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Texas Instruments SN74F244DWR
- Part No.:
- SN74F244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74F244DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,065
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Product details
Overview
SN74F244DWR from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address and bus interface applications. It features two independent 4-bit channels, active-low output-enable (OE) control per group, 5 V supply operation, 64 mA low-level output drive, and 6.5 ns max propagation delay at 5 V. It is used in legacy industrial control backplanes and TTL-compatible data routing systems.
For engineers reviewing the SN74F244DWR datasheet, SN74F244DWR pinout, SN74F244DWR application, or SN74F244DWR equivalent, key selection criteria include its 20-pin SOIC (DW) package, dual-group 3-state architecture, guaranteed 0°C to 70°C commercial temperature range, and compatibility with standard 5 V TTL logic families.
Technical Context
The SN74F244DWR implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) inputs. Data flows unidirectionally from A inputs to Y outputs only when the corresponding OE is low; otherwise, outputs enter high-impedance state.
It uses bipolar F-type (fast TTL) technology, delivering symmetrical switching performance: tPLH/tPHL ≤ 6.5 ns, tPZL/tPLZ ≤ 8 ns, and VOL ≤ 0.55 V at IOL = 64 mA. Input thresholds are VIH ≥ 2 V and VIL ≤ 0.8 V, ensuring robust noise margin in mixed-logic environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - operates reliably across standard TTL VCC tolerance band |
| Output Drive (IOL) | 64 mA - supports direct driving of multiple TTL loads or moderate-capacitance buses |
| Propagation Delay | ≤6.5 ns - enables use in sub-100 MHz synchronous bus timing budgets |
| Input Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - ensures interoperability with 5 V CMOS and TTL logic families |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications |
| Output Leakage (IOZL/IOZH) | ±50 µA - maintains high-impedance integrity during bus contention or power-down states |
| Quiescent Current (ICC) | 60–90 mA - reflects typical F-series bipolar power consumption under active load conditions |
Pinout & Package
SN74F244DWR is housed in a 20-pin SOIC (DW) package measuring 13.0 mm × 7.6 mm × 2.65 mm, with 1.27 mm lead pitch and RoHS-compliant NiPdAu (NIPDAU) finish. It complies with JEDEC MS-013 and is rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Group 1 Output Enable (active-low) | Controls Y1–Y4; pulls all four outputs to high-Z when high |
| 1A1–1A4 | Group 1 Inputs | Noninverting data inputs for first 4-bit channel |
| 1Y1–1Y4 | Group 1 Outputs | Buffered noninverting outputs corresponding to 1A1–1A4 |
| GND (Pin 10) | Ground Reference | Primary return path for logic and output current |
| VCC (Pin 20) | Power Supply | 5 V supply input; decoupling required within 10 mm of pin |
| 2OE | Group 2 Output Enable (active-low) | Controls Y5–Y8; independent of 1OE for flexible bus partitioning |
| 2A1–2A4 | Group 2 Inputs | Noninverting data inputs for second 4-bit channel |
| 2Y1–2Y4 | Group 2 Outputs | Buffered noninverting outputs corresponding to 2A1–2A4 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables separate enable control for two bus segments without external gating logic |
| 3-State outputs with symmetrical OE | Prevents bus contention in multi-driver systems; OE inputs share identical DC specs |
| High sink current (64 mA) | Drives up to 10 standard TTL loads per output, reducing need for external buffers |
| Fast TTL propagation (≤6.5 ns) | Meets timing requirements for 20+ MHz address/data strobes in legacy microprocessor systems |
| SOIC-20 RoHS-compliant packaging | Supports automated SMT assembly and reflow profiles per J-STD-020 Level-1 |
Applications
| Industrial Backplane Bus Driver | Legacy Microprocessor Address Buffer |
|---|---|
Use Scenario: Driving parallel address lines between CPU and peripheral cards in DIN-rail-mounted PLC chassis. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from expansion slots; enabled only during valid memory access cycles. Use Value: Prevents signal corruption during bus arbitration; 64 mA drive sustains signal integrity over 15 cm ribbon cable runs. | Use Scenario: Latching and buffering 16-bit address signals in Z80- or 8086-based embedded controllers. IC Role / Device Role / Timing Role: Splitting address bus into upper/lower byte groups with independent OE control for bank-select logic. Use Value: Eliminates need for discrete enable logic; 6.5 ns delay preserves setup/hold margins for 8 MHz clock domains. |
| Memory Module Interface | TTL-Level Signal Isolation |
Use Scenario: Interfacing SRAM modules to microcontroller buses where voltage translation is unnecessary. IC Role / Device Role / Timing Role: Bidirectional buffer (used unidirectionally) translating address/data paths while providing drive strength and isolation. Use Value: 0.55 V VOL at full load ensures >0.4 V noise margin against TTL VIH minimum; high-Z state prevents backfeeding. | Use Scenario: Electrically isolating test equipment I/O lines from DUTs during functional verification. IC Role / Device Role / Timing Role: Unidirectional level-shifting buffer enabling safe connection of 5 V logic to sensitive analog subsystems. Use Value: ±50 µA high-Z leakage limits unintended current flow; 20-pin SOIC footprint simplifies PCB layout in dense test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Lower drive (24 mA), slower (20 ns), same pinout and function | Higher noise margin but insufficient for heavy TTL fanout or fast timing | Choose for lower power or legacy LS-system compatibility where speed is not critical |
| SN74HC244N | CMOS process, 74HC logic levels, 7.5 mA drive, 23 ns typical delay | Requires 5 V tolerant inputs if interfacing with older TTL; lower ICC but higher VOL at full load | Prefer for new designs needing lower static power and better noise immunity, provided timing budget allows |
Compared with SN74LS244N and SN74HC244N, the SN74F244DWR delivers superior speed and drive strength for demanding legacy bus interfaces, while retaining pin compatibility with both alternatives-enabling drop-in replacement where thermal and timing margins permit.
Availability
SN74F244DWR is available at Aetrix Electronics and suitable for industrial backplane bus drivers, legacy microprocessor address buffering, memory module interfacing, and TTL-level signal isolation requiring stable component supply and long-term obsolescence management.
Supply support for SN74F244DWR 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 communications markets.
The SN74F244DWR belongs to TI's 74F logic family, engineered for high-speed TTL-compatible digital interfacing in mission-critical industrial and computing infrastructure where reliability and timing predictability are essential.
FAQ
What is the maximum operating temperature range for SN74F244DWR?
The SN74F244DWR is characterized for operation from 0°C to 70°C, meeting commercial-grade temperature specifications. This range is validated per TI's recommended operating conditions and applies specifically to the DW-package variant. Operation outside this range may result in parametric degradation or functional failure, and is not supported by TI's datasheet guarantees.
Does SN74F244DWR support true bidirectional data flow?
No, SN74F244DWR is a unidirectional noninverting buffer. Data flows only from A inputs to Y outputs; it lacks internal direction control or bus transceiver capability. For bidirectional applications, discrete control logic or dedicated transceivers like SN74F245 must be used alongside SN74F244DWR.
Can SN74F244DWR be used with 3.3 V logic systems?
SN74F244DWR is designed for 5 V TTL operation and is not 3.3 V tolerant. Its input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and absolute maximum ratings (VI up to 7 V) allow interfacing with 3.3 V outputs only if those outputs meet TTL-compatible voltage levels-but sustained use outside 4.5–5.5 V VCC risks parametric shift or reliability issues. Dedicated level translators are recommended for mixed-voltage systems.
What is the pin 1 marking and orientation for SN74F244DWR?
SN74F244DWR uses standard SOIC-20 (DW) packaging with pin 1 located at the top-left corner of the device body, identified by a small beveled edge or dot adjacent to the lead. The tape-and-reel orientation follows quadrant Q1 per TI's packaging documentation, ensuring consistent pick-and-place alignment during SMT assembly.
Is SN74F244DWR RoHS compliant and what is its lead finish?
Yes, SN74F244DWR is RoHS compliant with NiPdAu (NIPDAU) lead finish. This finish meets J-STD-020 Level-1 moisture sensitivity requirements and supports standard Pb-free reflow profiles up to 260°C peak. The "R" suffix in the part number explicitly denotes RoHS-compliant packaging and finish per TI's ordering nomenclature.
SN74F244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- 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:
- 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
SN74F244DWR FAQ
1.How can I place an order for SN74F244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F244DWR 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 SN74F244DWR reliable?
The price and inventory of SN74F244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244DWR is usually 5 days.
3.What payment methods are accepted for SN74F244DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F244DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F244DWR?
SN74F244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F244DWR 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 SN74F244DWR?
For technical support, including SN74F244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244DWR requirements.
6.How does Aetrix verify that SN74F244DWR is sourced from the original manufacturer or authorized distributors?
All SN74F244DWR 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 SN74F244DWR meets industry standards.
7.What is the process for return or replacement of SN74F244DWR?
All SN74F244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244DWR, 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 SN74F244DWR part is unused and in its original packaging.
Return procedure for SN74F244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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