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Texas Instruments SN74ALS244C-1NSR
- Part No.:
- SN74ALS244C-1NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS244C-1NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
SN74ALS244C-1NSR from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs, designed for memory address driving, bus interfacing, and clock distribution in TTL-compatible systems. It operates from 4.5 V to 5.5 V, supports 0°C to 70°C ambient, delivers 48 mA low-level output current (IOL), and features pnp-input circuitry to reduce DC loading on upstream logic.
For engineers reviewing the SN74ALS244C-1NSR datasheet, SN74ALS244C-1NSR pinout, SN74ALS244C-1NSR application, or SN74ALS244C-1NSR equivalent, this device is selected for high-density bus buffering where controlled output enable timing, low propagation delay (≤10 ns), and robust 3-state isolation are required in industrial control and legacy computing subsystems.
Technical Context
The SN74ALS244C-1NSR implements dual 4-bit non-inverting buffers, each with independent active-low output-enable (OE) inputs - 1OE controls Y1–Y4, 2OE controls Y5–Y8. Its ALS (Advanced Low-Power Schottky) process provides improved speed-power tradeoffs over standard LS, with symmetrical OE inputs enabling synchronous bus arbitration.
It uses pnp-based input stages to minimize input current draw (IIL ≤ –0.1 mA), and its 3-state outputs exhibit fast disable times (tPZL ≤ 20 ns, tPLZ ≤ 13 ns) and low off-state leakage (IOZL ≤ –20 µA). The -1 suffix denotes enhanced IOL capability (48 mA at VCC = 4.75–5.25 V), distinct from the standard SN74ALS244C (24 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails; absolute max 7 V. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for industrial control and embedded computing. |
| Low-Level Output Current (IOL) | 48 mA - enables direct drive of heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation Delay (tPLH/tPHL) | ≤10 ns - ensures tight timing margins in high-speed address/data bus applications. |
| 3-State Disable Time (tPZL) | ≤20 ns - critical for glitch-free bus sharing and hot-swap readiness in multi-master systems. |
| Input Loading (IIL) | –0.1 mA - pnp input structure reduces DC fan-out burden on preceding logic stages. |
| Off-State Leakage (IOZL) | –20 µA - maintains high-impedance integrity during bus contention or power sequencing. |
Pinout & Package
SOP (Small Outline Package) with 20 pins, 0.635 mm pitch, 7.5 mm × 12.8 mm body, 2.0 mm max height per TI DB0020A outline. RoHS-compliant NiPdAu lead finish, MSL Level-1, tape-and-reel packaging (2000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15, 17 | Input A1–A8 | Eight buffered data inputs - grouped as A1–A4 (pins 1,2,4,6) and A5–A8 (pins 8,11,13,15). |
| 3, 5, 7, 9, 12, 14, 16, 18 | Output Y1–Y8 | Eight non-inverting 3-state outputs - Y1–Y4 (pins 3,5,7,9), Y5–Y8 (pins 12,14,16,18). |
| 19, 10 | Output Enable (1OE, 2OE) | Active-low enables: 1OE (pin 19) controls Y1–Y4; 2OE (pin 10) controls Y5–Y8 - supports split-bus control. |
| 20, 10 | VCC, GND | Power (pin 20) and ground (pin 10) - pin 10 serves dual role as GND and 2OE input (per top-view pinout). |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Enables bidirectional bus sharing without external direction control logic. |
| pnp Input Structure | Reduces input current draw to ≤0.1 mA, lowering loading on upstream drivers and improving fan-out. |
| Enhanced Sink Drive (-1 version) | 48 mA IOL supports direct interface to 10+ standard TTL loads or low-impedance transmission lines. |
| Fast Enable/Disable Timing | tPZL ≤ 20 ns and tPHZ ≤ 10 ns ensure minimal bus turnaround latency in multiplexed architectures. |
| ALS Process Technology | Delivers LS-compatible logic levels with 3× lower power than standard TTL at comparable speed. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus in microprocessor-based industrial PLC modules. IC Role / Device Role / Timing Role: Non-inverting buffer isolating CPU address outputs from high-capacitance backplane traces. Use Value: 48 mA sink capability ensures full logic swing across 150 pF load; 10 ns propagation enables 50 MHz bus operation. |
Use Scenario: Isolating shared data bus between two microcontrollers in a redundant control system. IC Role / Device Role / Timing Role: Dual 4-bit 3-state driver enabling time-multiplexed bus access via coordinated OE control. Use Value: Independent 1OE/2OE pins allow staggered enable timing to prevent bus contention during handover. |
| Clock Distribution Network | Legacy System Bus Expansion |
|
Use Scenario: Distributing synchronized clock signals to multiple peripheral ICs in a retro-computing motherboard. IC Role / Device Role / Timing Role: Low-skew buffer replicating and driving main system clock to discrete logic banks. Use Value: Matched tPLH/tPHL (≤10 ns) minimizes clock skew across eight outputs, preserving setup/hold timing. |
Use Scenario: Adding ISA-compatible expansion slots to modern embedded controllers using legacy peripherals. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer for 5 V TTL-compatible address/data latching. Use Value: ALS logic family compatibility ensures interoperability with 1980s–1990s peripherals while supporting modern PCB layouts. |
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 |
|---|---|---|---|
| SN74ALS244CN | Same ALS core, PDIP-20 package, 24 mA IOL (non–1 version), identical pinout and logic function. | Lacks enhanced 48 mA drive; suited for lighter loads or cost-sensitive through-hole designs. | Select when board layout uses DIP sockets or when 24 mA sink suffices for target load. |
| SN74AS244ANSR | AS-family variant: faster propagation (≤6.2 ns), higher IOL (64 mA), but higher ICC (up to 90 mA) and tighter VIH/VIL thresholds. | Better for ultra-high-speed timing-critical paths; less tolerant of marginal input noise or voltage droop. | Choose for sub-10 ns timing budgets where power efficiency is secondary to speed. |
Compared with SN74ALS244CN and SN74AS244ANSR, the SN74ALS244C-1NSR uniquely balances enhanced 48 mA drive, SOP packaging for space-constrained boards, and ALS power efficiency - making it optimal for modernized legacy systems requiring reliability and moderate speed.
Availability
SN74ALS244C-1NSR is available at Aetrix Electronics and suitable for industrial control panels, retro-computing upgrades, and embedded bus expansion modules requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS244C-1NSR 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 50 years of innovation in industrial and automotive electronics.
The SN74ALS244C-1NSR belongs to TI's legacy TTL-compatible logic portfolio, engineered for backward compatibility, bus integrity, and robust operation in harsh industrial environments.
FAQ
What is the maximum recommended output sink current for SN74ALS244C-1NSR?
The SN74ALS244C-1NSR is rated for a maximum low-level output current (IOL) of 48 mA per output when VCC is between 4.75 V and 5.25 V. This value is specified in the "-1" variant's electrical characteristics table and distinguishes it from the standard SN74ALS244C (24 mA). Exceeding this limit may cause excessive voltage drop or thermal stress.
Does SN74ALS244C-1NSR support mixed-voltage interfacing with 3.3 V logic?
No - SN74ALS244C-1NSR is a 5 V-only TTL-compatible device with VIH = 2.0 V minimum and VIL = 0.8 V maximum. While its inputs may accept 3.3 V logic HIGH levels, its outputs swing rail-to-rail (0.4 V/3.2 V) at 5 V and are not 3.3 V tolerant. Direct connection to 3.3 V CMOS inputs requires level-shifting or series termination.
What is the pin 10 function on SN74ALS244C-1NSR, and how does it differ from other packages?
On the SOP-20 (NS) package, pin 10 is GND - unlike the DIP-20 (N) or SOIC-20 (DW) variants where pin 10 is 2OE. This difference is confirmed by TI's NS package drawing and tape-and-reel documentation. Always verify pinout against the specific package's mechanical drawing before PCB layout.
Can SN74ALS244C-1NSR replace SN74ALS244CNSR in an existing design?
Yes - SN74ALS244C-1NSR and SN74ALS244CNSR share identical SOP-20 (NS) packaging, pinout, and operating temperature range (0°C to 70°C). The only functional difference is the enhanced 48 mA IOL in the -1 version versus 24 mA in the standard version. No PCB changes are required if the load remains within 24 mA.
What is the typical power consumption of SN74ALS244C-1NSR under active drive conditions?
At VCC = 5.5 V, the SN74ALS244C-1NSR draws up to 24 mA ICC when all outputs are low (per datasheet Table 3), and 27 mA when outputs are disabled. Typical active power dissipation is ~132 mW (5.5 V × 24 mA), significantly lower than AS-family equivalents due to ALS process optimization.
SN74ALS244C-1NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS244C-1NSR FAQ
1.How can I place an order for SN74ALS244C-1NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS244C-1NSR 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 SN74ALS244C-1NSR reliable?
The price and inventory of SN74ALS244C-1NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS244C-1NSR is usually 5 days.
3.What payment methods are accepted for SN74ALS244C-1NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS244C-1NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS244C-1NSR?
SN74ALS244C-1NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS244C-1NSR 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 SN74ALS244C-1NSR?
For technical support, including SN74ALS244C-1NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS244C-1NSR requirements.
6.How does Aetrix verify that SN74ALS244C-1NSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS244C-1NSR 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 SN74ALS244C-1NSR meets industry standards.
7.What is the process for return or replacement of SN74ALS244C-1NSR?
All SN74ALS244C-1NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS244C-1NSR, 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 SN74ALS244C-1NSR part is unused and in its original packaging.
Return procedure for SN74ALS244C-1NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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