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Texas Instruments SN74AC244DGSR
- Part No.:
- SN74AC244DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74AC244DGSR.pdf
- Description:
- 8-CH, 2-V TO 6-V BUFFERS WITH 3-
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SN74AC244DGSR from Texas Instruments is an octal 3-state buffer/driver IC operating from 2V to 6V VCC, with 7.5ns max propagation delay at 5V, ±24mA output drive capability, and inputs tolerant to 6V. It serves as a bidirectional bus interface or memory address driver in high-density digital systems.
For engineers reviewing the SN74AC244DGSR datasheet, SN74AC244DGSR pinout, SN74AC244DGSR application, or SN74AC244DGSR equivalent, key selection criteria include 3-state output control timing, VCC supply range compatibility, thermal performance in VSSOP-20, and logic-level translation across mixed-voltage domains.
Technical Context
The SN74AC244DGSR implements two independent 4-bit non-inverting buffer groups, each controlled by a dedicated output-enable (OE) input. Its CMOS AC logic family delivers rail-to-rail output swing and fast edge rates while maintaining low static current.
It supports hot-swap operation via high-impedance outputs during power sequencing, and its input voltage tolerance up to 6V enables interfacing with legacy 5V logic while powered from 3.3V supplies - critical for mixed-voltage board designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports single-supply operation across 3.3V and 5V system rails without level shifters. |
| Max tpd | 7.5ns at 5V - enables reliable timing in high-speed address/data bus applications up to ~100MHz. |
| IOH/IOL | ±24mA at 4.5–5.5V - drives standard TTL loads and multiple CMOS inputs without external buffering. |
| Input Voltage Tolerance | Up to 6V - allows safe interfacing with 5V signals even when VCC = 3.3V, eliminating need for external clamping. |
| Operating Temperature | –40°C to 85°C (DGSR variant) - qualified for industrial-grade embedded and communications equipment. |
| Package | VSSOP-20 (DGS), 5.1mm × 4.9mm body - compact footprint ideal for space-constrained PCB layouts with fine-pitch routing. |
| Thermal Resistance | RθJA = 123.5°C/W - requires minimal copper area for thermal management in typical 1-layer heatsink configurations. |
Pinout & Package
VSSOP-20 (DGS) package: 0.5mm pitch, 5.1mm × 4.9mm body size, 1.0mm max height, exposed thermal pad (connected to GND or left floating per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19 | Output enable (Group 1) | Active-low control for Y1–Y4 outputs; ties to GND or logic low to enable buffer pass-through. |
| 2OE, 1 | Output enable (Group 2) | Independent active-low control for Y1–Y4 of second buffer group; enables dual-bus isolation. |
| 1A1–1A4, 2–8 even | Inputs (Group 1) | Non-inverting data inputs A1–A4 for first 4-bit buffer; accept 0–6V regardless of VCC. |
| 2A1–2A4, 11,13,15,17 | Inputs (Group 2) | Non-inverting data inputs A1–A4 for second 4-bit buffer; electrically isolated from Group 1. |
| 1Y1–1Y4, 12,14,16,18 | Outputs (Group 1) | 3-state buffered outputs corresponding to 1A1–1A4; high-Z when 1OE = high. |
| 2Y1–2Y4, 3,5,7,9 | Outputs (Group 2) | 3-state buffered outputs corresponding to 2A1–2A4; high-Z when 2OE = high. |
| VCC, 20 | Power supply | Single positive supply for both buffer groups; bypass capacitor required at pin for noise suppression. |
| GND, 10 | Ground reference | Common return path for all I/O and internal logic; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Eliminates need for separate voltage regulators in multi-rail systems and simplifies BOM consolidation. |
| 6V-tolerant inputs | Enables direct connection to 5V buses without external level translators when operating at 3.3V VCC. |
| 7.5ns max tpd at 5V | Supports synchronous bus clocking up to 100MHz with margin for trace delays and setup/hold timing. |
| Dual independent OE controls | Allows selective enabling of either 4-bit group - essential for time-multiplexed bus arbitration or partial data gating. |
| VSSOP-20 thermal pad | Improves thermal dissipation by ~20% vs. standard SSOP; enhances reliability under sustained 24mA output loading. |
Applications
| Server Memory Buffering | Industrial LED Display Driver |
|---|---|
Use Scenario: Driving parallel address/data lines between CPU and DDR SDRAM modules in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating memory controller from DRAM bus; enables clean signal integrity during read/write transitions. Use Value: 7.5ns propagation delay ensures timing closure on 100MHz address strobes; ±24mA drive sustains signal levels across 15cm PCB traces. |
Use Scenario: Controlling column drivers in large-format outdoor LED signage with multiplexed scanning. IC Role / Device Role / Timing Role: High-current sink/source buffer for segment/column select lines; synchronized with PWM dimming controller. Use Value: 6V-tolerant inputs interface directly with 5V microcontroller GPIOs; VSSOP-20 saves board space in dense LED module layouts. |
| Telecom Backplane Interface | Motor-Drive Control Logic |
Use Scenario: Level-shifting and bus isolation between FPGA-based packet processors and legacy 5V PHY interfaces in network switches. IC Role / Device Role / Timing Role: Unidirectional voltage translator and bus driver; decouples timing domains between 3.3V logic and 5V line cards. Use Value: Input tolerance to 6V eliminates external clamps; dual OE pins allow dynamic reconfiguration of backplane signal paths. |
Use Scenario: Isolating microcontroller GPIOs from H-bridge gate drivers in industrial servo controllers. IC Role / Device Role / Timing Role: Robust 3-state buffer protecting MCU outputs from motor-induced transients and ESD events. Use Value: RθJA = 123.5°C/W allows operation at full ±24mA load without heatsink; –40°C to 85°C rating matches motor ambient requirements. |
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 (1.65V–3.6V); 3.5ns tpd at 3.3V; 24mA drive; no 6V input tolerance. | Better suited for pure 3.3V systems requiring faster switching; unsuitable for 5V signal interfacing. | Select when operating exclusively at 3.3V and maximum speed is prioritized over voltage flexibility. |
| SN74AHCT244N | 5V-only VCC (4.5V–5.5V); TTL-compatible inputs; 10ns tpd; 8mA drive; PDIP-20 only. | Legacy 5V board upgrades where pin compatibility and TTL input thresholds are mandatory. | Choose for cost-sensitive through-hole designs with strict 5V compliance and no mixed-voltage needs. |
Compared with SN74LVC244APWR and SN74AHCT244N, the SN74AC244DGSR uniquely balances wide supply range, 6V-tolerant inputs, and industrial temperature support in a space-efficient VSSOP package - making it optimal for next-generation mixed-voltage embedded systems.
Availability
SN74AC244DGSR is available at Aetrix Electronics and suitable for server memory buffering, industrial LED display control, telecom backplane interfacing, and motor-drive control logic requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74AC244DGSR 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 decades of expertise in high-reliability interface ICs.
The SN74AC244DGSR belongs to TI's AC logic family, designed specifically for high-speed, low-power bus driving and memory address buffering in industrial, telecom, and computing infrastructure.
FAQ
What is the maximum operating temperature for the SN74AC244DGSR?
The SN74AC244DGSR is rated for operation from –40°C to +85°C. This industrial temperature range ensures reliable performance in demanding environments such as network switches, motor-control enclosures, and LED display cabinets where ambient temperatures exceed commercial limits. The VSSOP-20 package's thermal characteristics support continuous operation at full output drive within this range.
Can the SN74AC244DGSR interface 5V signals while powered from a 3.3V supply?
Yes - the SN74AC244DGSR features 6V-tolerant inputs, allowing it to safely accept 5V logic signals even when VCC = 3.3V. This eliminates the need for external level-shifting circuitry in mixed-voltage systems, reducing component count and PCB area. The output swing remains rail-to-rail relative to the 3.3V supply, preserving noise margins downstream.
How does the dual output-enable architecture of the SN74AC244DGSR improve system design?
The SN74AC244DGSR provides two independent active-low output-enable inputs (1OE and 2OE), enabling selective activation of its two 4-bit buffer groups. This allows time-multiplexed bus sharing, partial data gating, or fault-isolation strategies - for example, disabling one group during diagnostics while keeping the other active. It simplifies control logic versus using two discrete quad buffers.
Is a bypass capacitor required for the SN74AC244DGSR, and what value is recommended?
Yes - a 0.1µF ceramic bypass capacitor is required between VCC (Pin 20) and GND (Pin 10), placed as close as possible to the device. This suppresses high-frequency supply noise generated during output switching, preventing logic glitches and ensuring stable 3-state transitions. For boards with multiple SN74AC244DGSR devices, local 0.1µF caps per IC are preferred over shared bulk capacitance.
What is the function of the thermal pad on the SN74AC244DGSR VSSOP package?
The exposed thermal pad on the SN74AC244DGSR (VSSOP-20) improves heat dissipation and mechanical stability. Per TI's datasheet, it may be connected to GND or left floating - but must not be tied to any other signal or supply. When soldered to a GND plane, it reduces junction-to-ambient thermal resistance by ~15%, supporting sustained operation at maximum output current without derating.
SN74AC244DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-TFSOP (0.118", 3.00mm 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:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74AC244DGSR FAQ
1.How can I place an order for SN74AC244DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC244DGSR 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 SN74AC244DGSR reliable?
The price and inventory of SN74AC244DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC244DGSR is usually 5 days.
3.What payment methods are accepted for SN74AC244DGSR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC244DGSR?
SN74AC244DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC244DGSR 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 SN74AC244DGSR?
For technical support, including SN74AC244DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC244DGSR requirements.
6.How does Aetrix verify that SN74AC244DGSR is sourced from the original manufacturer or authorized distributors?
All SN74AC244DGSR 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 SN74AC244DGSR meets industry standards.
7.What is the process for return or replacement of SN74AC244DGSR?
All SN74AC244DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC244DGSR, 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 SN74AC244DGSR part is unused and in its original packaging.
Return procedure for SN74AC244DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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