My Inquiry
My Account
Texas Instruments SN74ABT244N
- Part No.:
- SN74ABT244N
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT244N.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,668
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT244N from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory address and bus-oriented applications. It features high-drive capability (–32 mA IOH, 64 mA IOL), low output ground bounce (<1 V VOLP), and operates over –40°C to 85°C at 4.5–5.5 V supply. Used in 3-state bus driving, clock distribution, and address buffering.
For engineers reviewing the SN74ABT244N datasheet, SN74ABT244N pinout, SN74ABT244N application, or SN74ABT244N equivalent, key selection criteria include 3-state output control timing (tPZH ≤ 5.1 ns), high-current drive strength, BiCMOS power efficiency, and DIP-20 package compatibility with legacy through-hole layouts.
Technical Context
The SN74ABT244N implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its EPIC-IIB BiCMOS process enables fast switching (tPLH/tPHL ≤ 4.6 ns @ 5 V, CL = 50 pF) while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V).
It supports hot-insertion-safe operation via high-impedance state control during power sequencing-OE must be pulled up to VCC to ensure defined outputs at power-up. Output clamp current (–50 mA) and latch-up immunity (>500 mA per JESD-17) support robust industrial interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 4.6 ns @ 5 V - enables reliable operation in high-speed address/data buses up to ~200 MHz. |
| 3-State Enable Time | tPZH ≤ 5.1 ns - allows rapid bus arbitration and multiplexing in shared-resource systems. |
| Input Clamp Current | –18 mA - protects against transient overvoltage on unused or floating inputs when clamped. |
| Operating Temperature | –40°C to +85°C - certified for commercial/industrial environments including factory automation and instrumentation. |
| Package Type | 20-pin plastic DIP (N package) - supports through-hole prototyping, legacy board repair, and socket-based test fixtures. |
Pinout & Package
SN74ABT244N uses a 20-pin dual in-line package (DIP) with 0.3-inch body width and standard 0.1-inch pin pitch. Pin numbering follows JEDEC MS-001, with GND at pin 10 and VCC at pin 20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls 4-bit group; low = enabled pass-through, high = high-Z - enables independent bus segment control. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective buffer groups - accepts standard TTL/CMOS logic levels. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Drive external bus lines; high-Z when OE high - prevents contention in multi-driver systems. |
| 10 (GND) | Ground reference | Primary signal return path - must be low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Power supply | +5 V supply rail - requires local 0.1 µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. pure bipolar while retaining high drive - critical for dense bus driver arrays. |
| High-impedance state control | Guaranteed high-Z on power-up when OE tied to VCC via pullup - eliminates bus contention during reset. |
| Output ground bounce (VOLP) | <1 V @ 5 V, 25°C - minimizes noise coupling into sensitive analog sections sharing same PCB ground plane. |
| Latch-up immunity | >500 mA per JESD-17 - withstands ESD and transient overcurrent events in industrial environments. |
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - interoperates directly with legacy 5-V microcontrollers, FPGAs, and ASICs. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver 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: Noninverting 3-state buffer providing fanout and isolation between controller and memory devices. Use Value: High drive strength (64 mA IOL) ensures clean signal edges across long traces; tPZH ≤ 5.1 ns enables tight timing margins in 100+ ns access cycles. |
Use Scenario: Isolating PLC I/O modules from a central backplane bus operating under noisy factory conditions. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling controlled data flow between master and slave nodes using OE-gated segments. Use Value: Latch-up immunity >500 mA and ±18 mA input clamp current protect against field-induced transients and miswiring. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
|
Use Scenario: Distributing a 25-MHz system clock to multiple logic analyzers, FPGA configuration circuits, and peripheral controllers. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with 3-state disable for selective clock gating. Use Value: Propagation delay variation <0.5 ns between channels maintains clock phase alignment; VOLP <1 V prevents jitter injection. |
Use Scenario: Conditioning digital stimulus signals from ATE pattern generators before applying to DUTs with varying input capacitance. IC Role / Device Role / Timing Role: Impedance-matched line driver ensuring signal integrity across mixed-load test fixtures. Use Value: 64 mA IOL drives 50-pF+ loads without waveform degradation; BiCMOS design reduces crosstalk vs. bipolar-only alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Lower drive (–15 mA IOH / 24 mA IOL), higher propagation delay (~25 ns), bipolar TTL process. | Suitable only for low-speed (<10 MHz), low-fanout systems; lacks ground-bounce suppression and latch-up immunity. | Select when cost sensitivity outweighs speed/power needs and legacy LS-TTL compatibility is required. |
| SN74LVC244APW | 3.3-V only operation, smaller TSSOP-20 package, lower drive (–24 mA IOH / 24 mA IOL), CMOS input thresholds. | Requires level translation for 5-V systems; unsuitable for direct replacement in existing 5-V DIP layouts. | Choose for new 3.3-V designs where board space and static power are prioritized over legacy footprint compatibility. |
Compared with SN74LS244N and SN74LVC244APW, the SN74ABT244N uniquely balances 5-V TTL compatibility, high drive, fast timing, and robustness in a through-hole package-making it the only drop-in solution for upgrading legacy 244-based systems without PCB redesign.
Availability
SN74ABT244N is available at Aetrix Electronics and suitable for memory subsystems, industrial backplane interfaces, legacy test equipment upgrades, and 5-V embedded control applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT244N 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 solutions for industrial, automotive, and communications markets.
The ABT logic family-including SN74ABT244N-was engineered for high-speed, high-drive 5-V bus interface applications where reliability, noise immunity, and backward compatibility with TTL systems are essential.
FAQ
What is the recommended power supply decoupling for SN74ABT244N?
Each SN74ABT244N requires a 0.1 µF ceramic capacitor placed as close as possible between pins 20 (VCC) and 10 (GND). For boards with multiple SN74ABT244N units, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor per power rail segment to suppress low-frequency ripple and transient droop during simultaneous output switching.
Can SN74ABT244N be used in hot-swap applications?
The SN74ABT244N is not rated for live insertion. Its absolute maximum rating for output voltage in power-off state is –0.5 V to 5.5 V, but no hot-swap protection circuitry is integrated. To use SN74ABT244N in modular systems, external series resistors and TVS diodes on all Y outputs are required to limit inrush current and clamp transients during insertion.
Does SN74ABT244N support mixed-voltage interfacing with 3.3-V logic?
No. The SN74ABT244N is strictly a 5-V device with TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and 5-V output swing. Direct connection to 3.3-V logic risks overvoltage damage to receiving inputs. A level-shifting buffer such as SN74AVC4T245 must be used between SN74ABT244N outputs and 3.3-V receivers.
How does the SN74ABT244N handle floating inputs?
Unused inputs on the SN74ABT244N must be terminated-either tied to VCC or GND-to prevent metastability and excessive ICC. Floating OE inputs risk undefined output states; floating A inputs increase dynamic power and may cause oscillation. TI specifies that all unused inputs must be held high or low per Note 3 in the datasheet.
What is the thermal derating behavior of SN74ABT244N in the N-package?
The SN74ABT244N in the plastic DIP (N) package has a maximum power dissipation of 1.3 W at TA = 55°C. Above 55°C, power must be linearly derated at 11.7 mW/°C. At 85°C ambient, maximum allowable power drops to 0.94 W. Adequate airflow or heatsinking is required for sustained high-output-current operation near temperature limits.
SN74ABT244N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ABT244N FAQ
1.How can I place an order for SN74ABT244N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244N 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 SN74ABT244N reliable?
The price and inventory of SN74ABT244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244N is usually 5 days.
3.What payment methods are accepted for SN74ABT244N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT244N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT244N?
SN74ABT244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT244N 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 SN74ABT244N?
For technical support, including SN74ABT244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244N requirements.
6.How does Aetrix verify that SN74ABT244N is sourced from the original manufacturer or authorized distributors?
All SN74ABT244N 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 SN74ABT244N meets industry standards.
7.What is the process for return or replacement of SN74ABT244N?
All SN74ABT244N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244N, 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 SN74ABT244N part is unused and in its original packaging.
Return procedure for SN74ABT244N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT244N 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…
