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參數(shù)資料
| 型號： | MAX3218CAP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| 中文描述： | LINE TRANSCEIVER, PDSO20 |
| 封裝： | SSOP-20 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | MAX3218CAP |
_______________Detailed Desc ription
The MAX3218 line driver/receiver is intended for bat-
tery-powered EIA/TIA-232 and V.28/V.24 communica-
tions interfaces that require two drivers and two
receivers. The operating voltage extends from 1.8V to
4.25V, yet the device maintains true RS-232 and
EIA/TIA-562 transmitter output voltage levels. This wide
supply voltage range permits direct operation from a
variety of batteries without the need for a voltage regu-
lator. For example, the MAX3218 can be run directly
from a single lithium cell or a pair of alkaline cells. It
can also be run directly from two NiCd or NiMH cells
from full-charge voltage down to the normal 0.9V/cell
end-of-life point. The 4.25V maximum supply voltage
allows the two rechargeable cells to be trickle- or fast-
charged while driving the MAX3218.
The circuit comprises three sections: power supply,
transmitters, and receivers. The power-supply section
converts the supplied input voltage to 6.5V, providing the
voltages necessary for the drivers to meet true RS-232
levels. External components are small and inexpensive.
The transmitters and receivers are guaranteed to oper-
ate at 120kbps data rates, providing compatibility with
LapLink and other high-speed communications soft-
ware.
The MAX3218 is equipped with Maxim’s new propri-
etary AutoShutdown circuitry. This achieves a 1μA
supply current by shutting down the device when the
RS-232 cable is disconnected or when the connected
peripheral transmitters are turned off. While shut down,
both receivers can remain active or can be disabled
under logic control. With this feature, the MAX3218 can
be in low-power shutdown mode and still monitor activi-
ty on external devices. Three-state drivers are provid-
ed on both receiver outputs.
Three-state drivers on both receiver outputs are provid-
ed so that multiple receivers, generally of different inter-
face standards, can be wire-ORed at the UART.
S witc h-Mode Power S upply
The switch-mode power supply uses a single inductor
with one diode and three small capacitors to generate
±6.5V from an input voltage in the 1.8V to 4.25V range.
Inductor Selection
Use a 15μH inductor with a saturation current rating of at
least 350mA and less than 1
resistance. Table 1 lists
suppliers of inductors that meet the 15μH/350mA/1
specifications.
M
1μA S upply Current, 1.8V to 4.25V-Powered
RS -232 Transc eiver with AutoS hutdown
_______________________________________________________________________________________
5
Receiver Inputs
R2IN, R1IN
11, 12
Transmitter Outputs, swing between V+ and V-
T2OUT, T1OUT
13, 14
Negative Supply generated on-board
V-
15
Terminal for Charge-Pump Capacitor
C1-, C1+
16, 18
Positive Supply generated on-board
V+
19
Ground
GND
5, 17, 20
Supply Voltage Input, 1.8V to 4.25V. Bypass to GND with at least 1μF.
V
CC
6
Transmitter Inputs
T1IN, T2IN
7, 8
Receiver Outputs
R1OUT, R2OUT
9, 10
Drive low to shut down transmitters and on-board power supply, overriding all automatic
circuitry and FORCEON.
FORCEOFF
4
Drive high when FORCEOFF = high to override automatic circuitry, keeping transmitters on.
FORCEON
3
PIN
Output of Invalid Signal Detector. Low if invalid RS-232 levels are present on all receiver inputs,
otherwise high.
INVALID
2
Inductor/Diode Connection Point
LX
1
FUNCTION
NAME
______________________________________________________________Pin Desc ription
LapLink is a trademark of Traveling Software, Inc.
AutoShutdown is a trademark of Maxim Integrated Products.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3218 | 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown(1.8~4.25V,自動關(guān)閉方式，120kbps，RS-232收發(fā)器) |
| MAX3218CPP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| MAX3218EAP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| MAX3218EPP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| MAX3218* | 1µ.A.1.8V to 4.25V RS-232 Transceiver with AutoShutdown™. |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3218CAP+ | 功能描述:RS-232接口集成電路 1uA 1.8-4.25V Tcvr w/AutoShutdown 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: |
| MAX3218CAP+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| MAX3218CAP+T | 功能描述:RS-232接口集成電路 1uA 1.8-4.25V Tcvr w/AutoShutdown 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: |
| MAX3218CAP-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: |
| MAX3218CPP | 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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