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Texas Instruments SN74ALVC244DWR
- Part No.:
- SN74ALVC244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC244DWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,912
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Product details
Overview
SN74ALVC244DWR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation. It features two independent 4-bit channels (1A→1Y and 2A→2Y), separate output-enable (OE) inputs per group, ±24-mA drive strength at 3.3 V, and a maximum propagation delay of 2.8 ns at 3.3 V. It is used in bidirectional bus interfacing between microcontrollers and peripheral logic in industrial control modules.
For engineers reviewing the SN74ALVC244DWR datasheet, SN74ALVC244DWR pinout, SN74ALVC244DWR application, or SN74ALVC244DWR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), 3-state output isolation timing (ten = 4.5 ns, tdis = 4.2 ns at 3.3 V), SOIC-20 package thermal resistance (θJA = 58 °C/W), and ESD robustness (2000-V HBM).
Technical Context
The SN74ALVC244DWR implements dual 4-bit noninverting buffers with independent 3-state control-1OE governs Y1–Y4, 2OE governs Y1'–Y4'. Each channel operates with CMOS-compatible input thresholds (VIL = 0.35×VCC, VIH = 0.65×VCC at 1.65 V) and rail-to-rail output swing (VOH ≥ VCC − 0.2 V, VOL ≤ 0.2 V).
Its logic diagram confirms positive-logic enable behavior: low OE enables data flow (A→Y); high OE forces high-impedance outputs. To ensure safe power-up/down states, TI recommends tying OE to VCC via a pullup resistor sized for the driver's sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage I/O bridging between 1.8-V, 2.5-V, and 3.3-V logic domains |
| tpd (max) | 2.8 ns at VCC = 3.3 V - enables reliable operation in high-speed digital interfaces up to ~350 MHz data rate |
| IO Drive | ±24 mA at VCC = 3.3 V - sufficient to drive 50-Ω transmission lines or fan out to ≥10 LVTTL loads |
| 3-State Leakage (IOZ) | ±10 µA at VCC = 3.6 V - ensures minimal bus contention current when outputs are disabled |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements without external protection diodes |
| Input Capacitance (Ci) | 4.5 pF - low loading preserves signal integrity on high-frequency address/data buses |
Pinout & Package
SN74ALVC244DWR uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, JEDEC MS-013 compliant. Thermal resistance θJA = 58 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables corresponding 4-bit buffer group; must be pulled high during power sequencing to avoid bus contention |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for each buffer channel; accept 1.65–3.6 V logic levels regardless of VCC |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive outputs only when respective OE is low; high-impedance state isolates bus segments during arbitration |
| VCC (Pin 10) | Power supply | Single supply for all logic and I/O; decoupling capacitor required within 10 mm of pin |
| GND (Pin 20) | Ground reference | Common return path for all signals and supply current; must be low-inductance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (1.65–3.6 V) | Enables interoperability across 1.8-V, 2.5-V, and 3.3-V subsystems without level shifters |
| ±24-mA output drive at 3.3 V | Supports direct driving of terminated transmission lines or multiple downstream CMOS inputs |
| Low propagation delay (2.8 ns) | Minimizes timing skew in parallel bus applications such as memory address latching or FPGA I/O expansion |
| Independent 3-state controls (1OE/2OE) | Allows selective enabling of upper/lower nibbles for partial bus isolation in multi-master systems |
| High noise immunity (VIH/VIL ratios) | Guarantees clean switching with >30% noise margin at 1.8 V and >40% at 3.3 V, reducing false triggering |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and buffering address/data lines between a 3.3-V ARM Cortex-M7 MCU and legacy 5-V tolerant peripherals on a modular I/O backplane. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control, providing voltage translation and hot-swap-safe 3-state isolation during module insertion/removal. Use Value: Eliminates need for discrete level shifters; ±24-mA drive ensures signal integrity over 15-cm backplane traces; 2.8-ns tpd maintains timing margins in 50-MHz synchronous transfers. |
Use Scenario: Expanding GPIO count of a resource-constrained STM32H7 microcontroller to drive 16-channel LED matrix and 8-bit sensor interface simultaneously. IC Role / Device Role / Timing Role: Octal noninverting buffer with dual 3-state groups, enabling time-multiplexed access to shared data lines while preventing bus contention. Use Value: Independent 1OE/2OE pins allow software-controlled partitioning of Y1–Y4 and Y1'–Y4'; low 4.5-ns ten supports 100-kHz multiplexing without visible flicker or sensor read errors. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
|
Use Scenario: Driving CAN transceiver enable lines and isolated relay drivers from a 2.5-V automotive microcontroller in a body control unit. IC Role / Device Role / Timing Role: Level-shifting buffer with robust ESD protection, translating low-voltage MCU outputs to higher-current 3.3-V logic for downstream drivers. Use Value: 2000-V HBM rating withstands harsh automotive environments; 1.65–3.6 V operation accommodates battery voltage fluctuations; 58 °C/W θJA allows operation at 85°C ambient without derating. |
Use Scenario: Generating precise, glitch-free digital stimulus patterns for IC functional testing using a 3.3-V FPGA-based pattern generator. IC Role / Device Role / Timing Role: Output buffer stage ensuring clean, fast edge transitions and low-output impedance to drive 50-Ω coaxial cables to DUTs. Use Value: 2.8-ns tpd and <100-ps skew between channels maintain sub-nanosecond timing accuracy; ±24-mA drive sustains 1-Vpp signal amplitude into 50-Ω loads at 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive (±24 mA only at VCC ≥ 2.7 V); identical pinout and logic function | Marginally slower tpd (3.2 ns at 3.3 V); same SOIC-20 footprint | Preferred where cost sensitivity outweighs 0.4-ns timing advantage; suitable for ≤40-MHz bus speeds |
| 74AVC8T244PW | Higher speed (tpd = 2.1 ns at 3.3 V); 1.2–3.6 V range; TSSOP-20 package | Requires PCB layout change due to TSSOP-20 vs SOIC-20; better thermal performance (θJA = 83 °C/W) | Chosen when sub-2.5-ns propagation is critical and board space permits TSSOP; not drop-in compatible |
Compared with SN74ALVC244DWR, SN74LVC244APWR offers identical functionality at lower cost but sacrifices 0.4 ns speed and full 1.65-V operation; 74AVC8T244PW delivers superior timing and wider voltage range but mandates package redesign and has higher thermal resistance.
Availability
SN74ALVC244DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, and automotive body control modules requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for SN74ALVC244DWR 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 logic solutions, with over 50 years of innovation in high-reliability interface and power management ICs.
The SN74ALVC244DWR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-voltage, high-speed bus interfacing in space-constrained industrial and automotive systems where robustness and timing precision are critical.
FAQ
What is the minimum supply voltage for reliable operation of the SN74ALVC244DWR?
The SN74ALVC244DWR is specified for operation down to 1.65 V VCC. At this voltage, it maintains guaranteed logic thresholds (VIL ≤ 0.35×VCC, VIH ≥ 0.65×VCC), 4.4-ns max tpd, and ±4-mA output drive. Operation below 1.65 V is not characterized and may result in undefined behavior or increased static current.
Can SN74ALVC244DWR drive 5-V TTL inputs directly?
No. The SN74ALVC244DWR outputs swing rail-to-rail (0 V to VCC), so at VCC = 3.3 V, VOH ≈ 3.1 V - insufficient to meet TTL VIH(min) = 2.0 V reliably under load. For 5-V TTL interfacing, a dedicated level shifter or a 5-V-tolerant buffer like SN74LVC8T245 is required. SN74ALVC244DWR is not 5-V tolerant on inputs or outputs.
How should the OE pins be handled during power-up to prevent bus contention?
TI recommends tying both 1OE and 2OE to VCC through a pullup resistor. The minimum value is determined by the current-sinking capability of the controlling driver - typically 10 kΩ suffices for most microcontroller GPIOs. This ensures outputs remain in high-impedance until firmware explicitly asserts OE low, preventing spurious bus activity during reset.
What is the thermal performance of SN74ALVC244DWR in its SOIC-20 package?
The SN74ALVC244DWR in SOIC-20 (DW package) has a junction-to-ambient thermal resistance θJA of 58 °C/W under standard JEDEC test conditions. With typical ICC < 10 µA and output loading ≤ ±12 mA, power dissipation remains < 50 mW, resulting in < 3°C junction rise above ambient - well within the −40°C to +85°C operating range.
Does SN74ALVC244DWR support hot-swap or live-insertion applications?
Yes - the SN74ALVC244DWR's 3-state outputs, combined with its high-impedance disable state (IOZ ≤ ±10 µA) and robust ESD protection (2000-V HBM), make it suitable for hot-swap backplane interfaces. However, system-level protection (e.g., series resistors, TVS diodes) and controlled power sequencing remain essential to prevent inrush current or voltage overshoot damage during insertion.
SN74ALVC244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALVC244DWR FAQ
1.How can I place an order for SN74ALVC244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC244DWR 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 SN74ALVC244DWR reliable?
The price and inventory of SN74ALVC244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC244DWR is usually 5 days.
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Once your SN74ALVC244DWR 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 SN74ALVC244DWR?
For technical support, including SN74ALVC244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC244DWR requirements.
6.How does Aetrix verify that SN74ALVC244DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC244DWR 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 SN74ALVC244DWR meets industry standards.
7.What is the process for return or replacement of SN74ALVC244DWR?
All SN74ALVC244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC244DWR, 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 SN74ALVC244DWR part is unused and in its original packaging.
Return procedure for SN74ALVC244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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