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Texas Instruments SN74AS244ANSR
- Part No.:
- SN74AS244ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AS244ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,953
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Product details
Overview
SN74AS244ANSR 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 20-pin SOP (NS) packaging, operates from 0°C to 70°C, supports 48 mA low-level output current, and delivers propagation delays as low as 2 ns (tPHL) under 50 pF load - enabling high-speed data routing in industrial control backplanes and legacy computing interfaces.
For engineers reviewing the SN74AS244ANSR datasheet, SN74AS244ANSR pinout, SN74AS244ANSR application, or SN74AS244ANSR equivalent, this page provides verified electrical specifications, functional pin mapping, real-world use cases in bus isolation and address buffering, and two validated alternative parts with documented performance trade-offs.
Technical Context
The SN74AS244ANSR implements dual 4-bit non-inverting buffers, each controlled by independent active-low 3-state enable inputs (1OE, 2OE). Its AS-family silicon delivers faster switching than ALS variants, with tPLH/tPHL ≤ 6.2 ns and tPZL/tPLZ ≤ 9 ns at VCC = 5 V and CL = 50 pF.
It uses bipolar Schottky-clamped transistor logic for improved speed-power balance, supports TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V), and maintains rail-to-rail output swing (VOH ≥ 2.4 V at IOL = 48 mA, VOL ≤ 0.55 V) - critical for noise-immune signal integrity in multi-drop bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal non-inverting buffer with dual 3-state enables (1OE, 2OE) |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails |
| Output Drive | ±48 mA low-level / –15 mA high-level - drives heavy capacitive loads and long traces |
| Propagation Delay | 2 ns (tPHL, min) - enables sub-500 MHz bus timing margins |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control systems |
| Package | 20-pin SOP (NS), 0.300" body width, RoHS-compliant NIPDAU finish |
| 3-State Enable Time | 1 ns (tPHZ, min) - rapid bus release minimizes contention windows |
Pinout & Package
SN74AS244ANSR is housed in a 20-pin Small Outline Package (SOP-NS), 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, with gull-wing leads and exposed pad not present. Pin 1 is located at the top-left corner marked by a beveled edge or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - disable all four outputs in respective group when high |
| 2–5, 13–16 | 1A1–1A4, 2A1–2A4 | Non-inverting input terminals - pass logic state directly to corresponding outputs |
| 6–9, 11–14 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - high-impedance when OE is high, otherwise replicate A-inputs |
| 10 | GND | Ground reference for all internal circuitry and output drivers |
| 20 | VCC | Positive supply rail (4.5–5.5 V) powering all logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| High-speed AS logic family | 6.2 ns max tPHL ensures compatibility with >100 MHz system clocks in address/data paths |
| Dual independent 3-state control | Separate 1OE/2OE pins allow selective disabling of upper/lower 4-bit groups - essential for bidirectional bus partitioning |
| Robust output drive | 48 mA sink capability sustains signal integrity across 50 cm PCB traces or unterminated stubs |
| TTL-compatible interface | VIH = 2 V / VIL = 0.8 V thresholds guarantee interoperability with legacy 74-series and microcontroller GPIOs |
| Low quiescent current in disabled state | ICC = 34 mA (max) when outputs disabled - reduces standby power in always-on bus controllers |
Applications
| Industrial Backplane Interface | Legacy Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating CPU address bus from multiple peripheral slots in modular PLC chassis. IC Role / Device Role / Timing Role: Bidirectional address driver with per-slot 3-state control to prevent bus contention during hot-swap. Use Value: 2 ns propagation delay and 48 mA drive ensure setup/hold timing compliance across 12-slot backplane with 30 pF/node loading. |
Use Scenario: Driving 16-bit address lines from Z80 or 8086 microprocessor to SRAM and EPROM banks. IC Role / Device Role / Timing Role: Non-inverting buffer amplifying weak microprocessor address outputs while enabling bank-select isolation. Use Value: TTL-compatible VIH/VIL and rail-aligned VOH/VOL eliminate level-shifting components in 5 V-only designs. |
| Test Equipment Signal Routing | Automated Test Fixture Bus Driver |
|
Use Scenario: Multiplexing DUT address/control signals across shared test head cabling in ATE systems. IC Role / Device Role / Timing Role: 3-state-enabled signal router selecting between multiple DUTs on common bus infrastructure. Use Value: 1 ns tPHZ/tPLZ enables <5 ns bus turnaround - critical for cycle-accurate stimulus/response sequencing. |
Use Scenario: Driving parallel control lines (e.g., reset, chip select) to 8+ devices on production test fixture PCB. IC Role / Device Role / Timing Role: High-current buffer compensating for cumulative trace capacitance and connector losses. Use Value: 48 mA sink strength maintains VOL ≤ 0.55 V even with 100 pF total load - ensuring reliable logic-low assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS244CNSR | ALS family: slower (10 ns max tPHL), lower IOL (24 mA), higher noise immunity | Better suited for noise-prone industrial environments where speed is secondary to EMI robustness | Select when prioritizing noise margin over timing closure in 25 MHz or lower systems |
| SN74F244N | F-family: 3.7 ns max tPHL, 20 mA IOL, wider VCC range (4.5–5.5 V), no RoHS option in PDIP | Higher speed than ALS but lower drive than AS; legacy PDIP only (no SOP) | Choose for fastest propagation in through-hole prototyping, accepting reduced output current |
Compared with SN74ALS244CNSR and SN74F244N, the SN74AS244ANSR uniquely balances 6.2 ns speed and 48 mA drive in RoHS-compliant SOP packaging - making it optimal for space-constrained, high-reliability commercial backplanes requiring both timing margin and load tolerance.
Availability
SN74AS244ANSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory subsystems, and automated test equipment requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for SN74AS244ANSR 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 founded in 1930, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.
The SN74AS244ANSR belongs to TI's 74AS logic family - engineered for high-speed, high-drive digital interfacing in commercial-grade systems where timing precision and bus loading resilience are critical.
FAQ
What is the maximum operating temperature range for SN74AS244ANSR?
The SN74AS244ANSR 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 SN54AS244A (–55°C to 125°C), and thermal derating is required above 70°C ambient.
Does SN74AS244ANSR support true bidirectional data flow?
No, the SN74AS244ANSR is a unidirectional non-inverting buffer. It has separate input (A) and output (Y) terminals with no internal direction control. For bidirectional operation, external logic or dedicated transceivers like SN74LS245 must be used alongside SN74AS244ANSR.
What is the recommended PCB layout practice for SN74AS244ANSR's power pins?
Place a 0.1 µF ceramic decoupling capacitor between VCC (pin 20) and GND (pin 10) as close as possible to the package. Use short, wide traces for VCC/GND routing, and avoid sharing power planes with noisy digital switching circuits to maintain output voltage stability under 48 mA transient loads.
Can SN74AS244ANSR drive a 50 Ω transmission line directly?
No - the SN74AS244ANSR is not designed for 50 Ω line driving. Its output structure targets bus loading (typically 50–100 pF), not impedance-matched RF transmission. For 50 Ω lines, use purpose-built line drivers such as SN65LVDS1 or SN75ALS197 with proper termination.
Is SN74AS244ANSR pin-compatible with SN74ALS244CNSR?
Yes - both SN74AS244ANSR and SN74ALS244CNSR use identical 20-pin SOP (NS) packages with matching pinout, footprint, and terminal functions. This allows direct substitution in existing layouts when upgrading speed and drive capability without PCB revision.
SN74AS244ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74AS244ANSR FAQ
1.How can I place an order for SN74AS244ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS244ANSR 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 SN74AS244ANSR reliable?
The price and inventory of SN74AS244ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS244ANSR is usually 5 days.
3.What payment methods are accepted for SN74AS244ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS244ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS244ANSR?
SN74AS244ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS244ANSR 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 SN74AS244ANSR?
For technical support, including SN74AS244ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS244ANSR requirements.
6.How does Aetrix verify that SN74AS244ANSR is sourced from the original manufacturer or authorized distributors?
All SN74AS244ANSR 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 SN74AS244ANSR meets industry standards.
7.What is the process for return or replacement of SN74AS244ANSR?
All SN74AS244ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS244ANSR, 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 SN74AS244ANSR part is unused and in its original packaging.
Return procedure for SN74AS244ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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