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Texas Instruments SN74LVC244ANSR
- Part No.:
- SN74LVC244ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC244ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,609
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Product details
Overview
SN74LVC244ANSR from Texas Instruments is an octal 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 and LED display data routing.
For engineers reviewing the SN74LVC244ANSR datasheet, SN74LVC244ANSR pinout, SN74LVC244ANSR application, or SN74LVC244ANSR equivalent, key selection criteria include VCC operating range (1.65–3.6V), 3-state output control per bank, mixed-mode voltage translation capability, and thermal performance in the 20-pin SSOP package.
Technical Context
The SN74LVC244ANSR implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable input (1OE, 2OE). Its CMOS architecture delivers balanced sourcing/sinking drive (±24mA at 3V) with rail-to-rail output swing and low ground bounce (<0.8V typical at VCC=3.3V).
It supports partial-power-down via Ioff, enabling safe operation during VCC ramp-up/down, and accepts 5.5V inputs regardless of VCC-enabling direct interfacing between 5V peripherals and 3.3V system controllers without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables use in modern low-voltage digital systems including battery-powered and mixed-supply designs. |
| Input Voltage Tolerance | Up to 5.5V - Allows direct connection to legacy 5V logic without external translators or clamping. |
| Max Propagation Delay | 5.9ns at 3.3V - Supports high-speed data transfer across PCB traces up to ~12cm without signal integrity degradation. |
| Output Drive Strength | ±24mA at VCC = 3V - Sufficient to drive multiple CMOS loads or moderate capacitive traces without buffering. |
| Ioff Current | ±10µA max at VCC = 0V - Ensures isolation and prevents back-drive during hot-swap or partial power-down. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and telecom infrastructure environments with extended thermal margins. |
| ESD Rating (HBM) | ±2000V - Meets standard handling requirements for automated assembly and field deployment. |
Pinout & Package
The SN74LVC244ANSR is supplied in a 20-pin SSOP (NS) package measuring 12.60mm × 7.8mm body size, with gull-wing leads optimized for surface-mount reflow and optical inspection.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight independent data inputs grouped into two 4-bit banks; each bank driven by its own OE pin. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Output | Noninverting buffered outputs; high-impedance when corresponding OE is high. |
| 1OE, 2OE | Active-Low Enable | Controls 3-state behavior per bank; low enables outputs, high disables them to Z-state. |
| VCC | Power Supply | Single supply pin for 1.65–3.6V operation; requires local 0.1µF bypass capacitor. |
| GND | Ground Reference | Common return path for all signals and power; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V-tolerant inputs with 3.3V VCC enable seamless interface between legacy and modern logic families. |
| Ioff partial-power-down protection | Prevents current backflow and ensures isolation when VCC = 0V-critical for hot-plug and modular systems. |
| Balanced CMOS 3-state outputs | Matched sourcing/sinking capability (±24mA) minimizes skew and improves signal integrity on shared buses. |
| Low ground bounce (VOLP) | <0.8V typical at 3.3V - Reduces noise coupling into adjacent signals and power rails during switching. |
| Ultra-fast enable/disable timing | 7.6ns max tdis and 9.4ns max ten at 3.3V - Enables precise bus arbitration and dynamic load management. |
Applications
| Server Backplane Interface | LED Display Data Routing |
|---|---|
Use Scenario: Driving parallel address/data lines between CPU modules and expansion slots in rack-mounted servers. IC Role / Device Role / Timing Role: Octal buffer isolating and strengthening control signals across long PCB traces with minimal skew. Use Value: 5.9ns propagation delay and ±24mA drive ensure reliable timing margin for 100MHz+ parallel bus operation. |
Use Scenario: Distributing column/row scan data to high-density LED matrix panels in outdoor signage. IC Role / Device Role / Timing Role: Level-translating and fan-out buffer for microcontroller GPIOs driving multiplexed LED drivers. Use Value: 5.5V input tolerance allows direct connection to 5V LED driver ICs while powered from 3.3V MCU rails. |
| Network Switch Control Plane | Industrial I/O Expander Interface |
Use Scenario: Isolating management interface signals (I²C, SPI, GPIO) between baseboard controller and line cards. IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling hot-swap-safe communication with Ioff-enabled isolation. Use Value: Ioff specification (±10µA at VCC=0V) guarantees no back-drive during card insertion/removal under power. |
Use Scenario: Extending microcontroller GPIO count to drive relays, sensors, and status indicators in PLC modules. IC Role / Device Role / Timing Role: 3-state output buffer allowing shared bus access among multiple I/O expanders. Use Value: Dual independent OE pins permit time-multiplexed control of two 4-bit peripheral groups without contention. |
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; otherwise identical VCC range, drive strength, and pinout. | Eliminates need for external pull-up/pull-down resistors on unused or floating inputs. | Preferred where input signal integrity is uncertain or board space for termination resistors is constrained. |
| 74LVC244APW | Same electrical specs but in 20-pin TSSOP (PW) package; 6.50mm × 6.4mm footprint vs. NS's 12.60mm × 7.8mm. | Higher pin density and improved thermal resistance (RθJA = 120.3°C/W vs. NS's 116.3°C/W). | Recommended for space-constrained designs requiring better thermal performance and automated assembly compatibility. |
Compared with SN74LVC244ANSR, SN74LVCH244A adds bus-hold for robustness against floating inputs, while 74LVC244APW offers smaller footprint and lower thermal resistance-both retain full functional and timing equivalence for drop-in replacement in most 3.3V bus interface roles.
Availability
SN74LVC244ANSR is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and network switch control planes requiring stable component supply, long-term lifecycle assurance, and traceable industrial-grade sourcing.
Supply support for SN74LVC244ANSR 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 90 years of innovation in logic, power, and signal chain technologies.
The SN74LVC244ANSR 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 temperature for SN74LVC244ANSR?
The SN74LVC244ANSR is rated for operation from –40°C to +125°C ambient temperature, making it suitable for industrial and telecom environments. This rating applies specifically to the NS (SSOP) package variant and is validated per JEDEC JESD78 reliability testing protocols.
Does SN74LVC244ANSR support 5V input signals while powered at 3.3V?
Yes, SN74LVC244ANSR accepts input voltages up to 5.5V regardless of VCC level-enabling direct interfacing with 5V peripherals while operating from a 3.3V supply. This is achieved through internal input clamp diodes and verified across the full –40°C to +125°C temperature range.
What is the purpose of the Ioff feature in SN74LVC244ANSR?
The Ioff feature in SN74LVC244ANSR disables all outputs when VCC = 0V, limiting leakage current to ±10µA maximum. This prevents back-driving of powered circuitry during hot-swap events or partial power-down states-critical for modular systems like blade servers and telecom line cards.
Can SN74LVC244ANSR drive a 50pF load within its specified timing?
Yes, SN74LVC244ANSR maintains its 5.9ns max tpd at 3.3V with up to 50pF load capacitance, as confirmed in the Switching Characteristics table. Performance remains within spec across –40°C to +125°C, provided layout follows TI's guidelines for trace length (<12cm) and damping.
Is SN74LVC244ANSR pin-compatible with other 20-pin octal buffers in TI's LVC family?
SN74LVC244ANSR shares identical pinout and function mapping with SN74LVC244A variants in NS, PW, DW, and DB packages-including 1OE/2OE control, A/Y signal pairing, and VCC/GND placement-enabling mechanical and electrical interchangeability within the same package type.
SN74LVC244ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- 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:
- 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-SO
SN74LVC244ANSR FAQ
1.How can I place an order for SN74LVC244ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ANSR 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 SN74LVC244ANSR reliable?
The price and inventory of SN74LVC244ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ANSR is usually 5 days.
3.What payment methods are accepted for SN74LVC244ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC244ANSR?
SN74LVC244ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244ANSR 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 SN74LVC244ANSR?
For technical support, including SN74LVC244ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ANSR requirements.
6.How does Aetrix verify that SN74LVC244ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ANSR 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 SN74LVC244ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVC244ANSR?
All SN74LVC244ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ANSR, 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 SN74LVC244ANSR part is unused and in its original packaging.
Return procedure for SN74LVC244ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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