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Texas Instruments SN74ALS244C-1DWR
- Part No.:
- SN74ALS244C-1DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS244C-1DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
SN74ALS244C-1DWR from Texas Instruments is an octal 3-state buffer/line driver designed for memory address and bus driving in TTL-compatible systems. It features dual 4-bit non-inverting channels, 20-pin SOIC (DW) package, 48 mA low-level output current (IOL), 0°C to 70°C operating temperature, and pnp input structure reducing DC loading. It drives bus lines or buffers memory address registers in industrial control and legacy computing interfaces.
For engineers reviewing the SN74ALS244C-1DWR datasheet, SN74ALS244C-1DWR pinout, SN74ALS244C-1DWR application, or SN74ALS244C-1DWR equivalent, key selection criteria include 3-state bus isolation capability, guaranteed 48 mA sink drive at VCC = 4.75–5.25 V, SOIC-20 thermal and layout compatibility, and ALS logic family propagation delay (tPLH/tPHL ≤ 10 ns).
Technical Context
This device implements two independent 4-bit non-inverting buffer sections, each with active-low 3-state enable (1OE, 2OE). Its pnp input stage minimizes input current draw, improving fanout in dense TTL bus systems. The -1 suffix denotes enhanced output drive: IOL = 48 mA (vs. 24 mA in standard SN74ALS244C), validated only under 4.75–5.25 V supply conditions.
It operates strictly within 4.5–5.5 V supply range and supports bidirectional bus interfacing via high-impedance outputs when disabled. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V, ensuring robust noise margin against TTL logic levels across its full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances speed (≤10 ns propagation) and power (ICC ≤ 24 mA active) |
| Output Drive (IOL) | 48 mA max - enables direct drive of heavy capacitive buses or multiple TTL inputs without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - ensures timing compliance in 25 MHz+ address/data bus applications |
| 3-State Enable Time | tPZL ≤ 20 ns, tPHZ ≤ 10 ns - supports fast bus arbitration and multiplexing cycles |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails; absolute max 7 V |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial embedded systems, not extended/military grade |
| Input Structure | pnp-based - reduces input current (IIL ≤ –0.1 mA), increasing effective fanout in bus-loaded designs |
Pinout & Package
SN74ALS244C-1DWR uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, and 2.65 mm max height per JEDEC MS-013. Pin 1 index located at top-left corner (Q1 quadrant in tape).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Disables both 4-bit sections simultaneously; asserted low enables outputs, high places Y1–Y4 and 2Y1–2Y4 in high-Z state |
| 1A1–1A4, 2A1–2A4 | Non-inverting data inputs | Eight independent TTL-compatible inputs; each directly drives corresponding output without inversion |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Eight high-drive, non-inverting outputs; each sinks up to 48 mA when enabled and low |
| VCC (Pin 20) | Positive supply | 5 V nominal supply connection; decoupling capacitor required near pin for noise immunity |
| GND (Pin 10) | Ground reference | Common return path for all inputs, outputs, and internal logic; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Output Sink Current | 48 mA per output (–1 version), enabling direct interface to 10+ standard TTL loads or long PCB traces |
| Low DC Input Loading | pnp input structure limits IIL to –0.1 mA, increasing effective fanout by ~3× vs. standard TTL buffers |
| Fast 3-State Switching | tPZL ≤ 20 ns and tPHZ ≤ 10 ns ensure minimal bus contention during enable/disable transitions |
| SOIC-20 Package | Surface-mount DW package with industry-standard footprint, reflow-compatible (MSL Level-1), and 2000-unit tape-and-reel packaging |
| TTL-Compatible Thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V guarantee interoperability with legacy 74LS/74F and microcontroller GPIOs |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Buffering 16-bit address bus between microprocessor and multiple memory chips in industrial PLCs. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU address lines from memory decode logic; enables time-multiplexed access to ROM/RAM banks. Use Value: 48 mA sink drive ensures clean signal integrity across 15 cm PCB traces loaded with 8+ TTL inputs; tPHL ≤ 10 ns prevents address setup violations. | Use Scenario: Isolating shared data bus between MCU and peripheral ICs (ADC, DAC, UART) in test equipment. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent 1OE/2OE controls allowing selective peripheral enablement without software overhead. Use Value: Fast tPZL ≤ 20 ns and tPHZ ≤ 10 ns minimize bus turnaround latency; high-Z state prevents signal contention during multi-peripheral transactions. |
| Legacy System Interface | Industrial I/O Expansion |
Use Scenario: Interfacing modern FPGA I/O banks to legacy TTL backplane in avionics maintenance rigs. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer translating 3.3 V FPGA outputs to robust 5 V TTL bus signals. Use Value: pnp inputs accept 3.3 V logic highs as valid VIH; 48 mA drive overcomes backplane capacitance (>100 pF) without signal degradation. | Use Scenario: Driving 24 V optocoupler inputs from 5 V controller outputs in factory automation I/O modules. IC Role / Device Role / Timing Role: High-current buffer stage between microcontroller GPIO and discrete transistor switch controlling optocoupler LED strings. Use Value: Guaranteed 48 mA sink capability allows direct drive of multiple parallel optocouplers (e.g., 4× TLP521) without external transistors. |
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 |
|---|---|---|---|
| SN74ALS244CDWR | Standard version: IOL = 24 mA (not 48 mA); identical pinout, timing, and package | Suitable where bus load is lighter (<5 TTL loads) or lower power consumption is prioritized | Select SN74ALS244CDWR if 48 mA drive is unnecessary and cost optimization is critical |
| SN74AS244ADWR | AS family: faster tPLH/tPHL ≤ 6.2 ns but higher ICC (≤90 mA); same 20-pin SOIC package | Better for high-speed timing-critical paths (e.g., >33 MHz buses), less suitable for power-constrained designs | Choose SN74AS244ADWR only when sub-7 ns propagation is mandatory and power budget allows ≥3× higher active current |
Compared with SN74ALS244CDWR and SN74AS244ADWR, SN74ALS244C-1DWR uniquely delivers 48 mA drive at ALS power efficiency-making it optimal for medium-speed, high-fanout industrial bus interfaces where reliability and thermal margin outweigh raw speed or minimal current draw.
Availability
SN74ALS244C-1DWR is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and legacy system interfacing requiring stable component supply and long-term industrial availability.
Supply support for SN74ALS244C-1DWR 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 delivering analog, embedded processing, and logic solutions since 1930, with deep expertise in industrial, automotive, and communications markets.
SN74ALS244C-1DWR belongs to TI's legacy TTL logic portfolio, engineered for robustness and interoperability in industrial control, test equipment, and retro-computing systems requiring proven 5 V logic performance.
FAQ
What is the maximum output sink current specification for SN74ALS244C-1DWR?
The SN74ALS244C-1DWR is rated for a maximum low-level output current (IOL) of 48 mA per output, but this value is guaranteed only when VCC is maintained between 4.75 V and 5.25 V. At nominal 5 V operation and 25°C, typical IOL exceeds 48 mA, supporting reliable drive of heavy capacitive or resistive bus loads without external amplification.
Does SN74ALS244C-1DWR support operation outside the 0°C to 70°C range?
No. SN74ALS244C-1DWR is characterized and specified only for operation from 0°C to 70°C. It is not rated for extended temperature ranges such as –40°C to 85°C or military –55°C to 125°C. For those environments, consider SN54ALS244C (military-grade) or consult TI's qualified space/military variants.
Can SN74ALS244C-1DWR be used as a drop-in replacement for SN74ALS244CDWR?
Yes, SN74ALS244C-1DWR is pin-compatible and functionally identical to SN74ALS244CDWR except for its enhanced 48 mA IOL rating (vs. 24 mA). All timing, voltage thresholds, and enable logic remain unchanged. No PCB changes are required, though users should verify that the higher drive capability does not overstress downstream components.
What is the purpose of the pnp input structure in SN74ALS244C-1DWR?
SN74ALS244C-1DWR uses pnp input transistors to reduce input current draw: IIL is limited to –0.1 mA (max) and IIH to 20 µA (max). This lowers DC loading on driving sources, increasing effective fanout-especially critical in bus systems where one output may drive multiple SN74ALS244C-1DWR inputs without violating TTL fanout rules.
Is SN74ALS244C-1DWR RoHS compliant and lead-free?
Yes. SN74ALS244C-1DWR is RoHS compliant with NiPdAu (NIPDAU) lead finish, MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), and fully compatible with standard Pb-free reflow profiles. The part marking "ALS244C-1" appears on the top surface, and reel packaging follows TI's standard 2000-unit large tape-and-reel format.
SN74ALS244C-1DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- 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, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS244C-1DWR FAQ
1.How can I place an order for SN74ALS244C-1DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS244C-1DWR 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-1DWR reliable?
The price and inventory of SN74ALS244C-1DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS244C-1DWR is usually 5 days.
3.What payment methods are accepted for SN74ALS244C-1DWR?
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4.How is shipping managed for SN74ALS244C-1DWR?
SN74ALS244C-1DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS244C-1DWR 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-1DWR?
For technical support, including SN74ALS244C-1DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS244C-1DWR requirements.
6.How does Aetrix verify that SN74ALS244C-1DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS244C-1DWR 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-1DWR meets industry standards.
7.What is the process for return or replacement of SN74ALS244C-1DWR?
All SN74ALS244C-1DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS244C-1DWR, 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-1DWR part is unused and in its original packaging.
Return procedure for SN74ALS244C-1DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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