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Texas Instruments SN74ABT244APWRE4
- Part No.:
- SN74ABT244APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT244APWRE4.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
SN74ABT244APWRE4 from Texas Instruments is a noninverting octal buffer/line driver with two independent 4-bit sections, each featuring separate 3-state output-enable (OE) inputs. It delivers high-drive capability (−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, bus transceivers, and clock distribution systems where signal integrity and drive strength are critical.
For engineers reviewing the SN74ABT244APWRE4 datasheet, SN74ABT244APWRE4 pinout, SN74ABT244APWRE4 application, or SN74ABT244APWRE4 equivalent, this page provides verified electrical specifications, TSSOP-20 package details, functional behavior under OE control, and validated alternative options for bus interface design.
Technical Context
The SN74ABT244APWRE4 implements EPIC-IIB BiCMOS logic architecture to reduce power dissipation while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and fast switching (tPLH/tPHL ≤ 4.6 ns at 5 V, CL = 50 pF). Its dual 4-bit structure enables independent control of two data paths via 1OE and 2OE pins.
Each buffer passes noninverted A-input data to Y-outputs when its OE is low; outputs enter high-impedance state when OE is high. To ensure defined state during power sequencing, OE inputs require external pull-up resistors to VCC - minimum value determined by driver sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS systems without level-shifting. |
| Output Drive | −32 mA IOH / +64 mA IOL - drives heavy capacitive loads (e.g., >100 pF buses) and multiple TTL inputs reliably. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns @ 5 V - enables operation in high-speed address/data paths up to ~100 MHz. |
| 3-State Enable Time | tPZL ≤ 5.7 ns, tPHZ ≤ 6.6 ns - ensures rapid bus release and acquisition for time-critical multiplexing. |
| Input Clamp Current | −18 mA - protects against negative transients during hot-swap or ESD events without external diodes. |
| ESD Rating | >2000 V HBM, >200 V MM - meets industrial system robustness requirements per MIL-STD-883. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments including factory automation and telecom infrastructure. |
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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls 4-bit group independently; low = enabled, high = high-Z - enables bidirectional bus arbitration. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective 4-bit sections - accept standard TTL/CMOS logic levels. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | High-drive, 3-state outputs - directly drive PCB traces, backplanes, or downstream logic without buffers. |
| VCC (Pin 10) | Power supply | 5-V supply rail; decoupling capacitor required within 1 cm for noise suppression. |
| GND (Pin 20) | Ground reference | Common return path for all signals and power - must be low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. pure bipolar while retaining speed and drive - lowers thermal load in dense PCB layouts. |
| High-impedance state control | Guaranteed high-Z on power-up/down when OE tied to VCC via pull-up - prevents bus contention during reset sequences. |
| Latch-up immunity | >500 mA per JEDEC JESD-17 - eliminates risk of destructive latch-up in noisy industrial power domains. |
| Output ground bounce (VOLP) | <1 V @ 5 V, 25°C - maintains signal integrity during simultaneous output switching across all 8 drivers. |
| Input transition rate tolerance | 5 ns/V min - accommodates slow-rising clock or control signals without false triggering. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address lines from microcontroller to SRAM or flash memory in PLC modules. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address bus from memory load; enables fan-out to multiple devices. Use Value: −32 mA/64 mA drive ensures setup/hold timing margins are maintained even with 100 pF trace capacitance and 50 Ω termination. | Use Scenario: Bidirectional data routing between MCU and peripheral ICs (ADC, DAC, sensor hubs) on shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Direction-controlled line driver/receiver enabling half-duplex communication without dedicated direction lines. Use Value: Independent 1OE/2OE pins allow precise timing of bus release (tPZL ≤ 5.7 ns) to prevent data collision during handshaking. |
| Clock Distribution | Backplane Signal Conditioning |
Use Scenario: Distributing a 25-MHz system clock to multiple FPGA configuration interfaces or CPLD JTAG chains. IC Role / Device Role / Timing Role: Low-skew, high-drive clock repeater with matched propagation delays across all 8 outputs. Use Value: tPLH/tPHL matching ≤ 0.3 ns (typ.) minimizes clock skew across endpoints, preserving timing closure in synchronous designs. | Use Scenario: Interfacing 5-V logic between stacked PCBs in modular test equipment using 20-pin ribbon cable backplanes. IC Role / Device Role / Timing Role: Impedance-matched line driver compensating for signal degradation over 15-cm 50-Ω traces. Use Value: VOLP < 1 V and fast edge rates (≤ 4.6 ns) maintain clean logic transitions despite interconnect inductance and crosstalk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V), lower drive (−24/+24 mA), CMOS process | Not suitable for 5-V legacy buses; requires level translation if interfacing with 5-V peripherals | Select when migrating to 3.3-V systems and power efficiency is prioritized over drive strength. |
| SN74ABT244ANSR | SOIC-20 (NS) package, identical electrical specs, same 5-V operation and drive | Same function but larger footprint (7.5 mm × 10.3 mm vs. TSSOP's 6.5 mm × 4.4 mm); higher thermal resistance (θJA = 90°C/W vs. 128°C/W) | Choose for manual assembly or legacy board compatibility where TSSOP reflow is not available. |
Compared with SN74LVC244APWR and SN74ABT244ANSR, the SN74ABT244APWRE4 uniquely balances 5-V bus compatibility, high current drive, and space-constrained TSSOP packaging - making it optimal for industrial controllers requiring robust signal integrity in compact form factors.
Availability
SN74ABT244APWRE4 is available at Aetrix Electronics and suitable for industrial bus transceivers, memory address buffering, clock distribution networks, and backplane signal conditioning requiring stable component supply across long-lifecycle programs.
Supply support for SN74ABT244APWRE4 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 logic solutions for industrial, automotive, and communications markets.
The SN74ABT244A family was engineered for high-speed, high-drive 5-V bus interface applications - targeting memory subsystems, programmable logic interconnect, and real-time control systems demanding reliability under electrical stress.
FAQ
What is the maximum output current rating for SN74ABT244APWRE4?
The SN74ABT244APWRE4 supports −32 mA high-level output current (IOH) and +64 mA low-level output current (IOL) per pin under recommended operating conditions (VCC = 4.5–5.5 V, TA = −40°C to 85°C). These values are specified at VOH ≥ 2 V and VOL ≤ 0.55 V respectively, ensuring reliable driving of multiple TTL loads or moderate PCB trace capacitance without violating logic thresholds.
Does SN74ABT244APWRE4 require external pull-up resistors on OE pins?
Yes, SN74ABT244APWRE4 requires external pull-up resistors on both 1OE and 2OE pins to ensure outputs remain in high-impedance state during power-up and power-down. The minimum resistor value depends on the sink capability of the controlling driver - typically 4.7 kΩ to 10 kΩ is used with 5-V CMOS logic. This prevents bus contention before system initialization completes.
Can SN74ABT244APWRE4 operate at 3.3 V?
No, SN74ABT244APWRE4 is not rated for 3.3-V operation. Its recommended supply voltage range is strictly 4.5 V to 5.5 V, and input thresholds (VIH = 2 V, VIL = 0.8 V) are optimized for 5-V TTL compatibility. Operating below 4.5 V may cause marginal switching, increased propagation delay, or failure to meet output voltage specifications - use SN74LVC244APWR for 3.3-V systems.
What is the thermal resistance (θJA) of the SN74ABT244APWRE4 in its TSSOP-20 package?
The SN74ABT244APWRE4 in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (θJA) of 128°C/W, as specified in the absolute maximum ratings table. This value assumes standard JEDEC test board conditions (2-layer board, 1-in² copper pad). For sustained 64-mA output loading across multiple pins, derating or additional copper pour is recommended to maintain junction temperature below 125°C.
Is SN74ABT244APWRE4 pin-compatible with SN74ABT244ANSR?
Yes, SN74ABT244APWRE4 and SN74ABT244ANSR share identical pin functions and numbering (20-pin dual-in-line layout), but differ in physical package: PW is TSSOP (6.5 mm × 4.4 mm), NS is SOIC (7.5 mm × 10.3 mm). No PCB redesign is needed for functional replacement, though solder paste volume and reflow profile must be adjusted for the finer-pitch TSSOP geometry.
SN74ABT244APWRE4 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:
- 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:
- 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
SN74ABT244APWRE4 FAQ
1.How can I place an order for SN74ABT244APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244APWRE4 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 SN74ABT244APWRE4 reliable?
The price and inventory of SN74ABT244APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74ABT244APWRE4?
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4.How is shipping managed for SN74ABT244APWRE4?
SN74ABT244APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT244APWRE4 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 SN74ABT244APWRE4?
For technical support, including SN74ABT244APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244APWRE4 requirements.
6.How does Aetrix verify that SN74ABT244APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT244APWRE4 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 SN74ABT244APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ABT244APWRE4?
All SN74ABT244APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244APWRE4, 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 SN74ABT244APWRE4 part is unused and in its original packaging.
Return procedure for SN74ABT244APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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