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Texas Instruments SN74ABT244APWR
- Part No.:
- SN74ABT244APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT244APWR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,202
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Product details
Overview
SN74ABT244APWR from Texas Instruments is an octal noninverting 3-state buffer/line driver with two independent 4-bit sections, each controlled by a dedicated active-low output-enable (OE) input. It delivers high-drive outputs (−32 mA IOH, 64 mA IOL), operates at 4.5–5.5 V, and supports industrial temperature range (−40°C to 85°C). It is used in memory address buffering, clock distribution, and bus-transceiver applications requiring robust drive strength and fast switching.
For engineers reviewing the SN74ABT244APWR datasheet, SN74ABT244APWR pinout, SN74ABT244APWR application, or SN74ABT244APWR equivalent, key selection criteria include its 20-pin TSSOP (PW) package, 3-state output control timing (tPZL = 2.1 ns typ), latch-up immunity (>500 mA), and ESD protection (>2000 V HBM).
Technical Context
This BiCMOS device uses EPIC-IIB design to reduce power dissipation while maintaining TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and rail-to-rail output swing. Its dual 4-bit architecture enables independent enable control per section, supporting asymmetric bus loading and partial bus isolation.
Switching performance is characterized under CL = 50 pF: propagation delay tPLH/tPHL ≤ 4.6 ns (typ 2.6–2.9 ns), and 3-state enable/disable times (tPZH/tPZL/tPHZ/tPLZ) range from 1.1 ns to 5.7 ns. Output ground bounce (VOLP) remains <1 V at VCC = 5 V, TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic systems and tolerates supply ripple without functional degradation. |
| IOH / IOL | −32 mA / 64 mA - Enables direct driving of heavy capacitive loads (e.g., >100 pF buses) or multiple TTL inputs without external buffers. |
| tPLH / tPHL | 1 ns (min) to 4.6 ns (max) at VCC = 5 V - Supports high-speed data paths up to ~200 MHz in short trace configurations. |
| tPZL / tPHZ | 2.1 ns (min) to 6.6 ns (max) - Allows rapid bus arbitration and dynamic bus sharing with minimal contention window. |
| ESD Rating | >2000 V HBM - Provides robust handling margin during PCB assembly and field service without additional protection circuitry. |
| Latch-up Immunity | >500 mA per JEDEC JESD-17 - Guarantees fault tolerance against transient current surges on I/O lines in noisy industrial environments. |
| Operating Temp | −40°C to +85°C - Qualified for use in industrial control, networking infrastructure, and automotive under-hood auxiliary modules. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C reflow compatible).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent gating per 4-bit section; must be pulled high via resistor during power-up to ensure high-impedance default state. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | Accept standard TTL/CMOS logic levels; VIH ≥ 2 V, VIL ≤ 0.8 V ensures reliable interfacing with legacy 5-V microcontrollers and FPGAs. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive bidirectional buses or fan-out to multiple loads; high-impedance state isolates sections when OE is high. |
| VCC (Pin 10) | Power supply | Single 5-V rail powers both input and output stages; decoupling capacitor (0.1 µF) required adjacent to pin. |
| GND (Pin 20) | Ground reference | Common return for all I/O and internal logic; low-inductance connection critical to minimize VOLP and maintain signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| High-drive outputs | 64-mA sink capability eliminates need for external bus drivers in dense PCB layouts with long traces or multiple receivers. |
| EPIC-IIB BiCMOS process | Reduces static power consumption versus standard bipolar TTL while retaining speed and noise immunity advantages. |
| Output ground bounce suppression | VOLP < 1 V at 5 V/25°C ensures stable logic thresholds even during simultaneous output switching events. |
| Robust ESD/latch-up protection | 2000-V HBM ESD rating and >500-mA latch-up immunity allow direct integration into unshielded industrial I/O modules. |
| Dual independent OE controls | Enables selective activation of either 4-bit group-ideal for split-bus architectures like address/data multiplexing or segmented memory expansion. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory load capacitance. Use Value: 64-mA drive strength supports >100-pF total bus capacitance; fast tPLH/tPHL ≤ 4.6 ns maintains setup/hold timing margins at 20-MHz bus rates. | Use Scenario: Distributing a system clock to multiple peripheral ICs (e.g., ADCs, DACs, UARTs) with matched skew. IC Role / Device Role / Timing Role: Low-skew, high-fanout clock buffer with independent enable per channel group. Use Value: Dual OE allows dynamic clock gating per subsystem; VOLP < 1 V prevents clock-edge jitter induced by ground bounce. |
| Bus Transceiver Interface | Industrial I/O Expansion |
Use Scenario: Bidirectional data transfer between a host MCU and external peripherals via a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Direction-controlled 3-state buffer enabling half-duplex communication without external direction logic. Use Value: Independent 1OE/2OE permits interleaved read/write cycles; tPZL/tPHZ ≤ 6.6 ns minimizes bus turnaround latency. | Use Scenario: Extending GPIO count of a PLC controller to drive relays, sensors, or indicator LEDs in factory automation. IC Role / Device Role / Timing Role: Robust level-shifting and current-boosting interface between low-power MCU pins and industrial 5-V loads. Use Value: −32-mA/64-mA drive handles relay coils (≤50 mA) directly; −40°C to +85°C rating ensures operation in unconditioned control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 24-mA drive, CMOS process, 3.3-V only. | Not suitable for 5-V legacy systems; requires level translation when interfacing with 5-V peripherals. | Select when migrating to 3.3-V designs with lower power budgets and no 5-V compatibility requirement. |
| SN74AHCT244PW | Same 5-V operation, TTL-compatible inputs, but lower drive (−8-mA/8-mA), slower (tPD ≈ 8 ns). | Insufficient for high-capacitance or high-speed buses; limited to low-frequency control signaling. | Choose only for cost-sensitive, low-speed applications where drive strength and speed are non-critical. |
Compared with SN74LVC244APWR and SN74AHCT244PW, the SN74ABT244APWR uniquely delivers 5-V compatibility, 64-mA drive, and sub-5-ns propagation delay-making it the only option among the three qualified for demanding industrial bus-buffering tasks without external support circuitry.
Availability
SN74ABT244APWR is available at Aetrix Electronics and suitable for industrial control systems, embedded networking equipment, and test instrumentation requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT244APWR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The ABT logic family-including SN74ABT244APWR-is engineered for high-speed, high-drive 5-V digital interfaces in noise-immune industrial environments, emphasizing latch-up resilience, ESD robustness, and precise timing control.
FAQ
What is the maximum operating voltage for SN74ABT244APWR?
The absolute maximum supply voltage for SN74ABT244APWR is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per TI's datasheet SCBS099J. Operation outside this range may cause parametric shift or reliability degradation. The SN74ABT244APWR is not rated for 3.3-V operation and will not function correctly below 4.5 V.
Does SN74ABT244APWR support hot-swap or live-insertion?
No, SN74ABT244APWR does not support hot-swap. Its absolute maximum ratings specify that VCC must be applied before any input or output signals, and the device lacks built-in power sequencing or Ioff protection. Applying inputs before VCC risks latch-up or damage. For hot-swap applications, consider TI's TVS-protected or powered-off-isolation logic families instead of SN74ABT244APWR.
Can SN74ABT244APWR drive a 150-pF bus capacitance reliably?
Yes, SN74ABT244APWR can drive up to ~120 pF while maintaining tPLH/tPHL ≤ 4.6 ns (CL = 50 pF specified); at 150 pF, propagation delay increases to ~7–8 ns and edge rate degrades, but functionality remains intact due to its 64-mA IOL. For guaranteed timing at 150 pF, verify with board-level simulation and measure VOLP/VOH margins-SN74ABT244APWR remains viable if timing slack permits.
What is the correct power-up sequence for SN74ABT244APWR?
TI specifies that OE inputs must be held high (disabled) during power-up to prevent bus contention. Tie 1OE and 2OE to VCC through ≥10-kΩ pull-up resistors. Apply VCC before any A-input signals, and ensure GND is established first. This sequence guarantees all outputs start in high-impedance state-critical for safe initialization in multi-driver bus systems using SN74ABT244APWR.
Is SN74ABT244APWR pin-compatible with SN74ABT244ADBR or SN74ABT244ADWR?
Yes, SN74ABT244APWR shares identical pinout and logic function with SN74ABT244ADBR (SSOP-20) and SN74ABT244ADWR (SOIC-20), as confirmed by TI's packaging addendum and logic diagrams. All three use the same 20-pin assignment: dual OE, eight inputs, eight outputs, VCC, and GND in identical positions. Mechanical footprint differs, but schematic symbol and netlist mapping are interchangeable.
SN74ABT244APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74ABT244APWR FAQ
1.How can I place an order for SN74ABT244APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244APWR 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 SN74ABT244APWR reliable?
The price and inventory of SN74ABT244APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244APWR is usually 5 days.
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4.How is shipping managed for SN74ABT244APWR?
SN74ABT244APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT244APWR 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 SN74ABT244APWR?
For technical support, including SN74ABT244APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244APWR requirements.
6.How does Aetrix verify that SN74ABT244APWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT244APWR 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 SN74ABT244APWR meets industry standards.
7.What is the process for return or replacement of SN74ABT244APWR?
All SN74ABT244APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244APWR, 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 SN74ABT244APWR part is unused and in its original packaging.
Return procedure for SN74ABT244APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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