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Texas Instruments SN74ALS244C-1DW
- Part No.:
- SN74ALS244C-1DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS244C-1DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:402
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Product details
Overview
SN74ALS244C-1DW from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in TTL-compatible systems. It features dual 4-bit groups, symmetrical active-low output-enable (OE) inputs, pnp input structure for reduced DC loading, 48 mA low-level output current capability, and operates over 0°C to 70°C.
For engineers reviewing the SN74ALS244C-1DW datasheet, SN74ALS244C-1DW pinout, SN74ALS244C-1DW application, or SN74ALS244C-1DW equivalent, key selection criteria include its -1 version's enhanced IOL rating, SOIC-20 package compatibility, 3-state bus interface behavior, and ALS logic family timing performance under 50 pF load conditions.
Technical Context
The SN74ALS244C-1DW implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low OE input (1OE and 2OE). Its pnp input stage minimizes input current draw, improving fanout in dense address/data bus configurations.
It supports true 3-state operation with specified tPZH/tPZL disable times (max 20 ns) and tPHZ/tPLZ enable times (max 10 ns) at VCC = 4.5–5.5 V and CL = 50 pF, enabling reliable bus arbitration in synchronous memory and peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), TTL-compatible input thresholds and output drive |
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5 V ±10% rails |
| Low-Level Output Current (IOL) | 48 mA (–1 version only) - enables direct drive of heavy capacitive loads or multiple TTL inputs |
| Propagation Delay (tPLH/tPHL) | 2–10 ns - supports high-speed address buffering up to ~100 MHz system clock domains |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications |
| Package | SOIC-20 (DW) - surface-mount footprint compatible with automated PCB assembly |
| 3-State Enable Timing | tPZH ≤ 20 ns, tPHZ ≤ 10 ns - guarantees fast bus release and acquisition for time-critical shared-bus protocols |
Pinout & Package
SN74ALS244C-1DW uses a 20-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, 7.5 mm body width, and 2.65 mm max height per JEDEC MS-013. Pin 1 is located at the top-left corner with a beveled edge or index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for first and second 4-bit buffer groups |
| 2–5, 13–16 | 1A1–1A4, 2A1–2A4 | Non-inverting input terminals for eight buffer channels |
| 6–9, 11–14 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered output terminals - high-Z when corresponding OE is high |
| 10 | GND | Ground reference for all logic and output stages |
| 20 | VCC | +5 V supply for internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Enables bidirectional bus sharing without external isolation components |
| pnp Input Structure | Reduces input current to ≤ –0.1 mA, increasing fanout in address register chains |
| –1 Version IOL Rating | 48 mA sink capability allows direct connection to 10+ standard TTL loads |
| Dual Independent OE Inputs | Permits selective enabling of upper/lower nibbles for partial bus control |
| TTL-Compatible Thresholds | VIH = 2.0 V, VIL = 0.8 V - interoperable with legacy 74LS/74S logic families |
Applications
| Memory Address Buffering | Parallel Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU address outputs during DMA cycles. Use Value: 48 mA IOL ensures full logic swing into 100 pF+ trace capacitance; fast 10 ns enable timing prevents bus contention. | Use Scenario: Interfacing an 8-bit microcontroller data bus to external peripherals via a common parallel port. IC Role / Device Role / Timing Role: Direction-controlled line driver enabling bidirectional data flow using OE signals. Use Value: Dual OE inputs allow independent control of upper/lower byte lanes; 20 ns disable time guarantees clean bus release before next transfer. |
| Industrial I/O Expansion | Legacy System Bus Isolation |
Use Scenario: Expanding GPIO count on a PLC controller by buffering digital input/output signals to field devices. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between MCU I/O and optocoupler or relay driver inputs. Use Value: pnp inputs reduce MCU port loading; 48 mA sink drives LED indicators or small solenoids directly. | Use Scenario: Isolating aging 74LS-based subsystems from newer FPGA-based controllers in retrofitted equipment. IC Role / Device Role / Timing Role: TTL-compatible voltage-level translator and bus driver maintaining signal integrity across technology boundaries. Use Value: Identical VIH/VIL thresholds and VOH/VOL specs ensure drop-in compatibility; SOIC-20 footprint simplifies board replacement. |
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 with 24 mA IOL (vs. 48 mA for -1); otherwise identical pinout, timing, and electrical specs | Suitable where lower drive strength suffices; not interchangeable in high-fanout or heavy-capacitance designs | Select SN74ALS244CDWR only if load requirements are ≤24 mA per output |
| SN74AS244ADWR | AS family: faster propagation delay (6.2 ns vs. 10 ns), higher ICC (60 mA vs. 24 mA), 64 mA IOL, but higher power consumption | Better for ultra-high-speed timing-critical paths; less suitable for power-constrained or thermally sensitive layouts | Choose SN74AS244ADWR when speed >100 MHz bus operation is required and power budget allows |
Compared with SN74ALS244CDWR and SN74AS244ADWR, the SN74ALS244C-1DW uniquely balances enhanced drive (48 mA), low power (24 mA ICC), and commercial-temperature reliability-making it optimal for cost-sensitive, medium-speed industrial bus interfaces where robustness and compatibility outweigh raw speed.
Availability
SN74ALS244C-1DW is available at Aetrix Electronics and suitable for memory address buffering, parallel bus transceivers, industrial I/O expansion, and legacy system bus isolation requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS244C-1DW 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74ALS244C-1DW belongs to TI's legacy ALS logic family, engineered for high-speed, low-power TTL-compatible interfacing in memory subsystems and industrial control backplanes.
FAQ
What is the maximum recommended output current for SN74ALS244C-1DW?
The SN74ALS244C-1DW is rated for a maximum low-level output current (IOL) of 48 mA per channel when VCC is between 4.75 V and 5.25 V. This is the defining feature of the "–1" suffix variant and exceeds the 24 mA rating of the standard SN74ALS244C. Exceeding this value risks parametric shift or thermal stress.
Does SN74ALS244C-1DW support hot-swap or live-insertion?
No, SN74ALS244C-1DW does not support hot-swap operation. Its absolute maximum ratings specify that voltage applied to a disabled 3-state output must not exceed 5.5 V, and no bus-hold, power-up sequencing, or Ioff protection is included. Live insertion into a powered bus may cause latch-up or damage due to uncontrolled current paths.
Is SN74ALS244C-1DW pin-compatible with SN74LS244N?
Yes, SN74ALS244C-1DW is functionally and pinout-compatible with SN74LS244N in terms of logic behavior and terminal assignment, but differs in package (SOIC-20 vs. PDIP-20) and electrical specs: ALS offers faster speed (10 ns vs. 15 ns), lower power (24 mA ICC vs. 34 mA), and higher IOL (48 mA vs. 24 mA). PCB layout adaptation is required for SOIC mounting.
What is the purpose of the pnp input structure in SN74ALS244C-1DW?
SN74ALS244C-1DW uses pnp input transistors to reduce input current draw - limiting IIH to +20 µA and IIL to –0.1 mA. This lowers DC loading on upstream drivers, increases effective fanout, and improves noise margin in high-density address or control bus applications where dozens of inputs share a single source.
Can SN74ALS244C-1DW operate at 3.3 V supply?
No, SN74ALS244C-1DW is not specified for 3.3 V operation. Its recommended VCC range is 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. At 3.3 V, the device will fail to meet VIH (2.0 V min) and VOH (2.4 V min) specifications, resulting in unreliable logic levels and potential functional failure.
SN74ALS244C-1DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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, 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-1DW FAQ
1.How can I place an order for SN74ALS244C-1DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS244C-1DW 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-1DW reliable?
The price and inventory of SN74ALS244C-1DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS244C-1DW is usually 5 days.
3.What payment methods are accepted for SN74ALS244C-1DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS244C-1DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS244C-1DW?
SN74ALS244C-1DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS244C-1DW 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-1DW?
For technical support, including SN74ALS244C-1DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS244C-1DW requirements.
6.How does Aetrix verify that SN74ALS244C-1DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS244C-1DW 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-1DW meets industry standards.
7.What is the process for return or replacement of SN74ALS244C-1DW?
All SN74ALS244C-1DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS244C-1DW, 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-1DW part is unused and in its original packaging.
Return procedure for SN74ALS244C-1DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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