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Texas Instruments SN74AHCT244DGVR
- Part No.:
- SN74AHCT244DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244DGVR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,913
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Product details
Overview
SN74AHCT244DGVR from Texas Instruments is an octal 3-state buffer/driver IC designed for bus interface applications, featuring TTL-compatible inputs, 5-V supply operation, ±8-mA output drive, 8.5-ns typical propagation delay (CL = 15 pF), and TVSOP-20 packaging. It enables bidirectional data buffering in memory address paths, clock distribution, and peripheral I/O expansion.
For engineers reviewing the SN74AHCT244DGVR datasheet, SN74AHCT244DGVR pinout, SN74AHCT244DGVR application, or SN74AHCT244DGVR equivalent, key selection criteria include 3.3-V-to-5-V level translation capability, low-output ringing due to controlled edge rates, high-impedance output enable control, and compatibility with industrial temperature range (–40°C to +85°C) systems requiring reliable bus isolation.
Technical Context
The SN74AHCT244DGVR implements two independent 4-bit noninverting buffers, each with dedicated 3-state output-enable (1OE, 2OE) inputs. Its CMOS design accepts TTL-level inputs (VIH = 2 V, VIL = 0.8 V) while operating from a single 4.5–5.5-V supply, enabling seamless interfacing between 3.3-V logic and 5-V buses.
Each buffer section drives up to ±8 mA at VOH ≥ 3.8 V and VOL ≤ 0.44 V under load, with propagation delays tightly specified (tPLH/tPHL ≤ 8.5 ns at CL = 15 pF). The device exhibits low dynamic power consumption (Cpd = 8.2 pF) and robust ESD immunity (±2000 V HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances and brown-out resilience. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - allows direct connection to legacy 3.3-V or 5-V TTL outputs without level-shifting circuitry. |
| Output Drive | ±8 mA - sufficient to drive standard CMOS loads and moderate PCB trace capacitance without signal integrity degradation. |
| Propagation Delay | ≤ 8.5 ns (CL = 15 pF) - supports high-speed bus timing in PCs, network switches, and test equipment with tight setup/hold margins. |
| 3-State Leakage | ±2.5 µA - guarantees minimal bus contention current when outputs are disabled, critical for multi-driver shared-bus reliability. |
| Operating Temperature | –40°C to +85°C - validated for industrial-grade embedded systems including power infrastructure and wearable health devices. |
| ESD Rating | ±2000 V HBM - meets JEDEC JS-001 requirements for robust handling in automated assembly and field-replaceable modules. |
Pinout & Package
SN74AHCT244DGVR uses a 20-pin Thin Very Small Outline Package (TVSOP) with 0.5-mm pitch, 5.00 mm × 6.4 mm body size, and exposed pad-less construction suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for respective 4-bit buffer groups - tying high disables outputs into high-impedance state for bus sharing. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL-compatible signals; unused inputs must be tied to VCC or GND to prevent floating-induced noise. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Noninverting buffered outputs - drive external loads with controlled slew rate to minimize overshoot/undershoot on transmission lines. |
| 10 | GND | Ground reference - requires low-inductance connection to system ground plane for stable switching performance and noise immunity. |
| 20 | VCC | 5-V power supply - must be decoupled with 0.1-µF ceramic capacitor placed adjacent to pin to suppress high-frequency supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-input compatibility | Accepts 2-V VIH and 0.8-V VIL thresholds - eliminates need for external level translators when interfacing with older microcontrollers or FPGAs. |
| Slow edge-rate control | Minimizes output ringing and EMI in high-speed digital interconnects - critical for clean signal integrity on long traces or unterminated buses. |
| Low quiescent current | ICC ≤ 40 µA - reduces static power draw in always-on subsystems such as sensor hubs and battery-backed peripherals. |
| High-impedance output state | IOZ ≤ ±2.5 µA - prevents bus contention during hot-swap or multi-master arbitration, ensuring safe shared-bus operation. |
| Industrial temperature range | Rated for –40°C to +85°C - qualified for deployment in power converters, industrial controllers, and portable medical electronics. |
Applications
| Network Switch Interface | PC Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating CPU address/data lines from multiple Ethernet PHYs and switch fabric ASICs in enterprise-grade Layer-2 switches. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing multiplexed address bus segments with precise timing control via OE pins. Use Value: Enables deterministic bus arbitration and eliminates signal reflection through controlled edge rates and low-output impedance during active drive. |
Use Scenario: Driving memory address lines from a northbridge controller to dual-channel DDR SDRAM modules in desktop motherboards. IC Role / Device Role / Timing Role: Noninverting buffer amplifying weak address signals while maintaining strict tPLH/tPHL ≤ 8.5 ns for synchronous memory access timing. Use Value: Ensures setup/hold margin compliance across temperature and voltage variations, preventing memory read/write errors at 200+ MHz clock rates. |
| Wearable Health Sensor Hub | Test & Measurement Equipment I/O Expansion |
|
Use Scenario: Interfacing low-power MCU GPIOs with multiple analog front-end sensors (ECG, SpO₂, IMU) in compact fitness trackers. IC Role / Device Role / Timing Role: Level-translating buffer converting 3.3-V MCU outputs to 5-V sensor supply domains while providing bus isolation. Use Value: Achieves reliable 3.3-V-to-5-V translation without external resistors or active translators, reducing BOM count and board area. |
Use Scenario: Expanding digital I/O channels on benchtop oscilloscopes and logic analyzers to support custom probe interfaces and calibration fixtures. IC Role / Device Role / Timing Role: High-reliability 3-state driver enabling hot-pluggable module detection and configuration via shared control bus. Use Value: Guarantees glitch-free bus transitions during module insertion/removal using OE-controlled high-Z state, preventing system lockup. |
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 |
|---|---|---|---|
| SN74AHCT244DWR | SOIC-20 package (12.8 mm × 7.5 mm), higher RθJA (81.1°C/W), same electrical specs and pinout. | Better thermal dissipation in forced-air environments; less suitable for ultra-dense portable designs. | Choose for ease of hand-soldering, prototyping, or legacy board compatibility where TVSOP reflow is unavailable. |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 24-mA drive, faster tPD (3.5 ns), but not TTL-input compatible. | Optimized for modern 3.3-V/2.5-V systems; cannot replace SN74AHCT244DGVR in mixed-voltage or legacy TTL interfaces. | Use only in new 3.3-V-only designs requiring higher speed and lower power; verify input threshold compatibility before substitution. |
Compared with SN74AHCT244DWR and SN74LVC244APWR, the SN74AHCT244DGVR uniquely balances TTL input compatibility, 5-V operation, compact TVSOP packaging, and industrial temperature rating-making it optimal for space-constrained, mixed-voltage industrial and computing applications where pin compatibility and proven reliability are mandatory.
Availability
SN74AHCT244DGVR is available at Aetrix Electronics and suitable for network switches, PC motherboard designs, and wearable health sensor hubs requiring stable component supply, full RoHS compliance, and guaranteed long-term manufacturability.
Supply support for SN74AHCT244DGVR 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 connectivity technologies, with over 90 years of innovation in high-reliability electronic components.
The SN74AHCT244DGVR belongs to TI's legacy logic portfolio, engineered for robust bus interface solutions in industrial, computing, and instrumentation applications where voltage translation, noise immunity, and long-lifecycle support are essential.
FAQ
What is the maximum output current per pin for SN74AHCT244DGVR?
The SN74AHCT244DGVR supports ±8 mA per output pin under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This rating ensures reliable drive capability into standard CMOS loads while maintaining VOL ≤ 0.44 V and VOH ≥ 3.8 V, as verified in TI's SCLS228O datasheet Section 5.5.
Does SN74AHCT244DGVR support 3.3-V input logic levels?
Yes, SN74AHCT244DGVR accepts 3.3-V TTL-compatible inputs: VIH = 2 V minimum and VIL = 0.8 V maximum, allowing direct connection to 3.3-V microcontrollers and FPGAs without level-shifting circuitry. This is explicitly confirmed in Section 5.3 (Recommended Operating Conditions) of the official datasheet.
What is the thermal resistance (RθJA) of SN74AHCT244DGVR in its TVSOP package?
The junction-to-ambient thermal resistance (RθJA) for SN74AHCT244DGVR in the TVSOP-20 (DGV) package is 119.2°C/W, as specified in Section 5.4 of the TI datasheet. This value assumes standard JEDEC 2-layer board conditions and informs thermal design for continuous operation within the –40°C to +85°C ambient range.
Can SN74AHCT244DGVR be used in automotive applications?
SN74AHCT244DGVR is a catalog-grade device rated for –40°C to +85°C and is not AEC-Q100 qualified. For automotive use, TI offers the pin-compatible SN74AHCT244-Q1 variant, which undergoes extended temperature testing (–40°C to +125°C) and qualification per automotive reliability standards. Substituting SN74AHCT244DGVR in automotive systems is not recommended.
How should unused inputs be handled on SN74AHCT244DGVR?
All unused inputs on SN74AHCT244DGVR must be tied to either VCC or GND to prevent floating states that cause increased ICC, noise coupling, or undefined logic behavior. TI recommends pullup/pulldown resistors (e.g., 10 kΩ) based on system noise environment, as detailed in Application Report SCBA004 and Section 8.3.1 of the datasheet.
SN74AHCT244DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74AHCT244DGVR FAQ
1.How can I place an order for SN74AHCT244DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244DGVR 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 SN74AHCT244DGVR reliable?
The price and inventory of SN74AHCT244DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244DGVR is usually 5 days.
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SN74AHCT244DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244DGVR 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 SN74AHCT244DGVR?
For technical support, including SN74AHCT244DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244DGVR requirements.
6.How does Aetrix verify that SN74AHCT244DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244DGVR 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 SN74AHCT244DGVR meets industry standards.
7.What is the process for return or replacement of SN74AHCT244DGVR?
All SN74AHCT244DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244DGVR, 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 SN74AHCT244DGVR part is unused and in its original packaging.
Return procedure for SN74AHCT244DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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