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Texas Instruments SN74ABT2240N
- Part No.:
- SN74ABT2240N
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT2240N.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
- Quantity:
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Inventory:4,060
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Product details
Overview
SN74ABT2240N from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in 5-V systems. It features dual 4-bit sections with independent active-low output-enable (OE) inputs, 25-Ω integrated series output resistors, ±12 mA output drive capability, and operation across –40°C to 85°C.
For engineers reviewing the SN74ABT2240N datasheet, SN74ABT2240N pinout, SN74ABT2240N application, or SN74ABT2240N equivalent, this page delivers verified electrical specs, package mapping to PDIP-20, real-world timing behavior (tPLH/tPHL ≤ 4.8 ns), thermal performance (θJA = 67°C/W), and validated drop-in alternatives for bus interface design.
Technical Context
This device implements two independent 4-bit noninverting buffers, each with dedicated OE control. Outputs enter high-impedance state when OE is high; data passes inverted from A to Y when OE is low - confirmed by function table and logic diagram. The EPIC-IIB BiCMOS process enables TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) while delivering rail-to-rail output swing under load.
Each output integrates a 25-Ω series resistor to suppress overshoot/undershoot without external components. Output drive is asymmetric: IOL = 12 mA (sink), IOH = –24 mA (source at VCC = 5 V), supporting mixed-logic loading. 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 standard 5-V TTL and CMOS buses. |
| Output Drive (IOL) | 12 mA sink - sufficient to drive multiple TTL loads or terminated transmission lines. |
| Propagation Delay (tPLH/tPHL) | ≤ 4.8 ns at VCC = 5 V, CL = 50 pF - enables high-speed address/data buffering in 25+ MHz bus systems. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - matches standard TTL logic levels for seamless interfacing. |
| Thermal Resistance (θJA) | 67°C/W (PDIP-20) - defines maximum power dissipation before thermal derating in still-air environments. |
| ESD Protection | 2000 V HBM - reduces risk of field failure during handling and board assembly. |
| Latch-Up Immunity | >500 mA per JESD17 - prevents destructive latch-up under transient overvoltage conditions. |
Pinout & Package
SN74ABT2240N uses a 20-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard 0.1"-grid protoboards and wave-solder fixtures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls high-impedance state for respective 4-bit section; must be pulled high via resistor during power-up to avoid bus contention. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for each buffer channel; TTL-compatible voltage thresholds ensure reliable signal capture. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive external loads with integrated 25-Ω series resistance; sink up to 12 mA per pin. |
| 10, 20 | GND, VCC | Power supply pins - require local 0.1 µF ceramic decoupling near VCC/GND pair to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates need for external termination resistors, reducing BOM count and PCB area in high-speed bus designs. |
| EPIC-IIB BiCMOS process | Reduces dynamic power consumption vs. standard bipolar TTL while maintaining speed and drive strength. |
| Asymmetric output drive (12 mA sink / 24 mA source) | Optimizes performance for common bus topologies where sink current dominates (e.g., pull-down dominant loads). |
| Low ground bounce (VOLP < 1 V) | Maintains signal integrity during simultaneous output switching, critical for noise-sensitive mixed-signal systems. |
| High latch-up immunity (>500 mA) | Enables robust operation in industrial environments with EFT and surge transients on shared power rails. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory in embedded control systems. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates CPU from memory during DMA cycles; tPLH ≤ 4.8 ns supports 20+ MHz address setup. Use Value: Integrated 25-Ω resistors prevent ringing on long traces, eliminating need for 16 discrete terminations and saving 32 mm² PCB area. | Use Scenario: Level-shifting and isolation between two 5-V parallel buses sharing a common backplane. IC Role / Device Role / Timing Role: Dual-section 3-state driver enables bidirectional data flow control; independent OE pins allow precise timing of bus turnarounds. Use Value: Asymmetric drive (12 mA sink / 24 mA source) matches typical bus loading asymmetry, improving rise/fall time balance without external biasing. |
| Clock Distribution | Legacy Peripheral Interface |
Use Scenario: Fan-out of system clock to multiple peripherals (UART, SPI, GPIO expanders) in industrial PLC modules. IC Role / Device Role / Timing Role: Low-skew buffer with matched propagation delays ensures synchronous edge delivery; VOLP < 1 V minimizes jitter injection. Use Value: High fan-out capability (≥10 TTL loads per output) eliminates need for cascaded buffers, reducing latency and component count. | Use Scenario: Interfacing legacy ISA-bus peripherals (e.g., parallel port controllers) to modern microcontrollers in test equipment. IC Role / Device Role / Timing Role: Voltage- and timing-compatible buffer provides level translation and drive strength matching for 5-V TTL signaling standards. Use Value: TTL-input thresholds and rail-to-rail outputs ensure interoperability with decades-old peripheral ICs without level-shifters or pull-ups. |
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 |
|---|---|---|---|
| SN74ABT2244N | Inverting outputs (vs. noninverting in SN74ABT2240N); identical pinout, timing, and drive specs. | Required where logic inversion is needed in the signal path (e.g., active-low enable propagation). | Select SN74ABT2244N only when inversion is functionally required; otherwise SN74ABT2240N avoids extra inverters in BOM. |
| SN74ACT240N | CMOS process (vs. BiCMOS); lower ICC (250 µA vs. 30 mA active), but slower tPLH/tPHL (≤ 9 ns) and no integrated 25-Ω resistors. | Suitable for low-power, lower-speed systems where board space allows discrete termination. | Choose SN74ACT240N for battery-powered or thermally constrained designs; SN74ABT2240N preferred for speed-critical or layout-constrained bus interfaces. |
Compared with SN74ABT2240N, SN74ABT2244N offers functional inversion without timing or drive trade-offs, while SN74ACT240N trades speed and integrated termination for lower static power - enabling selection based on whether signal polarity, speed, or quiescent current dominates the design priority.
Availability
SN74ABT2240N is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, legacy peripheral adapters, and clock distribution networks requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT2240N 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 over 90 years of innovation in industrial, automotive, and communications markets.
The ABT logic family, including SN74ABT2240N, was engineered for high-speed 5-V bus interface applications requiring low noise, high drive, and robust ESD/latch-up performance in demanding environments.
FAQ
What is the maximum clock frequency supported by SN74ABT2240N in a bus application?
The SN74ABT2240N does not specify a maximum clock frequency directly, but its propagation delay (tPLH/tPHL ≤ 4.8 ns at VCC = 5 V, CL = 50 pF) and enable/disable times (tPZL/tPHZ ≤ 6.8 ns) support reliable operation in 25 MHz address/data buses. System-level timing margins depend on trace length, load capacitance, and slew rate; for 50-pF loads, SN74ABT2240N maintains signal integrity up to ~100 MHz edge rates.
Does SN74ABT2240N require external pull-up resistors on OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, OE pins must be tied to VCC via external pull-up resistors. TI recommends minimum values based on driver sink capability; for SN74ABT2240N, a 10-kΩ resistor is typical. This prevents bus contention before firmware initializes OE control.
Can SN74ABT2240N drive unterminated 50-Ω transmission lines?
No - SN74ABT2240N's integrated 25-Ω series resistors are optimized for driving capacitive loads (e.g., 50 pF) and short stubs, not 50-Ω controlled-impedance lines. For proper termination of 50-Ω lines, use external series or parallel resistors. The internal 25-Ω resistor helps dampen reflections on short, lightly loaded traces but does not match 50-Ω characteristic impedance.
Is SN74ABT2240N RoHS compliant?
Yes - SN74ABT2240N is manufactured in Pb-Free (RoHS-compliant) form, with CU NIPDAU lead finish. Per TI's packaging documentation, it meets EU RoHS Directive 2011/65/EU requirements, containing ≤0.1% lead by weight in homogeneous materials and no restricted brominated flame retardants.
How does the 25-Ω series resistor in SN74ABT2240N affect signal rise/fall times?
The integrated 25-Ω series resistor in SN74ABT2240N increases effective output impedance, which - when combined with load capacitance - forms an RC filter that slightly slows edge rates. For a 50-pF load, this adds ~1.25 ns to rise/fall time. However, this intentional slowing reduces overshoot/undershoot and EMI, making SN74ABT2240N more robust than non-terminated drivers in noisy industrial environments.
SN74ABT2240N 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:
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- Mounting Type:
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- Supplier Device Package:
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SN74ABT2240N FAQ
1.How can I place an order for SN74ABT2240N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2240N 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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5.How can I obtain technical support or documentation for SN74ABT2240N?
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6.How does Aetrix verify that SN74ABT2240N is sourced from the original manufacturer or authorized distributors?
All SN74ABT2240N 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 SN74ABT2240N meets industry standards.
7.What is the process for return or replacement of SN74ABT2240N?
All SN74ABT2240N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2240N, 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 SN74ABT2240N part is unused and in its original packaging.
Return procedure for SN74ABT2240N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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