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Texas Instruments SN74ACT244IDWREP
- Part No.:
- SN74ACT244IDWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT244IDWREP.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,401
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Product details
Overview
SN74ACT244IDWREP from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs in a 20-pin SOIC (DW) package, operating from 4.5 V to 5.5 V, with 9.5 ns max propagation delay at 5 V and ±24 mA output drive capability. It is used in memory address buffering, clock distribution, and bus interface applications requiring high noise immunity and TTL-compatible inputs.
For engineers reviewing the SN74ACT244IDWREP datasheet, SN74ACT244IDWREP pinout, SN74ACT244IDWREP application, or SN74ACT244IDWREP equivalent, key selection criteria include its dual 4-bit independent enable control, guaranteed high-impedance state during power sequencing, extended industrial temperature range (–40°C to 85°C), and compatibility with 5-V logic systems requiring robust bus isolation.
Technical Context
The SN74ACT244IDWREP implements two independent 4-bit noninverting buffers, each with dedicated output-enable (1OE, 2OE) inputs controlling high-impedance states. Its ACT logic family delivers TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and rail-to-rail output swing under load.
It supports hot-swap-safe operation when OE is pulled up to VCC via external resistor, ensuring outputs remain high-Z during power ramp. Input clamp current rating of ±20 mA and output current capability of ±24 mA at VOH/VOL define its robustness in noisy industrial environments.
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 tolerances and brown-out conditions. |
| 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 - Sinks or sources sufficient current to drive multiple TTL loads or terminate stubs on parallel buses. |
| Input Compatibility | TTL-compatible - Accepts standard 0.8 V/2.0 V logic thresholds without level-shifting circuitry. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial environments including factory automation and motor control cabinets. |
| 3-State Enable Logic | Active-low OE - Simplifies control interface with microcontrollers or CPLDs using active-low enable signals. |
| Input Clamp Current | ±20 mA - Protects against transient overvoltage events without external diodes in I/O protection schemes. |
Pinout & Package
SN74ACT244IDWREP uses a 20-pin SOIC (DW) package per JEDEC MS-013, 7.5 mm body width, 2.65 mm max height, 1.27 mm pitch. Pin 1 marked by notch or bevel; quadrants assigned Q1 per TI tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables for Group 1 (pins 2–5) and Group 2 (pins 18–15); tie to VCC via pull-up for power-up safety. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting input terminals for respective 4-bit groups; accept 0–5.5 V, TTL-compatible. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Buffered, noninverted outputs; high-impedance when corresponding OE is high. |
| VCC (Pin 10) | Power supply | 5-V nominal supply; decoupling capacitor required within 1 cm for switching noise suppression. |
| GND (Pin 20) | Ground reference | Common return path; must be low-inductance connection to minimize ground bounce in multi-driver systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables selective bus isolation - e.g., isolate memory address lines while keeping data lines active. |
| Guaranteed high-Z on power-up | Prevents bus contention during system reset or cold start when OE is externally pulled to VCC. |
| ACT logic family performance | Combines CMOS power efficiency with TTL input compatibility and fast 9.5 ns switching at full drive. |
| Extended temperature qualification | Validated per JEDEC standards including HAST, temperature cycling, and intermetallic life for industrial reliability. |
| Robust ESD and latch-up immunity | Meets JESD22-A114 (2 kV HBM) and JESD78 (100 mA latch-up immunity), reducing field failure risk. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting octal buffer isolating MCU address pins from capacitive bus load; provides current gain and noise margin. Use Value: Prevents address skew and ensures setup/hold compliance across long PCB traces due to matched 9.5 ns tPLH/tPHL propagation. | Use Scenario: Isolating Modbus RTU or Profibus DP master controller from field-side transceivers in factory automation panels. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling/disabling communication paths between isolated domains using separate OE controls. Use Value: Eliminates signal contention during hot-swap or fault recovery by forcing high-Z state on disabled segments. |
| Clock Distribution | Legacy Peripheral Interface |
Use Scenario: Fan-out of 5-V system clock to multiple FPGA configuration ICs or ADC sampling clocks in test equipment. IC Role / Device Role / Timing Role: Low-skew clock buffer with matched propagation delays across all eight outputs. Use Value: Maintains <1 ns inter-output skew, preserving timing margins in synchronous sampling systems. | Use Scenario: Interfacing legacy ISA-bus peripherals (e.g., data acquisition cards) to modern embedded hosts via bridge logic. IC Role / Device Role / Timing Role: Level-translating and load-driving buffer for 5-V ISA address/data/control lines. Use Value: Supports TTL-compatible signaling and drives >10 LSTTL loads per output without external drivers. |
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 |
|---|---|---|---|
| SN74ACT244MDWREP | Same functionality, but rated for –55°C to 125°C extended temperature range. | Suitable for aerospace, defense, or under-hood automotive where wider thermal range is mandatory. | Select SN74ACT244MDWREP only if operation beyond –40°C is required; otherwise SN74ACT244IDWREP offers optimal cost/performance for industrial use. |
| SN74LVC244A | 3.3-V only operation (1.65–3.6 V), lower drive (±24 mA), same pinout but different voltage domain. | Requires level-shifting when interfacing with 5-V systems; not drop-in compatible without redesign. | Choose SN74LVC244A only in new 3.3-V designs; avoid for 5-V legacy bus replacement due to incompatible supply and input thresholds. |
Compared with SN74ACT244MDWREP and SN74LVC244A, the SN74ACT244IDWREP uniquely balances industrial temperature range, 5-V compatibility, and proven reliability in bus-holding applications - making it the preferred choice for upgrades in existing 5-V infrastructure without layout changes.
Availability
SN74ACT244IDWREP is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interface, clock distribution, and legacy peripheral interface applications requiring stable component supply across extended product lifecycles.
Supply support for SN74ACT244IDWREP 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 experience in high-reliability industrial and aerospace components.
The SN74ACT244IDWREP belongs to TI's enhanced-product (EP) logic family, designed specifically for long-lifecycle industrial systems requiring controlled baseline manufacturing, extended temperature validation, and DMS support.
FAQ
What is the recommended power-up sequence for SN74ACT244IDWREP to avoid bus contention?
TI recommends tying both 1OE and 2OE to VCC through a pull-up resistor (minimum value determined by driver sink capability) before applying VCC. This ensures outputs remain in high-impedance state during power ramp. The SN74ACT244IDWREP is qualified for this behavior per JEDEC HAST and temperature cycling tests, and the internal design guarantees no glitching on Y outputs during VCC rise from 0 V to 4.5 V.
Does SN74ACT244IDWREP support hot-swap insertion into a live 5-V bus?
Yes - SN74ACT244IDWREP supports hot-swap when OE is held high (via pull-up) prior to insertion, and inputs are slew-rate limited (<8 ns/V). Its absolute maximum ratings allow VI up to VCC + 0.5 V and clamp current of ±20 mA, enabling safe insertion into powered-backplane environments. However, full hot-swap robustness requires external series resistors on A inputs per TI application note SCBA004.
Can SN74ACT244IDWREP drive more than one LSTTL load per output?
Yes - SN74ACT244IDWREP can drive up to 10 LSTTL loads per output, verified by its ±24 mA output current specification at VOL ≤ 0.5 V and VOH ≥ 3.7 V (at VCC = 4.5 V). This exceeds the LSTTL unit load definition (0.4 mA high, 1.6 mA low), making SN74ACT244IDWREP suitable for fan-out to multiple legacy logic devices without buffering.
Is SN74ACT244IDWREP pin-compatible with standard SN74ACT244 variants?
Yes - SN74ACT244IDWREP shares identical pinout, function, and SOIC-DW package with commercial SN74ACT244 and automotive SN74ACT244-Q1. All variants use the same 20-pin DW footprint and logic diagram; only temperature range, screening, and marking differ. No PCB layout change is needed when upgrading from commercial to SN74ACT244IDWREP in industrial designs.
What is the maximum capacitive load SN74ACT244IDWREP can drive while maintaining 9.5 ns propagation delay?
Per TI's switching characteristics table, the 9.5 ns max tPLH/tPHL is specified with CL = 50 pF. Electrical testing confirms SN74ACT244IDWREP maintains <10 ns delay up to 75 pF, but beyond that, delay increases linearly (~0.1 ns/pF). For designs targeting strict 9.5 ns budget, keep total load (including trace and input capacitance) ≤50 pF - achievable with short traces and minimal fan-out.
SN74ACT244IDWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ACT244IDWREP FAQ
1.How can I place an order for SN74ACT244IDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244IDWREP 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 SN74ACT244IDWREP reliable?
The price and inventory of SN74ACT244IDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244IDWREP is usually 5 days.
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4.How is shipping managed for SN74ACT244IDWREP?
SN74ACT244IDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244IDWREP 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 SN74ACT244IDWREP?
For technical support, including SN74ACT244IDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244IDWREP requirements.
6.How does Aetrix verify that SN74ACT244IDWREP is sourced from the original manufacturer or authorized distributors?
All SN74ACT244IDWREP 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 SN74ACT244IDWREP meets industry standards.
7.What is the process for return or replacement of SN74ACT244IDWREP?
All SN74ACT244IDWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244IDWREP, 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 SN74ACT244IDWREP part is unused and in its original packaging.
Return procedure for SN74ACT244IDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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