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Texas Instruments SN74F244DWG4
- Part No.:
- SN74F244DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74F244DWG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,788
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Product details
Overview
SN74F244DWG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address and bus driving in TTL-level digital systems. It features two independent 4-bit channels, active-low output-enable (OE) control per channel, 5 V nominal supply operation, and supports 0°C to 70°C industrial temperature range. It drives high-capacitance bus lines with 64 mA low-level output current and 12 mA high-level sink capability.
For engineers reviewing the SN74F244DWG4 datasheet, SN74F244DWG4 pinout, SN74F244DWG4 application, or SN74F244DWG4 equivalent, this page delivers verified electrical specs, SOIC-20 package layout, functional truth table, real-world use cases in legacy computing and industrial control buses, and validated alternative parts with documented differences in drive strength and temperature grading.
Technical Context
The SN74F244DWG4 implements dual 4-bit noninverting buffer architecture with separate 1OE and 2OE inputs enabling independent channel enable/disable. Each channel passes A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high - supporting bidirectional bus arbitration without external logic.
It operates strictly within TTL-compatible voltage thresholds: VIH ≥ 2 V, VIL ≤ 0.8 V, VOH ≥ 2.4 V (at IOH = −3 mA), VOL ≤ 0.55 V (at IOL = 64 mA). Propagation delays are tightly specified: tPLH/tPHL ≤ 6.2 ns, tPZL/tPLZ ≤ 8 ns (VCC = 4.5–5.5 V, CL = 50 pF), ensuring reliable timing in synchronous 5 V bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal noninverting 3-state buffer with dual independent OE controls |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails |
| Output Drive | 64 mA sink / 15 mA source - sufficient for driving 10+ TTL loads or 50 pF bus capacitance |
| Propagation Delay | ≤6.2 ns (A→Y), ≤8 ns (OE→Y transition) - enables >100 MHz bus clocking in short traces |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial embedded applications |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - ensures robust noise margin against TTL logic families |
| High-Z Leakage | ±50 µA - prevents unintended bus loading when disabled |
Pinout & Package
SN74F244DWG4 is packaged in a 20-pin SOIC (DW) body measuring 13.0 mm × 7.6 mm × 2.65 mm, with 1.27 mm lead pitch and RoHS-compliant NiPdAu lead finish. It conforms to JEDEC MS-013 and is rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 Output Enable (active-low) | Enables/disables Y1–Y4 outputs; low = pass A1–A4, high = high-Z |
| 1A1–1A4 | Channel 1 Input Lines | Noninverting data inputs for first 4-bit buffer group |
| 1Y1–1Y4 | Channel 1 Output Lines | Buffered noninverting outputs corresponding to 1A1–1A4 |
| GND (Pin 10) | Ground Reference | Primary return path for all I/O and supply currents |
| VCC (Pin 20) | Power Supply | 5 V DC supply input; bypass capacitor recommended at pin |
| 2OE | Channel 2 Output Enable (active-low) | Enables/disables Y5–Y8 outputs; independent of 1OE |
| 2A1–2A4 | Channel 2 Input Lines | Noninverting data inputs for second 4-bit buffer group |
| 2Y1–2Y4 | Channel 2 Output Lines | Buffered noninverting outputs corresponding to 2A1–2A4 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit channels | Enables selective bus isolation - e.g., CPU address vs. peripheral data paths |
| 3-State outputs with low-power disable | Reduces bus contention risk and system power during idle cycles |
| TTL-compatible input/output thresholds | Guarantees interoperability with legacy 74F, 74LS, and 74AS logic families |
| High drive strength (64 mA sink) | Supports fan-out to ≥10 standard TTL loads without external buffers |
| Fast propagation (≤6.2 ns) | Meets timing budgets for 20+ MHz parallel bus systems with minimal skew |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between microprocessor and SRAM/ROM in legacy industrial controllers. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address outputs from memory module inputs; 3-state allows shared bus access with DMA controller. Use Value: Prevents address line loading and timing violations; 64 mA drive sustains signal integrity across 10 cm PCB traces. | Use Scenario: Interfacing PLC backplane signals between CPU and I/O modules using parallel control bus. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling read/write handshaking via independent OE control per channel. Use Value: Dual OE pins allow precise timing of data direction changes without external gating logic. |
| Legacy Computer Expansion | Test Equipment Signal Routing |
Use Scenario: Expanding ISA bus slots in retro-computing test rigs requiring TTL-level address/data buffering. IC Role / Device Role / Timing Role: Octal buffer translating CPU address space to expansion card peripherals while maintaining signal edge rates. Use Value: ≤6.2 ns propagation delay preserves setup/hold margins for 8 MHz ISA timing. | Use Scenario: Multiplexing stimulus signals from pattern generator to multiple DUT inputs in automated test equipment. IC Role / Device Role / Timing Role: 3-state switch routing one of two 4-bit data sources to common test node under software control. Use Value: Independent OE pins enable glitch-free source switching without bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F244N | Same logic function, PDIP-20 package (13.97 mm width), through-hole mounting | Suitable for prototyping, breadboarding, or legacy wave-soldered assemblies | Select when manual assembly or socket-based testing is required |
| SN74F244DWR | Identical SOIC-20 footprint and electrical specs; RoHS-compliant, tape-and-reel packaging (2000 pcs) | Optimized for SMT production with automated pick-and-place compatibility | Select for volume manufacturing where DWG4's tube packaging is insufficient |
Compared with SN74F244N and SN74F244DWR, SN74F244DWG4 offers identical SOIC-20 form factor and performance but ships in tube packaging - making it ideal for low-volume engineering validation, repair spares, or mixed-technology boards requiring both SMT and through-hole components.
Availability
SN74F244DWG4 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interfacing, legacy computer expansion, and test equipment signal routing requiring stable component supply and long-term obsolescence management.
Supply support for SN74F244DWG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with deep heritage in TTL and F-family logic design.
The SN74F244DWG4 belongs to TI's 74F logic family - engineered for high-speed, low-power 5 V TTL systems in industrial, computing, and instrumentation applications where reliability and timing precision are critical.
FAQ
What is the maximum operating temperature for SN74F244DWG4?
The SN74F244DWG4 is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade rating aligns with standard industrial control and embedded computing environments. Exceeding 70°C may cause parameter drift or premature failure; thermal derating is not supported per datasheet.
Does SN74F244DWG4 support 3.3 V logic levels?
No, SN74F244DWG4 is a 5 V TTL device and does not support 3.3 V operation. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V at −3 mA) are specified only for VCC = 4.5–5.5 V. Using it with 3.3 V supplies risks undefined logic states and excessive current draw.
How many output-enable inputs does SN74F244DWG4 have?
SN74F244DWG4 has two active-low output-enable inputs: 1OE (Pin 1) controls Y1–Y4, and 2OE (Pin 19) controls Y5–Y8. This dual-OE architecture enables independent channel gating - essential for time-multiplexed bus sharing or selective peripheral enablement in complex systems.
Can SN74F244DWG4 drive a 50 pF bus load at 10 MHz?
Yes, SN74F244DWG4 is explicitly characterized with CL = 50 pF and RL = 500 Ω in its switching specifications. At 5 V supply, its worst-case tPLH/tPHL is 6.2 ns, supporting reliable 10 MHz bus toggling with adequate setup/hold margin. Layout best practices (short traces, local decoupling) are still required.
Is SN74F244DWG4 pin-compatible with SN74LS244?
Yes, SN74F244DWG4 is pin-compatible with SN74LS244 in SOIC-20 (DW) packaging - same pinout, same 20-pin layout, and identical function. However, SN74F244DWG4 offers faster propagation (6.2 ns vs. 15 ns), higher drive (64 mA vs. 24 mA), and greater power consumption - verify timing and thermal constraints before drop-in replacement.
SN74F244DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74F244DWG4 FAQ
1.How can I place an order for SN74F244DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F244DWG4 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 SN74F244DWG4 reliable?
The price and inventory of SN74F244DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244DWG4 is usually 5 days.
3.What payment methods are accepted for SN74F244DWG4?
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4.How is shipping managed for SN74F244DWG4?
SN74F244DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F244DWG4 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 SN74F244DWG4?
For technical support, including SN74F244DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244DWG4 requirements.
6.How does Aetrix verify that SN74F244DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74F244DWG4 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 SN74F244DWG4 meets industry standards.
7.What is the process for return or replacement of SN74F244DWG4?
All SN74F244DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244DWG4, 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 SN74F244DWG4 part is unused and in its original packaging.
Return procedure for SN74F244DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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