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Texas Instruments SN74ACT244NS
- Part No.:
- SN74ACT244NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT244NS.pdf
- Description:
- BUFF/DVR TRI-ST DUAL 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,640
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Product details
Overview
SN74ACT244NS from Fairchild Semiconductor is an octal non-inverting buffer/line driver with 3-STATE outputs, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver applications. It operates at 4.5V–5.5V supply, delivers ±24mA output drive, features TTL-compatible inputs, and supports −40°C to +85°C industrial temperature range.
For engineers reviewing the SN74ACT244NS datasheet, SN74ACT244NS pinout, SN74ACT244NS application, or SN74ACT244NS equivalent, this page provides verified functional identity, SOIC-20 package mapping, 3-STATE control logic, propagation delay (≤10 ns @ 5V), and direct alternatives for bus buffering in industrial control and legacy system upgrades.
Technical Context
The SN74ACT244NS implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1 on pins 12/14/16/18; OE2 on pins 3/5/7/9). Each output drives up to ±24mA while maintaining TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 5V).
Its AC performance includes tPLH/tPHL ≤ 10 ns (CL = 50pF, VCC = 5V), tPZH/tPZL ≤ 9.5 ns, and tPHZ/tPLZ ≤ 10.5 ns - enabling reliable operation in high-speed data buses and address latching circuits without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal non-inverting 3-STATE buffer/line driver for bidirectional bus isolation and address/data path strengthening |
| Supply Voltage | 4.5V–5.5V - ensures compatibility with standard 5V TTL and CMOS logic systems |
| Output Drive | ±24mA per output - sufficient to drive 15–20 TTL loads or terminate unterminated stubs in medium-length PCB traces |
| Propagation Delay | ≤10 ns (tPLH/tPHL, VCC = 5V, CL = 50pF) - enables use in 50–100 MHz synchronous bus timing windows |
| 3-STATE Enable Timing | tPZH/tPZL ≤ 9.5 ns, tPHZ/tPLZ ≤ 10.5 ns - guarantees clean bus release before next cycle's data assertion |
| Input Compatibility | TTL-compatible VIH/VIL (2.0V/0.8V min/max at 5V) - allows direct interfacing with legacy 74LS/74F series without level-shifting |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, instrumentation, and embedded computing environments |
Pinout & Package
SN74ACT244NS is supplied in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (package code M20B), with 1.27 mm lead pitch and gull-wing surface-mount terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 10, 11, 13, 15 | Inputs (I0–I7) | Non-inverting data inputs; accept TTL-compatible logic levels for buffering to outputs O0–O7 |
| 3, 5, 7, 9 | OE2 (Output Enable 2) | Active-low enable controlling outputs O0–O3; low = enabled, high = high-impedance |
| 12, 14, 16, 18 | OE1 (Output Enable 1) | Active-low enable controlling outputs O4–O7; independent of OE2 for split-bus control |
| 8 | GND | Ground reference for all internal circuitry and I/O |
| 19 | VCC | Positive supply rail (4.5V–5.5V); powers internal logic and output drivers |
| 17, 18, 20, 1, 2, 4, 6, 10 | Outputs (O0–O7) | 3-STATE buffered outputs; driven high/low when respective OE is low, high-Z otherwise |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 4-bit enables | OE1 and OE2 allow separate control of upper/lower nibbles - essential for segmented bus arbitration and partial address decoding |
| TTL-compatible inputs | VIH ≥ 2.0V and VIL ≤ 0.8V at 5V supply - eliminates need for external level translators when interfacing with 74LS, 74F, or microcontroller GPIO |
| Low ICC and IOZ | Quiescent ICC ≤ 40 µA and 3-STATE leakage IOZ ≤ ±2.5 µA - minimizes standby power in battery-backed or energy-sensitive systems |
| High-output drive strength | ±24mA sink/source capability - supports fanout to multiple TTL loads or termination of unterminated transmission lines up to ~10 cm |
| Fast 3-STATE switching | tPZH/tPHZ ≤ 10.5 ns - prevents bus contention during enable/disable transitions in multiplexed address/data paths |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in legacy industrial PLC modules. IC Role / Device Role / Timing Role: Non-inverting buffer isolating MCU address outputs from capacitive bus load; OE1/OE2 synchronized to memory access strobes. Use Value: Prevents address skew and timing violations by delivering full-strength signals with <10 ns propagation delay and clean 3-STATE release. |
Use Scenario: Bidirectional data path conditioning between FPGA and legacy ISA-style peripheral cards. IC Role / Device Role / Timing Role: Line driver/receiver providing direction-controlled bus isolation; OE1/OE2 coordinated with DIR signal to manage data flow direction. Use Value: Enables reliable 8-bit parallel communication at up to 10 MHz with TTL-level compatibility and no external pull-ups required. |
| Clock Distribution | Legacy System Upgrade Interface |
|
Use Scenario: Fanout of 5 MHz system clock to multiple synchronous peripherals (ADC, DAC, UART) in test equipment. IC Role / Device Role / Timing Role: Low-skew clock buffer with matched tPLH/tPHL ensuring simultaneous edge delivery across all eight outputs. Use Value: Maintains setup/hold margins across distributed clock loads while suppressing reflections via controlled output impedance. |
Use Scenario: Interfacing modern ARM-based controller with vintage 8-bit microprocessor peripheral bus (e.g., Z80 or 8085 expansion slots). IC Role / Device Role / Timing Role: Level-translation and drive-strengthening buffer for address/data/control lines; OE pins tied to legacy bus grant signals. Use Value: Eliminates need for discrete transistor arrays or additional logic, reducing BOM count and layout complexity in retrofit designs. |
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 |
|---|---|---|---|
| SN74ACT244N | PDIP-20 package (N20A), same electrical specs and pinout as SN74ACT244NS | Through-hole assembly; suitable for prototyping, repair, or legacy wave-solder processes | Select SN74ACT244N only when through-hole mounting or manual rework is required; identical functionality but larger footprint. |
| 74ACT244MTC | TSSOP-20 package (MTC20), 4.4mm width, same AC/ACT specs and pinout | Higher-density SMT layout; compatible with fine-pitch routing and automated reflow | Choose 74ACT244MTC for space-constrained boards where SOIC-20 is too wide; requires tighter stencil design but offers same timing and drive. |
Compared with SN74ACT244NS, SN74ACT244N provides identical logic and timing in through-hole form for serviceability, while 74ACT244MTC delivers the same performance in a 35% smaller footprint - enabling layout optimization without compromising bus drive strength or 3-STATE control fidelity.
Availability
SN74ACT244NS is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface modules, and embedded instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT244NS 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
Fairchild Semiconductor was a U.S.-based semiconductor manufacturer specializing in analog, logic, and power ICs before its acquisition by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The SN74ACT244NS belongs to Fairchild's ACT (Advanced CMOS TTL-compatible) logic family, engineered for high-speed, low-power 5V bus interfacing with robust noise immunity and legacy system compatibility.
FAQ
What is the supply voltage range for SN74ACT244NS?
The SN74ACT244NS operates over a supply voltage range of 4.5V to 5.5V. This range ensures compatibility with standard 5V TTL logic families and provides margin against rail droop in noisy industrial environments. Operation outside this range may cause undefined behavior or damage, as specified in the absolute maximum ratings.
Does SN74ACT244NS support true bidirectional data flow?
No, SN74ACT244NS is a unidirectional octal buffer - it has dedicated inputs (I0–I7) and outputs (O0–O7) with no internal direction control. Bidirectional operation requires external control of OE1/OE2 and careful system-level handshaking; the device itself does not auto-sense direction or include internal transceivers.
What is the maximum output current rating per pin for SN74ACT244NS?
Each output of SN74ACT244NS is rated for ±24mA DC sink/source current under recommended operating conditions. This value is confirmed in the DC Electrical Characteristics table for ACT devices at VCC = 5.5V and TA = −40°C to +85°C, supporting robust drive into TTL loads or short PCB traces.
Can SN74ACT244NS be used as a replacement for SN74LS244?
Yes, SN74ACT244NS is a functionally compatible upgrade for SN74LS244, offering identical pinout, TTL-compatible inputs, and higher output drive (±24mA vs. ±15mA), lower power consumption, and faster propagation delay (≤10 ns vs. ~20 ns). No PCB changes are needed, but verify VCC stability and decoupling due to higher speed.
What package type is used for SN74ACT244NS?
SN74ACT244NS uses a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (package code M20B), with 1.27 mm lead pitch and gull-wing surface-mount leads. This package is RoHS-compliant and suitable for reflow soldering per JEDEC J-STD-020B.
SN74ACT244NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ACT244NS FAQ
1.How can I place an order for SN74ACT244NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244NS 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 SN74ACT244NS reliable?
The price and inventory of SN74ACT244NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244NS is usually 5 days.
3.What payment methods are accepted for SN74ACT244NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244NS?
SN74ACT244NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244NS 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 SN74ACT244NS?
For technical support, including SN74ACT244NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244NS requirements.
6.How does Aetrix verify that SN74ACT244NS is sourced from the original manufacturer or authorized distributors?
All SN74ACT244NS 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 SN74ACT244NS meets industry standards.
7.What is the process for return or replacement of SN74ACT244NS?
All SN74ACT244NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244NS, 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 SN74ACT244NS part is unused and in its original packaging.
Return procedure for SN74ACT244NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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