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Texas Instruments SN74AS244ANG4
- Part No.:
- SN74AS244ANG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS244ANG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,211
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Product details
Overview
SN74AS244ANG4 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, delivers ±15 mA output drive, supports 0°C to 70°C ambient, and features pnp input structure for reduced DC loading - used in industrial control backplanes and legacy data acquisition systems.
For engineers reviewing the SN74AS244ANG4 datasheet, SN74AS244ANG4 pinout, SN74AS244ANG4 application, or SN74AS244ANG4 equivalent, this page provides verified functional specifications, package-confirmed pin mapping, real-world use cases in bus buffering and address latching, and two validated alternative parts with documented electrical and thermal differences.
Technical Context
This device implements eight independent non-inverting buffers, each with separate active-low 3-state enable (OE) inputs - 1OE controls Y1–Y4, 2OE controls Y5–Y8. Its AS logic family delivers faster propagation delays (tPLH/tPHL ≤ 6.2 ns at VCC = 5 V, CL = 50 pF) and higher drive strength than ALS variants, while maintaining TTL voltage thresholds (VIH = 2 V, VIL = 0.8 V).
The SN74AS244ANG4 uses bipolar transistor-transistor logic with pnp input stages to minimize input current draw (IIL = –1 mA max), enabling high fan-out without excessive loading on upstream drivers. Its 3-state outputs support bidirectional bus contention management and are rated for 64 mA low-level sink current under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) - enables 6.2 ns max propagation delay and 64 mA IOL for high-speed bus driving |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails and tolerant of typical supply ripple |
| Output Drive (IOL) | 64 mA - sufficient to drive 50 Ω transmission lines or multiple TTL inputs without external buffering |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - ensures interoperability with standard TTL and LVTTL logic families |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control panels |
| 3-State Enable Delay | tPZL ≤ 7.5 ns, tPHZ ≤ 6 ns - supports rapid bus arbitration and dynamic signal routing in multiplexed architectures |
| Quiescent Current (ICC) | 34 mA (outputs disabled) - defines worst-case standby power for thermal budgeting in dense PCB layouts |
Pinout & Package
SN74AS244ANG4 is supplied in a 20-pin plastic dual in-line package (PDIP-N), 300-mil width, with standard through-hole mounting and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15, 17 | Input A1–A8 | Eight non-inverting data inputs - A1–A4 routed to first buffer group, A5–A8 to second |
| 3, 5, 7, 9, 12, 14, 16, 18 | Output Y1–Y8 | Eight 3-state buffered outputs - Y1–Y4 controlled by 1OE, Y5–Y8 by 2OE |
| 10 | GND | Signal reference ground - must be connected to system common plane with low-inductance path |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
| 19 | 1OE | Active-low enable for outputs Y1–Y4 - drives all four into high-impedance when high |
| 9 | 2OE | Active-low enable for outputs Y5–Y8 - independent control enables split-bus operation |
Key Features
| Feature | Design Value |
|---|---|
| pnp input structure | Reduces input current draw to ≤1 mA, lowering loading on preceding logic and improving fan-out capability |
| Independent dual OE control | Enables selective activation of two 4-bit groups - critical for segmented address/data bus isolation |
| 64 mA low-level output sink | Drives terminated 50 Ω lines or up to 20 standard TTL loads without external drivers |
| AS-family speed-performance | 6.2 ns max tPHL ensures timing closure in 80 MHz bus cycles with 50 pF load |
| TTL-compatible voltage thresholds | Guarantees interoperability with legacy 74LS, 74ALS, and microcontroller GPIO without level shifting |
Applications
| Memory Address Buffering | Industrial Backplane Interface |
|---|---|
|
Use Scenario: Buffering 16-bit address bus between microprocessor and multiple memory ICs in a PLC mainboard. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU address lines from memory decode logic, enabling time-multiplexed access. Use Value: 64 mA drive strength ensures clean signal edges across 15 cm PCB traces; dual OE allows interleaved memory bank selection. |
Use Scenario: Driving parallel I/O expansion slots in a ruggedized industrial backplane with hot-swap capability. IC Role / Device Role / Timing Role: Bus transceiver providing controlled signal launch onto shared 20-conductor ribbon cable. Use Value: Independent OE pins permit per-slot enable/disable during live insertion; AS speed prevents setup/hold violations at 10 MHz slot rate. |
| Legacy Data Acquisition System | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing 8-channel ADC outputs to a FIFO controller in a benchtop DMM design. IC Role / Device Role / Timing Role: Output latch and bus driver synchronizing sampled data to system clock domain. Use Value: 6.2 ns propagation delay aligns with 80 MHz sampling clock edge; 3-state outputs prevent bus contention during FIFO read/write cycles. |
Use Scenario: Level-shifting and impedance matching for digital stimulus signals in automated test equipment (ATE) pattern generators. IC Role / Device Role / Timing Role: Signal repeater conditioning TTL waveforms before distribution to 16 DUT sites. Use Value: pnp inputs reduce source loading on FPGA I/O banks; 64 mA drive sustains signal integrity over 30 cm coaxial fanout cables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS244CN | ALS family: slower (10 ns max tPHL), lower IOL (24 mA), lower ICC (17 mA) | Suitable for lower-speed, low-power systems where 64 mA drive is unnecessary | Select when thermal budget is constrained and 80 MHz timing margins are not required |
| SN74F244N | F family: 8 ns max tPHL, 20 mA IOL, wider VCC range (4.5–5.5 V), higher ICC (40 mA) | Better noise immunity but insufficient drive for terminated line applications | Prefer for cost-sensitive designs needing moderate speed and proven field reliability over decades |
Compared with SN74ALS244CN and SN74F244N, the SN74AS244ANG4 delivers superior speed and drive strength at the expense of higher quiescent current - making it optimal for high-fanout, high-frequency bus interfaces where signal integrity is prioritized over static power.
Availability
SN74AS244ANG4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy data acquisition systems, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS244ANG4 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 industrial-grade component heritage.
The SN74AS244ANG4 belongs to TI's 74AS logic family - engineered for high-speed, high-drive TTL-compatible applications in mission-critical industrial and instrumentation systems.
FAQ
What is the maximum operating temperature for SN74AS244ANG4?
The SN74AS244ANG4 is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade rating makes it suitable for enclosed industrial enclosures and benchtop test equipment where airflow and thermal design maintain case temperatures within specification. Exceeding 70°C ambient risks parametric shift in propagation delay and output drive capability.
Does SN74AS244ANG4 support true bidirectional data flow?
No - the SN74AS244ANG4 is a unidirectional non-inverting buffer with fixed input-to-output direction (A → Y). While its 3-state outputs allow bus sharing, it lacks internal direction control or complementary input/output pairs required for bidirectional operation. For bidirectional applications, consider the SN74AS245AN transceiver instead.
Can SN74AS244ANG4 replace SN74ALS244CN on the same PCB?
Yes - SN74AS244ANG4 is pin-compatible with SN74ALS244CN in the PDIP-N package and shares identical pinout, voltage thresholds, and logic function. However, SN74AS244ANG4 draws higher supply current (34 mA vs. 17 mA in disabled state) and delivers faster edges, which may require review of decoupling and EMI filtering.
What is the recommended decoupling for SN74AS244ANG4?
A minimum of one 0.1 µF ceramic capacitor placed between VCC (pin 20) and GND (pin 10), with leads ≤2 mm in length, is required per device. For boards with multiple SN74AS244ANG4 units, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point to suppress low-frequency supply droop during simultaneous output switching.
Is SN74AS244ANG4 RoHS compliant?
Yes - SN74AS244ANG4 carries "G4" suffix indicating lead-free (Pb-free) construction with NiPdAu lead finish, fully compliant with RoHS Directive 2011/65/EU. The device meets TI's standard for green packaging and is suitable for export to EU, China, and other regulated markets without exemption requests.
SN74AS244ANG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AS244ANG4 FAQ
1.How can I place an order for SN74AS244ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS244ANG4 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 SN74AS244ANG4 reliable?
The price and inventory of SN74AS244ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS244ANG4 is usually 5 days.
3.What payment methods are accepted for SN74AS244ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS244ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS244ANG4?
SN74AS244ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS244ANG4 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 SN74AS244ANG4?
For technical support, including SN74AS244ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS244ANG4 requirements.
6.How does Aetrix verify that SN74AS244ANG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS244ANG4 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 SN74AS244ANG4 meets industry standards.
7.What is the process for return or replacement of SN74AS244ANG4?
All SN74AS244ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS244ANG4, 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 SN74AS244ANG4 part is unused and in its original packaging.
Return procedure for SN74AS244ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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