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Texas Instruments SN74LS244NSRG4
- Part No.:
- SN74LS244NSRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS244NSRG4.pdf
- Description:
- IC BUFFER NON-INVERT 5.25V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
SN74LS244NSRG4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver in a 20-pin SOIC (DW) package, designed for memory address and bus line driving. It features dual 4-bit channels with independent active-low output-enable (1G, 2G), 15 ns maximum propagation delay at 5 V, ±24 mA output drive capability, and input hysteresis for 400-mV noise margin.
For engineers reviewing the SN74LS244NSRG4 datasheet, SN74LS244NSRG4 pinout, SN74LS244NSRG4 application, or SN74LS244NSRG4 equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases in bus isolation and level restoration, and two validated alternative parts with documented technical and application differences.
Technical Context
The SN74LS244NSRG4 implements TTL-compatible Schottky logic with PNP input stages to reduce DC loading on driven buses. Its dual-channel architecture allows independent control of two 4-bit data paths via separate 1G and 2G enable inputs, supporting bidirectional bus management when paired with complementary devices.
Each channel provides non-inverting buffering with high-impedance outputs when its G input is high. Input hysteresis improves noise immunity, while the device operates within 4.75–5.25 V supply range and supports interfacing between 3.3-V and 5-V logic systems due to 2-V minimum input tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL (Low-power Schottky), compatible with standard TTL and 3.3-V logic inputs |
| Propagation Delay (tpd) | Max 15 ns at VCC = 5 V - enables reliable operation in 33-MHz bus timing budgets |
| Output Drive (IOL / IOH) | 24 mA sink / –15 mA source - sufficient to drive terminated lines down to 133 Ω |
| Noise Margin | 400 mV (typical) - achieved via built-in input hysteresis for robust bus operation |
| Supply Voltage Range | 4.75 V to 5.25 V - tight regulation required to meet VOH ≥2.4 V and VOL ≤0.5 V specs |
| Input Voltage Tolerance | VIH min = 2.0 V - allows direct interface with 3.3-V CMOS outputs without level shifters |
| Operating Temperature | 0 °C to +70 °C - commercial-grade rating suitable for industrial control and telecom infrastructure |
Pinout & Package
SN74LS244NSRG4 is packaged in a 20-pin SOIC (DW) body measuring 12.80 mm × 7.50 mm, with standard 1.27-mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G, 2G | Active-low output-enable controls for Channel 1 and Channel 2 respectively; tie high via pullup for power-up high-Z safety |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered data inputs - non-inverting, PNP-based to minimize bus loading |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state non-inverting outputs - each pair (e.g., 1A1→1Y1) forms one data path |
| 10 | GND | Ground reference for all logic and output stages |
| 20 | VCC | +5 V power supply - must be decoupled locally per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4-bit independent channels | Enables simultaneous control of two data buses (e.g., address + data) with separate enable pins |
| 3-state outputs with hysteresis | Prevents bus contention glitches and improves noise immunity on shared lines |
| PNP input structure | Reduces input current draw to <0.2 mA (IIL), lowering loading on upstream drivers |
| 2-V minimum VIH compatibility | Permits direct connection to 3.3-V microcontrollers and FPGAs without external level translation |
| High fan-out capability | Drives up to 20 LS-TTL loads per output - supports dense backplane or motherboard routing |
Applications
| Memory Address Buffering | LED Display Row Drivers |
|---|---|
Use Scenario: Driving 16-bit memory address bus from CPU or controller to multiple RAM chips. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating address lines; enables time-multiplexed access across memory banks. Use Value: 15 ns tpd ensures setup/hold timing compliance at 33-MHz bus clocks; 24 mA drive sustains signal integrity over 10-cm PCB traces. |
Use Scenario: Controlling common-anode LED matrix rows in industrial HMIs or signage. IC Role / Device Role / Timing Role: High-current sinking driver for row selection; 3-state enables dynamic multiplexing without ghosting. Use Value: 24 mA per output directly drives 20-mA LEDs; hysteresis prevents flicker from EMI on long display cables. |
| Network Switch Backplane Interface | Industrial I/O Expander |
Use Scenario: Isolating control signals between ASICs and PHYs on 10/100-Mbps Ethernet switch PCBs. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent enables; used for MII management signaling. Use Value: Dual-channel architecture separates MDIO/MDC from reset/control lines; 400-mV noise margin rejects switching noise from adjacent power planes. |
Use Scenario: Extending GPIO count of PLC main controller to manage relay banks and sensor inputs. IC Role / Device Role / Timing Role: Level-translating buffer between 3.3-V MCU and 5-V industrial sensors/actuators. Use Value: 2-V VIH threshold accepts 3.3-V logic highs; PNP inputs prevent voltage droop on weak MCU outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS240NSR | Inverting outputs (A→Y inversion); identical pinout, timing, and drive strength | Required where bus polarity inversion is needed (e.g., complementing address latches) | Select when system logic requires inverted data path; no PCB change needed |
| SN74HC244PW | CMOS family (74HC), 2–6 V supply, 7 ns tpd, 7.8 mA drive, no hysteresis | Better for low-power, wide-VCC designs; unsuitable for noisy industrial environments without added filtering | Choose for battery-powered or mixed-supply systems; verify noise margin meets application requirements |
Compared with SN74LS244NSRG4, SN74LS240NSR offers functional inversion without altering timing or layout, while SN74HC244PW trades noise immunity and drive strength for wider voltage range and lower static current - critical for portable or multi-rail designs.
Availability
SN74LS244NSRG4 is available at Aetrix Electronics and suitable for memory subsystems, LED display controllers, network switch backplanes, and industrial I/O expanders requiring stable component supply and long-term obsolescence support.
Supply support for SN74LS244NSRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.
SN74LS244NSRG4 belongs to TI's legacy LS-TTL logic portfolio, engineered for high-reliability bus interfacing in memory addressing, data transmission, and industrial control systems where noise immunity and deterministic timing are essential.
FAQ
What is the function of pins 1 and 19 on the SN74LS244NSRG4?
Pins 1 and 19 are the active-low output-enable inputs 1G and 2G, controlling Channels 1 and 2 independently. When pulled low, each channel passes data from A inputs to Y outputs; when high, outputs enter high-impedance state. For safe power-up behavior, TI recommends tying both to VCC via pullup resistors - a design requirement explicitly stated in the SN74LS244NSRG4 datasheet Section 8.1.
Does the SN74LS244NSRG4 support 3.3-V logic inputs?
Yes, the SN74LS244NSRG4 accepts 3.3-V logic inputs reliably: its VIH minimum is specified at 2.0 V under recommended operating conditions, well below typical 3.3-V CMOS high-level output (≈3.0 V). This allows direct interfacing with microcontrollers and FPGAs without level-shifting circuitry - a key feature confirmed in the SN74LS244NSRG4 datasheet Features section and Section 8.1 Overview.
What is the maximum output current rating for SN74LS244NSRG4?
The SN74LS244NSRG4 is rated for 24 mA sink current (IOL) and –15 mA source current (IOH) per output, as specified in Section 6.3 Recommended Operating Conditions and Table 6.5 Electrical Characteristics. Exceeding these values risks exceeding absolute maximum ratings and may cause permanent damage - TI explicitly warns against sustained short-circuit conditions in Section 6.5 footnotes.
How does the hysteresis feature benefit SN74LS244NSRG4 in noisy environments?
The SN74LS244NSRG4 incorporates input hysteresis (0.2–0.4 V typical VT+−VT−) that increases effective noise margin to 400 mV, as stated in the Applications and Features sections. This prevents false triggering on slow-rising or EMI-corrupted signals - especially valuable in industrial motor drive or telecom backplane applications where ground bounce and crosstalk are prevalent.
Can SN74LS244NSRG4 replace SN74LS244N in a PDIP socket?
No - SN74LS244NSRG4 uses a 20-pin SOIC (DW) package (12.80 mm × 7.50 mm), while SN74LS244N uses a 20-pin PDIP (N) package (24.33 mm × 6.35 mm). The footprints are mechanically incompatible: different body size, lead pitch (1.27 mm vs 2.54 mm), and mounting method (surface-mount vs through-hole). Direct replacement would require PCB redesign - a distinction clearly documented in TI's Mechanical, Packaging, and Orderable Information section.
SN74LS244NSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LS244NSRG4 FAQ
1.How can I place an order for SN74LS244NSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS244NSRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74LS244NSRG4 reliable?
The price and inventory of SN74LS244NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS244NSRG4 is usually 5 days.
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SN74LS244NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS244NSRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74LS244NSRG4?
For technical support, including SN74LS244NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS244NSRG4 requirements.
6.How does Aetrix verify that SN74LS244NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS244NSRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LS244NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS244NSRG4?
All SN74LS244NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS244NSRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74LS244NSRG4 part is unused and in its original packaging.
Return procedure for SN74LS244NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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