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Texas Instruments SN74LV244ATDW
- Part No.:
- SN74LV244ATDW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LV244ATDW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,639
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Product details
Overview
SN74LV244ATDW from Texas Instruments is an octal noninverting 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, delivers typical propagation delay of 5.4 ns at 5 V, supports TTL-voltage-compatible inputs, and features Ioff partial-power-down protection. Used in industrial control backplanes and embedded data buses.
For engineers reviewing the SN74LV244ATDW datasheet, SN74LV244ATDW pinout, SN74LV244ATDW application, or SN74LV244ATDW equivalent, key selection criteria include 3-state output timing (tPLZ/tPHZ ≤ 8 ns), ±16 mA drive capability, SOIC-20 package compatibility, and Ioff-enabled system-level power sequencing.
Technical Context
This device integrates two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control - 1OE for Y1–Y4 and 2OE for Y5–Y8. Inputs accept TTL-level signals (VIL = 0.8 V, VIH = 2 V) across the full 4.5–5.5 V VCC range.
Each output drives up to ±16 mA while maintaining VOL ≤ 0.55 V and VOH ≥ 3.8 V at VCC = 4.5 V. The Ioff circuit disables all outputs when VCC = 0 V, preventing current backflow during partial power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5 V supply rails with ±10% tolerance. |
| Propagation Delay (tpd) | 5.4 ns typical at 5 V - enables high-speed bus buffering in sub-10 ns timing-critical paths. |
| Output Drive (IOL/IOH) | ±16 mA - sufficient to drive 50 pF loads with clean edges in multi-drop bus configurations. |
| 3-State Enable/Disable Time | tPHZ/tPLZ ≤ 8 ns at CL = 50 pF - minimizes bus contention window during output state transitions. |
| Ioff Current | ≤ 5 µA at VCC = 0 V - prevents damaging back-current flow when powered down in mixed-voltage systems. |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - interoperable with legacy 5 V logic without level-shifting. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements. |
Pinout & Package
SN74LV244ATDW uses a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for first and second 4-bit buffer sections - tie high via pullup for safe power-up high-Z. |
| 2, 4, 6, 8, 13, 15, 17, 19 | 1A1–1A4, 2A1–2A4 | Noninverting input terminals - accept TTL-compatible signals; unused inputs must be tied to VCC or GND. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - present high-impedance state when corresponding OE is high. |
| 10, 20 | GND, VCC | Power reference and supply pins - decoupling capacitor (0.1 µF) required near Pin 20 for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Supports interfacing between 3.3 V and 5 V domains on same bus - inputs tolerate 0–5.5 V regardless of VCC. |
| Low ground bounce (VOLP) | <0.8 V at VCC = 5 V - reduces switching noise coupling into shared ground planes. |
| Controlled undershoot (VOHV) | >2.3 V at VCC = 5 V - maintains signal integrity during fast low-to-high transitions. |
| Latch-up immunity | >250 mA per JESD 17 - eliminates risk of destructive latch-up under transient overvoltage conditions. |
| Thermal performance | θJA = 58 °C/W (SOIC-DW) - enables reliable operation at 85°C ambient with moderate power dissipation. |
Applications
| Industrial PLC Backplane | Embedded Microcontroller Bus |
|---|---|
Use Scenario: Isolating address/data lines between CPU and peripheral modules in modular control cabinets. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed access to shared memory and I/O expansion slots. Use Value: Enables deterministic bus arbitration with tPHZ/tPLZ ≤ 8 ns, reducing inter-module contention latency. |
Use Scenario: Driving parallel LCD interface signals (DATA[7:0], RS, RW, E) from an MCU GPIO bank. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for 5 V tolerant display control signals. Use Value: Delivers ±16 mA drive strength to meet LCD module setup/hold timing while tolerating 0–5.5 V input swing. |
| Legacy ISA Bus Repeater | Test Equipment Signal Conditioning |
Use Scenario: Extending signal integrity across long ISA bus traces in automated test fixtures. IC Role / Device Role / Timing Role: Noninverting repeater with controlled edge rates (20 ns/V) to suppress reflections. Use Value: Maintains signal fidelity over 15 cm traces at 8 MHz due to low tpd (5.4 ns) and low Cpd (8 pF). |
Use Scenario: Enabling/disabling analog multiplexer control lines during automated calibration sequences. IC Role / Device Role / Timing Role: 3-state gate for synchronized routing of configuration signals to multiple DUT interfaces. Use Value: Ioff protection prevents backfeed into unpowered DUT sections during hot-swap calibration steps. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), higher speed (tpd = 3.9 ns), no TTL input compatibility. | Requires 3.3 V system design; unsuitable for mixed 5 V/TTL environments. | Select when operating exclusively at 3.3 V and needing faster propagation with lower power. |
| 74ACT244SCX | Higher drive (±24 mA), wider VCC (4.5–5.5 V), but no Ioff or mixed-voltage support. | Lacks partial-power-down safety - not suitable for hot-plug or multi-rail systems. | Choose only for legacy 5 V-only designs where maximum drive strength outweighs power sequencing needs. |
Compared with SN74LV244ATDW, SN74LVC244APWR offers better speed and lower voltage operation but sacrifices TTL compatibility, while 74ACT244SCX provides stronger drive yet omits Ioff - making SN74LV244ATDW the optimal choice for robust 5 V bus isolation with safe power-down behavior.
Availability
SN74LV244ATDW is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller buses, and legacy ISA bus repeaters requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for SN74LV244ATDW 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 decades of innovation in industrial, automotive, and communications markets.
The SN74LV244ATDW belongs to TI's LV-A family of low-voltage, TTL-compatible logic devices engineered for reliable 5 V bus interfacing, power-aware system design, and industrial-grade ESD/latch-up robustness.
FAQ
What is the recommended power-up sequence for SN74LV244ATDW?
TI specifies that OE pins must be held high (via pullup resistor to VCC) during power-up to ensure outputs remain in high-impedance state until system initialization completes. For SN74LV244ATDW, a 10 kΩ pullup on Pins 1 and 19 to VCC is typical. This prevents bus contention before firmware configures downstream logic. The Ioff feature further protects against back-current if VCC ramps after other rails.
Does SN74LV244ATDW support hot-swap insertion in live backplanes?
Yes - SN74LV244ATDW supports hot-swap via its Ioff circuitry, which disables outputs and limits off-state leakage to ≤5 µA when VCC = 0 V. This prevents current backflow from live bus lines into the unpowered device. However, external series resistors (e.g., 10–22 Ω) on A/Y lines are still recommended to limit inrush during connector mating.
Can SN74LV244ATDW interface directly between 3.3 V and 5 V logic domains?
Yes - SN74LV244ATDW supports mixed-mode operation: inputs tolerate 0–5.5 V regardless of VCC (set to 5 V), and outputs swing rail-to-rail (0 V to 5 V). When driving a 3.3 V receiver, the VOH minimum of 3.8 V at 4.5 V VCC exceeds the 3.3 V system's VIH requirement, enabling direct connection without level shifters.
What is the maximum capacitive load SN74LV244ATDW can drive reliably?
SN74LV244ATDW is characterized up to 50 pF load capacitance, with tPLH/tPHL = 5.9 ns and tPZH/tPLZ = 8.2 ns at VCC = 5 V. Driving >50 pF increases propagation delay nonlinearly and may cause ringing; for 100 pF loads, TI recommends adding series termination (22–33 Ω) near the driver output and verifying signal integrity with oscilloscope validation on the SN74LV244ATDW output node.
How does SN74LV244ATDW differ from the standard SN74LV244A?
SN74LV244ATDW is the tape-and-reel packaged version (2000-unit reel) of the SN74LV244A logic device, using SOIC-20 (DW) packaging. The "T" suffix denotes enhanced temperature range (–40°C to 85°C), and "DW" specifies the package type. Electrically and functionally identical to SN74LV244A, SN74LV244ATDW is optimized for automated SMT assembly with JEDEC-standard reel dimensions and moisture sensitivity level (MSL) 1 rating.
SN74LV244ATDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
SN74LV244ATDW FAQ
1.How can I place an order for SN74LV244ATDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ATDW 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 SN74LV244ATDW reliable?
The price and inventory of SN74LV244ATDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ATDW is usually 5 days.
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4.How is shipping managed for SN74LV244ATDW?
SN74LV244ATDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ATDW 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 SN74LV244ATDW?
For technical support, including SN74LV244ATDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ATDW requirements.
6.How does Aetrix verify that SN74LV244ATDW is sourced from the original manufacturer or authorized distributors?
All SN74LV244ATDW 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 SN74LV244ATDW meets industry standards.
7.What is the process for return or replacement of SN74LV244ATDW?
All SN74LV244ATDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ATDW, 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 SN74LV244ATDW part is unused and in its original packaging.
Return procedure for SN74LV244ATDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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