My Inquiry
My Account
Texas Instruments SN74AS244ANE4
- Part No.:
- SN74AS244ANE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS244ANE4.pdf
- Description:
- 8-CH, 4.5-V TO 5.5-V BIPOLAR BUF
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AS244ANE4 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 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 to reduce DC loading on upstream logic.
For engineers reviewing the SN74AS244ANE4 datasheet, SN74AS244ANE4 pinout, SN74AS244ANE4 application, or SN74AS244ANE4 equivalent, this device is selected for high-speed bidirectional bus interfacing where low propagation delay (≤6.2 ns), strong sink capability (64 mA), and robust 3-state control are required in industrial control and legacy computing systems.
Technical Context
The SN74AS244ANE4 implements two independent 4-bit groups (1A–1Y and 2A–2Y), each controlled by a dedicated active-low output-enable (OE) input. Its AS-family bipolar design provides faster switching than ALS variants, with guaranteed tPLH/tPHL ≤6.2 ns at VCC = 5 V, CL = 50 pF.
Each buffer exhibits symmetrical active-low OE inputs, pnp-based input stage for reduced input current (IIL = –1 mA max), and rail-to-rail 3-state output disable with leakage <±50 µA. The device is not internally clamped for ESD but relies on external protection per system-level requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL power rails and tolerates supply ripple without functional degradation. |
| IOL (max) | 64 mA - Enables direct drive of heavy capacitive loads (e.g., >100 pF buses) or multiple TTL inputs without external buffering. |
| tPHL / tPLH | ≤6.2 ns - Guarantees sub-7 ns propagation delay under worst-case conditions (VCC = 4.5 V, CL = 50 pF), critical for high-speed address latching. |
| VIH / VIL | 2.0 V / 0.8 V - Matches standard TTL input thresholds, ensuring interoperability with 74LS, 74F, and other TTL-family devices. |
| IOZL / IOZH | ±50 µA - Specifies maximum off-state leakage during 3-state disable, limiting bus contention current in multi-driver configurations. |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade embedded systems, including industrial HMIs and instrumentation front-ends. |
| ICC (outputs low) | 60–90 mA - Indicates total supply current draw when all eight outputs actively sink, informing power budgeting for dense logic boards. |
Pinout & Package
SN74AS244ANE4 uses a 20-pin plastic DIP (PDIP-N) package with 300-mil width, through-hole mounting, and industry-standard pin spacing (0.1 inch). Pin 1 is marked by a notch or dot; the package is RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15, 17 | Input (1A1–1A4, 2A1–2A4) | Eight data inputs grouped as two sets of four; each drives corresponding Y output when OE is asserted. |
| 3, 19 | Output Enable (1OE, 2OE) | Active-low enables for respective 4-bit groups; independent control allows selective bus partitioning. |
| 5, 7, 9, 12, 14, 16, 18, 20 | Output (1Y1–1Y4, 2Y1–2Y4) | Non-inverting buffered outputs; enter high-impedance state when OE = HIGH. |
| 10 | GND | Signal and power reference ground; must be low-impedance connection to minimize noise coupling. |
| 20 | VCC | +5 V supply pin; requires local 0.1 µF ceramic decoupling adjacent to pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Enables bidirectional bus sharing across multiple drivers without external arbitration logic. |
| pnp Input Structure | Reduces input loading to ≤1 mA (vs. ~1.6 mA in standard TTL), easing fanout requirements for upstream gates. |
| High Sink Current | 64 mA per output supports direct interface to LEDs, relays, or legacy TTL loads without series resistors. |
| Low Propagation Delay | 6.2 ns max ensures timing closure in 16 MHz+ address/data paths with minimal skew between channels. |
| Independent OE Control | Two separate OE pins allow dynamic segmentation of the 8-bit bus into two 4-bit domains for partial updates. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or EPROM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control isolates address latch outputs during read cycles and prevents bus contention. Use Value: 64 mA sink capability ensures reliable low-level signaling across long PCB traces with >50 pF load, eliminating need for additional line drivers. | Use Scenario: Interfacing a PLC CPU module to discrete I/O expansion cards via parallel backplane. IC Role / Device Role / Timing Role: Bidirectional data path conditioner that buffers and isolates control signals between master and slave modules. Use Value: Independent 1OE/2OE pins enable selective activation of input vs. output banks, supporting half-duplex protocol handshaking. |
| Legacy Computer Backplane | Test Equipment Signal Routing |
Use Scenario: Replacing failed buffers on vintage 8086/80286-based SBCs requiring drop-in TTL compatibility. IC Role / Device Role / Timing Role: Pin-compatible upgrade path from 74LS244 with improved speed and drive strength. Use Value: Sub-7 ns propagation delay meets tight setup/hold windows of early x86 address latches, preventing timing violations. | Use Scenario: Configurable signal routing matrix in automated test equipment (ATE) for stimulus/response channel selection. IC Role / Device Role / Timing Role: Programmable bus switch controlled by FPGA GPIO to route analog/digital test signals. Use Value: Low 3-state leakage (<50 µA) minimizes crosstalk between unselected channels, preserving signal integrity during multiplexed measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS244CN | Lower drive (24 mA IOL), slower (10 ns max tPHL), lower ICC (24 mA), same pinout and voltage specs. | Suitable for low-power, lower-speed legacy systems where heat dissipation or board space limits higher-current devices. | Select SN74ALS244CN only if timing margin >3 ns exists and bus capacitance <30 pF; otherwise SN74AS244ANE4 ensures robustness. |
| SN74F244N | F-family: 35 mA IOL, 8 ns max tPHL, higher ICC (80 mA), identical pinout and logic function. | Better noise immunity than AS in electrically noisy environments but less drive than AS for heavy loads. | Choose SN74F244N when EMI susceptibility is primary concern and 35 mA drive suffices; SN74AS244ANE4 preferred for maximum speed/load margin. |
Compared with SN74ALS244CN and SN74F244N, the SN74AS244ANE4 delivers the highest sink current (64 mA) and fastest propagation (6.2 ns), making it optimal for timing-critical, high-capacitance bus applications where AS-family speed and drive outweigh power or noise trade-offs.
Availability
SN74AS244ANE4 is available at Aetrix Electronics and suitable for industrial control panels, legacy computer repair, and test equipment manufacturing requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS244ANE4 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 SN74AS244ANE4 belongs to TI's 74AS logic family, engineered for high-speed, high-drive digital interfacing in systems demanding superior timing performance over standard TTL while maintaining pin compatibility with legacy 74-series designs.
FAQ
What is the maximum operating temperature range for SN74AS244ANE4?
The SN74AS244ANE4 is characterized for operation from 0°C to 70°C, meeting commercial-grade environmental requirements. It is not rated for extended temperature ranges like the military-spec SN54AS244AJ (–55°C to 125°C); thermal derating beyond 70°C is not supported per datasheet specifications.
Can SN74AS244ANE4 replace SN74LS244N in an existing design?
Yes, SN74AS244ANE4 is pin-compatible with SN74LS244N and offers improved performance: 64 mA sink vs. 8 mA, 6.2 ns propagation vs. 17 ns, and identical VCC/VIL/VIH thresholds. However, its higher ICC (60–90 mA vs. ~30 mA) requires verification of power delivery and thermal margins in the target PCB layout.
What is the purpose of the two separate OE pins on SN74AS244ANE4?
The SN74AS244ANE4 features two independent active-low output-enable pins (1OE on pin 1, 2OE on pin 19) to control its two 4-bit buffer groups separately. This allows partial bus activation-e.g., enabling only upper nibble for address writes while holding lower nibble in high-Z during data reads-reducing contention and simplifying control logic.
Does SN74AS244ANE4 include internal ESD protection diodes?
No, the SN74AS244ANE4 does not integrate ESD protection diodes per its datasheet. System-level protection (e.g., external TVS or RC filters) is required on all inputs and outputs when deployed in environments with handling or cable-disconnect transients exceeding ±2 kV HBM.
What package type and lead finish does SN74AS244ANE4 use?
SN74AS244ANE4 uses a 20-pin plastic dual in-line package (PDIP-N) with 300-mil width and NiPdAu (nickel-palladium-gold) lead finish. It is RoHS-compliant, tube-packaged (20 units per tube), and designed for through-hole assembly with standard wave solder profiles.
SN74AS244ANE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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, 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
SN74AS244ANE4 FAQ
1.How can I place an order for SN74AS244ANE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS244ANE4 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 SN74AS244ANE4 reliable?
The price and inventory of SN74AS244ANE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS244ANE4 is usually 5 days.
3.What payment methods are accepted for SN74AS244ANE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS244ANE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS244ANE4?
SN74AS244ANE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS244ANE4 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 SN74AS244ANE4?
For technical support, including SN74AS244ANE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS244ANE4 requirements.
6.How does Aetrix verify that SN74AS244ANE4 is sourced from the original manufacturer or authorized distributors?
All SN74AS244ANE4 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 SN74AS244ANE4 meets industry standards.
7.What is the process for return or replacement of SN74AS244ANE4?
All SN74AS244ANE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS244ANE4, 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 SN74AS244ANE4 part is unused and in its original packaging.
Return procedure for SN74AS244ANE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AS244ANE4 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
