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Texas Instruments SN74ACT244PWRE4
- Part No.:
- SN74ACT244PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244PWRE4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,431
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Product details
Overview
SN74ACT244PWRE4 from Texas Instruments is an octal 3-state non-inverting buffer/driver IC designed for bus interface, memory address driving, and clock distribution in 5-V TTL-compatible systems. It features dual 4-bit channels with independent active-low output-enable (OE) controls, 24-mA sink/source drive capability per output, 9.5-ns maximum propagation delay at 5 V, and operation across –40°C to +85°C.
For engineers reviewing the SN74ACT244PWRE4 datasheet, SN74ACT244PWRE4 pinout, SN74ACT244PWRE4 application, or SN74ACT244PWRE4 equivalent, key selection criteria include 3-state bus contention control, TTL-input compatibility, 5-V supply tolerance, thermal performance in TSSOP-20, and direct replacement suitability in legacy 74ACT logic designs.
Technical Context
The SN74ACT244PWRE4 implements two independent 4-bit buffer sections, each with dedicated active-low OE inputs enabling precise per-group bus isolation. Its TTL-compatible inputs accept 2-V minimum high-level signals at 5-V VCC, while outputs drive ±24 mA with guaranteed VOH ≥3.76 V and VOL ≤0.44 V under load.
It operates strictly within 4.5 V to 5.5 V supply range and supports high-speed digital interfacing via fast switching: tPLH/tPHL ≤10 ns, tPZH/tPHZ ≤10.5 ns, and tPZL/tPLZ ≤10.5 ns at 5 V. All unused inputs must be tied to VCC or GND to prevent floating states and ensure deterministic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V rail tolerances. |
| Max Propagation Delay | 9.5 ns at 5 V - Enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| Output Drive | ±24 mA per channel - Sufficient to directly drive LEDs, TTL loads, or multiple CMOS inputs without external buffers. |
| Input Compatibility | TTL - Accepts standard 2-V VIH/0.8-V VIL thresholds, eliminating level-shifting in mixed-logic systems. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and industrial ambient environments. |
| ESD Rating (HBM) | ±3000 V - Robust handling during PCB assembly and system integration. |
| Power Dissipation Cap. | 45 pF per buffer - Predictable dynamic power consumption in clocked or data-switching applications. |
Pinout & Package
TSSOP-20 (PW) package: 6.5-mm × 4.4-mm body, 0.65-mm pitch, exposed pad optional, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable for Channel 1 (pins 2–9) and Channel 2 (pins 11–18); asserts high-impedance state when high. |
| 2, 4, 6, 8 | 1A1–1A4 | Non-inverting input pins for first 4-bit buffer group; drive corresponding Y outputs when OE low. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Inverted-order outputs for second 4-bit group (2A1–2A4); sourced from pins 11, 13, 15, 17 respectively. |
| 10 | GND | Ground reference for all logic and I/O; requires low-inductance connection to minimize noise coupling. |
| 11, 13, 15, 17 | 2A1–2A4 | Non-inverting inputs for second 4-bit buffer group; drive 1Y1–1Y4 outputs (pins 18, 16, 14, 12) when 2OE low. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Outputs for first 4-bit group; mirror 1A1–1A4 when 1OE low; high-Z otherwise. |
| 20 | VCC | 5-V power supply; requires local 0.1-µF bypass capacitor placed adjacent to pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-State Control | Dual OE inputs allow selective isolation of either 4-bit bus segment without affecting the other - critical for multi-master arbitration. |
| TTL-Compatible Inputs | Accepts 2-V VIH at 5-V VCC, enabling direct interface with legacy 74LS/74F logic without level shifters. |
| High-Drive Outputs | Guaranteed ±24-mA drive supports direct LED sinking or sourcing with simple current-limiting resistors. |
| Low Propagation Skew | Matched tPLH/tPHL ensures minimal inter-bit timing mismatch across all eight outputs - essential for parallel bus integrity. |
| Robust ESD Protection | ±3000-V HBM rating reduces risk of field failure during handling and board-level testing. |
Applications
| LED Display Driver | Memory Address Buffer |
|---|---|
Use Scenario: Driving 7-segment or dot-matrix LED displays in industrial HMIs and instrumentation panels. IC Role / Device Role / Timing Role: Acts as current-sinking driver for common-anode LED segments, controlled by microcontroller GPIOs. Use Value: Eliminates need for discrete transistors; ±24-mA per output supports bright LED visibility with 1-kΩ current-limiting resistors at 5 V. |
Use Scenario: Isolating and strengthening CPU address lines before routing to SRAM or flash memory arrays. IC Role / Device Role / Timing Role: Buffers multiplexed address buses with low skew and 3-state capability to prevent contention during memory access cycles. Use Value: Maintains signal integrity over longer traces; dual OE enables interleaved bank addressing without bus conflicts. |
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
Use Scenario: Level-shifting and bus buffering between FPGA-based line cards and legacy TDM switch fabric in telecom equipment. IC Role / Device Role / Timing Role: Provides bidirectional 3-state isolation between clock domains while preserving TTL voltage thresholds. Use Value: Enables hot-swap-safe backplane communication; fast 9.5-ns delay supports 100-MHz synchronous bus timing margins. |
Use Scenario: Expanding digital input/output capacity in programmable logic controllers using modular carrier boards. IC Role / Device Role / Timing Role: Interfaces microcontroller parallel ports to opto-isolated field I/O modules with noise-immune drive strength. Use Value: Delivers robust 24-mA drive into capacitive PLC backplane loads; wide temperature range ensures reliability in uncontrolled cabinet environments. |
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 | 1.65–3.6-V supply range; lower drive (±24 mA only at 3.3 V); CMOS inputs (not TTL-compatible). | Suitable for 3.3-V systems; incompatible with 5-V TTL signaling without level translation. | Select when migrating to low-voltage logic; avoid in mixed 5-V/TTL environments. |
| 74ACT244SCX | Same ACT family, SOIC-20 package; identical electrical specs but obsolete status and limited availability. | Drop-in replacement where legacy footprint and qualification are mandatory. | Prefer SN74ACT244PWRE4 for new designs due to active production, TSSOP thermal advantage, and full TI support. |
Compared with SN74LVC244APWR and 74ACT244SCX, SN74ACT244PWRE4 uniquely combines 5-V TTL compatibility, industrial temperature range, active manufacturing status, and superior thermal resistance (RθJA = 126.2°C/W) in a space-efficient TSSOP package - making it optimal for legacy-system upgrades and cost-sensitive industrial interfaces.
Availability
SN74ACT244PWRE4 is available at Aetrix Electronics and suitable for LED display drivers, memory address buffering, telecom backplane interfaces, and industrial PLC I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT244PWRE4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74ACT244PWRE4 belongs to TI's 74ACT advanced CMOS logic family, engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial and telecom infrastructure.
FAQ
What is the supply voltage range for SN74ACT244PWRE4?
The SN74ACT244PWRE4 operates strictly within a 4.5-V to 5.5-V supply range. Operation outside this window risks undefined behavior or damage. The device draws only 4 µA typical quiescent current at 5.5 V, supporting low-power standby modes when both OE inputs are held high.
Does SN74ACT244PWRE4 support TTL-level inputs?
Yes, SN74ACT244PWRE4 accepts TTL-compatible input voltages: VIH ≥2.0 V and VIL ≤0.8 V at 5-V VCC. This allows direct connection to 74LS, 74F, and other legacy TTL outputs without level-shifting circuitry - a key differentiator from LVC-family alternatives.
What is the maximum output drive capability of SN74ACT244PWRE4?
SN74ACT244PWRE4 delivers ±24 mA per output at VCC = 5 V, with VOL ≤0.44 V and VOH ≥3.76 V under that load. This enables direct LED driving, fanout to 10+ CMOS inputs, or robust signal transmission across noisy industrial backplanes.
How does the 3-state control work on SN74ACT244PWRE4?
SN74ACT244PWRE4 uses two active-low output-enable inputs (1OE on pin 1, 2OE on pin 19). When either OE is high, its associated four outputs enter high-impedance state. When low, the corresponding A inputs pass non-inverted to Y outputs - enabling independent bus segment control.
Is SN74ACT244PWRE4 RoHS compliant and what is its moisture sensitivity level?
Yes, SN74ACT244PWRE4 is RoHS compliant with NiPdAu lead finish and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), per JEDEC J-STD-020. Its TSSOP-20 package supports standard 260°C reflow profiles without preconditioning.
SN74ACT244PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74ACT244PWRE4 FAQ
1.How can I place an order for SN74ACT244PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244PWRE4 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 SN74ACT244PWRE4 reliable?
The price and inventory of SN74ACT244PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244PWRE4?
SN74ACT244PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244PWRE4 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 SN74ACT244PWRE4?
For technical support, including SN74ACT244PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244PWRE4 requirements.
6.How does Aetrix verify that SN74ACT244PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244PWRE4 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 SN74ACT244PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244PWRE4?
All SN74ACT244PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244PWRE4, 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 SN74ACT244PWRE4 part is unused and in its original packaging.
Return procedure for SN74ACT244PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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