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| 型号： | MAX3212EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX 3DRVR 5RX 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/5 |
| 规程： | RS232 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
_______________Detailed Description
The MAX3212 line driver/receiver is intended for 3V-
powered EIA/TIA-232E and V.28/V.24 communications
interfaces where 3 drivers and 5 receivers are required.
The operating voltage range extends from 3.6V down to
2.7V while still maintaining true RS-232 and EIA/TIA-562
transmitter output voltage levels.
The circuit comprises three sections: power supply,
transmitters, and receivers. The power-supply section
converts the supplied 3V to about ±6.5V, to provide
the voltages necessary for the drivers to meet true RS-
232 levels. External components are small and inex -
pensive.
The transmitters and receivers are guaranteed to oper-
ate at data rates of 235kbps.
The MAX3212 is equipped with Maxim’s new propri -
etary AutoShutdown circuitry. This achieves a supply
current of 1 A by shutting down the device when the
RS-232 cable is disconnected or when the connected
peripheral transmitters are turned off. While shut down,
all receivers can remain active or can be disabled
under logic control. A complementary receiver remains
active in all cases, enabling a system incorporating the
MAX3212 to remain shut down and still monitor incom-
ing RS-232 activity.
Three-state drivers on all receiver outputs are provided
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 two inexpensive diodes and two capacitors to
generate ±6.5V from the 2.7V to 3.6V input. The
Typical
Operating Circuit shows the complete circuit for the pow-
er supply.
Use a 15
H inductor with a saturation current rating of at
least 350mA and under 1
resistance. Use 1N6050
diodes or equivalent. Surface-mount equivalents for the
1N6050 include the Motorola MMBD6050LT1, P hilips
PMBD6050, and Allegro (formerly Sprague) TMPD6050LT.
For C1 and C2, use ceramic capacitors with values no
less than indicated in the
Typical Operating Circuit .
These capacitors determine the ripple on V+ and V-, but
MAX3212
+2.7V to +3.6V-Powered, 1A Supply Current,
3-Driver/5-Receiver, True RS-232 Transceiver
_______________________________________________________________________________________ 5
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
LN
Inductor/Diode Connection Point
2
LP
Inductor/Diode Connection Point
3
VCC
Supply Voltage Input, 2.7V to 3.6V
4
EN
Receiver Enable Control. Drive EN low to force receiver outputs into a high-Z state. Drive
EN high for normal operation. Cycle EN high then low to reset TRAN. TRAN is always low
when EN is high.
5
TRAN
Transition Detection Output. TRAN latches high when a transition occurs on any receiver
input while EN is low. Reset by cycling the EN pin high then low.
6
INVALID
Output of Invalid Signal Detector. Low if invalid RS-232 levels are present on all
receiver inputs, otherwise high.
7
R5OUTB
Complementary Output of R5OUT—always active
8–12
R1OUT–R5OUT
Receiver Outputs. Swing from GND to VCC. High-impedance when EN is low.
13, 14, 15
T1IN, T2IN, T3IN
Transmitter Inputs
16
V-
Negative Supply generated on-board
17, 18, 19
T3OUT, T2OUT, T1OUT Transmitter Outputs
20–24
R5IN–R1IN
Receiver Inputs
25
FORCEOFF
Drive low to shut down transmitters and on-board power supply, overriding all automatic
circuitry and FORCEON (see Figure 3).
26
FORCEON
Drive high to overide automatic circuitry, keeping transmitters on (see Figure 3).
FORCEOFF = high.
27
V+
Positive Supply generated on-board
28
GND
Ground
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相关代理商/技术参数 |
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| MAX3212EWI | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX3218C/D | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3218CAP | 功能描述:RS-232接口集成电路 Integrated Circuits (ICs) RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3218CAP+ | 功能描述:RS-232接口集成电路 1uA 1.8-4.25V Tcvr w/AutoShutdown RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3218CAP+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
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