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Texas Instruments SN74ABT244ANSR
- Part No.:
- SN74ABT244ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT244ANSR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:488
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Product details
Overview
SN74ABT244ANSR from Texas Instruments is an octal noninverting 3-state buffer/line driver IC in SOIC-20 (NS) package, designed for memory address and bus interface applications. It features high-drive outputs (−32 mA IOH, 64 mA IOL), low output ground bounce (<1 V), and operates over −40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABT244ANSR datasheet, SN74ABT244ANSR pinout, SN74ABT244ANSR application, or SN74ABT244ANSR equivalent, this device is selected for high-density 3-state bus driving where TTL-compatible input thresholds, fast enable/disable timing (tPZL ≤ 6.1 ns), and latch-up immunity (>500 mA) are critical.
Technical Context
The SN74ABT244ANSR implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) inputs. Its EPIC-II™ BiCMOS process enables simultaneous low power dissipation and high current drive capability.
Each buffer passes data from A inputs to Y outputs when OE is low; outputs enter high-impedance state when OE is high. To ensure safe power-up behavior, OE must be pulled up to VCC via external resistor - minimum value determined by driver's sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL systems without level-shifting |
| IOH / IOL | −32 mA / 64 mA - drives heavy capacitive loads and multiple TTL inputs directly |
| tPZL / tPHZ | ≤6.1 ns / ≤6.6 ns - ensures rapid bus release and clean signal isolation during state transitions |
| VOL / VOH | ≤0.55 V @ 64 mA / ≥2.0 V @ −32 mA - maintains valid TTL logic levels under full load |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded and computing environments |
| ESD Rating | 2000 V HBM - withstands handling and board-level electrostatic events without damage |
| Latch-Up | >500 mA per JEDEC JESD-17 - immune to destructive latch-up in noisy power domains |
Pinout & Package
SN74ABT244ANSR uses a 20-pin SOIC (NS) package - 7.5 mm wide, 12.8 mm long, 2.35 mm height - compliant with JEDEC MS-012 and RoHS Green (no Sb/Br) standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19 | Output Enable (Channel 1) | Active-low control for first 4-bit buffer group; ties to VCC via pullup for power-up high-Z safety |
| 2OE, 2 | Output Enable (Channel 2) | Independent active-low control for second 4-bit buffer group; supports staggered bus arbitration |
| 1A1–1A4, 2–4,6,8 | Data Inputs (Channel 1) | Noninverting inputs accepting TTL-level signals; VIH = 2.0 V min ensures noise margin |
| 2A1–2A4, 11,13,15,17 | Data Inputs (Channel 2) | Electrically isolated from Channel 1; allows dual-bus or split-address driving |
| 1Y1–1Y4, 18,16,14,12 | Outputs (Channel 1) | High-drive buffered outputs with controlled VOL/VOLP; suitable for backplane loading |
| 2Y1–2Y4, 9,7,5,3 | Outputs (Channel 2) | Matched propagation delay (tPLH/tPHL ≤ 4.6 ns) to Channel 1 for synchronous bus operation |
| GND, 10 | Ground Reference | Single ground pin shared across both channels; requires low-inductance PCB return path |
| VCC, 20 | Supply Voltage | 5-V nominal supply; decoupling capacitor required within 10 mm of pin for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-II™ BiCMOS Process | Reduces dynamic power vs. pure bipolar while retaining TTL-compatible drive strength |
| High-Drive Outputs | 64-mA sink capability eliminates need for external bus transceivers in mid-density designs |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C prevents false logic transitions during simultaneous output switching |
| Robust ESD/Latch-Up | 2000-V HBM ESD and >500-mA latch-up immunity meet industrial reliability requirements |
| 3-State Control Architecture | Dual independent OE pins enable selective channel disabling without affecting adjacent data paths |
Applications
| Memory Address Buffering | System Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from microcontroller to SRAM or Flash memory arrays. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from memory subsystem during DMA cycles. Use Value: High-current drive (64 mA) ensures fast edge rates into 50-pF trace + load capacitance; tPZL ≤ 6.1 ns guarantees clean bus release before next access. | Use Scenario: Interfacing between legacy ISA-style peripheral controllers and modern FPGA-based bridge logic. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling shared data/address multiplexing with precise OE-controlled directionality. Use Value: Matched tPLH/tPHL (≤4.6 ns) and symmetrical VOH/VOL margins maintain setup/hold timing integrity across all 8 bits. |
| Industrial PLC Backplane | Test Equipment Signal Routing |
Use Scenario: Distributing clock and control signals across modular I/O carrier boards in programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise, high-immunity buffer stage preventing ground bounce coupling into analog sensor modules. Use Value: VOLP < 1 V and >500 mA latch-up rating ensure signal integrity in electrically noisy factory-floor environments. | Use Scenario: Reconfigurable signal routing matrix in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: Programmable 3-state switch enabling dynamic path selection between DUT interface and measurement instrumentation. Use Value: Dual independent OE inputs allow atomic channel enable/disable without glitching adjacent signal paths during reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244ADWR | Same electrical specs; SOIC-20 (DW) package - 7.5 mm width, 12.8 mm length, 2.35 mm height | DW package has slightly larger body footprint than NS but identical pinout and thermal resistance (97°C/W) | Select SN74ABT244ADWR if existing layout uses DW land pattern or requires higher thermal margin |
| SN74ABT244APWR | Same functionality; TSSOP-20 (PW) package - 4.4 mm width, 6.5 mm length, 1.2 mm height | PW offers 45% smaller PCB area and lower profile but higher thermal impedance (128°C/W) | Choose SN74ABT244APWR for space-constrained portable or high-density board designs where thermal load is moderate |
Compared with SN74ABT244ADWR and SN74ABT244APWR, the SN74ABT244ANSR provides identical logic behavior and drive strength in a standard SOIC (NS) variant optimized for legacy compatibility and cost-sensitive industrial production.
Availability
SN74ABT244ANSR is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory subsystems, and test equipment signal routing requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT244ANSR 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 SN74ABT244 series belongs to TI's ABT logic family - engineered for high-speed, high-drive 3-state bus interfacing in memory and system-level applications with strict noise and timing requirements.
FAQ
What is the recommended power-up sequence for SN74ABT244ANSR to avoid bus contention?
TI specifies that OE inputs must be held high (via pullup resistor to VCC) during power-up to force outputs into high-impedance state before internal logic stabilizes. For SN74ABT244ANSR, use a resistor ≤10 kΩ to ensure sufficient sink current margin. This prevents unintended drive onto shared buses during VCC ramp.
Does SN74ABT244ANSR support mixed-voltage operation between 3.3 V and 5 V logic domains?
No - SN74ABT244ANSR is strictly a 5-V device with VCC range 4.5–5.5 V and TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). It does not tolerate 3.3-V inputs without external level translation, nor can it drive 3.3-V receivers without voltage limiting due to VOH ≥ 2.0 V at full load.
How does the latch-up immunity of SN74ABT244ANSR compare to standard 74LS devices?
SN74ABT244ANSR exceeds 500 mA latch-up immunity per JEDEC JESD-17, significantly higher than typical 74LS devices (≈100 mA). This makes SN74ABT244ANSR suitable for harsh industrial environments where transient-induced latch-up could cause system lockup or damage.
Can unused inputs on SN74ABT244ANSR be left floating?
No - TI explicitly states in the datasheet that unused inputs must be held high or low to prevent floating. Floating OE pins risk partial enablement and bus contention; floating A inputs increase ICC and may cause oscillation. Tie unused inputs directly to VCC or GND using short traces.
What is the maximum capacitive load SN74ABT244ANSR can drive while maintaining specified timing?
TI characterizes switching parameters (tPLH, tPHL, tPZL) at CL = 50 pF. While SN74ABT244ANSR can drive heavier loads (e.g., 100 pF) due to its 64-mA IOL, propagation delays increase nonlinearly beyond 50 pF. For designs requiring guaranteed timing, keep total load ≤50 pF - including trace, connector, and receiver input capacitance - or validate timing empirically.
SN74ABT244ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ABT244ANSR FAQ
1.How can I place an order for SN74ABT244ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244ANSR 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 SN74ABT244ANSR reliable?
The price and inventory of SN74ABT244ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244ANSR is usually 5 days.
3.What payment methods are accepted for SN74ABT244ANSR?
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4.How is shipping managed for SN74ABT244ANSR?
SN74ABT244ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT244ANSR 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 SN74ABT244ANSR?
For technical support, including SN74ABT244ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244ANSR requirements.
6.How does Aetrix verify that SN74ABT244ANSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT244ANSR 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 SN74ABT244ANSR meets industry standards.
7.What is the process for return or replacement of SN74ABT244ANSR?
All SN74ABT244ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244ANSR, 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 SN74ABT244ANSR part is unused and in its original packaging.
Return procedure for SN74ABT244ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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