- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377955 > MC1488AD1013TR (意法半導(dǎo)體) Quad line receivers PDF資料下載
參數(shù)資料
| 型號(hào)： | MC1488AD1013TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Quad line receivers |
| 中文描述： | 四線接收器 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 217K |
| 代理商： | MC1488AD1013TR |
MC1489/MC1489A
Application information
11/17
8
Application information
The Electronic Industries Association (EIA) has released the RS-232C specification
detailing the requirements for the interface between data processing equipment and data
communications 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 RS-232C defined levels. The RS-232C requirements as
applied to receivers are discussed herein.
The required input impedance is defined as between 3000
and 7000
for input voltages
between 3.0 and 25V in magnitude; and any voltage on the receiver input in an open circuit
condition must be less than 2.0V in magnitude. The MC1489 circuits meet these
requirements with a maximum open circuit voltage of one V
BE
.
The receiver shall detect a voltage between - 3.0 and - 25V as a Logic "1" and inputs
between + 3.0 and + 2.5V as a Logic "0". On some interchange leads, an open circuit of
power "OFF" condition (300
or more to ground) shall be decoded as an "OFF" condition or
Logic "1". For the reason, the input hysteresis thresholds of the MC1489 circuits are all
above ground. Thus an open or grounded input will cause the same output as a negative or
Logic "1" input.
8.1
Device characteristics
The MC1489 interface receivers have internal feedback from the second stage to the input
stage providing input hysteresis for noise rejection. The MC1489 input has typical turn-on
voltage of 1.25V and turn-off of 1.0 V for a typical hysteresis of 250mV. The MC1489A has
typical turn-on of 1.95V and turn-off of 0.8V for typically 1.15V of hysteresis.
Each receiver section has an external response control node in addition to the input and
output pins, thereby allowing the designer to vary the input threshold voltage levels. A
resistor can be connected between this node and an external power supply.
Figure 4.
,
Figure 6.
and
Figure 7.
illustrate the input threshold voltage shift possible through this
technique.
This response node can also be used for the filtering of the high-frequency, high-energy
noise pulses.
Figure 11.
and
Figure 12.
show typical noise-pulse rejection for external
capacitors of various sizes.
These two operations on the response node can be combined or used individually for may
combinations of interfacing applications. The MC1489 circuits are particularly useful for
interfacing between MOS circuits and MDTL/MTTL logic systems. In this application, the
input threshold voltages are adjusted. (with the appropriate supply and resistor values) to
fall in the center of the MOS voltage logic levels (see
Figure 13.
).
The response node may also be used as the receiver input as long as the designer realizes
that he may not drive this node with a low impedance source to a voltage greater than one
diode above ground or less than one diode below ground. This feature is demonstrated in
Figure 14.
where two receivers are slaved to the same line that must still meet the RS-232C
impedance requirement.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC33001 | GENERAL PURPOSE SINGLE JEFT OPERATIONAL AMPLIFIERS |
| MC33001A | GENERAL PURPOSE SINGLE JEFT OPERATIONAL AMPLIFIERS |
| MC33001AD | GENERAL PURPOSE SINGLE JEFT OPERATIONAL AMPLIFIERS |
| MC33001AH | GENERAL PURPOSE SINGLE JEFT OPERATIONAL AMPLIFIERS |
| MC33001AN | GENERAL PURPOSE SINGLE JEFT OPERATIONAL AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC1488D | 功能描述:RS-232接口集成電路 Quad Line EIA-232D 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: |
| MC1488D1 | 功能描述:總線發(fā)射器 Quad Line Driver RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:135 Mpps 接口: 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-56 封裝:Reel |
| MC1488D1013TR | 功能描述:總線發(fā)射器 Quad Line Driver RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:135 Mpps 接口: 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 70 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-56 封裝:Reel |
| MC1488DG | 功能描述:RS-232接口集成電路 Quad Line EIA-232D Driver 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: |
| MC1488DR2 | 功能描述:RS-232接口集成電路 Quad Line EIA-232D 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: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。