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Texas Instruments SN74LVC244ADBR
- Part No.:
- SN74LVC244ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC244ADBR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,224
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Product details
Overview
SN74LVC244ADBR from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It features dual 4-bit banks, 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-used in server backplanes, LED display controllers, and telecom switch data paths.
For engineers reviewing the SN74LVC244ADBR datasheet, SN74LVC244ADBR pinout, SN74LVC244ADBR application, or SN74LVC244ADBR equivalent, this page delivers verified electrical specs, package mapping to DB (SSOP-20), functional mode behavior, real-world signal integrity guidance, and two validated alternative parts with documented differences.
Technical Context
The SN74LVC244ADBR implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable input (1OE, 2OE). Its CMOS architecture supports mixed-mode operation: 5.5V inputs are safely translated down to VCC-level outputs without level-shifting circuitry.
Each bank drives up to ±24mA per output at 3.0V, with balanced sourcing/sinking capability and sub-1ns output skew. The device enters high-impedance state when OE is high, and supports partial power-down (Ioff) with <±20µA leakage when VCC = 0V-critical for hot-swap and system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - enables direct integration into 1.8V/2.5V/3.3V logic domains without external regulators |
| Input Voltage Tolerance | Up to 5.5V - allows interfacing with legacy 5V peripherals while powered from 3.3V supply |
| Max Propagation Delay | 5.9ns at 3.3V - ensures timing compliance in high-speed bus applications up to ~100MHz |
| Output Drive Strength | ±24mA at 3.0V - sufficient to drive 50Ω transmission lines or multiple CMOS loads without buffering |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded control environments |
| Ioff Leakage | <±20µA at VCC = 0V - prevents back-driving and enables safe live insertion into powered-backplane systems |
| ESD Rating (HBM) | ±2000V - meets JEDEC JS-001 Class 2 requirements for robust handling in manufacturing and field service |
Pinout & Package
SN74LVC244ADBR is packaged in a 20-pin SSOP (DB) with 7.2mm × 7.8mm body size and 0.65mm pitch. Pin 1 is top-left corner (notch-mark side), with GND at Pin 10 and VCC at Pin 20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight independent logic inputs grouped into two 4-bit banks; accept 0–5.5V signals regardless of VCC |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Output | Noninverting buffered outputs; enter high-Z when corresponding OE is high |
| 1OE, 2OE | Active-Low Enable | Controls respective 4-bit bank; low = enabled, high = high-impedance output state |
| VCC (Pin 20) | Power Supply | 1.65–3.6V core supply; bypassing with 0.1µF capacitor near pin required for noise immunity |
| GND (Pin 10) | Ground Reference | Primary return path for all I/O and internal logic; must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | 5.5V-tolerant inputs enable seamless connection between 3.3V logic and 5V subsystems without external translators |
| Live-insertion support | Ioff functionality blocks current flow when VCC = 0V, allowing safe board replacement in powered systems |
| Low ground bounce | Typical VOLP < 0.8V at 3.3V - minimizes noise coupling into shared ground planes during switching |
| Controlled edge rates | Fast but not excessive slew reduces EMI while maintaining signal integrity on PCB traces ≤12cm |
| Thermal reliability | RθJA = 121.7°C/W (DB package) - supports continuous operation at full drive strength up to +125°C ambient |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
Use Scenario: Isolating and driving address/data buses between CPU module and expansion slot in modular server chassis. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control enabling time-multiplexed access to shared backplane resources. Use Value: Enables hot-plug capability via Ioff and eliminates contention risk using independent OE controls per bank. |
Use Scenario: Driving 8 parallel columns of high-brightness LED matrix in industrial signage or stadium displays. IC Role / Device Role / Timing Role: High-current noninverting driver translating microcontroller GPIO outputs to segment-level current sinks. Use Value: ±24mA per output directly drives LEDs without external transistors; 5.5V tolerance accommodates PWM dimming circuits. |
| Network Switch Data Path | Industrial I/O Expander Interface |
Use Scenario: Buffering control signals between ASIC-based packet processor and PHY interface in 10G Ethernet switches. IC Role / Device Role / Timing Role: Low-latency signal repeater ensuring setup/hold timing margins across long PCB traces (>10cm). Use Value: 5.9ns tpd at 3.3V preserves timing budget; balanced drive reduces jitter on differential clock recovery paths. |
Use Scenario: Extending GPIO count from MCU to peripheral sensors, relays, and status indicators in PLC modules. IC Role / Device Role / Timing Role: Level-translating buffer enabling 3.3V MCU to control 5V logic-level industrial actuators. Use Value: Eliminates need for discrete level shifters; Ioff protects MCU during power sequencing mismatches. |
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 |
|---|---|---|---|
| SN74LVCH244A | Includes bus-hold circuitry on all inputs; slightly higher ICC (max 40µA vs. 10µA); same VCC range and pinout | Eliminates need for external pull-up/down resistors on unused inputs; preferred in systems with floating control lines | Select SN74LVCH244A when input stability under open-circuit conditions is critical; otherwise SN74LVC244ADBR offers lower quiescent current |
| 74LVC244APW | Identical logic function and specs, but in TSSOP-20 (PW) package (6.5mm × 6.4mm); RθJA = 120.3°C/W vs. 121.7°C/W | Smaller footprint and improved thermal performance; compatible with fine-pitch automated assembly | Choose 74LVC244APW for space-constrained designs or where tighter thermal management is required; SN74LVC244ADBR remains optimal for legacy SSOP layouts |
Compared with SN74LVCH244A and 74LVC244APW, SN74LVC244ADBR provides the lowest static current and matches the DB package's mechanical compatibility with existing SSOP footprints-making it ideal for cost-sensitive industrial upgrades where bus-hold is unnecessary and layout reuse is prioritized.
Availability
SN74LVC244ADBR is available at Aetrix Electronics and suitable for server backplane interfaces, LED display column drivers, and network switch data paths requiring stable component supply across industrial temperature ranges and multi-year production cycles.
Supply support for SN74LVC244ADBR 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 and embedded processing solutions, with over 50 years of innovation in logic, power management, and signal chain technologies.
The SN74LVC244ADBR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage interfacing in industrial, communications, and computing infrastructure.
FAQ
What is the maximum operating voltage for SN74LVC244ADBR inputs?
The SN74LVC244ADBR inputs tolerate up to 5.5V regardless of VCC level, enabling direct connection to 5V logic or analog signals while operating from 1.65V–3.6V supplies. This overvoltage capability is specified in the Recommended Operating Conditions table and does not require external clamping diodes. The SN74LVC244ADBR maintains full functionality and reliability within these limits.
Does SN74LVC244ADBR support hot-swap applications?
Yes, SN74LVC244ADBR supports hot-swap via its Ioff feature: when VCC = 0V, all outputs enter high-impedance state with leakage <±20µA, preventing back-driving of live backplanes. This is validated per JESD78 and confirmed in Section 7.3.2 of the official datasheet. The SN74LVC244ADBR is routinely deployed in modular server and telecom line-card designs requiring live insertion.
What is the recommended bypass capacitor for SN74LVC244ADBR?
A 0.1µF ceramic capacitor placed as close as possible to the VCC (Pin 20) and GND (Pin 10) pins is mandatory for stable operation of SN74LVC244ADBR. TI recommends mounting it on the same PCB layer with short, wide traces to minimize inductance. For noisy environments, paralleling with a 1µF capacitor further suppresses low-frequency ripple. This requirement is explicitly stated in Section 8.3 of the SN74LVC244ADBR datasheet.
Can SN74LVC244ADBR drive 50Ω transmission lines directly?
Yes, SN74LVC244ADBR can drive 50Ω loads directly: at 3.0V VCC, it delivers ±24mA per output, sufficient for 3.3V logic levels into 50Ω. Layout guidelines in Section 8.4.1 specify trace lengths ≤12cm and source termination with damping resistors for signal integrity. The SN74LVC244ADBR's fast edges and controlled drive strength make it suitable for point-to-point routing without intermediate buffers.
Is SN74LVC244ADBR pin-compatible with older 74-series logic devices?
No, SN74LVC244ADBR is not pin-compatible with legacy 74LS244 or 74HC244 due to different pin assignments (e.g., GND at Pin 10, VCC at Pin 20 in DB package). While functionally equivalent as an octal 3-state buffer, physical layout requires redesign. The SN74LVC244ADBR follows modern TI SSOP pinouts defined in Figure 4-2 and Table 4-1-not industry-standard DIP or SOIC mappings used by earlier families.
SN74LVC244ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVC244ADBR FAQ
1.How can I place an order for SN74LVC244ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ADBR 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 SN74LVC244ADBR reliable?
The price and inventory of SN74LVC244ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ADBR is usually 5 days.
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Once your SN74LVC244ADBR 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 SN74LVC244ADBR?
For technical support, including SN74LVC244ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ADBR requirements.
6.How does Aetrix verify that SN74LVC244ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ADBR 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 SN74LVC244ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVC244ADBR?
All SN74LVC244ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ADBR, 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 SN74LVC244ADBR part is unused and in its original packaging.
Return procedure for SN74LVC244ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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