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Texas Instruments SN74F244N
- Part No.:
- SN74F244N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74F244N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:487
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Product details
Overview
SN74F244N from Texas Instruments is an octal noninverting 3-state buffer/line driver in a 20-pin PDIP package, operating from 0°C to 70°C with 5 V supply. It features two independent 4-bit channels, active-low output-enable (OE) control per channel, and supports bus driving and memory address register buffering. Used in legacy industrial control backplanes and TTL-compatible data path isolation.
For engineers reviewing the SN74F244N datasheet, SN74F244N pinout, SN74F244N application, or SN74F244N equivalent, key selection criteria include guaranteed 48 mA low-level output drive at 5 V, 6.5 ns max propagation delay (A→Y), high-impedance output state under OE high, and compatibility with standard 5 V TTL logic families.
Technical Context
The SN74F244N implements dual 4-bit noninverting buffers with separate active-low output-enable inputs (1OE, 2OE). Each channel passes A-inputs to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high. No internal inversion or latching occurs - it is purely combinational 3-state logic.
Designed for TTL-system interfacing, it meets standard F-series specifications: VIH = 2 V min, VIL = 0.8 V max, VOL = 0.55 V max at IOL = 48 mA, and VOH = 2.4 V min at IOH = −3 mA. Input clamp current is rated at −18 mA, supporting robust noise immunity in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL power rails and tolerates ±10% regulation variation. |
| Output Drive (IOL) | 48 mA - sufficient to drive multiple TTL loads (fan-out ≥10) without signal degradation on shared buses. |
| Propagation Delay (tPLH/tPHL) | 1.7–6.2 ns - enables reliable operation in sub-100 MHz synchronous bus systems with tight timing margins. |
| 3-State Leakage (IOZL/IOZH) | ±50 µA - guarantees minimal bus contention during high-impedance state, critical for multi-driver arbitration. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including industrial HMIs and legacy instrumentation. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - matches standard TTL logic levels, eliminating need for level-shifting in mixed-Family designs. |
Pinout & Package
SN74F244N uses a 20-pin plastic dual in-line package (PDIP-N), 0.300" wide, with standard through-hole mounting and 0.1" pin pitch. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - independently disable Channel 1 (pins 3–6, 18–15) or Channel 2 (pins 11–14, 9–12). |
| 2–5, 18–15 | 1A1–1A4, 1Y1–1Y4 | Channel 1 input/output pairs - noninverting path: A1→Y1, A2→Y2, etc., with 3-state Y outputs. |
| 11–14, 9–12 | 2A1–2A4, 2Y1–2Y4 | Channel 2 input/output pairs - electrically isolated from Channel 1; identical noninverting 3-state behavior. |
| 10, 20 | GND, VCC | Power terminals - requires local 0.1 µF ceramic decoupling at VCC pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit channels | Enables selective bus segmentation - e.g., isolate address vs. data paths without cross-talk or timing skew. |
| 3-State outputs with OE control | Allows bidirectional bus sharing among multiple drivers; prevents contention when only one device drives at a time. |
| High sink current (48 mA) | Drives long PCB traces or multiple TTL inputs while maintaining VOL ≤ 0.55 V - avoids logic low failures. |
| TTL-compatible input thresholds | Directly interfaces with 74LS, 74S, and other legacy TTL families without external biasing or level translation. |
| Robust absolute ratings | Withstands −1.2 V input undershoot and 7 V transient overvoltage - enhances reliability in electrically noisy factory floors. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with per-channel OE control isolates address decoding logic from memory array loading. Use Value: Prevents capacitive loading-induced timing violations and ensures clean address transitions across all memory devices. | Use Scenario: Interfacing a CPU data bus to peripheral controllers (e.g., UART, parallel port) in a modular backplane system. IC Role / Device Role / Timing Role: 3-state line driver enabling time-multiplexed bus access between CPU and peripherals. Use Value: Eliminates need for external bus transceivers; simplifies layout and reduces component count in space-constrained industrial modules. |
| Legacy System Upgrade Interface | TTL-Level Signal Conditioning |
Use Scenario: Bridging modern FPGA I/O (3.3 V LVTTL) to legacy 5 V TTL subsystems via level-shifting circuitry. IC Role / Device Role / Timing Role: Acts as a robust 5 V-tolerant repeater stage after discrete level shifters to restore signal integrity. Use Value: Compensates for voltage drop and rise/fall time degradation introduced by passive level translation networks. | Use Scenario: Cleaning up marginal clock or strobe signals in aging test equipment with degraded edge rates. IC Role / Device Role / Timing Role: Low-skew, noninverting buffer restoring fast edges and driving heavy capacitive loads. Use Value: Ensures setup/hold timing compliance for downstream latch ICs where original signal edges have degraded below spec. |
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 |
|---|---|---|---|
| SN74LS244N | Lower drive (24 mA IOL), slower (15–25 ns delay), higher power (19 mA ICC), same PDIP-20 package. | Suitable for lower-speed, lower-power legacy systems where fan-out < 5 is acceptable. | Choose if system timing budget allows >2× longer propagation delay and power consumption must be minimized. |
| SN74HC244N | CMOS technology: rail-to-rail VOH/VOL, 74HC speed (~15 ns), 2 V–6 V supply range, but only 7.8 mA IOL at 5 V. | Better for mixed-voltage systems or battery-powered upgrades; not drop-in for high-fan-out TTL loads. | Prefer when upgrading to CMOS logic families or requiring wider supply tolerance; verify load drive capability first. |
Compared with SN74LS244N and SN74HC244N, the SN74F244N delivers superior speed and drive strength for demanding 5 V TTL bus applications, though at higher quiescent current - making it optimal for performance-critical industrial backplanes where legacy compatibility is mandatory.
Availability
SN74F244N is available at Aetrix Electronics and suitable for industrial control backplanes, legacy instrumentation interfaces, and 5 V TTL-based data acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for SN74F244N 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 for industrial, automotive, and communications markets.
The SN74F244N belongs to TI's 74F family of fast TTL logic devices, engineered specifically for high-speed bus driving, memory address buffering, and clock distribution in noise-immune industrial control systems.
FAQ
What is the maximum output sink current specification for SN74F244N?
The SN74F244N is rated for 48 mA low-level output current (IOL) at VCC = 4.5 V and VOL ≤ 0.55 V. This value is confirmed in the "Electrical Characteristics" table of the official SDFS063A datasheet. Exceeding this current may cause VOL to exceed logic-low threshold, risking downstream logic errors. The SN74F244N maintains this rating across its full 0°C to 70°C operating range.
Does SN74F244N support mixed-voltage operation, such as interfacing with 3.3 V logic?
No, SN74F244N is a 5 V-only TTL device. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output swing (VOH ≈ 2.4–3.3 V, VOL ≤ 0.55 V) are optimized for 5 V TTL compatibility. While 3.3 V logic may recognize its outputs as valid highs, SN74F244N inputs require ≥2.0 V to register a logic high - marginal with 3.3 V CMOS outputs. Direct interface is not recommended without level translation.
Can SN74F244N replace SN74LS244N in an existing design without layout changes?
Yes - SN74F244N is pin-compatible with SN74LS244N in the PDIP-20 package and shares identical pinout, supply, and logic function. However, SN74F244N draws higher quiescent current (60–90 mA vs. ~19 mA) and delivers faster edges. Verify PCB power delivery and signal integrity margins before substitution, especially in thermally constrained layouts.
What is the purpose of the two separate OE inputs on SN74F244N?
The SN74F244N has two independent active-low output-enable inputs (1OE on pin 1, 2OE on pin 19) to control its two 4-bit channels separately. This allows partial bus enablement - for example, enabling only address bits A0–A3 while holding A4–A7 in high-Z - enabling flexible memory mapping or dynamic bus partitioning without additional logic.
Is SN74F244N RoHS compliant and lead-free?
Yes, SN74F244N is RoHS compliant with lead-free (NiPdAu) terminal finish, as confirmed in TI's Package Option Addendum. It carries "Yes" in the RoHS column and "NIPDAU" under Lead finish/Ball material. The part operates from 0°C to 70°C and is supplied in tube packaging (20 units per tube), meeting modern environmental compliance requirements for industrial deployment.
SN74F244N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74F244N FAQ
1.How can I place an order for SN74F244N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F244N 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 SN74F244N reliable?
The price and inventory of SN74F244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244N is usually 5 days.
3.What payment methods are accepted for SN74F244N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F244N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F244N?
SN74F244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F244N 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 SN74F244N?
For technical support, including SN74F244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244N requirements.
6.How does Aetrix verify that SN74F244N is sourced from the original manufacturer or authorized distributors?
All SN74F244N 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 SN74F244N meets industry standards.
7.What is the process for return or replacement of SN74F244N?
All SN74F244N units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244N, 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 SN74F244N part is unused and in its original packaging.
Return procedure for SN74F244N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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