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Texas Instruments SN74ALS244C-1DB
- Part No.:
- SN74ALS244C-1DB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS244C-1DB.pdf
- Description:
- BUFFER/LINE DRIVER 8-CH
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Inventory:6,072
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Product details
Overview
SN74ALS244C-1DB from Texas Instruments is an octal 3-state buffer/line driver IC designed for memory address and bus driving applications. It features non-inverting outputs, dual 4-bit groups with independent 3-state enable inputs (1OE, 2OE), 48 mA low-level output current capability (IOL), TTL-compatible input thresholds, and operates from 4.5 V to 5.5 V over 0°C to 70°C.
For engineers reviewing the SN74ALS244C-1DB datasheet, SN74ALS244C-1DB pinout, SN74ALS244C-1DB application, or SN74ALS244C-1DB equivalent, key selection criteria include guaranteed 48 mA sink drive strength, fast 3-state enable/disable timing (tPZL ≤ 20 ns, tPHZ ≤ 10 ns), compatibility with legacy TTL bus systems, and SSOP-20 packaging for high-density PCB layouts.
Technical Context
This device implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low 3-state enable input (1OE for Y1–Y4, 2OE for Y5–Y8). The pnp-input structure reduces DC loading on driving sources, improving fan-out in address/data bus configurations.
It supports bidirectional bus interfacing via 3-state outputs that present high impedance (IOZH ≤ ±20 µA) when disabled. Propagation delays are tightly specified: tPLH/tPHL ≤ 10 ns at VCC = 5 V, CL = 50 pF, enabling reliable operation in 20+ MHz address strobe environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic rails and tolerant of typical power rail variation |
| Low-Level Output Current (IOL) | 48 mA - enables direct drive of heavy capacitive loads (e.g., >100 pF buses) without external buffers |
| Propagation Delay (tPLH/tPHL) | ≤10 ns - supports address/data bus timing in systems with ≥20 MHz clock domains |
| 3-State Disable Time (tPZL) | ≤20 ns - ensures clean bus release before next cycle, preventing contention in shared-memory systems |
| Input Threshold (VIL/VIH) | 0.8 V / 2.0 V - fully compatible with standard TTL input logic levels and noise margins |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and computing equipment |
| Output Leakage (IOZL/IOZH) | ±20 µA - guarantees minimal bus leakage during 3-state hold, critical for low-power standby modes |
Pinout & Package
SN74ALS244C-1DB uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, 7.5 mm body width, and 2.0 mm max height - optimized for space-constrained PCBs while maintaining hand-solderability and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Group 1 Output Enable | Active-low control for Y1–Y4; asserts 3-state when high, enables buffer when low |
| 2–5 (1A1–1A4) | Group 1 Inputs | Non-inverting data inputs driving outputs Y1–Y4 respectively |
| 6, 19 (GND, VCC) | Power Supply | Ground reference and +5 V supply pins - require local 0.1 µF decoupling per package |
| 7–10 (2Y4–2Y1) | Group 2 Outputs | Non-inverting buffered outputs for inputs 2A4–2A1 (pins 17–14) |
| 11–14 (2A4–2A1) | Group 2 Inputs | Non-inverting data inputs driving outputs Y5–Y8 (pins 7–10) |
| 15 (2OE) | Group 2 Output Enable | Active-low control for Y5–Y8; independent of Group 1 for flexible bus partitioning |
| 16–18 (1Y1–1Y4) | Group 1 Outputs | Non-inverting buffered outputs for inputs 1A1–1A4 (pins 2–5) |
Key Features
| Feature | Design Value |
|---|---|
| 48 mA IOL drive strength | Eliminates need for external bus transceivers in high-capacitance memory address routing |
| Dual independent 3-state enables | Allows selective activation of upper/lower address byte lanes without gating logic |
| pnp input structure | Reduces input current loading to ≤ –0.1 mA, increasing fan-out to ≥20 LS-TTL loads |
| SSOP-20 package | Provides 45 % board area reduction vs. PDIP-20 while supporting automated assembly |
| TTL-compatible voltage thresholds | Ensures interoperability with legacy 74LS/74ALS logic families without level-shifting |
Applications
| Memory Address Buffering | Bus Interface Isolation |
|---|---|
Use Scenario: Driving 16-bit address bus lines from microprocessor address latch outputs in embedded controllers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing isolation and drive strength for A0–A15 signals. Use Value: Guaranteed 48 mA sink current ensures full logic swing across 100+ pF trace capacitance, eliminating signal degradation at 10 MHz address strobes. | Use Scenario: Isolating CPU data bus from peripheral I/O devices sharing same physical traces. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE controls enabling time-multiplexed access. Use Value: Sub-20 ns 3-state disable time prevents bus contention during arbitration transitions between master and slave devices. |
| Legacy System Upgrades | Industrial Control Backplanes |
Use Scenario: Replacing obsolete 74LS244 in aging PLC mainboards requiring extended lifetime support. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement with enhanced drive and lower input loading. Use Value: pnp-input design reduces input current to 1/5 that of LS-series, lowering total system power by ~150 mW per device. | Use Scenario: Driving parallel control signals (e.g., stepper motor enable, relay drivers) across 200 mm backplane traces. IC Role / Device Role / Timing Role: High-current line driver buffering TTL-level commands from controller to remote modules. Use Value: 48 mA output capability sustains valid logic levels over 50 Ω characteristic impedance traces with 30 pF/m loading. |
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 |
|---|---|---|---|
| SN74ALS244C-1N | Same electrical specs but in 20-pin PDIP package (6.35 mm pitch, 24.2 mm length) | Preferred for through-hole prototyping, manual repair, or legacy wave-solder processes | Select when board assembly uses through-hole technology or requires field serviceability |
| SN74AS244ADBR | AS-family variant: faster propagation (tPLH ≤ 6.2 ns) but higher ICC (60 mA active vs. 24 mA for ALS) | Better suited for high-speed timing-critical paths where power budget allows | Choose for sub-10 ns timing budgets; avoid if thermal or power constraints limit dissipation |
Compared with SN74ALS244C-1N and SN74AS244ADBR, the SN74ALS244C-1DB delivers optimal balance of compact SSOP packaging, robust 48 mA drive, and low static power - making it ideal for space-constrained industrial controllers where reliability and legacy compatibility are prioritized over peak speed.
Availability
SN74ALS244C-1DB is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system upgrades, memory address buffering, and bus interface isolation requiring stable component supply across long production lifecycles.
Supply support for SN74ALS244C-1DB 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 connectivity solutions for industrial, automotive, and communications markets.
The SN74ALS244C-1DB belongs to TI's legacy 74ALS logic family, engineered for high fan-out, low input loading, and robust bus-driving performance in commercial-grade computing and control systems.
FAQ
What is the maximum recommended output current for SN74ALS244C-1DB?
The SN74ALS244C-1DB 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 explicitly defined for the "-1" version in the datasheet and distinguishes it from the standard SN74ALS244C, which specifies only 24 mA. Exceeding this rating risks parametric shift or accelerated wear.
Does SN74ALS244C-1DB support mixed-voltage interfacing?
No, SN74ALS244C-1DB is strictly a 5 V TTL-family device with VIH = 2.0 V and VIL = 0.8 V. It does not support 3.3 V or 2.5 V logic levels natively. Interfacing with lower-voltage systems requires external level-shifting circuitry, as the input thresholds and output VOH/VOL are specified only for 4.5–5.5 V operation.
What package type is used for SN74ALS244C-1DB?
SN74ALS244C-1DB uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.5 mm body width, and 2.0 mm maximum height. This package is RoHS-compliant, tape-and-reel packaged (2000 units per reel), and qualified for reflow soldering per JEDEC Level-1 standards.
How does the pnp input structure benefit SN74ALS244C-1DB in bus applications?
The pnp input structure in SN74ALS244C-1DB reduces input current loading to ≤ –0.1 mA (vs. –1.6 mA in standard TTL), allowing one output to drive up to 20 LS-TTL inputs without degradation. This directly improves fan-out capability and lowers cumulative loading on upstream address latches or microcontroller GPIOs.
Can SN74ALS244C-1DB be used in place of SN74LS244?
Yes, SN74ALS244C-1DB is a functional and pin-compatible upgrade to SN74LS244, offering identical pinout, logic function, and voltage thresholds. Key improvements include 2× higher IOL (48 mA vs. 24 mA), lower input current (–0.1 mA vs. –1.6 mA), and improved noise immunity - all without requiring PCB layout changes.
SN74ALS244C-1DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS244C-1DB FAQ
1.How can I place an order for SN74ALS244C-1DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS244C-1DB 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-1DB reliable?
The price and inventory of SN74ALS244C-1DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS244C-1DB is usually 5 days.
3.What payment methods are accepted for SN74ALS244C-1DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS244C-1DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS244C-1DB?
SN74ALS244C-1DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS244C-1DB 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-1DB?
For technical support, including SN74ALS244C-1DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS244C-1DB requirements.
6.How does Aetrix verify that SN74ALS244C-1DB is sourced from the original manufacturer or authorized distributors?
All SN74ALS244C-1DB 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-1DB meets industry standards.
7.What is the process for return or replacement of SN74ALS244C-1DB?
All SN74ALS244C-1DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS244C-1DB, 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-1DB part is unused and in its original packaging.
Return procedure for SN74ALS244C-1DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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