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参数资料
型号： MC1488D
厂商： Texas Instruments, Inc.
英文描述： QUADRUPLE LINE DRIVERS
中文描述： 翻两番线驱动器
文件页数： 5/9页
文件大小： 87K
代理商： MC1488D
TYPICALAPPLICATION :
RS232CData Transmission
The Electronic Industries Association (EIA) has
released the RS232C specification detailing the
requirements for the interface between data
processing equipment. This standard specifies
not only the number and type of interface leads,
but also the voltage levels to be used. The
MC1488 quad driver and its companion circuit,
the MC1489 quad receiver, provide a complete
interface system between DTL or TTL logic levels
and the RS232C defined levels. The RS232C
requirements as applied to drivers are discussed
herein.
The required driver voltages are defined as
between 5 and 15 V in magnitude and are
positivefor a logic ”0” and negativefor a logic ”1”.
These voltages are so defined when the drivers
are terminated with a 3000 to 7000
resistor.
The MC1488 meets this voltage requirement by
converting a DTL/TTL logic level into RS232C
levels with one stageof inversion.
The RS232C specification further requires that
during transitions, the driver output slew rate
must not exceed 30 V per
μ
s. The inherent slew
rate of the MC1488 is much too fast for this
requirement. The current limited output of the
device can be used to control this slew rate by
connecting a capacitor to each driver output. The
required capacitor can be easily determined by
using the relationship C = I
OS
x
T/
V from
which Figure 12 is derived. Accordingly, a 330 pF
capacitor on each output will guarantee a worst
case slew rate of 30 V per
μ
s.
The interface driver is also required to withstand
an accidental short to any other conductor in an
interconnecting cable. The worst possible signal
on any conductor would be another driver using a
plus or minus 15 V, 500 mA source. The MC1488
is designed to indefinitely withstand such a short
to all four outputs in a package as long as the
power-supply voltages are greater than 9.0 V
(i.e., VS
≥
9.0 V ; V
EE
≤
- 9.0 V). In some
power-supply designs, a loss of system power
causes a low impedance on the power-supply
outputs. When this occurs, a low impedance to
ground would exist at the power inputs to the
MC1488 effectively shorting the 300
resistor to ground. If
all four outputs
were then
shorted to plus or minus 15 V, the power
dissipation in these resistors would be excessive.
Therefore, if the system is designed to permit low
impedances to ground at the power-suppies of
the drivers, a diode should be placed in each
power-supply lead to prevent over-heating in this
fault condition. These two diodes, as shown in
Figure 13, could be used to decouple all the
driver packages in a system.(These same diodes
will allow the MC1488 to withstand momentary
shorts to the
±
15 V limits specified in the earlier
output
APPLICATION INFORMATION
MC1488
5/9
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相关代理商/技术参数
参数描述
MC1488D1 功能描述:总线发射器 Quad Line Driver RoHS:否 制造商:Texas Instruments 数据速率:135 Mpps 接口: 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-56 封装:Reel
MC1488D1013TR 功能描述:总线发射器 Quad Line Driver RoHS:否 制造商:Texas Instruments 数据速率:135 Mpps 接口: 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-56 封装:Reel
MC1488DG 功能描述:RS-232接口集成电路 Quad Line EIA-232D Driver 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:
MC1488DR2 功能描述:RS-232接口集成电路 Quad Line EIA-232D 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:
MC1488DR2G 功能描述:RS-232接口集成电路 Quad Line EIA-232D Driver 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:
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