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Texas Instruments SN74ACT244RKSR
- Part No.:
- SN74ACT244RKSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74ACT244RKSR.pdf
- Description:
- 8-CH, 4.5-V TO 5.5-V BUFFERS WIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,024
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Product details
Overview
SN74ACT244RKSR from Texas Instruments is an octal 3-state buffer/driver IC designed for bus-oriented data transmission, clock buffering, and memory address driving in industrial and telecom systems. It operates from 4.5 V to 5.5 V, delivers ±24 mA output drive per channel, achieves 9.5 ns maximum propagation delay at 5 V, and features TTL-compatible inputs with 5.5 V input tolerance. It is used in LED display drivers and switching network interface modules.
For engineers reviewing the SN74ACT244RKSR datasheet, SN74ACT244RKSR pinout, SN74ACT244RKSR application, or SN74ACT244RKSR equivalent, this page provides verified functional specifications, validated VQFN-20 pin mapping, confirmed thermal performance (RθJA = 67.7 °C/W), and two rigorously cross-referenced alternative parts for bus driver selection.
Technical Context
The SN74ACT244RKSR implements two independent 4-bit non-inverting buffers, each with dedicated active-low output-enable (OE) control. Its architecture supports bidirectional bus isolation by placing outputs in high-impedance state when OE is high, enabling shared data path management without contention.
It uses ACT (Advanced CMOS TTL-compatible) logic family technology, ensuring compatibility with legacy TTL signal levels while delivering CMOS power efficiency. Input thresholds are fixed at VIH = 2.0 V and VIL = 0.8 V at 5 V supply, and outputs maintain VOH ≥ 3.76 V and VOL ≤ 0.44 V under 24 mA load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances in industrial power environments. |
| Max Propagation Delay | 9.5 ns at 5 V - Enables reliable timing in high-speed address/data buses up to ~100 MHz system clock domains. |
| Output Drive | ±24 mA per channel - Sufficient to directly drive LEDs or interface with multiple TTL loads without external amplification. |
| Input Compatibility | TTL-compatible with VIH = 2.0 V min - Interoperates with legacy 5 V TTL logic families without level-shifting circuitry. |
| Operating Temperature | –45 °C to +125 °C - Qualified for extended industrial and harsh-environment applications beyond commercial grade. |
| Package Thermal Resistance | RθJA = 67.7 °C/W (VQFN-20) - Supports higher sustained power dissipation than SOIC or TSSOP variants under natural convection. |
Pinout & Package
The SN74ACT244RKSR is housed in a 20-pin VQFN package (RKS) with exposed thermal pad, optimized for space-constrained PCB layouts and improved thermal performance over leaded packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for Group 1 (pins 2–9) and Group 2 (pins 11–18); asserted low enables buffer pass-through. |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input signals - routed to corresponding Y outputs when 1OE is low. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Group 2 outputs - driven by 2A inputs (pins 11, 13, 15, 17) when 2OE is low. |
| 10 | GND | Ground reference for all logic and power paths; must be low-impedance connection to minimize noise coupling. |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input signals - routed to corresponding Y outputs when 2OE is low. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Group 1 outputs - driven by 1A inputs (pins 2, 4, 6, 8) when 1OE is low. |
| 20 | VCC | Primary power supply (4.5–5.5 V); requires local 0.1 µF bypass capacitor adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Dual independent OE inputs allow selective disabling of either 4-bit group, enabling flexible bus arbitration and multi-drop topology support. |
| High-Drive Capability | ±24 mA per output sustains robust signal integrity into capacitive loads (e.g., long traces, multiple gate inputs) without waveform degradation. |
| TTL-Compatible Inputs | Accepts 0–5.5 V input range with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V supply - eliminates need for external level translators in mixed-logic systems. |
| VQFN Thermal Performance | RθJA = 67.7 °C/W and RθJC(bot) = 24.1 °C/W - enables higher continuous current operation in compact industrial modules versus SOIC or SSOP alternatives. |
| Extended Temperature Range | –45 °C to +125 °C operating range - certified for deployment in automotive under-hood, base station RF sections, and industrial motor control enclosures. |
Applications
| LED Display Driver | Memory Address Buffer |
|---|---|
|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and telecom rack indicators. IC Role / Device Role / Timing Role: Acts as current-sinking or current-sourcing buffer between microcontroller GPIO and LED anodes/cathodes. Use Value: Delivers ±24 mA per channel to drive LEDs directly with 1 kΩ current-limiting resistors, eliminating discrete transistor stages. |
Use Scenario: Isolating and strengthening address lines between microprocessor and SRAM/Flash memory banks. IC Role / Device Role / Timing Role: Buffers multiplexed address signals to reduce loading on CPU pins and ensure clean edge transitions across PCB traces. Use Value: 9.5 ns max tpd preserves setup/hold timing margins in 20–33 MHz memory access cycles; 3-state outputs prevent bus contention during refresh or wait states. |
| Telecom Switching Network | Industrial Bus Interface |
|
Use Scenario: Signal conditioning and fan-out for control lines in packet-switched telecom backplanes and line cards. IC Role / Device Role / Timing Role: Provides logic-level translation and drive strength matching between ASIC control outputs and relay/FET gate drivers. Use Value: TTL-compatible inputs accept direct connection to legacy FPGA I/O banks; ±24 mA drive ensures fast turn-on of optocouplers or MOSFET gates. |
Use Scenario: Interfacing PLC I/O modules with fieldbus controllers (e.g., Modbus RTU, CAN physical layer transceivers). IC Role / Device Role / Timing Role: Buffers digital command signals between isolated communication ICs and local microcontrollers or FPGA peripherals. Use Value: Dual OE control allows synchronized enable/disable of command and status lanes; –45 °C to +125 °C rating supports operation in uncooled control cabinets. |
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), 32 mA drive, 3.3 V logic only - not 5 V tolerant. | Suitable for modern low-voltage embedded systems but incompatible with 5 V buses or TTL inputs. | Select when migrating to 3.3 V designs and full 5 V interoperability is unnecessary. |
| SN74ABT244N | Higher drive (±64 mA), same 4.5–5.5 V range, but larger SOIC-20 package and higher ICC (20 mA typical vs. 4 µA). | Better for heavy capacitive loads or longer trace runs; less suitable for thermally constrained or low-quiescent-current designs. | Choose when absolute maximum signal integrity is required and board space/thermal budget permits SOIC footprint. |
Compared with SN74LVC244APWR and SN74ABT244N, the SN74ACT244RKSR uniquely balances 5 V TTL compatibility, moderate power consumption (4 µA ICC), VQFN thermal efficiency, and industrial temperature range - making it optimal for legacy-system upgrades and space-limited 5 V industrial interfaces.
Availability
SN74ACT244RKSR is available at Aetrix Electronics and suitable for LED display drivers, memory address buffering, and telecom switching networks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ACT244RKSR 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 SN74ACT244RKSR belongs to TI's legacy ACT logic family, engineered for robust 5 V system interfacing with TTL compatibility, high noise immunity, and reliability in mission-critical industrial infrastructure.
FAQ
What is the operating voltage range for the SN74ACT244RKSR?
The SN74ACT244RKSR operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V power rails while accommodating typical supply tolerances in industrial environments. Operation outside this range may cause functional failure or permanent damage, as specified in the Absolute Maximum Ratings table.
Does the SN74ACT244RKSR support 3.3 V logic inputs?
No, the SN74ACT244RKSR does not reliably support 3.3 V logic inputs as valid high-level signals. Its VIH minimum is 2.0 V at 5 V VCC, but it is not 3.3 V tolerant - inputs must remain within 0–VCC and are designed for 5 V TTL signaling. For mixed-voltage systems, level-shifting circuitry is required.
What is the thermal performance of the SN74ACT244RKSR in its VQFN package?
The SN74ACT244RKSR in the RKS (VQFN-20) package has a junction-to-ambient thermal resistance (RθJA) of 67.7 °C/W and junction-to-case (bottom) resistance (RθJC(bot)) of 24.1 °C/W. These values reflect superior heat dissipation versus SOIC or TSSOP variants, supporting higher sustained output current in compact layouts.
Can the SN74ACT244RKSR drive LEDs directly?
Yes, the SN74ACT244RKSR can drive LEDs directly using appropriate current-limiting resistors. With ±24 mA per output and VOL ≤ 0.44 V at 24 mA, it supports common-anode or common-cathode configurations. A 1 kΩ resistor at 5 V limits current to ~5 mA, well within safe operating limits.
How are the output-enable pins configured on the SN74ACT244RKSR?
The SN74ACT244RKSR has two active-low output-enable pins: 1OE (Pin 1) controls outputs 1Y1–1Y4, and 2OE (Pin 19) controls outputs 2Y1–2Y4. When either OE is high, its associated four outputs enter high-impedance state; when low, non-inverted data passes from A inputs to Y outputs.
SN74ACT244RKSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (2.5x4.5)
SN74ACT244RKSR FAQ
1.How can I place an order for SN74ACT244RKSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244RKSR 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 SN74ACT244RKSR reliable?
The price and inventory of SN74ACT244RKSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244RKSR is usually 5 days.
3.What payment methods are accepted for SN74ACT244RKSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244RKSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244RKSR?
SN74ACT244RKSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244RKSR 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 SN74ACT244RKSR?
For technical support, including SN74ACT244RKSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244RKSR requirements.
6.How does Aetrix verify that SN74ACT244RKSR is sourced from the original manufacturer or authorized distributors?
All SN74ACT244RKSR 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 SN74ACT244RKSR meets industry standards.
7.What is the process for return or replacement of SN74ACT244RKSR?
All SN74ACT244RKSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244RKSR, 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 SN74ACT244RKSR part is unused and in its original packaging.
Return procedure for SN74ACT244RKSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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