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Texas Instruments SN74AHC244DWRE4
- Part No.:
- SN74AHC244DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC244DWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,467
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Product details
Overview
SN74AHC244DWRE4 from Texas Instruments is an octal non-inverting 3-state buffer/driver IC designed for bus-oriented memory address, clock, and data line driving in high-density digital systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, supports 10 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and features dual independent 4-bit banks with separate 3-state enable controls - used in PC motherboard I/O expansion and industrial backplane interfaces.
For engineers reviewing the SN74AHC244DWRE4 datasheet, SN74AHC244DWRE4 pinout, SN74AHC244DWRE4 application, or SN74AHC244DWRE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, rail-to-rail input tolerance up to 5.5 V, balanced CMOS push-pull/3-state outputs, and compatibility with mixed-voltage bus translation in embedded control and test equipment.
Technical Context
The SN74AHC244DWRE4 implements two independent 4-bit non-inverting buffer banks, each controlled by a dedicated output-enable input (1OE, 2OE). Each bank drives four outputs (e.g., 1Y1–1Y4, 2Y1–2Y4) with identical logic function Yn = An, enabling simultaneous bidirectional bus isolation or unidirectional signal fan-out.
Its CMOS architecture provides rail-to-rail input voltage tolerance (VI up to 5.5 V regardless of VCC), balanced sourcing/sinking capability (±8 mA at 5 V), and fast switching (tPLH/tPHL ≤ 6.5 ns at VCC = 5 V, CL = 15 pF), making it suitable for high-speed, low-noise digital interface buffering where timing integrity and drive strength are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V logic domains, enabling voltage-level translation without external level shifters. |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive 50 pF loads over 12 cm PCB traces while maintaining signal integrity under typical bus loading. |
| Propagation Delay | ≤6.5 ns (tPLH/tPHL, VCC = 5 V, CL = 15 pF) - ensures sub-10 ns timing margins for 100 MHz synchronous bus applications. |
| Input Voltage Tolerance | VI up to 5.5 V at any valid VCC - allows interfacing with higher-voltage peripherals while powered from lower VCC (e.g., 3.3 V supply with 5 V-tolerant inputs). |
| 3-State Leakage | ±2.5 µA (IOZ, VCC = 5.5 V) - minimizes bus contention current when outputs are disabled, critical for hot-swap and multi-driver bus architectures. |
| ESD Rating | ±2000 V HBM - meets industrial-grade ESD robustness requirements for assembly and field operation without additional protection circuitry. |
| Operating Temperature | –40 °C to +125 °C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
The SN74AHC244DWRE4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body: 12.8 mm × 7.5 mm), with gull-wing leads and standard JEDEC MS-013 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - independently disable Bank 1 (pins 2,4,6,8 → 18,16,14,12) or Bank 2 (pins 11,13,15,17 → 3,5,7,9). |
| 2,4,6,8 | 1A1–1A4 | Bank 1 input signals - routed directly to corresponding 1Y outputs when 1OE = L; high-impedance when 1OE = H. |
| 11,13,15,17 | 2A1–2A4 | Bank 2 input signals - routed to 2Y outputs (pins 3,5,7,9) only when 2OE = L; otherwise high-Z. |
| 12,14,16,18 | 1Y1–1Y4 | Bank 1 buffered non-inverting outputs - drive external loads with CMOS-compatible levels and ±8 mA capability. |
| 3,5,7,9 | 2Y1–2Y4 | Bank 2 buffered non-inverting outputs - electrically isolated from Bank 1, supporting independent bus segments. |
| 10 | GND | Ground reference - must be connected to system ground plane; decoupling capacitor (0.1 µF) placed adjacent to pin 10 and pin 20. |
| 20 | VCC | Power supply - accepts 2–5.5 V; requires local 0.1 µF ceramic bypass capacitor between pins 20 and 10. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input tolerance | Inputs accept up to 5.5 V regardless of VCC setting - enables down-translation (e.g., 5 V inputs into 3.3 V system) without external clamping or level shifters. |
| Dual independent 3-state banks | Separate OE controls (1OE, 2OE) allow selective isolation of two 4-bit data paths - essential for multiplexed address/data buses and hot-plug peripheral interfaces. |
| Balanced CMOS push-pull outputs | Symmetric ±8 mA drive at 5 V ensures matched rise/fall times (<10% skew) and reduces ground bounce in high-speed switching. |
| Low dynamic power dissipation | 8.6 pF typical Cpd - limits switching current and heat generation in high-frequency operation, improving thermal margin in dense layouts. |
| Industrial temperature range | –40 °C to +125 °C operation - validated for use in programmable logic controllers, motor drives, and network infrastructure equipment. |
Applications
| PC Motherboard I/O Expansion | Industrial Backplane Bus Interface |
|---|---|
|
Use Scenario: Buffering ISA/PCIe legacy I/O address and control lines between southbridge and add-in cards. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating shared address/data bus segments during card insertion/removal. Use Value: Prevents bus contention via independent OE control; ±8 mA drive maintains signal integrity over 10 cm backplane traces at 33 MHz. |
Use Scenario: Driving parallel control signals (e.g., enable, reset, status) across modular PLC chassis backplanes. IC Role / Device Role / Timing Role: Octal driver translating microcontroller GPIO to robust 5 V CMOS levels for noise-immune inter-module communication. Use Value: Rail-to-rail input tolerance accepts 3.3 V MCU outputs while driving 5 V logic; 125 °C rating ensures reliability in enclosed enclosures. |
| Test Equipment Signal Routing | Wearable Health Data Acquisition |
|
Use Scenario: Multiplexing sensor excitation and analog front-end control signals in automated test systems with multiple DUT interfaces. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling one controller to sequentially access multiple sensor modules via shared control lines. Use Value: Dual OE pins allow precise timing of signal routing windows; <6.5 ns propagation delay supports 100 MHz test pattern rates. |
Use Scenario: Isolating low-power MCU GPIO from higher-current display backlight drivers and sensor interface circuits in compact wearables. IC Role / Device Role / Timing Role: Level-shifting buffer enabling 1.8 V/3.3 V MCU to safely drive 5 V display logic without voltage translators. Use Value: 5.5 V-tolerant inputs eliminate external level shifters; SOIC-DW package fits space-constrained flex-rigid PCBs with 0.1 µF bypass integration. |
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 | Lower VCC range (1.65–3.6 V); 24 mA drive at 3.3 V; 3.3 V-only input tolerance. | Optimized for 3.3 V-only systems; not suitable for mixed 5 V/3.3 V bus translation. | Select when operating exclusively at 3.3 V and higher drive strength is required; verify compatibility with existing 5 V signal sources. |
| 74AHC244D,653 | NXP variant in SO20 package; identical AHC logic family specs but different qualification (JEDEC vs. TI's SCLS226N). | Same functional behavior and pinout; minor differences in thermal metrics (RθJA = 85 °C/W vs. TI's 81.1 °C/W). | Acceptable drop-in alternative for cost-sensitive industrial designs where TI-specific qualification is not mandated. |
Compared with SN74AHC244DWRE4, SN74LVC244APWR offers higher drive but narrower voltage range, limiting mixed-voltage use; 74AHC244D,653 matches functionality and pinout but has slightly higher thermal resistance, requiring margin in thermally constrained layouts.
Availability
SN74AHC244DWRE4 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial backplane bus interfaces, and wearable health data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC244DWRE4 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 expertise in high-reliability logic families and industrial-grade qualification.
The SN74AHC244DWRE4 belongs to TI's AHC (Advanced High-Speed CMOS) logic series, engineered for high-speed, low-power bus interface applications in industrial automation, computing, and test equipment where timing precision and voltage flexibility are critical.
FAQ
What is the maximum input voltage allowed on SN74AHC244DWRE4 pins?
The SN74AHC244DWRE4 supports input voltages up to 5.5 V on all pins, regardless of VCC level - enabling direct interfacing with 5 V peripherals while operating from a 3.3 V supply. This rail-to-rail input tolerance eliminates the need for external level-shifting components in mixed-voltage systems and is verified per TI's SCLS226N datasheet Section 5.3.
Does SN74AHC244DWRE4 support hot-swap operation?
Yes, the SN74AHC244DWRE4 supports hot-swap operation through its dual independent 3-state enable inputs (1OE and 2OE), which allow controlled assertion and deassertion of output drivers during live insertion. Its ±2.5 µA high-impedance leakage (IOZ) and ±2000 V HBM ESD rating further ensure robustness during plug-in events in backplane and modular systems.
What is the recommended bypass capacitor for SN74AHC244DWRE4?
A 0.1 µF ceramic capacitor is recommended between VCC (pin 20) and GND (pin 10) for the SN74AHC244DWRE4, placed as close as possible to the device pins. TI's datasheet Section 8.3 specifies this value to suppress high-frequency noise and maintain stable supply during fast output transitions, especially critical given its ±8 mA drive capability and sub-10 ns switching.
Can SN74AHC244DWRE4 drive 50 pF loads reliably at 5 V supply?
Yes, the SN74AHC244DWRE4 is characterized to drive 50 pF loads with tPLH/tPHL ≤ 8.5 ns at VCC = 5 V (Section 5.7), and its ±8 mA output current ensures adequate slew rate and signal integrity. Layout guidelines in Section 8.4 recommend source termination and controlled-impedance traces for lengths >12 cm to prevent ringing - confirmed in TI's Figure 8-2 simulation data.
How are the two banks of SN74AHC244DWRE4 configured and controlled?
The SN74AHC244DWRE4 contains two independent 4-bit banks: Bank 1 (inputs 1A1–1A4 on pins 2,4,6,8; outputs 1Y1–1Y4 on pins 18,16,14,12) and Bank 2 (inputs 2A1–2A4 on pins 11,13,15,17; outputs 2Y1–2Y4 on pins 3,5,7,9). Each bank is enabled separately by 1OE (pin 1) and 2OE (pin 19), both active-low - allowing selective bus isolation without affecting the other bank.
SN74AHC244DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC244DWRE4 FAQ
1.How can I place an order for SN74AHC244DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244DWRE4 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 SN74AHC244DWRE4 reliable?
The price and inventory of SN74AHC244DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244DWRE4 is usually 5 days.
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SN74AHC244DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244DWRE4 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 SN74AHC244DWRE4?
For technical support, including SN74AHC244DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244DWRE4 requirements.
6.How does Aetrix verify that SN74AHC244DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244DWRE4 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 SN74AHC244DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHC244DWRE4?
All SN74AHC244DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244DWRE4, 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 SN74AHC244DWRE4 part is unused and in its original packaging.
Return procedure for SN74AHC244DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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