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Texas Instruments SN74ALS244CNSLE
- Part No.:
- SN74ALS244CNSLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS244CNSLE.pdf
- Description:
- BUFFER/LINE DRIVER 8-CH NON-INVE
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Inventory:7,000
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Product details
Overview
SN74ALS244CNSLE from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs, designed for memory address driving and bus interfacing in TTL-compatible systems. It operates from 4.5 V to 5.5 V, delivers ±12 mA output drive, supports 0°C to 70°C industrial temperature range, and features pnp input structure to reduce DC loading - commonly used in legacy industrial control backplanes and parallel data bus isolation.
For engineers reviewing the SN74ALS244CNSLE datasheet, SN74ALS244CNSLE pinout, SN74ALS244CNSLE application, or SN74ALS244CNSLE equivalent, key selection criteria include its 3-state enable timing (tPZL ≤ 24 ns), low-power ALS logic family compatibility, PDIP-20 package footprint, and verified interoperability with SN74LS244 and SN74AS244A in shared-bus memory subsystems.
Technical Context
This device implements two independent 4-bit non-inverting buffer groups (1A→1Y and 2A→2Y), each controlled by a dedicated active-low 3-state enable input (1OE, 2OE). Its pnp input stage lowers input current draw versus standard TTL, improving fan-out in dense address decoding networks.
Propagation delays are tightly specified: tPLH/tPHL ≤ 10 ns at VCC = 5 V, CL = 50 pF; enable/disable times (tPZH/tPLZ) are ≤ 20 ns. The device is not latch-up tested per JEDEC JESD78 but meets MIL-STD-883 Class B screening for qualified variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS), TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) |
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across noisy industrial rails without regulation overhead |
| Output Drive | IOL = 12 mA / IOH = –12 mA - sufficient to drive 10 LS-TTL loads or 50 pF transmission lines |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - enables reliable operation up to ~50 MHz bus clocking in synchronous designs |
| 3-State Enable Time | tPZL ≤ 24 ns, tPHZ ≤ 10 ns - critical for glitch-free bus arbitration in multi-master systems |
| Operating Temperature | 0°C to 70°C - validated for commercial/industrial embedded control cabinets and instrumentation |
| Input Structure | PnP input transistors - reduces input current to ≤ 0.1 mA, minimizing loading on upstream address latches |
Pinout & Package
SN74ALS244CNSLE uses a 20-pin plastic dual in-line package (PDIP-N), 300-mil width, with standard through-hole mounting and 2.54 mm pitch. Pin 1 is marked by a notch or dot; package height is 4.57 mm max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Group 1 Output Enable (active-low) | Disables Y1–Y4 outputs when high; enables them when low - used for bank-select arbitration |
| 1A1–1A4 | Group 1 Input Signals | Non-inverting inputs driving Y1–Y4; compatible with TTL/CMOS logic levels |
| 1Y1–1Y4 | Group 1 Output Signals | 3-state buffered outputs; high-impedance when 1OE = high |
| GND | Ground Reference | Pin 10 - primary return path for all internal logic and output currents |
| VCC | Power Supply | Pin 20 - must be decoupled locally with ≥0.1 µF ceramic capacitor |
| 2OE | Group 2 Output Enable (active-low) | Independent control of Y5–Y8; enables time-multiplexed dual-bus access |
| 2A1–2A4 | Group 2 Input Signals | Second set of non-inverting inputs; electrically isolated from Group 1 |
| 2Y1–2Y4 | Group 2 Output Signals | Outputs Y5–Y8 (labeled 2Y1–2Y4 in datasheet); share same 3-state behavior as Group 1 |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state buffering | Two independent 4-bit channels allow simultaneous or staggered bus access without contention |
| PnP input structure | Reduces input current to ≤100 µA, enabling direct connection to open-collector address drivers |
| TTL-compatible thresholds | VIH = 2.0 V min / VIL = 0.8 V max ensures interoperability with legacy 74LS/74F families |
| Low power consumption | ICC = 15–24 mA (outputs active), 17–27 mA (outputs disabled) - lower than standard 74LS244 |
| Robust 3-state isolation | IOZL/IOZH ≤ ±20 µA - prevents leakage-induced bus corruption during disable state |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microprocessor to multiple memory banks in industrial PLC backplane. IC Role / Device Role / Timing Role: Non-inverting buffer with independent 3-state enables isolates address lines during DMA cycles. Use Value: Prevents address bus contention between CPU and peripheral controllers using synchronized OE strobes. |
Use Scenario: Interfacing 8-bit data bus between legacy microcontroller and external ADC/DAC peripherals. IC Role / Device Role / Timing Role: Bidirectional bus driver with fast enable/disable (tPZL ≤ 24 ns) for time-multiplexed read/write. Use Value: Eliminates need for external bus transceivers; supports clean signal integrity up to 50 MHz burst rates. |
| Legacy System Upgrade | Industrial I/O Expansion |
|
Use Scenario: Replacing obsolete SN74LS244 in field-deployed test equipment requiring extended temperature margin. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade with identical pinout and improved speed/power ratio. Use Value: Reduces system power by ~25% while maintaining full backward compatibility with existing PCB layouts. |
Use Scenario: Expanding GPIO count on programmable logic controller via parallel I/O expansion module. IC Role / Device Role / Timing Role: Level-shifting buffer between 5 V control logic and 3.3 V sensor interface ICs. Use Value: Enables safe 5 V-to-3.3 V interfacing using controlled 3-state transitions and low VOL (≤0.4 V). |
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 |
|---|---|---|---|
| SN74LS244N | Higher ICC (34 mA active), slower tPLH (15 ns), no pnp input - draws more current and generates more heat | Valid for legacy designs where ALS speed/power isn't required; not recommended for new thermal-constrained layouts | Select SN74ALS244CNSLE when lower power, faster switching, or reduced input loading is needed |
| SN74AS244AN | Faster tPLH (6.2 ns), higher IOL (48 mA), wider VCC tolerance (4.5–5.5 V), but higher ICC (60 mA active) | Better suited for high-speed bus termination or driving long traces; requires enhanced thermal management | Choose SN74AS244AN only if propagation delay <7 ns is mandatory and power budget allows +150% increase |
Compared with SN74LS244N and SN74AS244AN, SN74ALS244CNSLE delivers optimal balance of speed (10 ns), power (24 mA active), and input loading (0.1 mA), making it ideal for cost-sensitive industrial control upgrades where thermal headroom and board space are constrained.
Availability
SN74ALS244CNSLE is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment refurbishment, and parallel bus interface modules requiring stable component supply over extended production lifecycles.
Supply support for SN74ALS244CNSLE 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 and automotive electronics.
SN74ALS244CNSLE belongs to TI's legacy TTL logic portfolio, engineered for reliability in industrial control, instrumentation, and military-grade systems where long-term availability and proven field performance are critical.
FAQ
What is the maximum operating temperature for SN74ALS244CNSLE?
The SN74ALS244CNSLE is characterized for operation from 0°C to 70°C, meeting commercial and industrial ambient requirements. It is not rated for extended temperature ranges like the military-grade SN54ALS244C (–55°C to 125°C). Thermal derating is not specified in the datasheet, so operation beyond 70°C may result in undefined timing or increased leakage current. Always verify junction temperature under actual load conditions using θJA = 60°C/W for the PDIP package.
Is SN74ALS244CNSLE pin-compatible with SN74LS244N?
Yes, SN74ALS244CNSLE is fully pin-compatible with SN74LS244N - both use identical 20-pin PDIP packaging and share identical pin assignments for inputs (A1–A4, A5–A8), outputs (Y1–Y4, Y5–Y8), enables (1OE, 2OE), VCC, and GND. No PCB changes are required for drop-in replacement, though layout review should confirm decoupling adequacy given ALS's faster edge rates.
What is the recommended bypass capacitor for SN74ALS244CNSLE?
A minimum 0.1 µF ceramic capacitor placed as close as possible to pins 20 (VCC) and 10 (GND) is recommended for SN74ALS244CNSLE. For systems with high-frequency noise or multiple devices on the same rail, add a bulk 10 µF tantalum or aluminum electrolytic capacitor nearby. This ensures stable VCC during fast 3-state transitions and prevents ground bounce-induced timing errors.
Does SN74ALS244CNSLE support hot-swap insertion?
No, SN74ALS244CNSLE does not support hot-swap insertion. Its absolute maximum rating for voltage applied to a disabled 3-state output is 5.5 V, and no built-in bus-hold, power-up sequencing, or Ioff protection is specified. Insertion into a live bus risks latch-up or output-stage damage due to uncontrolled voltage transients on Y pins before VCC stabilizes.
Can SN74ALS244CNSLE drive a 50-pF capacitive load at 10 MHz?
Yes, SN74ALS244CNSLE is explicitly characterized with CL = 50 pF and R1/R2 = 500 Ω in its switching specifications. At 10 MHz (100 ns period), its worst-case propagation delay (10 ns) and 3-state disable time (24 ns) leave ample setup/hold margin. Measured tPLH/tPHL remains ≤10 ns under these conditions, confirming reliable signal integrity for moderate-speed parallel buses.
SN74ALS244CNSLE 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:
- -
SN74ALS244CNSLE FAQ
1.How can I place an order for SN74ALS244CNSLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS244CNSLE 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 SN74ALS244CNSLE reliable?
The price and inventory of SN74ALS244CNSLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS244CNSLE is usually 5 days.
3.What payment methods are accepted for SN74ALS244CNSLE?
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4.How is shipping managed for SN74ALS244CNSLE?
SN74ALS244CNSLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS244CNSLE 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 SN74ALS244CNSLE?
For technical support, including SN74ALS244CNSLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS244CNSLE requirements.
6.How does Aetrix verify that SN74ALS244CNSLE is sourced from the original manufacturer or authorized distributors?
All SN74ALS244CNSLE 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 SN74ALS244CNSLE meets industry standards.
7.What is the process for return or replacement of SN74ALS244CNSLE?
All SN74ALS244CNSLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS244CNSLE, 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 SN74ALS244CNSLE part is unused and in its original packaging.
Return procedure for SN74ALS244CNSLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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