Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

MC1489D1013TR Datasheet(PDF) 8 Page - STMicroelectronics

Part # MC1489D1013TR
Description  QUAD LINE RECEIVERS
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

MC1489D1013TR Datasheet(HTML) 8 Page - STMicroelectronics

Back Button MC1489D1013TR Datasheet HTML 4Page - STMicroelectronics MC1489D1013TR Datasheet HTML 5Page - STMicroelectronics MC1489D1013TR Datasheet HTML 6Page - STMicroelectronics MC1489D1013TR Datasheet HTML 7Page - STMicroelectronics MC1489D1013TR Datasheet HTML 8Page - STMicroelectronics MC1489D1013TR Datasheet HTML 9Page - STMicroelectronics MC1489D1013TR Datasheet HTML 10Page - STMicroelectronics MC1489D1013TR Datasheet HTML 11Page - STMicroelectronics MC1489D1013TR Datasheet HTML 12Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 13 page
background image
MC1489/MC1489A
8/13
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
Ω and 7000Ω 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 VBE.
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
Ω 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.
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. Figures 2, 4 and 5 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.
Figures 9 and 10 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
11).
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 12 where two receivers are slaved
to the same line that must still meet the RS-232C impedance requirement.
Figure 13 : Typical Turn-on Threshold vs
Capacitance from Response Control Pin to GND
Figure 14 : Typical Turn-on Threshold vs
Capacitance from Response Control Pin to GND


Similar Part No. - MC1489D1013TR

ManufacturerPart #DatasheetDescription
logo
STMicroelectronics
MC1489D1013TR STMICROELECTRONICS-MC1489D1013TR Datasheet
242Kb / 17P
   Quad line receivers
More results

Similar Description - MC1489D1013TR

ManufacturerPart #DatasheetDescription
logo
STMicroelectronics
MC1489 STMICROELECTRONICS-MC1489_06 Datasheet
242Kb / 17P
   Quad line receivers
logo
ON Semiconductor
MC1489 ONSEMI-MC1489 Datasheet
98Kb / 10P
   Quad Line Receivers
April, 2004 ??Rev. 8
logo
ARTSCHIP ELECTRONICS CO...
MC1489 ARTSCHIP-MC1489 Datasheet
2Mb / 9P
   QUAD LINE RECEIVERS
logo
National Semiconductor ...
DS26LS32C NSC-DS26LS32C Datasheet
140Kb / 6P
   Quad Differential Line Receivers
DS3650 NSC-DS3650 Datasheet
197Kb / 10P
   Quad Differential Line Receivers
DS1650 NSC-DS1650 Datasheet
217Kb / 8P
   Quad Differential Line Receivers
logo
Texas Instruments
MC3450 TI1-MC3450_08 Datasheet
152Kb / 9P
[Old version datasheet]   QUAD DIFFERENTIAL LINE RECEIVERS
MC3450 TI-MC3450 Datasheet
139Kb / 9P
[Old version datasheet]   QUAD DIFFERENTIAL LINE RECEIVERS
logo
National Semiconductor ...
DS26F32M NSC-DS26F32M Datasheet
207Kb / 6P
   Quad Differential Line Receivers
DS26LS32AC NSC-DS26LS32AC Datasheet
201Kb / 8P
   Quad Differential Line Receivers
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com