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Texas Instruments SN74AC244MDWREP
- Part No.:
- SN74AC244MDWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC244MDWREP.pdf
- Description:
- IC BUFF NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
SN74AC244MDWREP from Texas Instruments is an octal 3-state buffer/driver IC designed for memory address, clock, and bus interface applications. It operates from 2 V to 6 V, supports input voltages up to 6 V, delivers ≤7.5 ns propagation delay at 5 V, and functions across –55°C to 125°C for aerospace and industrial systems.
For engineers reviewing the SN74AC244MDWREP datasheet, SN74AC244MDWREP pinout, SN74AC244MDWREP application, or SN74AC244MDWREP equivalent, key selection criteria include its dual 4-bit independent enable architecture, SOIC-20 package with 1.27 mm pitch, high-impedance output control timing, and extended temperature reliability for mission-critical signal routing.
Technical Context
The SN74AC244MDWREP implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) inputs-1OE controls Y1–Y4, 2OE controls Y5–Y8. Its AC logic family ensures TTL-compatible input thresholds and CMOS-level output drive strength.
It features rail-to-rail input voltage tolerance (up to VCC + 0.5 V), ±24 mA output drive capability at 5.5 V, and guaranteed high-impedance state during power sequencing when OE is pulled high. No internal clamping diodes are required due to inherent input overvoltage resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V bus) |
| tpd Max | 7.5 ns at 5 V - enables reliable operation in high-speed address/data strobing up to ~130 MHz |
| IOL/IOH | ±24 mA at 5.5 V - drives standard TTL loads or multiple CMOS inputs without external buffering |
| Operating Temp | –55°C to 125°C - qualified per MIL-PRF-38535 and JESD22 for space-grade and downhole electronics |
| Input Voltage | Valid up to VCC + 0.5 V - accepts 5 V signals into 3.3 V systems without level shifters |
| IOZ (Off-State) | ±0.25 µA max at 5.5 V - minimizes leakage-induced bus contention in powered-down subsystems |
Pinout & Package
SN74AC244MDWREP uses a 20-pin SOIC (DW) package with 1.27 mm pitch, 7.6 mm body width, and 2.65 mm max height-compatible with IPC-7351 SOIC-20 footprint DW0020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of first/second 4-bit buffer group; must be pulled high via resistor for safe power-up high-Z |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective Y outputs; tolerate 0–6 V regardless of VCC |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Driven low/high when OE low; high-impedance when OE high - enables shared bus arbitration |
| VCC, GND | Power supply | Single-supply operation; decoupling capacitor required within 10 mm of pins 10 and 20 |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Support | Qualified from –55°C to 125°C per JEDEC JESD22-A108, including HAST, temperature cycling, and intermetallic life testing |
| Input Overvoltage Tolerance | Accepts inputs up to 6 V on any pin - eliminates need for external level translators in mixed-voltage backplanes |
| Controlled Baseline Manufacturing | Single assembly/test site and single fabrication site - ensures consistent parametric distribution and long-term supply stability |
| Low Propagation Delay | 7.5 ns max at 5 V - meets timing budgets for 32-bit address latching in FPGA configuration interfaces |
| High-Drive 3-State Outputs | ±24 mA drive at 5.5 V - directly interfaces with terminated transmission lines or legacy TTL loads |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 32-bit address lines from an FPGA to SRAM or Flash memory in a radiation-tolerant avionics module. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating address bus during memory read/write cycles; enables time-multiplexed access across multiple memory banks. Use Value: 7.5 ns tpd ensures setup/hold compliance at 80 MHz clock rates; extended temp rating maintains timing integrity under thermal cycling. | Use Scenario: Level-shifting and bus-driving between a 3.3 V microcontroller and a 5 V industrial CAN transceiver or analog I/O expander. IC Role / Device Role / Timing Role: Voltage-tolerant buffer providing bidirectional signal conditioning on shared control/data lines with configurable enable timing. Use Value: Input acceptance up to 6 V allows direct connection to 5 V peripherals; ±24 mA drive sustains signal integrity over 15 cm PCB traces. |
| Clock Distribution Fanout | FPGA Configuration Interface |
Use Scenario: Distributing a 50 MHz system clock from a PLL to eight synchronous logic blocks in a high-reliability test equipment controller. IC Role / Device Role / Timing Role: Low-skew fanout buffer with independent enable control per group - allows dynamic clock gating per subsystem. Use Value: Matched tPLH/tPHL (≤9 ns variation) minimizes clock skew; high-Z state prevents loading during sleep mode. | Use Scenario: Isolating FPGA configuration data (CCLK, DIN, INIT_B) from host processor during hot-swap or reconfiguration sequences. IC Role / Device Role / Timing Role: 3-state interface buffer enabling clean handoff between configuration controller and FPGA I/O banks. Use Value: Guaranteed high-impedance on power-up (via OE pull-up) prevents bus contention before FPGA initialization completes. |
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 |
|---|---|---|---|
| SN74LVC244A | Lower VCC range (1.65–3.6 V); 3.3 V only; 3.7 ns tpd at 3.3 V | Not rated beyond 125°C; unsuitable for extended-temp environments | Select for cost-sensitive commercial designs where 3.3 V operation and speed outweigh temperature requirements |
| SN54AC244 | Same AC logic family and pinout; military QML-38535 Class V rated; identical electrical specs | Requires MIL-spec screening and traceability; higher unit cost and longer lead times | Select when full military qualification (including burn-in and lot traceability) is mandated by program requirements |
Compared with SN74LVC244A and SN54AC244, the SN74AC244MDWREP uniquely balances extended temperature operation, 2–6 V flexibility, and controlled baseline manufacturing-making it optimal for high-integrity industrial and space-qualified systems where both performance and supply chain continuity are critical.
Availability
SN74AC244MDWREP is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interfacing, clock distribution, and FPGA configuration isolation requiring stable component supply across extended temperature ranges.
Supply support for SN74AC244MDWREP 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 high-reliability logic solutions with over 50 years of aerospace and defense component heritage.
The SN74AC244-EP product line delivers radiation-tolerant, extended-temperature octal buffers for mission-critical signal routing in avionics, downhole tools, and hardened industrial controllers.
FAQ
What is the maximum operating voltage for SN74AC244MDWREP?
The SN74AC244MDWREP supports a supply voltage range of 2 V to 6 V. Its inputs tolerate voltages up to VCC + 0.5 V, allowing 5 V signals to be safely applied even when VCC = 3.3 V. This rail-to-rail input compatibility eliminates external level shifters in mixed-voltage systems and is verified across the full –55°C to 125°C operating range.
How does SN74AC244MDWREP ensure safe power-up behavior?
The SN74AC244MDWREP requires OE pins to be tied to VCC via a pull-up resistor to guarantee high-impedance outputs during power-up and power-down transitions. The minimum resistor value depends on the driver's current-sinking capability, and TI recommends values between 4.7 kΩ and 10 kΩ. This design prevents bus contention before system control logic initializes - a critical requirement in FPGA and microcontroller boot sequences.
Is SN74AC244MDWREP pin-compatible with standard SN74AC244 variants?
Yes, SN74AC244MDWREP shares identical pinout, logic function, and electrical specifications with the commercial SN74AC244 and automotive SN74AC244-Q1 in the same SOIC-20 (DW) package. Differences are limited to enhanced reliability screening, extended temperature qualification, and controlled baseline manufacturing - not pin assignment or signal behavior.
What thermal considerations apply to SN74AC244MDWREP in high-density layouts?
SN74AC244MDWREP has a θJA of 58°C/W in the SOIC-20 DW package. At 24 mA output drive and 5.5 V VCC, worst-case power dissipation per buffer is ~132 mW. For eight active buffers, total die power may reach ~1.06 W - requiring ≥250 mm² copper pour under the package and placement away from heat sources to maintain junction temperature below 150°C at 125°C ambient.
Does SN74AC244MDWREP support hot-insertion or live insertion?
SN74AC244MDWREP is not explicitly rated for hot-insertion, but its absolute maximum ratings include VI and VO limits of –0.5 V to VCC + 0.5 V and ±20 mA clamp current - enabling robustness against transient overvoltage during insertion. Safe live insertion requires external series resistors (≥10 Ω) on all I/O lines and controlled ramp-up of VCC and OE, as outlined in TI application report SCBA004.
SN74AC244MDWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AC244MDWREP FAQ
1.How can I place an order for SN74AC244MDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC244MDWREP 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 SN74AC244MDWREP reliable?
The price and inventory of SN74AC244MDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC244MDWREP is usually 5 days.
3.What payment methods are accepted for SN74AC244MDWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC244MDWREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC244MDWREP?
SN74AC244MDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC244MDWREP 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 SN74AC244MDWREP?
For technical support, including SN74AC244MDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC244MDWREP requirements.
6.How does Aetrix verify that SN74AC244MDWREP is sourced from the original manufacturer or authorized distributors?
All SN74AC244MDWREP 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 SN74AC244MDWREP meets industry standards.
7.What is the process for return or replacement of SN74AC244MDWREP?
All SN74AC244MDWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC244MDWREP, 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 SN74AC244MDWREP part is unused and in its original packaging.
Return procedure for SN74AC244MDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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