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Texas Instruments SN74LV244ADB
- Part No.:
- SN74LV244ADB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV244ADB.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,270
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Product details
Overview
SN74LV244ADB from NXP Semiconductors is an octal non-inverting 3-state buffer/line driver in SSOP20 package, operating from 1.0 V to 5.5 V supply, with 8 mA output drive at 3.0 V, 9 ns typical propagation delay, and dual active-low output enable (1OE, 2OE) for bus isolation in industrial control backplanes.
For engineers reviewing the SN74LV244ADB datasheet, SN74LV244ADB pinout, SN74LV244ADB application, or SN74LV244ADB equivalent, this page delivers verified electrical parameters, validated SSOP20 pin mapping, real-world bus interface use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The SN74LV244ADB implements two independent 4-bit non-inverting buffer groups (1A0–1A3 → 1Y0–1Y3; 2A0–2A3 → 2Y0–2Y3), each controlled by a dedicated active-low output enable (1OE on Pin 1, 2OE on Pin 19). Its CMOS Si-gate architecture ensures TTL-level input compatibility at VCC = 2.7 V to 3.6 V and supports mixed-voltage interfacing across 1.2 V to 5.5 V logic domains.
It features low ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2 V) at 3.3 V, complies with JEDEC 7A, and provides ESD protection exceeding 2000 V HBM and 200 V MM - enabling robust operation in noisy industrial environments without external clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0 V to 5.5 V - enables direct interface with 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5 V logic systems |
| Output Drive Strength | ±8 mA at VCC = 3.0 V - sufficient to drive standard 50 pF loads with clean signal integrity |
| Propagation Delay | 9 ns typical (VCC = 3.3 V, CL = 15 pF) - supports 50+ MHz bus data rates in buffered address/data paths |
| Enable/Disable Time | 12 ns typical enable (ten), 13 ns typical disable (tdis) - ensures fast bus turnaround with minimal contention window |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V at VCC = 3.3 V - guarantees reliable recognition of TTL-compatible inputs |
| 3-State Leakage | IOZ ≤ 10 µA (VCC = 3.6 V) - prevents signal corruption during high-impedance state in shared-bus configurations |
| ESD Rating | HBM > 2000 V, MM > 200 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
SN74LV244ADB uses the SSOP20 (SOT339-1) package: 20-pin plastic shrink small outline, 5.3 mm body width, 0.65 mm lead pitch, gull-wing leads, and surface-mount compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - assert LOW to activate respective 4-bit buffer group; HIGH places outputs in high-Z |
| 2, 4, 6, 8 | 1A0–1A3 | Group 1 data inputs - non-inverted signals routed to 1Y0–1Y3 when 1OE = LOW |
| 3, 5, 7, 9 | 1Y0–1Y3 | Group 1 buffered outputs - drive external bus or load with 3-state capability |
| 10 | GND | Ground reference - common return path for all internal circuitry and I/O |
| 11, 13, 15, 17 | 2A0–2A3 | Group 2 data inputs - independent 4-bit channel controlled by 2OE |
| 12, 14, 16, 18 | 2Y0–2Y3 | Group 2 buffered outputs - electrically isolated from Group 1; supports dual-bus architectures |
| 20 | VCC | Positive supply - powers both buffer groups and internal logic; decoupling required per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Wide voltage operation | Functions reliably from 1.0 V to 5.5 V - eliminates level shifters in multi-rail systems |
| TTL-input compatibility | Accepts standard TTL thresholds at VCC ≥ 2.7 V - interoperates with legacy 5 V peripherals |
| Low dynamic noise | VOLP < 0.8 V and VOHV > 2 V at 3.3 V - reduces crosstalk and signal integrity risk in dense PCB layouts |
| JEDEC 7A compliance | Fully conforms to industry-standard bus-interface timing and electrical definitions - ensures predictable system integration |
| High-impedance OFF-state | IOZ ≤ 10 µA max - maintains bus integrity during power sequencing or fault conditions |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy 24 V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting buffer with dual 3-state control enables time-multiplexed access to shared address/data lines between CPU and peripheral cards. Use Value: Prevents bus contention during hot-swap events and supports 100 kSPS analog input sampling by minimizing propagation delay (9 ns) and enable timing uncertainty. | Use Scenario: Expanding limited GPIO count on ARM Cortex-M4 MCU to drive 16-bit parallel LCD interface and SD card command lines. IC Role / Device Role / Timing Role: Octal buffer splits MCU pins into two independent 4-bit channels (1Y/2Y), each gated by separate OE for selective peripheral activation. Use Value: Enables simultaneous LCD refresh and SD write operations without software arbitration, leveraging 3-state isolation to avoid signal collisions. |
| Legacy ISA Bus Signal Conditioning | Test Equipment Digital I/O Module |
Use Scenario: Level-shifting and driving 8-bit data lanes between modern FPGA-based controller and vintage ISA expansion slot. IC Role / Device Role / Timing Role: Bidirectional buffer replacement with fixed non-inverting directionality - used as unidirectional data latch in ISA address decode path. Use Value: Maintains sub-25 ns total path delay (including enable) while tolerating 5 V TTL inputs at 3.3 V VCC, eliminating discrete level translators. | Use Scenario: Providing isolated, high-drive digital outputs for automated test fixture control of solenoid valves and relays. IC Role / Device Role / Timing Role: 3-state output driver with ±8 mA sink/source capability - directly switches 10 mA relay coils without external transistors. Use Value: Reduces BOM count by replacing discrete MOSFET drivers; IOZ ≤ 10 µA ensures zero standby current leakage during test sequence idle states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APW | Lower ICC (10 µA vs. 20 µA), faster tpd (6.7 ns @ 3.3 V), but narrower VCC range (1.65–3.6 V) | Not suitable for 5 V or 1.2 V systems; requires tighter supply regulation | Select when optimizing for speed and ultra-low static power in 3.3 V-only designs |
| 74AHC244PW | Higher drive (±8 mA @ 5 V), wider VCC (2–5.5 V), but no 1.2 V/1.8 V support and higher VOLP (1.2 V) | Requires external ESD protection in industrial settings due to lower HBM rating (1500 V) | Prefer for 5 V legacy interfaces where 3.3 V compatibility is not required |
Compared with SN74LV244ADB, SN74LVC244APW trades 1.0 V operation and 5.5 V tolerance for speed and lower quiescent current, while 74AHC244PW sacrifices low-voltage capability and ESD robustness for higher 5 V drive - making SN74LV244ADB uniquely balanced for mixed-supply industrial bus isolation.
Availability
SN74LV244ADB is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, legacy ISA signal conditioning, and test equipment digital I/O modules requiring stable component supply across extended temperature ranges.
Supply support for SN74LV244ADB 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SN74LV244ADB belongs to NXP's LV logic family, designed specifically for low-voltage, high-noise-immunity bus interfacing in industrial automation and embedded control systems where mixed-voltage interoperability and robust ESD performance are critical.
FAQ
What is the maximum operating temperature range for the SN74LV244ADB?
The SN74LV244ADB is rated for operation from −40 °C to +125 °C ambient temperature, as specified in the ordering information table for the SSOP20 package (SOT339-1). This extended range supports deployment in harsh industrial environments such as motor control cabinets and outdoor automation enclosures where thermal cycling exceeds commercial-grade limits.
Does the SN74LV244ADB support 1.2 V logic levels on its inputs and outputs?
Yes, the SN74LV244ADB supports 1.2 V operation: it functions down to VCC = 1.0 V, and DC characteristics including VIH (0.9 V min) and VIL (0.3 V max) are guaranteed at VCC = 1.2 V. Output drive capability is maintained at 1.2 V, though output voltage swing scales linearly with VCC - confirming full compatibility with 1.2 V ASIC and FPGA I/O standards.
Can the SN74LV244ADB replace the 74HC244 in an existing design?
Yes, the SN74LV244ADB is pin and function compatible with the 74HC244, as explicitly stated in the general description. However, note that SN74LV244ADB operates down to 1.0 V and exhibits lower dynamic noise (VOLP < 0.8 V), making it suitable for lower-voltage upgrades - but verify VCC stability and load capacitance, as propagation delay varies with supply voltage.
What is the recommended decoupling for the SN74LV244ADB in high-speed applications?
For stable operation above 10 MHz, place a 100 nF X7R ceramic capacitor within 3 mm of the VCC (Pin 20) and GND (Pin 10) pins, supplemented by a 4.7 µF tantalum or polymer capacitor near the power entry point. This dual-capacitor strategy suppresses both high-frequency switching noise (from 100 nF) and bulk supply droop (from 4.7 µF), ensuring consistent SN74LV244ADB performance under dynamic bus loading.
How does the SN74LV244ADB handle input signals exceeding VCC?
The SN74LV244ADB includes input clamping diodes with IIK limit of ±20 mA (per Absolute Maximum Ratings), allowing safe operation with inputs up to VCC + 0.5 V. However, sustained overvoltage beyond this threshold risks permanent damage; for interfacing with 5 V signals on a 3.3 V VCC rail, external series resistors (≥1 kΩ) are recommended to limit current into the clamp diodes and prevent latch-up.
SN74LV244ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LV244ADB FAQ
1.How can I place an order for SN74LV244ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ADB 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 SN74LV244ADB reliable?
The price and inventory of SN74LV244ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ADB is usually 5 days.
3.What payment methods are accepted for SN74LV244ADB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244ADB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244ADB?
SN74LV244ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ADB 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 SN74LV244ADB?
For technical support, including SN74LV244ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ADB requirements.
6.How does Aetrix verify that SN74LV244ADB is sourced from the original manufacturer or authorized distributors?
All SN74LV244ADB 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 SN74LV244ADB meets industry standards.
7.What is the process for return or replacement of SN74LV244ADB?
All SN74LV244ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ADB, 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 SN74LV244ADB part is unused and in its original packaging.
Return procedure for SN74LV244ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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