SN74LS299N - Electronic component TEXAS INSTRUMENTS - Free user manual and instructions
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| Product Type | Integrated Circuit (IC) |
| Function | 8-bit Universal Shift Register with 3-State Outputs |
| Technology | Low-Power Schottky TTL (LS-TTL) |
| Package Type | 20-pin Plastic Dual In-Line Package (PDIP) |
| Body Dimensions (Approx.) | 25.4 mm x 7.62 mm (excluding leads) |
| Weight (Approx.) | 2.0 grams |
| Supply Voltage | 4.75 V to 5.25 V (Typical 5 V) |
| Operating Temperature Range | 0°C to +70°C |
| Number of Bits | 8 |
| Shift Modes | Parallel Load, Shift Right, Shift Left, Hold |
| Output Type | 3-State (for bus-oriented applications) |
| Input/Output Compatibility | TTL compatible |
| Typical Clock Frequency | Up to 25 MHz |
| Propagation Delay (Typical) | 30 ns (clock to output) |
| Power Consumption | Low-power Schottky design |
| Primary Applications | Bus-oriented register storage, serial/parallel data conversion, digital delay lines |
| Mounting Style | Through-hole |
| Maintenance | None required; handle with standard ESD precautions |
| Cleaning | Isopropyl alcohol wipe for pins if contaminated |
| Spare Parts | Not applicable; replace entire IC if defective |
| Repairability | Non-repairable; solder replacement recommended |
| RoHS Compliance | Yes (lead-free soldering possible) |
Frequently Asked Questions - SN74LS299N TEXAS INSTRUMENTS
What is the Texas Instruments SN74LS299N?
The SN74LS299N is a 8-bit universal shift register from Texas Instruments. It operates on TTL logic and features 3-state outputs, making it ideal for bus-oriented data storage and transfer applications.
What are the main functions of the SN74LS299N?
The SN74LS299N can perform parallel loading, shift right, shift left, and hold operations. It has synchronous enable inputs and a clock input that controls all operations.
What is the recommended supply voltage?
The recommended supply voltage is 5.0 V (typical), with an operating range from 4.75 V to 5.25 V. The device is designed for standard TTL power levels.
How many pins does the SN74LS299N have?
The SN74LS299N comes in a 20-pin PDIP (Plastic Dual In-Line Package). Pin assignments include parallel data inputs/outputs, shift control pins, clock, and power (VCC and GND).
What does '3-state' output mean on this IC?
A 3-state output can be in one of three states: high, low, or high-impedance (Hi-Z). The Hi-Z state allows multiple devices to share the same data bus without causing conflicts.
Can the SN74LS299N be used with microcontrollers?
Yes, the SN74LS299N can interface with microcontrollers, but note that its outputs are TTL levels. For 3.3 V microcontrollers, level shifting or open-drain configuration may be needed. The inputs are TTL-compatible and can accept 5 V logic.
What are the typical applications of this shift register?
Typical applications include parallel-to-serial or serial-to-parallel conversion, data storage in bus systems, digital delay lines, and LED multiplexing.
How do I set the SN74LS299N to shift right?
To shift right, apply the appropriate logic levels to the mode control inputs (S0 and S1) and the serial input (DSR). Refer to the datasheet truth table for exact pin configurations.
What is the maximum clock frequency?
The typical maximum clock frequency is 25 MHz for the LS-series. This makes it suitable for moderate-speed digital systems.
How should I handle the SN74LS299N to prevent damage?
Use standard ESD precautions such as anti-static wrist straps and conductive foam. Avoid exceeding the absolute maximum ratings on any pin. When soldering, keep temperature below 260°C for less than 10 seconds.
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Brand : TEXAS INSTRUMENTS
Model : SN74LS299N
Category : Electronic component