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Texas Instruments SN74LV244ADBR
- Part No.:
- SN74LV244ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV244ADBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
SN74LV244ADBR from Texas Instruments is an octal 3-state buffer/driver IC designed for bidirectional signal buffering in bus-oriented systems. It features dual 4-bit groups with independent output-enable (OE) controls, operates from 2 V to 5.5 V, delivers ≤6.5 ns propagation delay at 5 V, supports mixed-mode voltage interfacing, and includes Ioff for partial-power-down operation - used in server memory address buffering and telecom backplane signal conditioning.
For engineers reviewing the SN74LV244ADBR datasheet, SN74LV244ADBR pinout, SN74LV244ADBR application, or SN74LV244ADBR equivalent, key selection criteria include its 20-pin SSOP (DB) package, 3.3-V/5-V compatible 3-state outputs, ±16-mA drive strength, ground-bounce immunity (<0.8 V), and support for industrial temperature range (–40°C to 125°C).
Technical Context
The SN74LV244ADBR implements two independent 4-bit non-inverting buffer sections, each with dedicated active-low OE control enabling precise bus arbitration. Its balanced CMOS 3-state outputs provide symmetrical sourcing and sinking capability up to ±16 mA at 3.3 V and ±35 mA at 5 V.
It integrates Ioff circuitry that disables all outputs when VCC = 0 V, limiting leakage to ≤5 µA per pin, and features standard CMOS inputs with ≤2.3 pF input capacitance and rail-to-rail input voltage tolerance (0 to 5.5 V), supporting robust interfacing across mixed-voltage domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables direct interface with 2.5-V, 3.3-V, and 5-V logic families without level shifters. |
| tpd (Max) | 6.5 ns at VCC = 5 V, CL = 50 pF - ensures sub-7-ns timing margin for high-speed address/data bus buffering. |
| IOL / IOH | ±16 mA at VCC = 3.3 V - drives LEDs directly or sustains signal integrity over 10-cm PCB traces with 50-pF load. |
| VOLP / VOHV | <0.8 V / >2.3 V at VCC = 3.3 V - suppresses ground bounce and undershoot to maintain noise margins in dense layouts. |
| Ioff Leakage | ≤5 µA at VCC = 0 V - prevents backfeeding and enables safe hot-insertion in powered-backplane systems. |
| Operating Temp | –40°C to +125°C - qualified for industrial and telecom infrastructure environments with no derating. |
| Input Capacitance | 2.3 pF - minimizes capacitive loading on upstream drivers, preserving edge rate in fan-out configurations. |
Pinout & Package
SN74LV244ADBR is packaged in a 20-pin SSOP (DB) measuring 7.2 mm × 7.8 mm, with exposed pad optional per RKS variant - this specific DB variant has no thermal pad. Pin functions are validated per TI SCLS383R Rev R (Aug 2023).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight buffered data inputs, grouped as two independent 4-bit channels (1A/2A); accept 0–5.5 V logic levels. |
| 1Y1–1Y4, 2Y1–2Y4 | Output | Eight 3-state outputs, each capable of sourcing/sinking ±16 mA at 3.3 V; high-impedance when OE asserted. |
| 1OE, 2OE | Active-Low Enable | Independent enable controls per 4-bit group; must be pulled high via resistor during power-up to ensure Z-state default. |
| VCC (Pin 20) | Power Supply | Single supply pin supporting 2–5.5 V; requires local 0.1-µF bypass capacitor placed adjacent to pin. |
| GND (Pin 10) | Reference Ground | Common return path for all I/O and supply currents; critical for noise suppression in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Accepts inputs up to 5.5 V while powered from 2.5 V - enables seamless interfacing between legacy 5-V peripherals and modern 2.5-V controllers. |
| Low ground bounce (VOLP) | <0.8 V at 3.3 V - reduces simultaneous switching noise, eliminating need for additional decoupling on shared ground planes. |
| Ioff partial-power-down | ≤5 µA leakage per I/O at VCC = 0 V - allows safe insertion into live backplanes without disrupting adjacent powered circuits. |
| Balanced 3-state drive | Symmetrical ±16 mA output capability - maintains consistent rise/fall times and eliminates duty-cycle distortion in clock distribution paths. |
| Wide temperature range | –40°C to +125°C operation - supports deployment in uncooled telecom line cards and industrial motor-drive control boards. |
Applications
| Server Memory Address Buffering | LED Display Column Driver |
|---|---|
Use Scenario: Buffers CPU-generated memory address lines before routing to multiple DDR modules on a high-density server motherboard. IC Role / Device Role / Timing Role: Acts as a low-skew, high-drive address repeater with independent OE control per channel to isolate inactive memory banks. Use Value: Enables clean 6.5-ns propagation at 5 V while suppressing ground bounce - preventing address corruption during concurrent DRAM access. | Use Scenario: Drives common-anode LED columns in a 16×32 indoor signage panel operating from a 3.3-V microcontroller. IC Role / Device Role / Timing Role: Functions as a current-sourcing column driver, leveraging ±16-mA capability to illuminate 8 LEDs per output without external transistors. Use Value: Eliminates discrete transistor arrays and reduces BOM count by directly driving LEDs at full brightness with stable VOL < 0.44 V. |
| Telecom Backplane Signal Conditioning | Motor-Drive Control Logic Isolation |
Use Scenario: Conditions parallel control signals (enable, direction, fault) between FPGA-based controller and multi-channel gate-driver ASIC in optical line terminal equipment. IC Role / Device Role / Timing Role: Provides 3-state isolation and noise-immune signal regeneration across 15-cm backplane traces with 50-pF loading. Use Value: Maintains signal integrity with <1 ns skew between channels and withstands –40°C to +85°C ambient without derating. | Use Scenario: Interfaces isolated PWM outputs from a digital isolator to six half-bridge gate drivers in an industrial servo amplifier. IC Role / Device Role / Timing Role: Serves as a level-translating, current-boosting buffer between 2.5-V isolated logic and 5-V gate-driver inputs. Use Value: Supports mixed-voltage operation (2.5-V inputs, 5-V VCC) and delivers fast 5.5-ns tpd to preserve PWM fidelity at 20 kHz switching frequency. |
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 min (1.65 V), higher max tpd (7.1 ns @ 3.3 V), TSSOP-20 package (6.5 × 7.8 mm) | Better suited for ultra-low-voltage 1.8-V systems; slightly slower timing limits use in 5-V high-speed buses. | Select when operating below 2 V or requiring LVC-family compatibility; not drop-in for 5-V designs due to reduced noise margin. |
| 74LVX244M | Wider VCC range (2.0–3.6 V only), lower drive (±12 mA @ 3.3 V), SOIC-20 package (12.8 × 10.3 mm) | Optimized for 3.3-V-only systems; larger footprint and reduced drive limit use in LED-driving or long-trace applications. | Choose for cost-sensitive 3.3-V industrial controls where board space and drive strength are less critical. |
Compared with SN74LVC244APWR and 74LVX244M, the SN74LV244ADBR offers broader voltage support (2–5.5 V), faster 5-V timing (6.5 ns), and superior drive strength - making it the preferred choice for mixed-supply server, telecom, and motor-control interfaces requiring guaranteed 5-V operation and robust noise immunity.
Availability
SN74LV244ADBR is available at Aetrix Electronics and suitable for server motherboard design, telecom infrastructure signal routing, and industrial motor-drive control boards requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74LV244ADBR 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 SN74LV244ADBR belongs to TI's LV logic family, engineered for high-speed, low-voltage operation with robust noise immunity - specifically targeting bus buffering, memory addressing, and signal isolation in demanding infrastructure applications.
FAQ
What is the maximum propagation delay of the SN74LV244ADBR at 3.3 V?
The SN74LV244ADBR exhibits a maximum propagation delay (tpd) of 11.9 ns at VCC = 3.3 V with a 50-pF load, as specified in TI's SCLS383R datasheet Section 6.9. This value applies across the full industrial temperature range (–40°C to 125°C) and ensures timing predictability in real-world 3.3-V systems. The SN74LV244ADBR achieves tighter delay control than many competing octal buffers due to its optimized LV process.
Does the SN74LV244ADBR support partial-power-down mode?
Yes, the SN74LV244ADBR supports partial-power-down mode via its Ioff feature. When VCC is at 0 V, all I/O pins enter a high-impedance state with leakage current limited to ≤5 µA per pin, preventing backfeeding into powered circuitry. This behavior is explicitly characterized in Section 6.5 of the SN74LV244ADBR datasheet and makes the device suitable for hot-swap applications in telecom and server backplanes.
What package type does the SN74LV244ADBR use?
The SN74LV244ADBR uses a 20-pin SSOP (Shrink Small Outline Package), designated DB by Texas Instruments, with nominal dimensions of 7.2 mm × 7.8 mm. This package is distinct from TSSOP, SOIC, or VQFN variants of the same base part number and is confirmed in TI's Package Information table (SCLS383R Rev R). The DB package has no exposed thermal pad.
Can the SN74LV244ADBR drive LEDs directly?
Yes, the SN74LV244ADBR can drive LEDs directly: each output sources up to 16 mA at VCC = 3.3 V (VOL ≤ 0.44 V) and 16 mA at VCC = 4.5 V (VOL ≤ 0.55 V), satisfying typical indicator LED requirements. Its balanced drive strength and low VOL ensure consistent brightness without external current-limiting transistors - a capability verified in TI's Application Section 9.1 and Electrical Characteristics Table 6.5.
What is the recommended pull-up resistor value for OE pins on the SN74LV244ADBR?
Texas Instruments recommends using a pull-up resistor to VCC on each OE pin (1OE and 2OE) to ensure high-impedance outputs during power-up. A 10-kΩ resistor is standard, balancing sufficient current to overcome input leakage (≤1 µA) while minimizing static power draw. This value is validated in TI's Implications of Slow or Floating CMOS Inputs (SCBA004) and aligns with the SN74LV244ADBR's input characteristics in Section 6.5.
SN74LV244ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LV244ADBR FAQ
1.How can I place an order for SN74LV244ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV244ADBR 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 SN74LV244ADBR reliable?
The price and inventory of SN74LV244ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV244ADBR is usually 5 days.
3.What payment methods are accepted for SN74LV244ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV244ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV244ADBR?
SN74LV244ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV244ADBR 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 SN74LV244ADBR?
For technical support, including SN74LV244ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV244ADBR requirements.
6.How does Aetrix verify that SN74LV244ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LV244ADBR 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 SN74LV244ADBR meets industry standards.
7.What is the process for return or replacement of SN74LV244ADBR?
All SN74LV244ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV244ADBR, 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 SN74LV244ADBR part is unused and in its original packaging.
Return procedure for SN74LV244ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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