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| 型号： | MAX3218EAP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRS RS-232 W/SHTDWN 20SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 线路收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 1.8 V ~ 4.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
_______________Detailed Description
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 1A
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.
Switch-Mode Power Supply
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 15H inductor with a saturation current rating of at
least 350mA and less than 1
resistance. Table 1 lists
suppliers of inductors that meet the 15 H/350mA/1
specifications.
MAX3218
1A Supply Current, 1.8V to 4.25V-Powered
RS-232 Transceiver with AutoShutdown
_______________________________________________________________________________________
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 1F.
VCC
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 Description
LapLink is a trademark of Traveling Software, Inc.
AutoShutdown is a trademark of Maxim Integrated Products.
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