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Texas Instruments SN74ALVC244RGYR
- Part No.:
- SN74ALVC244RGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74ALVC244RGYR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
SN74ALVC244RGYR from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation. It features two independent 4-bit channels, each with separate output-enable (OE) inputs, ±24-mA drive strength at 3.3 V, 2.8-ns max propagation delay, and ESD protection exceeding JESD 22 standards. It is used in bidirectional bus interfacing between low-voltage microcontrollers and peripheral logic.
For engineers reviewing the SN74ALVC244RGYR datasheet, SN74ALVC244RGYR pinout, SN74ALVC244RGYR application, or SN74ALVC244RGYR equivalent, this page delivers verified electrical parameters, RGY-package thermal and layout data, functional truth table behavior, and validated alternative options for industrial bus buffering, level translation, and memory address/data driving.
Technical Context
The SN74ALVC244RGYR implements dual 4-bit non-inverting buffers with independent 3-state control per group. Each channel passes A→Y when its OE is low; outputs enter high-impedance state when OE is high. Input thresholds scale with VCC (VIH = 0.65×VCC min at 1.65 V), supporting mixed-voltage system interfacing.
It uses advanced ALVC CMOS process technology enabling rail-to-rail input tolerance (–0.5 V to VCC + 0.5 V), latch-up immunity >250 mA per JESD 17, and operation across –40°C to +85°C. The RGY package is a 3.5 mm × 4.5 mm VQFN with exposed thermal pad and 0.5-mm pitch, optimized for high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports direct interface with 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters |
| tpd (max) | 2.8 ns at 3.3 V - enables high-speed data transfer in memory address latching and parallel bus applications |
| IOL / IOH | ±24 mA at 3.0 V - drives heavy capacitive loads (e.g., >30-pF traces or multiple CMOS inputs) without signal degradation |
| IOZ (off-state leakage) | ±10 µA at 3.6 V - ensures minimal current draw and signal integrity during 3-state hold in power-sensitive systems |
| ESD Rating | 2000-V HBM - meets industrial IEC 61000-4-2 system-level robustness requirements for board-level ESD immunity |
| θJA | 37 °C/W (RGY package) - enables sustained operation at full drive strength without external heatsinking in compact enclosures |
| Operating Temp | –40°C to +85°C - qualified for industrial automation, motor control, and embedded computing environments |
Pinout & Package
VQFN-20 (RGY) package: 3.5 mm × 4.5 mm body, 0.5-mm lead pitch, 1-mm max height, exposed thermal pad (Pin 21) requiring PCB solder connection for thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs (active-low) | Independent enable for Group 1 (Pins 1A1–1A4 → 1Y1–1Y4) and Group 2 (2A1–2A4 → 2Y1–2Y4); must be pulled high via resistor during power-up to prevent bus contention |
| 1A1–1A4, 2A1–2A4 | Data inputs | Non-inverting input terminals for respective output groups; accept voltages from –0.5 V to VCC + 0.5 V, compatible with mixed-supply systems |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive outputs only when corresponding OE is low; present high-impedance state otherwise - essential for shared-bus arbitration |
| VCC (Pin 11), GND (Pin 10) | Power supply terminals | Single-supply operation; decoupling capacitor (0.1 µF ceramic) required within 3 mm of VCC/GND pins to suppress switching noise |
| Thermal Pad (Pin 21) | Exposed copper pad | Must be soldered to solid PCB copper pour for thermal dissipation and mechanical anchoring; not electrically connected internally |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage range | –0.5 V to VCC + 0.5 V - eliminates need for external clamping diodes when interfacing with overvoltage-tolerant peripherals |
| Scalable VIH/VIL thresholds | Input logic levels track VCC (e.g., VIH ≥ 0.65×VCC at 1.65 V) - ensures reliable switching across entire supply range without re-biasing |
| Low dynamic power consumption | 26 pF typical power-dissipation capacitance per buffer at 3.3 V - reduces total system power in high-frequency bus toggling scenarios |
| High noise immunity | ±24-mA drive capability combined with 0.4-V noise margin at 3.3 V - maintains signal integrity in electrically noisy industrial environments |
| Robust latch-up immunity | Exceeds 250 mA per JESD 17 - prevents destructive failure during transient overcurrent events on shared data lines |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 MCU with legacy 5-V tolerant I/O modules via a 24-bit parallel backplane. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer isolating MCU GPIOs from backplane capacitance and noise; enables clean address/data strobing at ≤25 MHz. Use Value: Eliminates discrete level shifters while maintaining 2.8-ns timing margin for setup/hold compliance across temperature and voltage corners. |
Use Scenario: Expanding GPIO count on a space-constrained IoT gateway using a 1.8-V SoC and external SPI flash, SRAM, and sensor arrays. IC Role / Device Role / Timing Role: Unidirectional data/address driver buffering signals between low-voltage core logic and higher-capacitance off-chip memories. Use Value: ±24-mA drive sustains signal rise/fall times <3 ns into 30-pF loads, preserving timing margins for 40-MHz SPI clock domains. |
| Automotive Body Control Module (BCM) Signal Conditioning | Test Equipment Digital Pattern Generator |
|
Use Scenario: Driving multiplexed LED indicators and relay drivers from a 3.3-V automotive microcontroller in a Class A EMC environment. IC Role / Device Role / Timing Role: Output buffer with controlled edge rates (5 ns/V input transition limit) minimizing radiated emissions during fast switching. Use Value: 2000-V HBM ESD rating and –40°C to +85°C qualification ensure robust operation in under-hood temperature cycling and load-dump transients. |
Use Scenario: Generating precise digital stimulus waveforms for IC functional testing, requiring glitch-free 3-state control and sub-3-ns edge fidelity. IC Role / Device Role / Timing Role: Programmable output stage enabling dynamic bus isolation during test vector transitions and fault injection sequences. Use Value: 4.5-ns enable/disable time (ten/tdis) and 2.8-ns tpd guarantee deterministic timing alignment across 8 parallel channels. |
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 | Same pinout, identical function, but LVC family: lower drive (±24 mA only at 3.3 V; degrades to ±12 mA at 2.5 V), slightly higher tpd (3.5 ns) | Suitable for cost-sensitive 3.3-V-only designs where thermal headroom is ample and timing margin >0.7 ns exists | Prefer SN74ALVC244RGYR when operating below 3.0 V or requiring guaranteed 2.8-ns tpd across full VCC range |
| 74AVC8T244PW | Different pinout (TSSOP-24), higher speed (1.8 ns tpd at 1.8 V), supports 1.2-V to 3.6-V operation, but no 20-pin RGY option | Better for ultra-low-voltage (1.2–1.8 V) applications or where tighter timing budgets demand sub-2-ns propagation | Choose SN74ALVC244RGYR for drop-in replacement in existing RGY-layout designs or when 20-pin footprint and thermal pad are mandatory |
Compared with SN74LVC244APWR and 74AVC8T244PW, the SN74ALVC244RGYR uniquely combines VQFN-20 RGY packaging with consistent ±24-mA drive down to 1.65 V and 2.8-ns tpd - making it optimal for thermally constrained, multi-voltage industrial PCBs requiring proven layout compatibility.
Availability
SN74ALVC244RGYR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, automotive body control modules, and automated test equipment requiring stable component supply and long-term production continuity.
Supply support for SN74ALVC244RGYR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ALVC244RGYR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-power, multi-voltage interoperability in space- and thermal-constrained industrial control and instrumentation systems.
FAQ
What is the recommended power-up sequence for SN74ALVC244RGYR to avoid bus contention?
TI specifies that OE inputs must be held high (via pull-up resistors to VCC) during power-up and power-down to ensure outputs remain in high-impedance state until VCC stabilizes. For SN74ALVC244RGYR, use ≥10-kΩ pull-ups on Pins 1OE and 2OE; this prevents unintended driving on shared buses before system initialization completes. The device does not include internal power-on reset circuitry.
Does SN74ALVC244RGYR support hot-swap or live-insertion applications?
SN74ALVC244RGYR is not rated for hot-swap operation. Its absolute maximum ratings do not cover powered insertion into live backplanes, and the lack of Ioff (power-off protection) means unpowered VCC can cause current backflow through inputs. For hot-swap interfaces, TI recommends dedicated hot-swap controllers or devices with explicit Ioff specification, such as the SN74AVCH series.
Can SN74ALVC244RGYR drive a 50-pF load while maintaining 2.8-ns propagation delay?
No - the 2.8-ns tpd is specified at CL = 50 pF only for VCC = 3.3 V in the switching characteristics table, but actual measured delay increases with load capacitance. At 50 pF, tpd rises to 3.1 ns (VCC = 3.3 V). For 50-pF loads requiring ≤2.8 ns, reduce VCC to 3.6 V (where tpd = 2.8 ns max) or select a faster family like AVC. Always verify with IBIS simulation for your specific trace impedance and termination.
Is the exposed thermal pad (Pin 21) of SN74ALVC244RGYR electrically connected internally?
No - the exposed thermal pad (Pin 21) on the SN74ALVC244RGYR is not electrically connected to any internal die node. It serves solely for thermal conduction and mechanical stability. TI requires it to be soldered to a PCB copper pour tied to GND for optimal thermal performance (θJA = 37 °C/W), but no electrical connection is needed or recommended unless explicitly grounded for EMI suppression per system design.
How does SN74ALVC244RGYR handle input voltages exceeding VCC?
SN74ALVC244RGYR supports input voltages up to VCC + 0.5 V (absolute max VO = 4.6 V), enabling limited overvoltage tolerance without external clamping. However, sustained operation above VCC risks increased ICC and potential latch-up if current exceeds ±50 mA. For reliable >VCC interfacing, TI recommends external series resistors or dedicated level translators - the SN74ALVC244RGYR itself is not a level shifter.
SN74ALVC244RGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-VFQFN Exposed Pad
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74ALVC244RGYR FAQ
1.How can I place an order for SN74ALVC244RGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC244RGYR 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 SN74ALVC244RGYR reliable?
The price and inventory of SN74ALVC244RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC244RGYR is usually 5 days.
3.What payment methods are accepted for SN74ALVC244RGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC244RGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC244RGYR?
SN74ALVC244RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC244RGYR 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 SN74ALVC244RGYR?
For technical support, including SN74ALVC244RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC244RGYR requirements.
6.How does Aetrix verify that SN74ALVC244RGYR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC244RGYR 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 SN74ALVC244RGYR meets industry standards.
7.What is the process for return or replacement of SN74ALVC244RGYR?
All SN74ALVC244RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC244RGYR, 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 SN74ALVC244RGYR part is unused and in its original packaging.
Return procedure for SN74ALVC244RGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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