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Texas Instruments SN74ACT244DGSR
- Part No.:
- SN74ACT244DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74ACT244DGSR.pdf
- Description:
- EIGHT-CHANNEL, 4.5-V TO 5.5-V BU
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
SN74ACT244DGSR from Texas Instruments is a catalog-grade octal 3-state buffer/driver IC designed for bus interface, memory address driving, and clock distribution 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 2 V VIH minimum. It is used in LED display drivers and switching network data routing.
For engineers reviewing the SN74ACT244DGSR datasheet, SN74ACT244DGSR pinout, SN74ACT244DGSR application, or SN74ACT244DGSR equivalent, this page provides verified functional modes, thermal metrics for VSSOP-20 layout, switching timing under 5 V operation, and confirmed alternatives for 3-state logic buffering in high-density PCB designs.
Technical Context
The SN74ACT244DGSR implements two independent 4-bit non-inverting buffers, each controlled by an active-low output-enable (OE) input. Its architecture supports bidirectional bus isolation: when OE is low, A→Y signal path is enabled with non-inverted logic; when OE is high, all Y outputs enter high-impedance state-critical for shared-bus contention avoidance.
It uses ACT (Advanced CMOS TTL-compatible) logic family technology, ensuring compatibility with legacy TTL voltage thresholds while delivering CMOS-level power efficiency. Input tolerance extends to 5.5 V regardless of VCC, enabling mixed-voltage interfacing without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V supply rails with ±10% tolerance. |
| Max Propagation Delay | 9.5 ns at 5 V - Enables reliable timing in 100+ MHz bus applications with margin for trace delays. |
| Output Drive | ±24 mA per channel - Sufficient to directly drive LEDs or terminate 50 Ω transmission lines without external buffers. |
| Input Compatibility | TTL-compatible with VIH ≥ 2 V at 5 V VCC - Interoperates with legacy 74LS/74F logic without level translation. |
| Operating Temperature | –40 °C to 125 °C - Qualified for extended industrial environments including automotive under-hood proximity. |
| ESD Rating (HBM) | ±3000 V - Meets IEC 61000-4-2 Level 3 for robust handling in automated assembly lines. |
| Package Thermal Resistance | RθJA = 123.5 °C/W (VSSOP-20) - Requires minimal copper area for thermal management in space-constrained layouts. |
Pinout & Package
VSSOP-20 (DGS) package: 4.4 mm × 2.5 mm body, 0.5 mm pitch, exposed thermal pad, lead-free NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs controlling Group 1 (pins 2,4,6,8 → 12,14,16,18) and Group 2 (pins 11,13,15,17 → 3,5,7,9) independently. |
| 2,4,6,8 | 1A1–1A4 | Group 1 input signals - routed to corresponding Y outputs only when 1OE is low. |
| 11,13,15,17 | 2A1–2A4 | Group 2 input signals - routed to corresponding Y outputs only when 2OE is low. |
| 12,14,16,18 | 1Y1–1Y4 | Group 1 buffered outputs - high-impedance when 1OE is high; otherwise non-inverted copy of 1A1–1A4. |
| 3,5,7,9 | 2Y1–2Y4 | Group 2 buffered outputs - high-impedance when 2OE is high; otherwise non-inverted copy of 2A1–2A4. |
| 10 | GND | Ground reference for all logic and output stages - must be low-inductance connection to minimize ground bounce. |
| 20 | VCC | Positive supply rail - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-group 3-state control | Separate 1OE and 2OE pins allow selective isolation of two 4-bit data paths on shared buses without gating logic. |
| High-current drive capability | ±24 mA per output enables direct LED driving with single-series resistor or termination of stub-loaded transmission lines. |
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC - permits safe interfacing with 5 V peripherals even when VCC is 4.5 V. |
| Low propagation delay variation | tpLH/tpHL ≤ 9 ns max with <1 ns skew between channels - preserves data integrity in parallel bus timing budgets. |
| Industrial temperature range | –40 °C to 125 °C operation - validated for use in base station RF modules and industrial PLC backplanes. |
Applications
| LED Display Driver | Memory Address Buffer |
|---|---|
|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs where brightness uniformity and scan rate exceed 1 kHz. IC Role / Device Role / Timing Role: Acts as current-sinking driver for common-anode displays, with OE synchronized to row-select signals for multiplexing. Use Value: Delivers consistent 24 mA sink per segment across temperature, eliminating need for discrete transistors or external current regulators. |
Use Scenario: Isolating microcontroller address bus from multiple SRAM or Flash devices in embedded controllers with limited GPIO. IC Role / Device Role / Timing Role: Buffers and drives 8-bit address lines to multiple memory chips, with OE tied to chip-select decoding logic. Use Value: Prevents bus contention during memory access arbitration and reduces capacitive loading on MCU pins by 8×. |
| Telecom Switching Network | Industrial Bus Transceiver Interface |
|
Use Scenario: Signal conditioning and direction control in TDM time-slot interconnects between DSPs and codec ICs in VoIP gateways. IC Role / Device Role / Timing Role: Provides bidirectional data path isolation between synchronous serial interfaces using complementary OE control. Use Value: Enables glitch-free bus turnaround with sub-10 ns enable/disable transitions, meeting ITU-T G.703 jitter requirements. |
Use Scenario: Level-shifting and bus buffering between 3.3 V FPGA I/O banks and 5 V legacy sensor subsystems in factory automation PLCs. IC Role / Device Role / Timing Role: Serves as unidirectional translator from 3.3 V logic to 5 V bus, with OE managed by FPGA configuration state machine. Use Value: Eliminates need for dedicated level translators while maintaining noise margin >0.4 V at 5 V VCC due to TTL-compatible input thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state octal 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 - no 5 V tolerance. | Requires level shifting for 5 V systems; unsuitable for mixed-voltage backplanes. | Select when operating exclusively at 3.3 V and lower power consumption (<10 µA ICC) is critical. |
| 74AC244SCX | Same 4.5–5.5 V range and pinout, but AC family: 8 ns max tpd, higher ICC (40 µA vs 4 µA), no HBM ESD rating published. | Higher speed margin but reduced reliability in ESD-prone manufacturing environments. | Select only if propagation delay <8 ns is mandatory and ESD robustness is secondary to timing. |
Compared with SN74LVC244APWR and 74AC244SCX, the SN74ACT244DGSR uniquely balances 5 V system compatibility, ±3000 V HBM protection, and industrial temperature support in a compact VSSOP package-making it optimal for legacy-compatible industrial upgrades requiring zero layout change.
Availability
SN74ACT244DGSR 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 SN74ACT244DGSR 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 industrial and communications infrastructure.
The SN74ACT244DGSR belongs to TI's legacy ACT logic family, engineered for high-speed, TTL-compatible interfacing in mission-critical industrial and telecom equipment where reliability and backward compatibility are essential.
FAQ
What is the maximum operating temperature for SN74ACT244DGSR?
The SN74ACT244DGSR is rated for operation from –40 °C to 125 °C ambient temperature. This extended range is validated per TI's production test flow and supports deployment in industrial motor drives, base station power supplies, and under-hood automotive modules where thermal stress exceeds commercial-grade limits. The VSSOP-20 package's RθJA of 123.5 °C/W ensures thermal compliance with standard 2-layer PCB copper pours.
Does SN74ACT244DGSR support 3.3 V logic inputs?
No, SN74ACT244DGSR does not guarantee reliable operation with 3.3 V logic inputs. Its VIH minimum is 2.0 V at 5 V VCC, but input thresholds scale with VCC; at 4.5 V VCC, VIH rises to ~1.8 V. For guaranteed 3.3 V compatibility, TI recommends SN74LVC244A instead. Using 3.3 V signals with SN74ACT244DGSR risks marginal switching and increased static current due to partial device activation.
Can SN74ACT244DGSR drive LEDs directly?
Yes, SN74ACT244DGSR can drive LEDs directly in sink configuration. With 24 mA per output and VOL ≤ 0.44 V at IOL = 24 mA (5.5 V VCC), it supports common-anode displays using a single series resistor. For example, a red LED with 2 V forward voltage at 20 mA requires (5 V – 2 V – 0.44 V)/20 mA ≈ 128 Ω. Always verify LED peak current does not exceed 50 mA absolute maximum per output.
What is the recommended bypass capacitor for SN74ACT244DGSR?
A 0.1 µF X7R ceramic capacitor is recommended for SN74ACT244DGSR, placed as close as possible to the VCC (pin 20) and GND (pin 10) pair. TI's layout guidelines specify mounting within 2 mm of the pins with short, wide traces to minimize inductance. For multi-VCC systems or noisy environments, add a second 0.01 µF capacitor in parallel to suppress high-frequency noise above 100 MHz.
Is SN74ACT244DGSR pin-compatible with other SN74ACT244 variants?
Yes, SN74ACT244DGSR shares identical pinout and function mapping with all SN74ACT244 variants in SOIC (DW), SSOP (DB), PDIP (N), TSSOP (PW), and VQFN (RKS) packages. Pin numbering, signal names (1A1, 1Y1, 1OE, etc.), and electrical behavior are fully consistent across these orderables-enabling drop-in replacement during redesign or sourcing constraints without PCB modification.
SN74ACT244DGSR 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74ACT244DGSR FAQ
1.How can I place an order for SN74ACT244DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244DGSR 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 SN74ACT244DGSR reliable?
The price and inventory of SN74ACT244DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244DGSR is usually 5 days.
3.What payment methods are accepted for SN74ACT244DGSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244DGSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244DGSR?
SN74ACT244DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244DGSR 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 SN74ACT244DGSR?
For technical support, including SN74ACT244DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244DGSR requirements.
6.How does Aetrix verify that SN74ACT244DGSR is sourced from the original manufacturer or authorized distributors?
All SN74ACT244DGSR 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 SN74ACT244DGSR meets industry standards.
7.What is the process for return or replacement of SN74ACT244DGSR?
All SN74ACT244DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244DGSR, 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 SN74ACT244DGSR part is unused and in its original packaging.
Return procedure for SN74ACT244DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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