View MC148806_732956.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MC1488
RS-232 quad line driver
General features
I I I I I
Current limited output 10mA typ. Power-off source impedance 300 min. Simple slew rate control with external capacitor Flexible operating supply range Inputs are TTL and P compatible
DIP
Description
The MC1488 is a monolithic quad line driver designed to interface data terminal equipment with data communications equipment in conformance with the specifications of EIA Standard N RS232C.
SOP
Order codes
DIP14 MC1488P SO14 (Tape & reel) MC1488D1013TR
March 2006
Rev 4
1/
www.st.com 17
Contents
MC1488
Contents
1 2 3 4 5 6 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.1 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
MC1488
Diagram
1
Figure 1.
Diagram
Logic diagram
3/17
Pin description
MC1488
2
Figure 2.
Pin description
Pin connections
4/17
MC1488
Maximum ratings
3
Table 1.
Symbol VS VEE VIR VO Tamb Tstg
Maximum ratings
Absolute maximum ratings
Parameter Power supply voltage Power supply voltage Input voltage range Output signal voltage Operating ambient temperature Storage temperature range Value 15 -15 VIR = -15 to 7 15 0 to 75 -65 to 150 Unit V V V V C C
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data
Parameter Thermal resistance junction-ambient Max Plastic DIP14 200 SO14 165 Unit C/W
Table 2.
Symbol R thJA
5/17
Electrical characteristics
MC1488
4
Table 3.
Symbol IIL IIH VOH
Electrical characteristics
Electrical characteristics (VS = 9V 10%, VEE = -9V 10%, Tamb = 0 to 75C, unless otherwise specified)
Parameter Input Current Figure 3 Input Current Figure 3 Output Voltage Figure 4 Test Conditions Low Logic State V IL = 0 V High Logic State VIH = 5 V High Logic State R L = 3K, VIL = 0.8 V Low Logic State VIH = 1.9 V VS = 9V, VEE = -9V VS = 13V, VEE = -13V VS = -9V, VEE = 9V VEE = -13.2V, VS=13.2V 6 9 -6 -9 6 -6 VS = VEE = 0, VOL = 2V VIH = 1.9 V, VS = 9 V VIL = 0.8 V, VS = 9 V IS Positive Supply Current (RI = ) Figure 7 VIH = 1.9 V, VS = 12 V VIL = 0.8 V, VS = 12 V VIH = 1.9 V, VS = 15 V VIL = 0.8 V, VS = 15 V VIH = 1.9 V, VS = -9 V VIL = 0.8 V, VS = -9 V IEE Negative Supply Current V = 1.9 V, V = -12 V IH S (RL = ) VIL = 0.8 V, VS = -12 V Figure 7 VIH = 1.9 V, VS = -15 V VIL = 0.8 V, VS = -15 V PC Power Consumption VS = 9 V, VEE = -9 V VS = 12 V, VEE = -12 V -18 -13 300 15 4.5 19 5.5 20 6 25 mA 7 34 12 -17 -15 -23 -15 -34 mA -2.5 333 mW 567 mA A mA A 7 V 10.5 -7 V -10.5 10 -10 12 -12 mA mA Min. Typ. 1 Max. 1.6 10 Unit mA A
VOL
Output Voltage Figure 4
IOS+(1) IOS-(1) RO
Positive Output ShortCircuit Current Figure 5 Negative Output ShortCircuit Current Figure 5 Output Resistance Figure 6
1. Maximum package power dissipation may be exceeded if all outputs are shorted simultaneously.
6/17
MC1488
Electrical characteristics
Table 4.
Symbol tPHL tTHL tPHL tTHL
Switching characteristics (VS = 9 1V, VEE = -9 1V, Tamb = 25C)
Parameter Propagation Delay Time Figure 8 Fall Time Figure 7 Propagation Delay Time Figure 8 Fall Time Figure 8 Test Conditions ZI = 3 K and 15 pF ZI = 3 K and 15 pF ZI = 3 K and 15 pF ZI = 3 K and 15 pF Min. Typ. 275 45 110 55 Max. 350 75 175 100 Unit ns ns ns ns
7/17
Test circuit
MC1488
5
Test circuit
Figure 3. Input current
Figure 4.
Output voltage
Figure 5.
Output short-circuit current
8/17
MC1488 Figure 6. Output resistance (power off)
Test circuit
Figure 7.
Power supply currents
Figure 8.
Switching response
9/17
Test circuit
MC1488
Figure 9.
Transfer characteristics vs input voltage
Figure 10. Short-circuit output current vs temperature
Figure 11.
Output slew-rate load capacitance
Figure 12. Output voltage and current limiting characteristics
Figure 13. Maximum operating temperature vs power supply voltage
10/17
MC1488
Typical applications
6
Typical applications
Figure 14. RS232C Data transmission
6.1
Application information
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 15V in magnitude and are positive for a logic "0" and negative for 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 stage of inversion. The RS232C specification further requires that during transitions, the driver output slew rate must not exceed 30V per 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 = IOS x T/V from which Figure 15. is derived. Accordingly, a 330 pF capacitor on each output will guarantee a worst case slew rate of 30V per 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 15V, 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 9.0V (i.e., VS 9.0V; V EE 9.0V). 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 300W output resistor to ground. If all four outputs were then shorted to plus or minus 15V, the power dissipation in these resistors would be excessive. Therefore, if the system is designed to permit low impedances to ground at the power-supplies of the drivers, a diode should be placed in each power-supply lead to prevent over-heating in this fault condition.
11/17
Typical applications
MC1488
These two diodes, as shown in Figure 13, could be used to decoupled all the driver packages in a system. (These same diodes will allow the MC1488 to withstand momentary shorts to the 15V limits specified in the earlier Standard RS232B). The addition of the diodes also permits the MC1488 to withstand faults with power-supplies of less than the 9.0V stated above. The maximum short-circuit current allowable under fault conditions is more than guaranteed by the previously mentioned 10 mA output current limiting. The MC1488 is an extremely versatile line driver with a mired of possible applications. Several features of the drivers enhance this versatility: 1. Output Current Limiting - this enables the circuit designer to define the output voltage levels independent of power-supplies and can be accomplished by diode clamping of the output pins. 2. Power-Supply Range - as can be seen from the schematic drawing of the drivers, the positive and negative driving elements of the device are essentially independent and do not require matching power-supplies. In fact, the positive supply can very from a minimum seven volts (required for driving the negative pulldown section) to the maximum specified 15V. The negative supply can vary from approximately -2.5V to the minimum specified 15V. The MC1488 will drive the output to within 2V of the positive or negative supplies as long as the current output limits are not exceeded. The combination of the current-limiting and supply-voltage features allow a wide combination of possible outputs within the same quad package. Figure 15. Slew-rate load vs capacitance for ISC = 10mA
Figure 16. Power supply protection to meet Power-off fault conditions
12/17
MC1488
Typical applications
Plastic DIP-14 MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 1.27 3.3 2.54 0.050 8.5 2.54 15.24 7.1 5.1 0.130 0.100 0.51 1.39 0.5 0.25 20 0.335 0.100 0.600 0.280 0.201 1.65 TYP MAX. MIN. 0.020 0.055 0.020 0.010 0.787 0.065 TYP. MAX. inch
P001A
13/17
Typical applications
MC1488
SO-14 MECHANICAL DATA
DIM. A A1 A2 B C D E e H h L k ddd 5.8 0.25 0.4 0 mm. MIN. 1.35 0.1 1.10 0.33 0.19 8.55 3.8 1.27 6.2 0.50 1.27 8 0.100 0.228 0.010 0.016 0 TYP MAX. 1.75 0.25 1.65 0.51 0.25 8.75 4.0 MIN. 0.053 0.004 0.043 0.013 0.007 0.337 0.150 0.050 0.244 0.020 0.050 8 0.004 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.344 0.157
0016019D
14/17
MC1488
Typical applications
Tape & Reel SO-14 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.4 9 2.1 3.9 7.9 12.8 20.2 60 22.4 6.6 9.2 2.3 4.1 8.1 0.252 0.354 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.260 0.362 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
15/17
Revision history
MC1488
7
Table 5.
Date
Revision history
Revision history
Revision 4 Changes Order codes has been updated and new template.
17-Mar-2006
16/17
MC1488
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZE REPRESENTATIVE OF ST, ST PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS, WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
(c) 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
17/17

▲Up To Search▲

Price & Availability of MC148806

	To Download MC148806 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .