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Hello, Please ask a question about DM74LS191 Datasheet
# Example questions:
➢ What is the maximum clock frequency for the ls190 and ls191 counters, as specified in the switching characteristics table?
➢ What package types are available for the dm74ls190 and dm74ls191, according to the physical dimensions section?
➢ What constitutes a 'critical component'?
| Part No. | DM74LS191 |
| Manufacturer | NSC |
| Size | 174 Kbytes |
| Pages | 8 pages |
| Description | Synchronous 4-Bit Up/Down Counters with Mode Control |
1. Product Identification & Overview
️· Product: LS190 (Decade Counter) and LS191 (Binary Counter)
️· Type: Logic Counters
️· Manufacturer: National Semiconductor (now part of Texas Instruments - TI)
️· Datasheet Purpose: Provides electrical characteristics, timing diagrams, logic diagrams, physical dimensions, and ordering information.
2. Electrical Characteristics & Ratings (Highlights - Complete details are in the datasheet)
️· Supply Voltage (VCC): Implies a 5V operation is typical, based on testing conditions.
️· Operating Temperature: Implied to be 25°C (standard room temperature) for the timing diagrams.
️· Propagation Delays: These are crucial for understanding the speed of the counters. Key values include:
- tPLH & tPHL (Low to High/High to Low Propagation Delay): In the range of 20ns - 59ns, dependent on load.
- fMAX (Maximum Clock Frequency): 20 MHz (for specific test conditions)
3. Timing Diagrams (Key Points)
️· Detailed timing diagrams are provided for various input/output conditions (e.g., count, inhibit, enable, ripple clock, clock to output).
️· The diagrams specify delays (propagation delays) for different signals.
️· The timing is tested at specific load conditions (RL and CL values)
4. Logic Diagrams
️· LS190: Decade counter logic diagram.
️· LS191: Binary counter logic diagram.
️· Detailed internal logic for operation.
5. Physical Dimensions & Package Information
️· Packages Supported:
- 16-Lead Ceramic Dual-In-Line (J)
- 16-Lead Small Outline Molded (M)
- 16-Lead Molded Dual-In-Line (N)
- 16-Lead Ceramic Flat (W)
️· Order Numbers are provided for each package type.
️· Dimensions are given in both inches and millimeters.
6. Ordering Information
️· LS190 and LS191 are available in multiple package types.
️· NS Package Numbers are listed for reference.
7. Important Notes
️· Life Support Policy: National Semiconductor's policy regarding the use of their products in life-support systems. Requires explicit approval.
️· Disclaimer: Standard legal disclaimer regarding the use of the information provided.
1. Product Identification & Overview
️· Product: LS190 (Decade Counter) and LS191 (Binary Counter)
️· Type: Logic Counters
️· Manufacturer: National Semiconductor (now part of Texas Instruments - TI)
️· Datasheet Purpose: Provides electrical characteristics, timing diagrams, logic diagrams, physical dimensions, and ordering information.
2. Electrical Characteristics & Ratings (Highlights - Complete details are in the datasheet)
️· Supply Voltage (VCC): Implies a 5V operation is typical, based on testing conditions.
️· Operating Temperature: Implied to be 25°C (standard room temperature) for the timing diagrams.
️· Propagation Delays: These are crucial for understanding the speed of the counters. Key values include:
- tPLH & tPHL (Low to High/High to Low Propagation Delay): In the range of 20ns - 59ns, dependent on load.
- fMAX (Maximum Clock Frequency): 20 MHz (for specific test conditions)
3. Timing Diagrams (Key Points)
️· Detailed timing diagrams are provided for various input/output conditions (e.g., count, inhibit, enable, ripple clock, clock to output).
️· The diagrams specify delays (propagation delays) for different signals.
️· The timing is tested at specific load conditions (RL and CL values)
4. Logic Diagrams
️· LS190: Decade counter logic diagram.
️· LS191: Binary counter logic diagram.
️· Detailed internal logic for operation.
5. Physical Dimensions & Package Information
️· Packages Supported:
- 16-Lead Ceramic Dual-In-Line (J)
- 16-Lead Small Outline Molded (M)
- 16-Lead Molded Dual-In-Line (N)
- 16-Lead Ceramic Flat (W)
️· Order Numbers are provided for each package type.
️· Dimensions are given in both inches and millimeters.
6. Ordering Information
️· LS190 and LS191 are available in multiple package types.
️· NS Package Numbers are listed for reference.
7. Important Notes
️· Life Support Policy: National Semiconductor's policy regarding the use of their products in life-support systems. Requires explicit approval.
️· Disclaimer: Standard legal disclaimer regarding the use of the information provided.
| Part No. | DM74LS191 |
| Manufacturer | NSC |
| Size | 174 Kbytes |
| Pages | 8 pages |
| Description | Synchronous 4-Bit Up/Down Counters with Mode Control |
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