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MAX3218CPP+ 开发手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
接口芯片
封装:
PDIP-20
描述:
收发器 120Kbps
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
MAX3218CPP+数据手册
Page:
of 13 Go
若手册格式错乱，请下载阅览PDF原文件
Figure 3. An RS-232 signal. Channel 1 is the bus output signal of the transmitter; Channel 2 is the logic
output of the receiver.
In later product generations like the MAX3232, the EIA-232 levels are defined as ±5V into 5kΩ. With a new
low-dropout output stage, Maxim introduced RS-232 transceivers with internal charge pumps that provided
regulated ±5.5V outputs. This design allows the transmitter outputs to maintain RS-232-compatible levels
with a minimum amount of supply current.
How does the integrated charge pump work? The first charge pump works as a voltage doubler and creates
+10V from the 5V supply, minus some losses. The second charge-pump converter is configured as an
inverter and makes -10V from the +10V, again with some losses. These ±10V power supplies are then used
to power the RS-232 transmitters.
High-ESD protection
All RS-232 devices incorporate electro static discharge (ESD) protection on all pins to protect against the
ESD (typically ±2kV) encountered during handling and assembly. As handheld and portable equipment
adopted RS-232 serial communication, those applications required greater ESD protection against Human
Body Model (HBM, for which the industry standard requires greater than ±2kV of ESD protection). Maxim's
ESD-protected RS-232 transceivers offer ±15kV ESD per HBM protection on their RS-232 transmitter-
output and receiver-input pins. Some devices, such as the MAX3238E, offer the ±15kV ESD protection on
both the RS-232 BUS and CMOS pins.
The ±15kV ESD-protected RS-232 devices usually have the same pinout and functionality as the standard
RS-232 devices, so these parts can be easily substituted without modification to the board layout or
footprint. The MAX3232 and the MAX3232E, for example, share the same pinout, package type, and
functionality.
Low-voltage operation
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