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Texas Instruments SN74ABT2240ADBR
- Part No.:
- SN74ABT2240ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT2240ADBR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,218
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Product details
Overview
SN74ABT2240ADBR from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features two independent 4-bit sections with separate 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 SN74ABT2240ADBR datasheet, SN74ABT2240ADBR pinout, SN74ABT2240ADBR application, or SN74ABT2240ADBR equivalent, this device serves as a high-density, low-ground-bounce solution for 5-V TTL-compatible bus driving, clock distribution, and 3-state memory interface circuits where controlled edge rates and reduced signal integrity issues are critical.
Technical Context
This device implements dual 4-bit noninverting buffers with symmetrical active-low OE control per section. Each output incorporates an integrated 25-Ω series resistor to suppress overshoot/undershoot without external termination. The EPIC-IIB BiCMOS process enables low power dissipation while maintaining TTL-level input thresholds and 5-V CMOS-compatible output swing.
It supports high fan-out (≥64 LSTTL loads) and exhibits typical output ground bounce (VOLP) < 1 V at VCC = 5 V, TA = 25°C. Latch-up immunity exceeds 500 mA per JESD17, and ESD protection meets >2000 V HBM and >200 V machine model standards.
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 mixed-voltage system rails. |
| Output Drive | ±12 mA - Sinks 12 mA / sources 24 mA (IOH = –24 mA), enabling direct interfacing with multiple LSTTL loads. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns @ VCC = 5 V - Supports high-speed bus operation up to ~200 MHz clock domains. |
| 3-State Enable Time | tPZL/tPHZ ≤ 6.8 ns - Enables fast bus arbitration and multiplexing in shared-data-path systems. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic levels for seamless integration into legacy 5-V systems. |
| Output Series Resistance | 25 Ω (integrated) - Eliminates need for external series termination resistors on PCB traces. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and computing applications. |
Pinout & Package
SN74ABT2240ADBR is housed in a 20-pin Shrink Small-Outline Package (SSOP, DB), 7.5 mm × 5.6 mm, 0.65 mm pitch, 2.0 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enable for each 4-bit section; must be pulled high via resistor during power-up to ensure high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | Two groups of four inputs feeding respective output banks; TTL-compatible voltage thresholds. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting buffered outputs | Each includes 25-Ω series resistance; sinks 12 mA, sources 24 mA; high-Z when OE = high. |
| VCC, GND | Power supply and reference | Single 5-V supply rail; decoupling required near package for noise suppression and ground bounce mitigation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates external termination components, reduces PCB area, and minimizes signal reflections on transmission lines. |
| Low output ground bounce (VOLP < 1 V) | Prevents false switching in adjacent logic due to simultaneous output switching noise in dense bus environments. |
| High latch-up immunity (>500 mA) | Ensures robust operation under transient overvoltage or ESD stress per JESD17, critical for industrial reliability. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power, achieving 30 mA max ICC (outputs low) at 5.5 V. |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V allows direct connection to legacy 5-V TTL and LVTTL logic without level-shifting. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices sharing a common address bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing isolation and fan-out expansion between controller and memory array. Use Value: Integrated 25-Ω resistors reduce ringing on long PCB traces; fast enable/disable (<6.8 ns) supports dynamic bus contention management. |
Use Scenario: Bidirectional data bus isolation between CPU and peripheral ICs using external direction control. IC Role / Device Role / Timing Role: Dual-section 3-state driver enabling time-multiplexed data flow on shared 8-bit data paths. Use Value: Independent OE pins allow precise timing control of each 4-bit segment, minimizing bus turnaround delay in multi-master systems. |
| Clock Distribution Network | Legacy System Bus Driver |
|
Use Scenario: Distributing a system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew, noninverting buffer replicating and strengthening clock signals across parallel loads. Use Value: Sub-5 ns propagation delay and <1 V VOLP ensure clean, jitter-minimized clock edges even under heavy capacitive loading. |
Use Scenario: Interfacing modern microcontrollers with legacy ISA or PC/104 peripheral cards requiring 5-V TTL bus compliance. IC Role / Device Role / Timing Role: Level-translation and drive-strengthening buffer for unidirectional control/address signals. Use Value: TTL-compatible VIH/VIL and ±12 mA drive meet original ISA specification requirements without additional logic. |
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 |
|---|---|---|---|
| SN74ABT2244ADBR | Inverting output polarity per channel; otherwise identical pinout, specs, and DB package. | Required where signal inversion is needed in address/data path (e.g., complemented enable logic). | Select SN74ABT2244ADBR only when functional inversion is explicitly required-no change to layout or power design. |
| SN74LVC244APWR | 3.3-V only operation (1.65–3.6 V); lower drive (±24 mA), no integrated series resistors, different pinout. | Suitable for 3.3-V LVTTL systems but requires external termination and level-shifting for 5-V interfaces. | Choose SN74LVC244APWR only in new 3.3-V designs; not drop-in compatible with SN74ABT2240ADBR due to voltage and termination differences. |
Compared with SN74ABT2240ADBR, SN74ABT2244ADBR offers identical timing, drive, and packaging with inverted logic-ideal for polarity-matched redesigns-while SN74LVC244APWR targets lower-voltage systems but sacrifices integrated termination and 5-V compatibility, demanding board-level redesign.
Availability
SN74ABT2240ADBR is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and 5-V memory subsystems requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT2240ADBR 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 5-V logic families.
The SN74ABT2240ADBR belongs to TI's ABT-series advanced bi-directional TTL-compatible logic line, engineered for high-speed, low-noise 5-V bus interfacing in industrial and computing infrastructure.
FAQ
What is the maximum operating supply voltage for SN74ABT2240ADBR?
The absolute maximum supply voltage for SN74ABT2240ADBR is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per the datasheet. Operation outside this range may cause parametric degradation or reliability risk. SN74ABT2240ADBR is not rated for sustained use above 5.5 V in production systems.
Does SN74ABT2240ADBR require external pull-up resistors on its OE pins?
Yes - to ensure outputs remain in high-impedance during power-up or power-down, OE pins must be tied to VCC through an external pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; TI recommends verifying against the driver's IOH spec. This requirement applies directly to SN74ABT2240ADBR's safe startup behavior.
Can SN74ABT2240ADBR drive a 50-pF load with guaranteed timing?
Yes - all switching characteristics (tPLH, tPHL, tPZL, etc.) in the SN74ABT2240ADBR datasheet are specified with CL = 50 pF, including test conditions and waveform definitions. Performance remains within published min/max limits at 5 V supply and 25°C ambient, making SN74ABT2240ADBR suitable for standard PCB trace and IC input loading scenarios.
Is SN74ABT2240ADBR pin-compatible with other ABT-series octal buffers?
SN74ABT2240ADBR shares the same 20-pin DB package footprint and pinout with SN74ABT2244ADBR (inverting version), enabling mechanical interchangeability. However, it is not pin-compatible with SN74ABT240 or SN74ABT244 due to differing pin assignments for OE and I/O grouping - always verify against the specific logic diagram before substitution.
What thermal derating applies to SN74ABT2240ADBR in SSOP (DB) package?
The DB package has a θJA of 115°C/W. At maximum recommended ambient temperature (85°C) and worst-case ICC (30 mA at 5.5 V), power dissipation reaches ~165 mW, resulting in junction temperature rise of ~19°C - well within the 150°C absolute max. Derating is unnecessary below 100 mW total dissipation in still-air conditions for SN74ABT2240ADBR.
SN74ABT2240ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ABT2240ADBR FAQ
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5.How can I obtain technical support or documentation for SN74ABT2240ADBR?
For technical support, including SN74ABT2240ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2240ADBR requirements.
6.How does Aetrix verify that SN74ABT2240ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2240ADBR 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 SN74ABT2240ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT2240ADBR?
All SN74ABT2240ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2240ADBR, 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 SN74ABT2240ADBR part is unused and in its original packaging.
Return procedure for SN74ABT2240ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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