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Texas Instruments SN74AHCT244N
- Part No.:
- SN74AHCT244N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AHCT244N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:5,815
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Product details
Overview
SN74AHCT244N from Texas Instruments is an octal 3-state buffer/driver IC designed for bus interface applications, featuring TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), 5-V supply operation, ±8 mA output drive, and 7.4 ns typical propagation delay at 15 pF load. It enables bidirectional voltage translation from 3.3-V logic to 5-V buses in PC and network switch systems.
For engineers reviewing the SN74AHCT244N datasheet, SN74AHCT244N pinout, SN74AHCT244N application, or SN74AHCT244N equivalent, key selection criteria include its dual 4-bit independent enable control, high-impedance outputs during power-up/down, latch-up immunity (>250 mA), and PDIP-20 package compatibility with legacy through-hole designs.
Technical Context
The SN74AHCT244N implements two independent 4-bit non-inverting buffers, each with dedicated output-enable (1OE, 2OE) inputs controlling high-impedance states. Its CMOS design ensures balanced rise/fall times and low output ringing-critical for noise-sensitive bus environments.
It operates within 4.5 V–5.5 V supply range and –40°C to +85°C ambient temperature, with input tolerance up to 5.5 V regardless of VCC. The device meets JESD17 latch-up requirements and supports TTL-level signaling while delivering CMOS-level noise margins and power efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V rails with ±10% tolerance. |
| Input Voltage Compatibility | TTL-compatible: VIH = 2 V min, VIL = 0.8 V max - Directly interfaces with legacy 3.3-V and 5-V TTL logic without level shifters. |
| Output Drive | ±8 mA at VCC = 4.5 V - Sufficient for driving standard 50-pF bus loads while limiting ground bounce and EMI. |
| Propagation Delay | 7.4 ns typical (A→Y, CL = 15 pF) - Enables reliable timing in sub-100-MHz digital control and address/data bus applications. |
| 3-State Enable Time | tPZH = 10 ns max (OE→Y, CL = 15 pF) - Supports fast bus arbitration and multi-master contention management. |
| Latch-Up Immunity | >250 mA per JESD17 - Guarantees robustness against transient current surges in shared-bus environments. |
| ESD Rating | ±2000 V HBM - Meets standard handling requirements for automated assembly and field service. |
Pinout & Package
SN74AHCT244N uses a 20-pin plastic dual in-line package (PDIP-N), with 24.33 mm × 9.4 mm footprint and 25.40 mm × 6.35 mm body size. Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - Independently disable Group 1 (pins 2,4,6,8 → 18,16,14,12) or Group 2 (pins 11,13,15,17 → 3,5,7,9). |
| 2,4,6,8,11,13,15,17 | 1A1–1A4, 2A1–2A4 | Buffer inputs - Accept TTL/CMOS logic levels; overvoltage tolerant up to 5.5 V. |
| 3,5,7,9,12,14,16,18 | 2Y4–2Y1, 1Y4–1Y1 | 3-state outputs - High-impedance when respective OE is high; drive ±8 mA when enabled. |
| 10 | GND | Ground reference - Must be connected to system common; decoupling capacitor recommended adjacent to pin. |
| 20 | VCC | Power supply - Requires local 0.1 µF ceramic bypass capacitor; supports 4.5–5.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| Slow edge rate control | Minimizes output ringing and overshoot on unterminated PCB traces - critical for clean signal integrity in compact layouts. |
| Dual independent 3-state groups | Enables selective bus isolation - e.g., separate memory address vs. data paths without external gating logic. |
| TTL-input compatibility | Accepts 3.3-V logic high (≥2 V) directly into 5-V system - eliminates need for discrete level-shifting components. |
| Power-up/down high-impedance default | Outputs remain Hi-Z until OE is actively pulled low - prevents bus contention during reset or brownout conditions. |
| Low static current | ICC ≤ 40 µA max at VCC = 5.5 V - Reduces quiescent power in always-on subsystems such as BIOS configuration buses. |
Applications
| PC Memory Address Buffering | Industrial Network Switch Control Bus |
|---|---|
|
Use Scenario: Driving 5-V address lines from 3.3-V microcontroller GPIO in legacy desktop motherboard designs. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer with independent group enables - isolates CPU from memory controller during DMA cycles. Use Value: Eliminates need for discrete pull-ups or translators; maintains <7.5 ns timing margin for 100-MHz front-side bus addressing. |
Use Scenario: Isolating configuration registers between FPGA management core and PHY control bus in Ethernet switches. IC Role / Device Role / Timing Role: Bidirectional bus driver with controlled slew rate - prevents reflection-induced CRC errors on 10-cm backplane traces. Use Value: Delivers deterministic 3-state transition (<12 ns) enabling synchronized register access across multiple PHYs without arbitration logic. |
| Wearable Health Sensor Hub Interface | Test & Measurement Equipment I/O Expansion |
|
Use Scenario: Level-translating sensor ADC outputs (3.3-V SPI) to 5-V data acquisition module in portable ECG monitors. IC Role / Device Role / Timing Role: Input-tolerant buffer with low ICC - preserves battery life while ensuring logic-level compatibility. Use Value: Supports 0.8–2.0 V input thresholds across temperature, enabling reliable communication even with aging lithium battery voltage droop. |
Use Scenario: Expanding GPIB or parallel port handshaking signals in automated test equipment rack controllers. IC Role / Device Role / Timing Role: Octal driver with latch-up immunity - withstands repeated hot-plug events and probe contact bounce. Use Value: >250 mA JESD17 rating protects against accidental short-circuits during lab reconfiguration without fuse replacement. |
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 | 3.3-V only supply (1.65–3.6 V); lower drive (±24 mA); faster tPLH (3.5 ns typ) | Requires level-shifting for 5-V systems; optimized for modern low-voltage FPGAs and SoCs | Select when migrating to 3.3-V-only infrastructure and higher-speed timing budgets allow. |
| 74ACT244PC | Same PDIP-20 package; higher drive (±24 mA); wider VCC range (4.5–5.5 V); no TTL input compatibility | Needs external pull-ups for 3.3-V inputs; better for high-fanout 5-V buses with aggressive loading | Choose for legacy 5-V-only systems where input voltage matching is handled externally and drive strength is prioritized. |
Compared with SN74AHCT244N, SN74LVC244APWR offers superior speed and lower voltage operation but lacks native 5-V tolerance, while 74ACT244PC delivers stronger drive in identical packaging but requires additional interface conditioning for mixed-voltage use - making SN74AHCT244N the optimal choice for robust 3.3-V-to-5-V bridging in industrial and computing applications.
Availability
SN74AHCT244N is available at Aetrix Electronics and suitable for PC motherboards, industrial network switches, wearable health sensor hubs, and automated test equipment requiring stable component supply with long-term obsolescence management.
Supply support for SN74AHCT244N 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 industrial, automotive, and computing electronics.
The SNx4AHCT family was engineered for reliable 3.3-V/5-V bus interfacing in cost-sensitive, noise-prone environments - emphasizing TTL compatibility, latch-up immunity, and predictable 3-state behavior in legacy and hybrid voltage systems.
FAQ
What is the maximum operating temperature for SN74AHCT244N?
The SN74AHCT244N is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in PC chassis, network switch enclosures, and portable medical devices without forced cooling. Thermal derating is not required below 85°C, and the device maintains full electrical specifications across this span per TI's recommended operating conditions table.
Does SN74AHCT244N support 3.3-V input signals directly?
Yes, SN74AHCT244N accepts 3.3-V logic-high inputs directly due to its TTL-compatible input thresholds: VIH = 2.0 V minimum and VIL = 0.8 V maximum. Inputs tolerate up to 5.5 V regardless of VCC, enabling safe interfacing with 3.3-V microcontrollers, FPGAs, or sensors without external level shifters or resistive dividers.
Can SN74AHCT244N drive a 50-pF capacitive load reliably?
Yes, SN74AHCT244N is characterized for 50-pF loads: tPLH/tPHL = 9.5 ns max, tPZH/tPZL = 13 ns max, and tPHZ/tPLZ = 13 ns max at VCC = 5 V. These values ensure timing compliance in dense PCB layouts with stubbed traces or multi-drop buses, provided layout follows TI's guidelines - including local bypassing and controlled trace impedance.
Is SN74AHCT244N pin-compatible with other AHCT-series octal buffers?
Yes, SN74AHCT244N shares identical pinout and function mapping with all SNx4AHCT244 variants in PDIP-20 packaging, including SN74AHCT244N.A and military-grade SNJ54AHCT244J. Functional equivalence extends to SOIC (DW), SSOP (DB), and TSSOP (PW) packages - though mechanical dimensions and thermal characteristics differ by package type.
What is the purpose of the two separate output-enable pins on SN74AHCT244N?
The two independent output-enable pins (1OE and 2OE) allow selective activation of two distinct 4-bit buffer groups: Group 1 (1A1–1A4 → 1Y1–1Y4) and Group 2 (2A1–2A4 → 2Y1–2Y4). This enables simultaneous control of separate data paths - such as address vs. control lines - without adding external logic, reducing gate count and board space in bus-isolation applications.
SN74AHCT244N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AHCT244N FAQ
1.How can I place an order for SN74AHCT244N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244N 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 SN74AHCT244N reliable?
The price and inventory of SN74AHCT244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244N is usually 5 days.
3.What payment methods are accepted for SN74AHCT244N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT244N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT244N?
SN74AHCT244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244N 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 SN74AHCT244N?
For technical support, including SN74AHCT244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244N requirements.
6.How does Aetrix verify that SN74AHCT244N is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244N 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 SN74AHCT244N meets industry standards.
7.What is the process for return or replacement of SN74AHCT244N?
All SN74AHCT244N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244N, 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 SN74AHCT244N part is unused and in its original packaging.
Return procedure for SN74AHCT244N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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