M5451B7 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
REV. 2 FEATURES SUMMARY ■ M5450 34 OUTPUTS/15mA SINK ■ M5451 35 OUTPUTS/15mA SINK ■ CURRENT GENERATOR OUTPUTS (NO EXTERNAL RESISTORS REQUIRED) ■ CONTINUOUS BRIGHTNESS CONTROL ■ SERIAL DATA INPUT ■ ENABLE (ON M5450) ■ WIDE SUPPLY VOLTAGE OPERATION ■ TTL COMPATIBILITY Application Examples: ■ MICROPROCESSOR DISPLAYS ■ INDUSTRIAL CONTROL INDICATOR ■ RELAY DRIVER ■ INSTRUMENTATION READOUTS
DESCRIPTION
The M5450 and M5451 are monolithic MOS inte- grated circuits produced with an N-channel silicon gate technology. They are available in 40-pin dual in-line plastic packages. A single pin controls the LED display brightness by setting a reference current through a variable re- sistor connected to V DD or to a separate supply of 13.2V maximum. Figure 1. Packages
Figure 2. Pin Connection Figure 3. Block Diagram
35 OUTPUT BUFFERS
35 LATCHES
Table 2. Static Electrical Characteristics Note: 1. Output matching is calculated as the percent variation from I MAX + IMIN/2.
- With a fixed resistor on the brightness input some variation in brightness will occur from one device to another.
- Absolute maximum for each output should be limited to 40mA.
O voltage should be regulated by the user. See Figure 7 and Figure 8 for allowable VO versus IO operation. Figure 4. Input Data Format
Figure 9. Basic Electronically Tuned Radio Or Tv System Figure 10. Duplexing 8 Digits With One M5450
34 SEGMENTS
Table 3. Order Codes
Table 4. PDIP40 - Mechanical Data Figure 14. PDIP40 - Package Dimensions
Table 5. PLCC44 - Mechanical Data Figure 15. PLCC44 - Package Dimensions Note: Drawing is not to scale.
M5450, M5451
REVISION HISTORY
Table 6. Revision History 14-Mar-2004 2 Stylesheet update. No content change.
M5450, M5451 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publicati on are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners © 2004 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