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Texas Instruments SN74ACT244DWRG4
- Part No.:
- SN74ACT244DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT244DWRG4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,558
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Product details
Overview
SN74ACT244DWRG4 from Texas Instruments is an octal 3-state non-inverting buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory address driving in 5-V digital systems. It features dual 4-bit channels with independent active-low output-enable inputs, 24-mA output drive capability per channel, 9.5-ns maximum propagation delay at 5 V, and TTL-compatible inputs operating across 4.5 V to 5.5 V supply range.
For engineers reviewing the SN74ACT244DWRG4 datasheet, SN74ACT244DWRG4 pinout, SN74ACT244DWRG4 application, or SN74ACT244DWRG4 equivalent, this device is selected for high-density 3-state bus interfacing where low skew, rail-to-rail output swing, and robust noise immunity are required in industrial control backplanes and telecom line-card designs.
Technical Context
The SN74ACT244DWRG4 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output-enable (OE) input. Its ACT logic family delivers CMOS-level power efficiency with bipolar-like speed and drive strength, supporting bidirectional bus isolation via high-impedance outputs when OE is asserted.
Each channel operates with guaranteed VOH ≥ 3.76 V and VOL ≤ 0.44 V at IOL = 24 mA and VCC = 5.5 V, and supports input voltages up to 5.5 V - exceeding VCC - enabling safe interfacing with mixed-voltage subsystems without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and tolerance to supply ripple. |
| Max Propagation Delay | 9.5 ns at 5 V - enables reliable operation in high-speed address/data buses up to ~100 MHz toggle rate. |
| Output Drive (IOL/IOH) | ±24 mA - sufficient to directly drive LEDs, terminated transmission lines, or multiple TTL loads without external buffers. |
| Input Voltage Tolerance | Up to 5.5 V - allows interfacing with 5-V logic even when VCC is at minimum 4.5 V, eliminating need for clamping diodes. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded applications including network infrastructure and factory automation. |
| ESD Rating (HBM) | ±3000 V - exceeds JEDEC JS-001 Class 2, supporting robust handling in automated assembly environments. |
| Power Dissipation Cap | 45 pF per buffer - defines dynamic power consumption under 1-MHz switching with 50-pF load, critical for thermal budgeting. |
Pinout & Package
SN74ACT244DWRG4 is packaged in a 20-pin SOIC (DW) body measuring 7.5 mm × 12.8 mm with 1.27-mm pitch. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 (pins 1A1–1A4 → 1Y1–1Y4) and Channel 2 (2A1–2A4 → 2Y1–2Y4). |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered input terminals - TTL-compatible with VIH ≥ 2.0 V at VCC = 5 V. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state non-inverting outputs - sink/source ±24 mA while maintaining VOL ≤ 0.44 V / VOH ≥ 3.76 V. |
| 10 | GND | Ground reference for all logic and output stages - must be low-impedance to support fast edge rates and minimize ground bounce. |
| 20 | VCC | Primary power supply - requires local 0.1-µF ceramic bypass capacitor placed adjacent to pin for stable high-frequency operation. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Dual independent OE inputs enable selective channel isolation on shared buses without contention or signal corruption. |
| TTL-Compatible Inputs | VIH = 2.0 V min at VCC = 5 V ensures direct interface with legacy 5-V TTL logic families without level translation. |
| High-Drive Outputs | 24-mA sink/source capability per output supports direct LED driving or fan-out to ≥10 standard TTL loads. |
| Overvoltage-Tolerant Inputs | Inputs accept up to 5.5 V regardless of VCC setting - simplifies mixed-supply system integration and reduces BOM count. |
| Low Propagation Skew | Typical tPLH/tPHL = 6.5 ns with <1 ns inter-output skew - preserves timing integrity across multi-bit data paths. |
Applications
| Industrial Backplane Bus Interface | Telecom Line Card Data Buffering |
|---|---|
|
Use Scenario: Isolating microcontroller address/data buses from high-capacitance backplane traces in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing bidirectional bus separation and slew-controlled signal integrity. Use Value: Enables hot-swap capability and prevents bus contention during firmware updates by asserting OE during reconfiguration. |
Use Scenario: Driving parallel control signals between FPGA-based packet processors and PHY modules in optical line cards. IC Role / Device Role / Timing Role: Low-skew octal driver synchronizing configuration registers and status flags across 8-bit control interfaces. Use Value: Delivers 24-mA drive into 50-Ω terminated lines, maintaining clean edges at 20-ns rise/fall times without external termination. |
| LED Segment Driver for Panel Displays | Memory Address Latching in Embedded Systems |
|
Use Scenario: Directly sourcing/sinking current for 7-segment LED digits in industrial HMI panels using common-anode/cathode topologies. IC Role / Device Role / Timing Role: High-current buffer converting MCU GPIO outputs into segment drive signals with current limiting via external resistors. Use Value: Eliminates need for discrete transistor arrays - single SN74ACT244DWRG4 drives up to eight segments at ≤5 mA each with VOL ≤ 0.44 V. |
Use Scenario: Latching and buffering address lines between ARM Cortex-M4 core and external SRAM/Flash in real-time motion controllers. IC Role / Device Role / Timing Role: Address driver isolating CPU address bus from memory module capacitance to meet setup/hold timing margins. Use Value: 9.5-ns max tPD ensures address valid window remains >2 ns at 50-MHz bus clocks, preventing memory access failures. |
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 VCC range (1.65–3.6 V), 24-mA drive, but only 3.3-V compatible - no 5-V tolerance. | Suitable for modern low-voltage embedded systems; incompatible with legacy 5-V buses or mixed-voltage interfaces. | Select when migrating to 3.3-V domains and full 5-V interoperability is not required. |
| 74AC244SCX | Same 4.5–5.5-V range and pinout, but AC logic family - slightly higher ICC (max 40 µA vs. 4 µA) and lower ESD rating (2 kV HBM). | Acceptable for cost-sensitive industrial designs where ultra-low quiescent current or high ESD immunity is secondary. | Choose for legacy AC-family compatibility or where TI's ACT process-specific reliability is not mandated. |
Compared with SN74LVC244APWR and 74AC244SCX, SN74ACT244DWRG4 uniquely combines 5-V bus compatibility, 5.5-V input overvoltage tolerance, and ±3-kV HBM ESD protection - making it the preferred choice for retrofitting or upgrading existing 5-V infrastructure with enhanced robustness.
Availability
SN74ACT244DWRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, telecom line-card buffering, LED display drivers, and memory address latching requiring stable component supply and long-term production continuity.
Supply support for SN74ACT244DWRG4 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.
SN74ACT244DWRG4 belongs to TI's ACT (Advanced CMOS Technology) logic family - engineered for high-speed, high-drive 5-V digital interfacing with superior noise immunity and bus-contention resilience.
FAQ
What is the maximum operating temperature range for SN74ACT244DWRG4?
The SN74ACT244DWRG4 is rated for operation from –40 °C to +85 °C, meeting industrial temperature requirements. This range is validated per TI's production testing and applies specifically to the DW (SOIC) package variant, as confirmed in the SCAS517G datasheet revision March 2024.
Does SN74ACT244DWRG4 support 5-V tolerant inputs when powered at 4.5 V?
Yes, SN74ACT244DWRG4 inputs accept voltages up to 5.5 V regardless of VCC level - including at the minimum 4.5 V supply. This overvoltage tolerance is explicitly specified in Section 5.1 Absolute Maximum Ratings and enables safe interfacing with 5-V sources in brownout conditions.
Can SN74ACT244DWRG4 drive LEDs directly?
Yes, SN74ACT244DWRG4 can drive LEDs directly with appropriate current-limiting resistors. Its 24-mA output sink/source capability and VOL ≤ 0.44 V at IOL = 24 mA allow reliable operation with typical indicator LEDs at ≤5 mA per segment, as demonstrated in TI's Figure 8-1 application circuit.
What is the recommended bypass capacitor for SN74ACT244DWRG4?
A 0.1-µF ceramic capacitor is recommended for SN74ACT244DWRG4, placed as close as possible to the VCC (pin 20) and GND (pin 10) pins. This value is specified in Section 8.3 Power Supply Recommendations to suppress high-frequency noise and maintain stable switching performance.
Is SN74ACT244DWRG4 pin-compatible with other SN74ACT244 variants?
Yes, SN74ACT244DWRG4 shares identical pinout and functionality with all other SN74ACT244 variants in SOIC (DW), SSOP (DB), TSSOP (PW), and PDIP (N) packages. Pin mapping is standardized across the family per Figures 4-2 and Table 4-1 in the SCAS517G datasheet.
SN74ACT244DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ACT244DWRG4 FAQ
1.How can I place an order for SN74ACT244DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244DWRG4 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 SN74ACT244DWRG4 reliable?
The price and inventory of SN74ACT244DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244DWRG4 transactions.
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4.How is shipping managed for SN74ACT244DWRG4?
SN74ACT244DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244DWRG4 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 SN74ACT244DWRG4?
For technical support, including SN74ACT244DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244DWRG4 requirements.
6.How does Aetrix verify that SN74ACT244DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244DWRG4 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 SN74ACT244DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244DWRG4?
All SN74ACT244DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244DWRG4, 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 SN74ACT244DWRG4 part is unused and in its original packaging.
Return procedure for SN74ACT244DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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