5.5V (inverting
charge pump) while V
CC
remains in the 3V to 5.5V
range. The charge pumps operate in discontinuous
mode; they are enabled if the output voltages are less
than 5.5V, and disabled if output voltages exceed 5.5V.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
RS -232 T ransmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5V EIA/TIA-232 levels. The
MAX3320 transmitters guarantee a 250kbps data rate
with worst-case loads of 3k
in parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink). Transmitters can be par-
alleled to drive multiple receivers. Figure 1 shows a
complete system connection.
When
FORCEOFF
is driven to ground, the transmitter
’
s
outputs become high impedance. When the
AutoShutdown Plus circuitry senses that all receiver
and transmitter inputs are inactive for more than 30sec,
the transmitters turn off and the outputs go into a high-
impedance state, but the receivers remain active.
When the power is off or the MAX3320 is shut down,
outputs may be driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or V
CC
.
Laplink is a trademark of Traveling Software.
RS -232 Rec eivers
The receivers convert RS-232 signals to CMOS-logic out-
put levels. All receivers have inverting outputs and are
active in shutdown
FORCEOFF
(Table 1).
AutoS hutdown Plus Mode
Maxim’s AutoShutdown Plus feature, which operates
when
FORCEOFF
is high and FORCEON is low, achieves
a 4μA supply current. When the MAX3320 senses no
valid signal levels on all receiver and transmitter inputs for
30sec, the on-board power supply and drivers shut off,
MAX3320
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
T1
T2
R1
R2
Figure 1. Interface Under Control of PMU
Table 1. MAX3320 Output Control Truth Table
FORCEOFF
0
High-Z
T_OUT
Active
R_OUT
1
Active
Active
Normal operation
(forced on)
X
1
1
Active
Active
Normal operation
(AutoShutdown Plus)
<30sec*
0
1
High-Z
Active
Shutdown
(AutoShutdown Plus)
>30sec*
0
FORCEON
Shutdown
(forced off)
X
X
OPERATION
STATUS
AUTOSHUTDOWN
PLUS*
X = Don’t Care
*Time since last receiver or transmitter input activity
3V to 5.5V, up to 250kbps True RS-232 Transceiver
with 4μA AutoShutdown Plus and Power-On Reset
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3320LCAP | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據速率: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: |
| MAX3320LCAP+T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據速率: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: |
| MAX3320LCAP-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據速率: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: |
| MAX3320LEAP | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據速率: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: |
| MAX3320LEAP-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據速率: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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