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Texas Instruments SN74ACT244PWRG4
- Part No.:
- SN74ACT244PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244PWRG4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,626
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Product details
Overview
SN74ACT244PWRG4 from Texas Instruments is an octal 3-state buffer/driver IC designed for bus-oriented data transmission and memory address driving. It features dual 4-bit channels with independent active-low output-enable (OE) controls, 4.5–5.5 V operation, TTL-compatible inputs, and 9.5 ns maximum propagation delay at 5 V - enabling high-speed bidirectional bus interfacing in industrial control backplanes and server I/O subsystems.
For engineers reviewing the SN74ACT244PWRG4 datasheet, SN74ACT244PWRG4 pinout, SN74ACT244PWRG4 application, or SN74ACT244PWRG4 equivalent, key selection criteria include its 24 mA output drive capability per channel, 20-pin TSSOP package with 0.65 mm pitch, guaranteed 3-state isolation, and compatibility with 5 V logic families in noise-sensitive digital systems.
Technical Context
The SN74ACT244PWRG4 implements two independent 4-bit non-inverting buffers, each with dedicated active-low OE input. Its architecture supports simultaneous enable/disable of either 4-bit group, allowing flexible bus partitioning and direction control without external logic.
Each output delivers ±24 mA sink/source current at VCC = 5 V with VOL ≤ 0.44 V and VOH ≥ 3.76 V, meeting TTL voltage thresholds while maintaining CMOS-level input compatibility. The device operates across –40°C to +85°C and exhibits 8 ns/V maximum input transition rate tolerance.
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 clock domains with margin. |
| Output Drive | ±24 mA per channel - sufficient to directly drive LEDs, TTL loads, or multiple CMOS inputs without buffering. |
| Input Compatibility | TTL-compatible with VIH ≥ 2 V at 5 V - interoperates with legacy 74LS/74F logic without level shifters. |
| 3-State Leakage | ±2.5 µA at VCC = 5.5 V - minimizes bus contention current when outputs are disabled. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and telecom infrastructure. |
| ESD Rating (HBM) | ±3000 V - exceeds JEDEC JS-001 Class 2 requirements for robust handling in manufacturing environments. |
Pinout & Package
The SN74ACT244PWRG4 is housed in a 20-pin TSSOP (PW) package with 0.65 mm lead pitch, 6.5 mm × 4.4 mm body size, and exposed thermal pad for enhanced power dissipation. Pin 1 is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low output-enable inputs - independently disable Group 1 (pins 2–9) or Group 2 (pins 11–18) outputs to high-impedance state. |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input terminals - accept TTL/CMOS logic signals routed to corresponding Y outputs when 1OE is low. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Group 2 output terminals - deliver non-inverted copies of 2A inputs (pins 11, 13, 15, 17) when 2OE is low. |
| 10 | GND | Ground reference - must be connected to system ground plane with low-inductance path for signal integrity. |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input terminals - drive corresponding 2Y outputs (pins 3, 5, 7, 9) under control of 2OE. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Group 1 output terminals - mirror 1A inputs (pins 2, 4, 6, 8) when 1OE is asserted low. |
| 20 | VCC | Power supply - requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables selective bus gating - e.g., isolate memory address lines from data lines using separate OE controls. |
| High-output drive (±24 mA) | Drives up to 15 LS-TTL loads or 60 CMOS loads per output, reducing need for external drivers in dense PCB layouts. |
| Low propagation delay (9.5 ns max) | Supports 100 MHz bus clocking with setup/hold margins intact, critical for synchronous data capture in FPGA interfaces. |
| TTL-compatible inputs | Accepts 2 V minimum VIH at 5 V VCC - eliminates level-shifting circuitry when interfacing with legacy 74LS devices. |
| 3-state output leakage (±2.5 µA) | Prevents bus contention current buildup during hot-swap or partial system reset scenarios in modular backplane designs. |
Applications
| Industrial Backplane Interface | Server Memory Address Buffering |
|---|---|
Use Scenario: Isolating CPU address bus from multiple peripheral slots in a ruggedized PLC chassis. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer that gates address signals to selected slot while maintaining bus integrity during arbitration. Use Value: Prevents address line contention during hot-insertion; ±24 mA drive ensures signal integrity over 15 cm backplane traces. |
Use Scenario: Driving multiplexed address lines from a microcontroller to dual SRAM banks in a network appliance. IC Role / Device Role / Timing Role: Non-inverting buffer with independent OE control for time-multiplexed bank selection. Use Value: 9.5 ns tPD enables sub-100 ns address setup times; TTL compatibility avoids level translation between MCU and memory. |
| Telecom Line Card Signal Conditioning | LED Display Column Driver |
Use Scenario: Level-shifting and fan-out amplification of control signals between FPGA and analog front-end ASIC on a 10G line card. IC Role / Device Role / Timing Role: Voltage-tolerant buffer (inputs accept up to 5.5 V) isolating 3.3 V FPGA I/O from 5 V ASIC interface. Use Value: Eliminates external clamping diodes; 8 ns/V input slew rate tolerance accommodates fast FPGA edge rates without ringing. |
Use Scenario: Sourcing current to 8-segment LED digits in a programmable logic controller HMI panel. IC Role / Device Role / Timing Role: High-current sink driver (24 mA per segment) with 3-state capability for multiplexed display scanning. Use Value: Direct LED drive without series resistors at 5 V; low VOL (0.44 V) maximizes forward voltage headroom for bright illumination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), 3.5 ns tPD, 1.8 V input compatible | Requires level shifting for 5 V systems; suited for mixed-voltage FPGA I/O banks | Select when migrating to 3.3 V core logic and needing lower power consumption. |
| 74ACT244SCX | Same 5 V operation, identical pinout, but SOIC-20 (DW) package instead of TSSOP-20 | Larger footprint (7.5 mm × 12.8 mm vs. 6.5 mm × 4.4 mm); higher thermal resistance (RθJA = 101.2°C/W) | Choose for through-hole prototyping or where TSSOP reflow capability is unavailable. |
Compared with SN74LVC244APWR and 74ACT244SCX, the SN74ACT244PWRG4 uniquely balances 5 V compatibility, compact TSSOP packaging, and industrial temperature range - making it optimal for space-constrained 5 V bus interfaces requiring proven reliability.
Availability
SN74ACT244PWRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, server memory subsystems, and telecom line card signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ACT244PWRG4 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 high-reliability digital interface ICs.
The SN74ACT244PWRG4 belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise 5 V digital interfacing in industrial, computing, and communications equipment.
FAQ
What is the operating voltage range for the SN74ACT244PWRG4?
The SN74ACT244PWRG4 operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V power supplies while accommodating typical rail tolerances. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings table of the official datasheet.
Does the SN74ACT244PWRG4 support 3.3 V logic inputs?
No, the SN74ACT244PWRG4 does not guarantee 3.3 V logic compatibility. Its inputs are TTL-compatible with VIH ≥ 2.0 V at VCC = 5 V, but it lacks 3.3 V tolerant input structure. For mixed-voltage systems, use SN74LVC244APWR instead - which explicitly supports 1.8 V to 3.6 V operation and 3.3 V inputs.
What is the maximum output current per channel on the SN74ACT244PWRG4?
The SN74ACT244PWRG4 delivers ±24 mA per output channel under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This rating is validated per TI's electrical characteristics table and supports direct driving of LEDs or multiple TTL loads without external amplification.
How does the 3-state functionality work on the SN74ACT244PWRG4?
The SN74ACT244PWRG4 uses two active-low output-enable inputs (1OE and 2OE) to place either 4-bit group into high-impedance state. When OE is high, outputs float electrically - enabling bus sharing among multiple drivers. Pull-up resistors on OE pins ensure safe high-Z state during power-up, preventing bus contention.
Is the SN74ACT244PWRG4 RoHS compliant and lead-free?
Yes, the SN74ACT244PWRG4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging addendum, it carries MSL Level-1 rating with unlimited floor life and peak reflow tolerance up to 260°C - confirming full compliance with J-STD-020 and EU RoHS Directive 2011/65/EU.
SN74ACT244PWRG4 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
SN74ACT244PWRG4 FAQ
1.How can I place an order for SN74ACT244PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244PWRG4 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 SN74ACT244PWRG4 reliable?
The price and inventory of SN74ACT244PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT244PWRG4?
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4.How is shipping managed for SN74ACT244PWRG4?
SN74ACT244PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244PWRG4 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 SN74ACT244PWRG4?
For technical support, including SN74ACT244PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244PWRG4 requirements.
6.How does Aetrix verify that SN74ACT244PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244PWRG4 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 SN74ACT244PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT244PWRG4?
All SN74ACT244PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244PWRG4, 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 SN74ACT244PWRG4 part is unused and in its original packaging.
Return procedure for SN74ACT244PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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