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Texas Instruments SN74ACT244MDWREP
- Part No.:
- SN74ACT244MDWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT244MDWREP.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:163
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Product details
Overview
SN74ACT244MDWREP from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory address driving, clock distribution, and bus interfacing in high-reliability industrial systems. It operates from 4.5 V to 5.5 V, supports –55°C to 125°C extended temperature range, delivers 24 mA output drive, and achieves 9.5 ns max propagation delay at 5 V.
For engineers reviewing the SN74ACT244MDWREP datasheet, SN74ACT244MDWREP pinout, SN74ACT244MDWREP application, or SN74ACT244MDWREP equivalent, key selection criteria include its dual 4-bit independent enable control, TTL-compatible inputs, rail-to-rail output voltage swing, and SOIC-20 DW package compatibility with legacy 74ACT logic designs.
Technical Context
This device implements two independent 4-bit noninverting buffers, each with dedicated 3-state output-enable (1OE, 2OE) inputs. Logic operation follows positive-enable convention: low OE enables pass-through of A→Y signals; high OE forces Y outputs into high-impedance state. Input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2 V), ensuring interoperability with legacy 5-V logic families.
Designed for robustness in harsh environments, SN74ACT244MDWREP features controlled baseline manufacturing, JEDEC-qualified extended temperature operation (–55°C to 125°C), and enhanced DMS support. Its absolute maximum ratings allow input voltages up to VCC + 0.5 V and clamp currents of ±20 mA, supporting safe hot-swap and mixed-voltage interface scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial 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 toggle rate. |
| Output Drive | ±24 mA - Sufficient to drive 50-Ω transmission lines or fan out to ≥10 standard TTL loads without external buffering. |
| Input Compatibility | TTL-level - Accepts 0.8 V/2.0 V thresholds and 5.5 V-tolerant inputs, simplifying integration with legacy microcontrollers and FPGAs. |
| Operating Temperature | –55°C to 125°C - Qualified per JEDEC standards for use in aerospace, defense, and downhole industrial equipment. |
| 3-State Leakage | ±0.25 µA at 5.5 V - Minimizes bus contention current and power loss when outputs are disabled in large parallel systems. |
| Power Dissipation Cap | 45 pF - Predictable dynamic loading for timing analysis and PCB trace impedance matching in synchronous bus designs. |
Pinout & Package
SN74ACT244MDWREP is housed in a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.6 mm body width, and 2.65 mm max height - compatible with standard SOIC-20 footprints and automated assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-Low Output Enable | Independent control of Group 1 (pins 2–5) and Group 2 (pins 18–15) outputs; tie to VCC via pullup for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4 | Buffer Inputs | Noninverting data inputs for respective 4-bit groups; TTL-compatible with 5.5 V tolerance. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-State Outputs | Driven outputs when OE low; high-impedance when OE high - enables bidirectional bus sharing without external direction control. |
| VCC (Pin 10), GND (Pin 20) | Power Supply | Single 4.5–5.5 V supply; decoupling required within 10 mm of pins to maintain signal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent 4-Bit Groups | Enables selective enabling of address vs. data lanes or clock vs. control signals on shared buses without inter-group crosstalk. |
| Extended Temperature Qualification | JEDEC-tested reliability over –55°C to 125°C ensures uninterrupted operation in avionics, motor drives, and oilfield electronics. |
| 5.5 V-Tolerant Inputs | Allows direct connection to 5-V I/O banks of FPGAs or microcontrollers even when VCC is at minimum 4.5 V - eliminates level-shifter components. |
| Controlled Baseline Manufacturing | Single assembly/test site and fabrication site guarantee consistent parametric performance and long-term supply continuity for mission-critical programs. |
| Low Dynamic Power | Typical ICC of 4 µA at 25°C enables low-quiescent-power standby modes in battery-backed or energy-sensitive systems. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory in ruggedized data acquisition systems. IC Role / Device Role / Timing Role: Noninverting buffer isolating MCU address pins from capacitive bus load while maintaining setup/hold timing margins. Use Value: 9.5 ns max tpd ensures sub-100 MHz address strobe timing compliance; ±24 mA drive sustains signal integrity across 10 cm PCB traces. | Use Scenario: Distributing a system clock to multiple peripheral ICs (ADCs, DACs, UARTs) in a radiation-hardened telemetry module. IC Role / Device Role / Timing Role: Fan-out buffer replicating clock signal with matched propagation delay across all eight outputs. Use Value: Tight tPLH/tPHL matching (≤1 ns variation) minimizes skew between clock destinations; 3-state capability allows dynamic clock gating. |
| Industrial Bus Transceiver Interface | Legacy System Signal Conditioning |
Use Scenario: Interfacing a PLC CPU's local bus to isolated I/O modules via optocoupled backplane links. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling time-multiplexed read/write cycles using OE-controlled 3-state handshaking. Use Value: Dual OE inputs permit independent control of input vs. output directions; ±24 mA drive overcomes optocoupler input capacitance. | Use Scenario: Upgrading aging 74LS244-based instrumentation control panels to modern 74ACT speed and drive without board redesign. IC Role / Device Role / Timing Role: Pin-compatible replacement delivering faster switching, lower power, and wider voltage margin than LS-series predecessors. Use Value: Identical SOIC-20 DW footprint and pinout; TTL-compatible inputs eliminate adapter logic; 4.5–5.5 V range accommodates aging power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT244MNSREP | SOP-20 (NS) package; identical electrical specs but different thermal resistance (θJA = 60°C/W vs. 58°C/W). | Preferred for surface-mount layouts requiring slightly larger pad pitch or alternate reflow profile compatibility. | Select when SOP-20 footprint is standardized in design; verify thermal derating for >100 mW dissipation. |
| SN74ACT244IDWREP | Same SOIC-20 DW package but rated for –40°C to 85°C industrial temperature range. | Targeted at commercial/industrial systems where extended temperature is not required. | Choose for cost-sensitive applications with ambient constraints below 85°C; retains full pin and logic compatibility. |
Compared with SN74ACT244MNSREP and SN74ACT244IDWREP, SN74ACT244MDWREP uniquely combines SOIC-20 mechanical compatibility with full military-grade temperature qualification (–55°C to 125°C), making it the only option for high-reliability embedded systems requiring both form-factor consistency and extreme environmental resilience.
Availability
SN74ACT244MDWREP is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial bus interfaces, and legacy system upgrades requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ACT244MDWREP 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 high-reliability electronics.
The SN74ACT244-EP product line delivers enhanced plastic packaged logic devices engineered for aerospace, defense, and industrial applications demanding extended temperature operation, controlled manufacturing baselines, and long-term supply assurance.
FAQ
What is the operating temperature range for SN74ACT244MDWREP?
SN74ACT244MDWREP is qualified for continuous operation from –55°C to 125°C, meeting JEDEC standards for high-reliability applications including avionics, downhole tools, and motor control systems. This rating is verified through HAST, temperature cycling, and electromigration testing - not derived from extrapolation or derating.
Does SN74ACT244MDWREP support 3.3-V logic inputs?
SN74ACT244MDWREP does not guarantee reliable operation with 3.3-V logic inputs because its input thresholds are TTL-defined (VIH = 2.0 V min, VIL = 0.8 V max) and optimized for 5-V systems. While 3.3-V CMOS outputs may exceed VIH under some conditions, TI specifies no guaranteed switching behavior below 4.5 V VCC - use SN74LVC244A for true 3.3-V compatibility.
How should unused inputs be handled on SN74ACT244MDWREP?
All unused inputs on SN74ACT244MDWREP must be tied to either VCC or GND to prevent floating nodes that cause increased ICC, oscillation, or ESD susceptibility. TI recommends using 10-kΩ pullup/pulldown resistors for unused A inputs and OE pins - this practice is documented in application report SCBA004 and validated across extended temperature operation.
Is SN74ACT244MDWREP pin-compatible with standard SN74ACT244 variants?
Yes, SN74ACT244MDWREP shares identical pinout, logic function, and SOIC-20 DW package dimensions with commercial SN74ACT244 and automotive SN74ACT244-Q1 variants. The "M" suffix denotes military-temperature qualification, not pinout deviation - all 20 pins retain identical terminal assignments and electrical roles per TI's SCAS724B datasheet.
What is the recommended power-up sequencing for SN74ACT244MDWREP?
TI recommends tying 1OE and 2OE to VCC through ≥10-kΩ pullup resistors to ensure outputs remain in high-impedance state during power-up. This prevents bus contention before system controllers initialize. VCC must ramp monotonically; no reverse bias or undershoot beyond –0.5 V is allowed per absolute maximum ratings.
SN74ACT244MDWREP 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ACT244MDWREP FAQ
1.How can I place an order for SN74ACT244MDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244MDWREP 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 SN74ACT244MDWREP reliable?
The price and inventory of SN74ACT244MDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244MDWREP is usually 5 days.
3.What payment methods are accepted for SN74ACT244MDWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244MDWREP transactions.
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4.How is shipping managed for SN74ACT244MDWREP?
SN74ACT244MDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244MDWREP 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 SN74ACT244MDWREP?
For technical support, including SN74ACT244MDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244MDWREP requirements.
6.How does Aetrix verify that SN74ACT244MDWREP is sourced from the original manufacturer or authorized distributors?
All SN74ACT244MDWREP 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 SN74ACT244MDWREP meets industry standards.
7.What is the process for return or replacement of SN74ACT244MDWREP?
All SN74ACT244MDWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244MDWREP, 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 SN74ACT244MDWREP part is unused and in its original packaging.
Return procedure for SN74ACT244MDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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