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Texas Instruments SN74ALVCH244DWR
- Part No.:
- SN74ALVCH244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCH244DWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74ALVCH244DWR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V operation. It features two independent 4-bit channels, bus-hold circuitry on all data inputs, ±24-mA output drive at 3.3 V, and a maximum propagation delay of 2.8 ns - enabling reliable signal buffering in low-voltage digital bus interfaces.
For engineers reviewing the SN74ALVCH244DWR datasheet, SN74ALVCH244DWR pinout, SN74ALVCH244DWR application, or SN74ALVCH244DWR equivalent, key selection criteria include its dual 4-bit 3-state architecture, bus-hold input stabilization (eliminating external resistors), SOIC-20 package compatibility, and guaranteed performance across -40°C to +85°C industrial temperature range.
Technical Context
The SN74ALVCH244DWR implements two independent 4-bit non-inverting buffers, each controlled by a dedicated output-enable (OE) input. When OE is low, data passes from A-inputs to Y-outputs; when high, outputs enter high-impedance state - supporting bidirectional bus sharing and hot-swap isolation.
Its bus-hold circuitry actively maintains valid logic levels on undriven or floating inputs without external pullup/pulldown resistors, reducing BOM count and layout complexity. Latch-up immunity exceeds 250 mA per JESD 17, and ESD protection meets 2000-V HBM and 200-V MM standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing between 1.8-V, 2.5-V, and 3.3-V logic domains |
| tpd (Max) | 2.8 ns at 3.3 V - enables high-speed data transfer in memory address/data buses and FPGA I/O expansion |
| Output Drive | ±24 mA at 3.3 V - drives standard CMOS loads and multiple fanouts without signal degradation |
| Bus-Hold Current | ±45 µA at 2.3 V - actively holds unused inputs at valid logic states, eliminating need for external biasing |
| Input Voltage Thresholds | VIH = 2.0 V, VIL = 0.8 V at 3.3 V - ensures robust noise margin and compatibility with TTL and CMOS logic families |
| Thermal Resistance θJA | 58 °C/W (SOIC-DW) - supports stable operation under continuous load in compact industrial PCB layouts |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control, instrumentation, and communications equipment |
Pinout & Package
SN74ALVCH244DWR uses a 20-pin SOIC (DW) package with 7.5-mm body width, 2.65-mm max height, and 1.27-mm lead pitch - compatible with standard surface-mount assembly processes and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer sections; tie to VCC via pullup for safe power-up high-Z state |
| 1A1–1A4, 2A1–2A4 | Data inputs | Non-inverting inputs for Channel 1 and Channel 2; all feature integrated bus-hold circuitry |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive external loads only when corresponding OE is low; high-impedance otherwise |
| GND (Pin 10) | Ground reference | Primary return path for all internal logic and output current; must be low-inductance connection |
| VCC (Pin 20) | Power supply | Single-supply rail for entire device; bypass with 0.1-µF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (1.65–3.6 V) | Enables interoperability across legacy and next-gen low-voltage systems without level-shifting |
| Integrated bus-hold on all inputs | Eliminates external pullup/pulldown resistors, reducing component count and board area in sparse-bus designs |
| ±24-mA output drive at 3.3 V | Drives up to 10 LVTTL loads or 20 CMOS loads directly, simplifying interconnect in dense digital backplanes |
| Low propagation delay (2.8 ns) | Supports >350-MHz data rates in timing-critical applications like memory address latching and FPGA I/O buffering |
| High ESD/latch-up immunity | 2000-V HBM and >250-mA latch-up rating allow deployment in unshielded industrial environments with minimal protection circuitry |
Applications
| Industrial PLC I/O Expansion | FPGA Configuration Bus Buffering |
|---|---|
Use Scenario: Isolating and driving digital I/O signals between microcontroller and field-side sensors/actuators in programmable logic controllers. IC Role / Device Role / Timing Role: Octal 3-state buffer providing voltage-level translation, bus contention prevention, and hot-swap-safe signal routing. Use Value: Dual OE control allows independent enable/disable of input and output banks, enabling dynamic reconfiguration without bus glitches. |
Use Scenario: Buffering configuration data and status signals between FPGA and external PROM, flash, or monitoring ICs. IC Role / Device Role / Timing Role: Non-inverting driver ensuring clean, low-skew signal delivery during FPGA startup and runtime reconfiguration. Use Value: Bus-hold inputs prevent floating states during configuration handshaking, eliminating spurious resets or misreads. |
| Embedded Memory Address/Data Bus Interface | Test Equipment Digital Signal Conditioning |
Use Scenario: Driving address lines and data strobes between MCU and parallel SRAM or NOR flash in resource-constrained edge devices. IC Role / Device Role / Timing Role: High-speed octal buffer with precise tpd matching across channels to maintain setup/hold timing integrity. Use Value: 2.8-ns max tpd ensures sub-350-MHz clock domain compatibility while maintaining deterministic signal arrival windows. |
Use Scenario: Conditioning digital stimulus and response signals in automated test equipment (ATE) channel interface modules. IC Role / Device Role / Timing Role: 3-state isolator enabling multiplexed access to shared test buses and DUT signal lines. Use Value: Independent OE pins allow synchronized enable/disable of signal paths during test sequence transitions, preventing bus 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 |
|---|---|---|---|
| SN74LVC244APWR | Lower drive (±24 mA at 3.3 V same), but higher VIH/VIL thresholds (1.7 V/0.7 V at 2.3 V); no bus-hold | Requires external pullups for unused inputs; better suited for noise-immune fixed-bias systems | Select when bus-hold is unnecessary and tighter input threshold control is preferred |
| 74AVCH244TTR | Same VCC range and bus-hold, but TSSOP-20 package (PW); slightly higher θJA (83 °C/W) | Smaller footprint but reduced thermal margin; requires tighter thermal management in high-density layouts | Select when board space is constrained and thermal derating is acceptable |
Compared with SN74ALVCH244DWR, SN74LVC244APWR lacks bus-hold and demands external biasing, while 74AVCH244TTR offers identical functionality in a smaller TSSOP package with higher thermal resistance - making SN74ALVCH244DWR optimal for industrial SOIC-based designs requiring proven thermal headroom and self-stabilizing inputs.
Availability
SN74ALVCH244DWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, FPGA configuration bus buffering, and embedded memory address/data bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74ALVCH244DWR 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 for industrial, automotive, and communications markets.
The SN74ALVCH244DWR belongs to TI's ALVC/ALVCH advanced low-voltage CMOS logic family, engineered for high-speed, low-power, mixed-voltage interfacing in industrial control and programmable logic systems.
FAQ
What is the recommended power supply decoupling for SN74ALVCH244DWR?
Place a 0.1-µF ceramic capacitor between VCC (Pin 20) and GND (Pin 10) as close as possible to the device. For systems with high-frequency switching or multiple drivers, add a 4.7-µF bulk capacitor nearby. This minimizes supply noise and ensures stable bus-hold operation and consistent 2.8-ns propagation delay across all eight channels of the SN74ALVCH244DWR.
Does SN74ALVCH244DWR require external pullup resistors on its inputs?
No. The SN74ALVCH244DWR integrates active bus-hold circuitry on all eight data inputs (1A1–1A4, 2A1–2A4), which maintains valid logic states without external components. Using pullup or pulldown resistors with bus-hold enabled is not recommended, as it may cause excessive current draw or logic instability - a key design advantage of the SN74ALVCH244DWR over standard LVC buffers.
Can SN74ALVCH244DWR operate reliably at 1.8 V?
Yes. The SN74ALVCH244DWR is fully specified from 1.65 V to 3.6 V. At 1.8 V, it delivers guaranteed tpd ≤ 3.1 ns, VIH ≥ 1.17 V, and VIL ≤ 0.63 V - meeting timing and noise-margin requirements for modern ultra-low-voltage microcontrollers and FPGAs. Its ±24-mA drive capability is rated at 3.3 V, but functional operation at 1.8 V is validated across the full -40°C to +85°C range.
How does the dual OE structure of SN74ALVCH244DWR improve system design?
The SN74ALVCH244DWR provides separate 1OE and 2OE inputs for its two 4-bit sections, enabling independent control of signal flow direction and timing. This allows staggered enable/disable sequencing - for example, holding one channel active while tri-stating the other during bus arbitration - reducing contention risk and simplifying control logic compared to single-OE octal buffers. It directly enhances flexibility in FPGA I/O expansion and PLC backplane architectures using the SN74ALVCH244DWR.
Is SN74ALVCH244DWR pin-compatible with older 74-series buffers like SN74LS244?
No. While functionally similar as octal 3-state buffers, SN74ALVCH244DWR uses a 20-pin SOIC package with different pin assignments (e.g., GND at Pin 10, VCC at Pin 20) versus the 20-pin DIP/SOIC layout of SN74LS244. Electrical differences - including CMOS vs. bipolar process, 1.65–3.6-V vs. 4.75–5.25-V operation, and bus-hold integration - preclude direct replacement without schematic and layout revision. The SN74ALVCH244DWR is not a drop-in upgrade for LS-family designs.
SN74ALVCH244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- 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
SN74ALVCH244DWR FAQ
1.How can I place an order for SN74ALVCH244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH244DWR 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 SN74ALVCH244DWR reliable?
The price and inventory of SN74ALVCH244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH244DWR is usually 5 days.
3.What payment methods are accepted for SN74ALVCH244DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH244DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVCH244DWR?
SN74ALVCH244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH244DWR 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 SN74ALVCH244DWR?
For technical support, including SN74ALVCH244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH244DWR requirements.
6.How does Aetrix verify that SN74ALVCH244DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH244DWR 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 SN74ALVCH244DWR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH244DWR?
All SN74ALVCH244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH244DWR, 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 SN74ALVCH244DWR part is unused and in its original packaging.
Return procedure for SN74ALVCH244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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