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Texas Instruments SN74ABT2240AN
- Part No.:
- SN74ABT2240AN
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT2240AN.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:798
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Product details
Overview
SN74ABT2240AN from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features dual 4-bit channels, symmetrical active-low output-enable (OE) inputs, 25-Ω integrated series output resistors, ±12 mA output drive capability, and operates over –40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABT2240AN datasheet, SN74ABT2240AN pinout, SN74ABT2240AN application, or SN74ABT2240AN equivalent, this device serves as a high-density, low-ground-bounce solution for 3-state bus driving, clock distribution, and address buffering in industrial and embedded systems where signal integrity and fan-out are critical.
Technical Context
This device implements two independent 4-bit inverting buffers, each with dedicated OE control. Each output includes on-die 25-Ω series resistance to suppress overshoot/undershoot without external termination. The EPIC-IIB BiCMOS process enables TTL-compatible input thresholds, low propagation delay (tPLH/tPHL ≤ 4.8 ns), and reduced power dissipation versus standard bipolar TTL.
It supports hot-insertion-safe operation via high-impedance state during power-up/down when OE is pulled up to VCC. Latch-up immunity exceeds 500 mA per JESD17, and ESD protection meets 2000 V (HBM) and 200 V (machine model).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage logic systems. |
| Output Drive | ±12 mA - Sinks 12 mA / sources 24 mA (IOH = –24 mA), enabling direct interface with multiple TTL loads. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns @ 5 V, 25°C - Supports high-speed bus timing in memory and peripheral interfaces. |
| Output Impedance | 25 Ω series resistor - Eliminates need for external series termination, reducing BOM count and PCB area. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and control applications. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Matches standard TTL logic levels for seamless interoperability. |
| Ground Bounce | VOLP < 1 V @ 5 V - Minimizes noise coupling into shared ground planes during simultaneous switching. |
Pinout & Package
SN74ABT2240AN uses a 20-pin plastic dual in-line package (PDIP-N), 0.300-inch body width, with standard through-hole mounting and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit channel; drives outputs to high-Z when high. |
| 1A1–1A4, 2A1–2A4 | Inverting data inputs | Eight total inputs; each inverted and routed to corresponding Y output when OE is low. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Eight buffered, inverted outputs with built-in 25-Ω series resistance for clean edge control. |
| GND (Pin 10), VCC (Pin 20) | Power terminals | Single-supply operation; decoupling capacitor placement near Pin 20 is critical for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates external termination components, reduces layout complexity, and improves signal integrity on stubbed buses. |
| EPIC-IIB BiCMOS process | Combines bipolar speed with CMOS low static power, achieving <1 mA ICC in disabled state and <30 mA max active current. |
| Symmetrical active-low OE inputs | Enables predictable, glitch-free bus arbitration and allows simple pull-up resistor biasing for power-up safety. |
| High fan-out capability | Drives ≥10 standard TTL loads per output, supporting dense memory address and data bus expansion. |
| Robust ESD and latch-up immunity | 2000 V HBM ESD rating and >500 mA latch-up current ensure reliability in manufacturing and field environments. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 20-bit address lines from a microcontroller to SRAM or flash memory arrays. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level-shifted, slew-controlled address signals with hot-swap safe disable. Use Value: Prevents address bus contention during reset or multi-master arbitration using independent OE controls and fast tPZL ≤ 6.8 ns. |
Use Scenario: Bidirectional data bus isolation between FPGA and legacy parallel peripherals (e.g., LCD controllers, ADCs). IC Role / Device Role / Timing Role: Octal inverting driver enabling direction-controlled data flow with matched rise/fall times and minimal ground bounce. Use Value: Integrated 25-Ω resistors suppress reflections on 50-cm ribbon cables, eliminating need for discrete termination networks. |
| Clock Distribution Network | Industrial I/O Expansion |
|
Use Scenario: Fan-out of a system clock to multiple synchronous logic blocks (e.g., CPLDs, counters, timers). IC Role / Device Role / Timing Role: Low-skew inverting buffer delivering synchronized, edge-cleaned clock edges to eight destinations. Use Value: Propagation delay matching (tPLH/tPHL variation <1.5 ns) ensures setup/hold margin across all outputs. |
Use Scenario: Interfacing PLC CPU modules with 24-V digital input cards requiring 5-V logic level translation and transient suppression. IC Role / Device Role / Timing Role: Robust 3-state buffer isolating field-side transients while driving optocoupler inputs with controlled edge rates. Use Value: High IOL = 12 mA sustains LED forward current in opto-isolators; latch-up immunity prevents failure during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT2240ADWR | Same logic function and specs, but in SOIC (DW) surface-mount package (20-pin, 0.300" width). | Requires rework of PCB layout for SMT assembly; no through-hole compatibility. | Select for automated production, space-constrained boards, or thermal performance improvement (θJA = 97°C/W vs. N-package's 67°C/W). |
| SN74ABT2240APW | Identical functionality in TSSOP (PW) package (20-pin, 4.4 mm width), thinner profile (1.2 mm max height). | Not pin-compatible with PDIP due to different lead pitch (0.65 mm vs. 2.54 mm); requires new footprint and stencil. | Choose for ultra-thin designs, portable equipment, or where board thickness is constrained below 2.5 mm. |
Compared with SN74ABT2240AN, the SOIC and TSSOP variants offer superior thermal metrics and automation compatibility but demand full PCB redesign-whereas SN74ABT2240AN remains optimal for prototyping, repair, and legacy through-hole systems requiring zero layout change.
Availability
SN74ABT2240AN is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation upgrades, and embedded memory subsystems requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT2240AN 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 logic solutions, with decades of heritage in high-reliability logic families.
The SN74ABT2240AN belongs to TI's ABT-series advanced bi-directional TTL-compatible logic line, engineered for high-speed, low-noise bus interfacing in industrial, computing, and communications infrastructure.
FAQ
What is the maximum output sink current for SN74ABT2240AN?
The SN74ABT2240AN guarantees a minimum output sink current (IOL) of 12 mA per output at VCC = 4.5 V and VOL = 0.8 V. This rating ensures reliable drive of multiple TTL inputs or optocoupler LEDs without external amplification. The SN74ABT2240AN maintains this performance across its full operating temperature range (–40°C to +85°C).
Does SN74ABT2240AN require external series resistors on its outputs?
No. The SN74ABT2240AN integrates 25-Ω series resistors on all eight outputs, explicitly designed to suppress overshoot and undershoot in transmission-line environments. This eliminates the need for external termination resistors, simplifying PCB layout and reducing bill-of-materials cost. The SN74ABT2240AN's internal resistance is factory-trimmed and process-stable.
How should OE pins be handled during power-up to avoid bus contention with SN74ABT2240AN?
To ensure high-impedance state at power-up, both 1OE and 2OE pins must be tied to VCC via pull-up resistors. TI recommends a minimum resistor value determined by the driver's current-sinking capability-typically 4.7 kΩ suffices. This prevents unintended output activation before system initialization completes. The SN74ABT2240AN's design inherently supports this safe power sequencing.
What is the propagation delay variation between channels in SN74ABT2240AN?
Within a single SN74ABT2240AN device, propagation delay matching between any two outputs is tightly controlled: tPLH and tPHL exhibit ≤1.5 ns typical skew at VCC = 5 V and TA = 25°C. This low skew enables synchronous fan-out in clock and address distribution applications. The SN74ABT2240AN datasheet specifies worst-case skew under recommended operating conditions.
Is SN74ABT2240AN compatible with 3.3-V input logic levels?
No. The SN74ABT2240AN has TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and is specified only for 4.5–5.5 V operation. It is not 3.3-V tolerant-applying 3.3-V logic signals may result in marginal or non-functional switching. For mixed-voltage systems, level-shifting circuitry or a 3.3-V-compatible alternative (e.g., SN74LVC244A) is required alongside the SN74ABT2240AN.
SN74ABT2240AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT2240AN FAQ
1.How can I place an order for SN74ABT2240AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2240AN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABT2240AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2240AN is usually 5 days.
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Once your SN74ABT2240AN 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 SN74ABT2240AN?
For technical support, including SN74ABT2240AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2240AN requirements.
6.How does Aetrix verify that SN74ABT2240AN is sourced from the original manufacturer or authorized distributors?
All SN74ABT2240AN 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 SN74ABT2240AN meets industry standards.
7.What is the process for return or replacement of SN74ABT2240AN?
All SN74ABT2240AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2240AN, 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 SN74ABT2240AN part is unused and in its original packaging.
Return procedure for SN74ABT2240AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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