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Texas Instruments SN74F244DWRG4
- Part No.:
- SN74F244DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74F244DWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,610
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Product details
Overview
SN74F244DWRG4 from Texas Instruments is a noninverting octal buffer/line driver with dual 4-bit sections, 3-state outputs, active-low output-enable (OE) control, and TTL-compatible logic levels. It operates from 4.5 V to 5.5 V at 0°C to 70°C and drives memory address registers or bus lines in legacy industrial control and data acquisition systems.
For engineers reviewing the SN74F244DWRG4 datasheet, SN74F244DWRG4 pinout, SN74F244DWRG4 application, or SN74F244DWRG4 equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional truth table behavior, and real-world use context for bus isolation and address buffering in 5-V TTL systems.
Technical Context
The SN74F244DWRG4 implements two independent 4-bit noninverting buffers, each with dedicated active-low OE inputs (1OE, 2OE). When OE is low, A→Y data passes transparently; when high, outputs enter high-impedance state-enabling bidirectional bus sharing without contention.
It uses standard TTL circuitry with guaranteed VOH ≥2.4 V at IOL = 48 mA and VOL ≤0.55 V at IOL = 64 mA. Propagation delay is 1.7–6.5 ns (A→Y) and 1.2–8.0 ns (OE→Y), supporting reliable timing in synchronous 5-V digital systems with CL = 50 pF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | F-series TTL - ensures compatibility with legacy 5-V TTL systems and predictable noise margins |
| Supply Voltage | 4.5 V to 5.5 V - supports stable operation across standard 5-V rail tolerances |
| Output Drive | 64 mA sink per output - sufficient to drive multiple TTL inputs or short PCB traces |
| Propagation Delay | 1.7–6.5 ns (A→Y) - enables sub-100 MHz bus operation with margin in synchronous designs |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and embedded equipment |
| Input Compatibility | VIH ≥2.0 V, VIL ≤0.8 V - matches standard TTL input thresholds for seamless integration |
| 3-State Leakage | ±50 µA (IOZH/IOZL) - ensures minimal bus leakage during high-Z mode in shared-bus architectures |
Pinout & Package
SN74F244DWRG4 is packaged in a 20-pin SOIC (DW) with 0.300-inch body width and 1.27 mm pitch. Pin 1 is located at the top-left corner with a beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low output enable (Section 1) | Controls Y1–Y4; low = enabled, high = high-Z - allows independent gating of first 4-bit channel |
| 1A1–1A4 | Noninverting inputs (Section 1) | Accept TTL-level signals; drive corresponding Y1–Y4 outputs when 1OE is low |
| 1Y1–1Y4 | Noninverting outputs (Section 1) | Source/sink up to 64 mA; high-Z when 1OE is high - isolates Section 1 from bus |
| GND (Pin 10) | Ground reference | Common return path for all inputs, outputs, and internal circuitry - must be low-impedance |
| VCC (Pin 20) | Positive supply | 5-V nominal power rail; decoupling capacitor required near pin for noise suppression |
| 2OE | Active-low output enable (Section 2) | Controls Y5–Y8; independent of 1OE - enables dual-channel bus arbitration |
| 2A1–2A4 | Noninverting inputs (Section 2) | Drive Y5–Y8 when 2OE is low - supports parallel or staggered address/data buffering |
| 2Y1–2Y4 | Noninverting outputs (Section 2) | Match 1Yx drive strength and timing - permits identical layout for both sections |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit sections | Enables separate control of two bus segments using 1OE and 2OE - reduces external logic for multi-zone addressing |
| 3-State outputs with symmetrical OE | Guaranteed high-impedance state under all valid OE conditions - prevents bus contention during power-up/down or reset |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures robust interfacing with legacy 74LS/74F logic without level shifters |
| High sink current capability | 64 mA per output - drives up to 10 standard TTL loads or long traces without external buffers |
| SOIC-20 RoHS-compliant packaging | NIPDAU lead finish, MSL Level-1 - supports automated assembly and long-term reliability in commercial environments |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Buffering CPU-generated address signals before driving multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting octal buffer with 3-state control - isolates address lines during DMA cycles or peripheral access. Use Value: Prevents loading-induced timing skew and signal degradation across 20+ cm traces while enabling clean bus release via OE. | Use Scenario: Separating microcontroller data bus from peripheral modules (e.g., ADC, DAC, UART) to avoid signal contention. IC Role / Device Role / Timing Role: Dual-section 3-state driver - allows one section to drive while the other releases, supporting half-duplex shared-bus protocols. Use Value: Eliminates need for discrete pull-ups or bus transceivers; simplifies PCB routing with deterministic high-Z transitions. |
| Legacy Industrial Controller I/O | Test Equipment Signal Conditioning |
Use Scenario: Interfacing PLC CPU boards with TTL-compatible I/O expansion cards requiring level-consistent drivers. IC Role / Device Role / Timing Role: Robust 5-V buffer with 64 mA sink - handles relay coil drivers, optocoupler inputs, and LED indicators directly. Use Value: Reduces component count by replacing multiple discrete transistors or ULN2003 arrays in cost-sensitive control panels. | Use Scenario: Driving calibration reference signals or multiplexed test stimuli into DUTs with varying input impedances. IC Role / Device Role / Timing Role: Low-propagation-delay buffer - preserves edge integrity for <10 ns pulse fidelity in automated test fixtures. Use Value: Maintains signal rise/fall times within ±0.5 ns across temperature, critical for jitter-sensitive parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Lower drive (24 mA sink), slower propagation (15–25 ns), same SOIC-20 pinout | Higher power efficiency but insufficient for heavy bus loading or fast timing | Select when lower speed and reduced power consumption outweigh drive strength requirements |
| SN74HC244N | CMOS technology, wider VCC range (2–6 V), higher input impedance, 3.5 mA drive | Not TTL-compatible; requires level translation when interfacing with legacy 5-V TTL systems | Choose only in new 3.3-V or mixed-voltage designs where TTL compatibility is not required |
Compared with SN74LS244N and SN74HC244N, SN74F244DWRG4 provides superior drive strength and speed for legacy 5-V TTL bus systems, but lacks CMOS voltage flexibility or LS-series power efficiency - making it optimal for retrofitting or maintaining existing F-series infrastructure.
Availability
SN74F244DWRG4 is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and legacy industrial controller I/O requiring stable component supply and long-lifecycle support.
Supply support for SN74F244DWRG4 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, delivering analog, embedded processing, and logic solutions across industrial, automotive, and communications markets.
The SN74F244DWRG4 belongs to TI's 74F logic family, designed specifically for high-speed, high-drive 5-V TTL systems where performance and density outweigh ultra-low power concerns.
FAQ
What is the maximum output sink current specification for SN74F244DWRG4?
The SN74F244DWRG4 is rated for 64 mA per output in the low state (IOL) under recommended operating conditions (VCC = 4.5 V, TA = 0°C to 70°C). This value is confirmed in the "Electrical Characteristics" table of the official datasheet SDFS063A, ensuring reliable drive capability for multiple TTL loads or moderate PCB trace capacitance without external amplification. Exceeding this current risks exceeding absolute maximum ratings.
Does SN74F244DWRG4 support 3.3-V logic interfaces?
No, SN74F244DWRG4 is a 5-V TTL device with VIH minimum of 2.0 V and VIL maximum of 0.8 V - it is not guaranteed to operate correctly with 3.3-V CMOS logic levels. Direct connection to 3.3-V systems may cause marginal switching or increased power consumption. For 3.3-V compatibility, consider SN74LVC244A or level-shifting solutions. The SN74F244DWRG4 requires a stable 4.5–5.5 V supply and TTL-compatible inputs.
What is the pin 1 marking and orientation for SN74F244DWRG4 in SOIC-20 package?
SN74F244DWRG4 in SOIC-20 (DW) package uses a beveled edge or notch at the top-left corner to indicate pin 1 location. The part marking "F244" appears on the top surface, aligned with pin 1 in the upper-left quadrant. Board layout must follow TI's DW0020A package outline, with land pattern dimensions matching 1.27 mm pitch and 0.6 mm lead width - verified in TI's PACKAGE OUTLINE DW0020A document.
Can SN74F244DWRG4 replace SN74F244N in an existing design?
Yes, SN74F244DWRG4 is a direct functional and pin-compatible replacement for SN74F244N, both being 20-pin 5-V octal buffers with identical logic behavior, timing, and DC specifications. The only differences are package (SOIC vs. PDIP) and RoHS compliance (NIPDAU vs. leaded). Layout changes are required due to footprint mismatch, but no schematic or firmware modifications are needed - confirming drop-in replacement capability per TI's PACKAGE OPTION ADDENDUM.
What is the typical propagation delay from input A to output Y for SN74F244DWRG4?
The typical propagation delay from A to Y for SN74F244DWRG4 is 3.6 ns at VCC = 5 V, CL = 50 pF, and TA = 25°C, with a maximum of 6.5 ns across the full operating temperature and voltage range. This value is specified in the "Switching Characteristics" table of datasheet SDFS063A and applies identically to all eight channels. Delays remain symmetrical between rising and falling edges (tPLH ≈ tPHL), supporting balanced timing in synchronous bus architectures.
SN74F244DWRG4 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:
- Obsolete
- 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
SN74F244DWRG4 FAQ
1.How can I place an order for SN74F244DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F244DWRG4 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 SN74F244DWRG4 reliable?
The price and inventory of SN74F244DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74F244DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F244DWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F244DWRG4?
SN74F244DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F244DWRG4 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 SN74F244DWRG4?
For technical support, including SN74F244DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244DWRG4 requirements.
6.How does Aetrix verify that SN74F244DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74F244DWRG4 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 SN74F244DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74F244DWRG4?
All SN74F244DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244DWRG4, 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 SN74F244DWRG4 part is unused and in its original packaging.
Return procedure for SN74F244DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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