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Texas Instruments SN74LV244ATNSR
- Part No.:
- SN74LV244ATNSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV244ATNSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,972
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Product details
Overview
SN74LV244ATNSR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for memory-address, clock, and bus-oriented applications. It operates from 4.5 V to 5.5 V, features TTL-voltage-compatible inputs, supports partial-power-down via Ioff, and delivers typical propagation delay of 5.4 ns at 5 V. Used in industrial control backplanes and embedded data buses.
For engineers reviewing the SN74LV244ATNSR datasheet, SN74LV244ATNSR pinout, SN74LV244ATNSR application, or SN74LV244ATNSR equivalent, key selection criteria include 3-state output control timing (tPZH/tPLZ ≤ 12 ns), Ioff leakage (<5 µA), mixed-mode voltage support, and SOP-20 package compatibility with legacy 74-series layouts.
Technical Context
This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) inputs-1OE controls Y1–Y4, 2OE controls Y5–Y8. Outputs enter high-impedance state when respective OE is high, enabling bidirectional bus isolation without external logic.
It implements Ioff circuitry to disable outputs during power-down, preventing current backflow when VCC = 0 V while inputs remain biased. Input thresholds (VIH = 2 V, VIL = 0.8 V) are TTL-compatible across the full 4.5–5.5 V supply range, ensuring interoperability with legacy 5-V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V rails with ±10% tolerance. |
| Propagation Delay (tpd) | 5.4 ns typical at 5 V, CL = 15 pF - Enables reliable timing in 100+ MHz bus systems with margin. |
| Ioff Leakage | <5 µA at 0–5.5 V - Prevents damaging back-current during hot-swap or partial-power-down sequences. |
| Output Drive | ±16 mA per output - Sufficient to drive 50-pF loads and standard CMOS/TTL fan-out (10+ units). |
| Input Compatibility | TTL-level VIH/VIL (2 V/0.8 V) - Direct interface with 74LS, 74F, and microcontroller GPIO without level shifters. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial handling requirements without additional protection. |
| Operating Temp | –40°C to +85°C - Qualified for extended-temperature industrial and automotive under-hood environments. |
Pinout & Package
SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.27 mm lead pitch, gull-wing leads, 2.65 mm max height. RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low output-enable controls first/second 4-bit buffer group independently. |
| 2–5, 13–16 | 1A1–1A4 / 2A1–2A4 | Noninverting input terminals for respective buffer sections. |
| 6–9, 11–14 | 1Y1–1Y4 / 2Y1–2Y4 | 3-state buffered outputs - high-Z when OE = high, otherwise Y = A. |
| 10 | GND | Ground reference for all internal circuitry and output drivers. |
| 20 | VCC | Primary 4.5–5.5 V supply for logic core and output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff Partial-Power-Down Support | Disables outputs and limits Ioff to <5 µA when VCC = 0 V - enables safe insertion into live backplanes. |
| TTL-Compatible Inputs | VIH = 2 V, VIL = 0.8 V at 4.5–5.5 V - eliminates need for external level translators with legacy 5-V logic. |
| Low Ground Bounce (VOLP) | <0.8 V at VCC = 5 V - reduces noise coupling into shared ground planes in dense PCB layouts. |
| Fast Enable/Disable Timing | tPZH/tPLZ ≤ 8 ns at CL = 15 pF - minimizes bus contention windows during direction switching. |
| Mixed-Mode Voltage Operation | Inputs tolerate 0–5.5 V regardless of VCC - allows interfacing with 3.3-V controllers driving 5-V buses. |
Applications
| Industrial Backplane Bus Driver | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Driving address/data lines across a 200-mm 5-V backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU from peripheral slots; OE synchronized to bus grant signal. Use Value: 5.4-ns tpd ensures setup/hold compliance at 20-MHz bus clock; ±16-mA drive sustains signal integrity over 15-pF trace load. | Use Scenario: Expanding GPIO count of an ARM Cortex-M4 running at 3.3 V to control 5-V relays and displays. IC Role / Device Role / Timing Role: Level-shifting buffer with mixed-mode inputs - accepts 3.3-V logic levels while sourcing 5-V outputs. Use Value: TTL-compatible VIH/VIL allows direct connection to MCU pins; Ioff prevents backfeed when MCU is in deep sleep. |
| Legacy System Memory Interface | Test Equipment Signal Routing |
Use Scenario: Interfacing FPGA-based memory controller to SRAM modules requiring strict 5-V timing margins. IC Role / Device Role / Timing Role: Address latch driver with OE tied to FPGA write-enable - enables/disables bus access on cycle boundary. Use Value: tPLZ/tPHZ ≤ 8 ns guarantees clean bus release before next cycle; VOLP < 0.8 V avoids false reads due to ground bounce. | Use Scenario: Multiplexing multiple instrument signals onto shared test head cabling in automated test equipment. IC Role / Device Role / Timing Role: 3-state bus switch controlled by test sequencer - selects one DUT channel at a time. Use Value: Independent 1OE/2OE pins allow staggered enable/disable for glitch-free channel switching; 2000-V HBM withstands ESD events in lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V); lower drive (±24 mA); faster tpd (3.9 ns) | Requires level shifting for 5-V buses; unsuitable for mixed 5-V/3.3-V systems | Select when system runs entirely at 3.3 V and needs higher speed. |
| 74ACT244SCX | 5-V only (4.5–5.5 V); higher drive (±24 mA); higher ICC (40 µA typ) | No Ioff support; not safe for partial-power-down; higher static power | Select when Ioff is unnecessary and maximum output current is critical. |
Compared with SN74LVC244APWR and 74ACT244SCX, the SN74LV244ATNSR uniquely balances 5-V operation, Ioff safety, and TTL compatibility - making it the only choice for industrial backplanes where hot-swap reliability and legacy interface coexist.
Availability
SN74LV244ATNSR is available at Aetrix Electronics and suitable for industrial backplane bus drivers, microcontroller I/O expansion, legacy memory interfaces, test equipment signal routing, and mixed-voltage system interconnects requiring stable component supply and long-term lifecycle support.
Supply support for SN74LV244ATNSR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74LV244ATNSR belongs to TI's LV logic family - engineered for robust 5-V operation with enhanced noise immunity, low power, and backward compatibility with TTL systems in mission-critical industrial infrastructure.
FAQ
What is the maximum operating temperature for SN74LV244ATNSR?
The SN74LV244ATNSR is rated for continuous operation from –40°C to +85°C ambient temperature. This extended industrial temperature range is validated per JEDEC JESD78 and ensures reliable performance in factory automation controllers, motor drives, and outdoor communication equipment where thermal cycling and sustained high-temperature operation occur. The SOP-20 package's θJA of 60°C/W supports this rating under standard PCB copper pour conditions.
Does SN74LV244ATNSR support hot-swap insertion into a live 5-V bus?
Yes, SN74LV244ATNSR supports hot-swap via its Ioff circuitry: when VCC = 0 V, Ioff leakage remains below 5 µA even with inputs biased at 0–5.5 V, preventing damaging back-current flow. To ensure safe insertion, tie 1OE and 2OE to VCC through ≥10-kΩ pull-up resistors before power application - this forces outputs into high-Z state during power ramp-up, eliminating bus contention. This behavior is verified per JESD78 latch-up testing (>250 mA).
Can SN74LV244ATNSR interface directly between a 3.3-V microcontroller and a 5-V peripheral?
Yes, SN74LV244ATNSR supports mixed-mode voltage operation: its inputs accept 0–5.5 V regardless of VCC (set to 5 V), so 3.3-V logic levels from a microcontroller meet VIH = 2 V and VIL = 0.8 V thresholds with margin. Outputs swing rail-to-rail (0 V to 5 V), driving 5-V peripherals directly. No level shifter is needed - confirmed by TI's SCES572C datasheet Section 7.3 and Electrical Characteristics Table.
What is the recommended pull-up resistor value for OE pins on SN74LV244ATNSR?
Texas Instruments recommends tying 1OE and 2OE to VCC through a pull-up resistor to guarantee high-impedance state during power-up. The minimum value is determined by the driver's current-sinking capability: for SN74LV244ATNSR, a 10-kΩ resistor ensures OE remains above VIH (2 V) while sinking <100 µA - well within the device's specified II input current limit (±1 µA). A 4.7-kΩ to 10-kΩ range provides optimal noise immunity and rise-time balance per TI application note SCBA004.
How does SN74LV244ATNSR differ from SN74LV244A in terms of electrical performance?
The SN74LV244ATNSR is the tape-and-reel production version of the SN74LV244A family - identical electrically and functionally. "T" denotes enhanced manufacturing process (tighter parameter distributions), and "NSR" specifies SOP-20 packaging with 2000-unit reels. All key specs - tpd = 5.4 ns, Ioff < 5 µA, VOH = 3.8 V at –16 mA - match the base SN74LV244A datasheet (SCES572C). No performance trade-offs exist between variants; only packaging and logistics differ.
SN74LV244ATNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LV244ATNSR FAQ
1.How can I place an order for SN74LV244ATNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATNSR 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 SN74LV244ATNSR reliable?
The price and inventory of SN74LV244ATNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATNSR is usually 5 days.
3.What payment methods are accepted for SN74LV244ATNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244ATNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244ATNSR?
SN74LV244ATNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATNSR 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 SN74LV244ATNSR?
For technical support, including SN74LV244ATNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATNSR requirements.
6.How does Aetrix verify that SN74LV244ATNSR is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATNSR 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 SN74LV244ATNSR meets industry standards.
7.What is the process for return or replacement of SN74LV244ATNSR?
All SN74LV244ATNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATNSR, 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 SN74LV244ATNSR part is unused and in its original packaging.
Return procedure for SN74LV244ATNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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