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STMicroelectronics 74ACT280MTR
- Part No.:
- 74ACT280MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Parity Generators and Checkers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74ACT280MTR.pdf
- Description:
- IC PARITY GEN/CHKER 9-BIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,226
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Product details
Overview
74ACT280MTR from STMicroelectronics is a high-speed CMOS 9-bit parity generator/checker with TTL-compatible inputs, 7ns typical propagation delay at 5V, ±24mA symmetrical output drive, and operation across 4.5–5.5V supply. It features ΣODD and ΣEVEN outputs, nine data inputs (A–I), and NC pin, used in error-detection circuits for bus-based computing and memory subsystems.
For engineers reviewing the 74ACT280MTR datasheet, 74ACT280MTR pinout, 74ACT280MTR application, or 74ACT280MTR equivalent, key selection criteria include odd/even parity generation capability, 50Ω transmission line driving, ESD-hardened I/O (2kV), and compatibility with legacy 74-series logic interfaces in industrial control and telecom backplane designs.
Technical Context
The device implements combinational logic to count high-level inputs across nine data lines (A–I) and assert ΣODD or ΣEVEN based on parity state-no internal latching or clocking. Its C2MOS process enables rail-to-rail output swing and low quiescent ICC (4µA max).
All inputs accept TTL voltage thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), and outputs deliver matched |IOH| = |IOL| ≥ 24mA into 50Ω loads, ensuring clean edge integrity on controlled-impedance traces without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - supports standard 5V logic rails with ±10% tolerance |
| tPD (Typ.) | 7ns at VCC = 5V - enables sub-150MHz parity checking in synchronous buses |
| IOL / IOH | ≥24mA - drives 50Ω transmission lines directly without buffer stages |
| VIH / VIL | 2.0V min / 0.8V max - interoperates with TTL, NMOS, and CMOS outputs |
| ICC (Max) | 4µA at TA = 25°C - ultra-low static power for always-on diagnostic logic |
| ESD Rating | 2kV HBM - protects against handling-induced discharge in assembly environments |
| Operating Temp | −55°C to +125°C - qualified for extended industrial and automotive under-hood use |
Pinout & Package
74ACT280MTR is supplied in a 14-pin TSSOP package (JEDEC MO-153, 4.9 × 6.4 mm body, 0.65 mm pitch), optimized for surface-mount PCB assembly and thermal performance in dense logic layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 8–13 | A–I Data Inputs | Nine independent logic inputs determining parity state; TTL/CMOS compatible |
| 5, 6 | ΣEVEN, ΣODD | Complementary parity outputs - only one asserted high per input pattern |
| 3 | NC | No internal connection - must remain unconnected per design |
| 7 | GND | Logic ground reference - requires low-inductance return path for noise immunity |
| 14 | VCC | Positive supply - decoupling capacitor (100nF) required within 5mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Output Drive | |IOH| = |IOL| ≥ 24mA ensures matched rise/fall times on 50Ω lines |
| Balanced Propagation Delays | tPLH ≅ tPHL minimizes skew between ΣODD and ΣEVEN assertion |
| Input Voltage Compatibility | VIH ≥ 2.0V / VIL ≤ 0.8V enables direct interface with 74LS, 74F, and 74HC families |
| Latch-Up Immunity | Enhanced C2MOS process prevents destructive latch-up under transient overvoltage |
Applications
| Memory Subsystem Parity | Industrial Bus Monitoring |
|---|---|
Use Scenario: Detects single-bit errors in 8-bit+ data words transferred between CPU and SRAM/DRAM modules. IC Role / Device Role / Timing Role: Combinational parity generator/checker operating asynchronously with address/data strobes. Use Value: Enables real-time error detection without adding clock latency or pipeline stalls. | Use Scenario: Validates data integrity on Modbus RTU or Profibus DP fieldbus segments. IC Role / Device Role / Timing Role: Standalone parity checker inserted inline between transceiver and controller logic. Use Value: Adds fault detection at physical layer with no firmware overhead or MCU resource usage. |
| Legacy System Emulation | Test Equipment Signal Validation |
Use Scenario: Replaces obsolete 74S280 in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement with improved speed and ESD robustness. Use Value: Restores functionality while extending reliability in aging test fixtures and lab equipment. | Use Scenario: Verifies correct parity generation in automated boundary-scan or functional test systems. IC Role / Device Role / Timing Role: Reference parity generator used to validate DUT output against golden pattern. Use Value: Provides deterministic, jitter-free parity reference for high-accuracy test correlation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit parity generation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT280M | SOP-14 package; identical electrical specs and pinout | Preferred for through-hole prototyping or wave-soldered legacy boards | Select when board layout or assembly process requires SOIC footprint |
| SN74ACT280N | DIP-14 package; same AC/DC characteristics but higher parasitic inductance | Suitable for breadboard evaluation or low-frequency (<10MHz) parity verification | Choose for manual testing or educational labs where TSSOP rework is impractical |
Compared with 74ACT280M and SN74ACT280N, the 74ACT280MTR offers superior high-frequency signal integrity via TSSOP's lower lead inductance and tighter trace routing-critical for >25MHz bus operation and EMI-sensitive environments.
Availability
74ACT280MTR is available at Aetrix Electronics and suitable for memory subsystem parity, industrial bus monitoring, legacy system emulation, and test equipment signal validation requiring stable component supply and long-term lifecycle support.
Supply support for 74ACT280MTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The 74ACT family targets high-speed, low-power TTL-compatible logic applications-specifically engineered for seamless integration into legacy and hybrid digital systems requiring robust noise immunity and wide temperature operation.
FAQ
Is 74ACT280MTR pin-compatible with older 74LS280 devices?
Yes-74ACT280MTR maintains identical pinout and logic function with 74LS280, including A–I inputs, ΣODD/ΣEVEN outputs, GND, VCC, and NC pin. However, it operates at higher speed (7ns vs. ~25ns), draws far less quiescent current (4µA vs. ~20mA), and requires 4.5–5.5V supply instead of 4.75–5.25V.
Can 74ACT280MTR be cascaded for longer word lengths?
Yes-the device supports word-length expansion by connecting ΣODD or ΣEVEN outputs to additional 74ACT280 inputs. The truth table and symmetrical drive ensure predictable parity chaining across multiple ICs without added logic gates or timing uncertainty.
What is the significance of the NC pin (Pin 3)?
Pin 3 is internally unconnected and must remain floating-no pull-up, pull-down, or trace routing. Connecting it risks unintended current paths or noise coupling. This NC designation is confirmed in ST's official mechanical drawings and logic symbol diagrams for all 74ACT280 variants.
Does 74ACT280MTR require external decoupling capacitors?
Yes-a 100nF ceramic capacitor must be placed between VCC (Pin 14) and GND (Pin 7) within 5mm of the package. This suppresses supply transients caused by simultaneous switching of nine inputs and dual outputs, preventing false parity assertions or ground bounce in high-density layouts.
74ACT280MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Parity Generator/Checker
- Number of Circuits:
- 9-Bit
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74ACT280MTR FAQ
1.How can I place an order for 74ACT280MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT280MTR 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 74ACT280MTR reliable?
The price and inventory of 74ACT280MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT280MTR is usually 5 days.
3.What payment methods are accepted for 74ACT280MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT280MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT280MTR?
74ACT280MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT280MTR 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 74ACT280MTR?
For technical support, including 74ACT280MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT280MTR requirements.
6.How does Aetrix verify that 74ACT280MTR is sourced from the original manufacturer or authorized distributors?
All 74ACT280MTR 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 74ACT280MTR meets industry standards.
7.What is the process for return or replacement of 74ACT280MTR?
All 74ACT280MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT280MTR, 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 74ACT280MTR part is unused and in its original packaging.
Return procedure for 74ACT280MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74ACT280MTR Tags
-
74HCT280D,653
Nexperia USA Inc.
-
M74HC280YRM13TR
STMicroelectronics
-
SN74F280BNSR
Texas Instruments
-
SN74AS280N
Texas Instruments
-
SN74F280BDR
Texas Instruments
-
SN74F280BN
Texas Instruments
-
74HC280D,653
Nexperia USA Inc.
-
74HCT280PWJ
Nexperia USA Inc.
-
SN74LS280N
Texas Instruments
-
SN74LS280M
onsemi
-
MC74F280D
onsemi
-
MC74F280DR2
onsemi
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