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onsemi 74ACTQ240PC
- Part No.:
- 74ACTQ240PC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74ACTQ240PC.pdf
- Description:
- IC BUFF INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,238
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Product details
Overview
74ACTQ240PC from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for memory address driving and bus-oriented transmission in 5V TTL-compatible systems. It delivers ±24mA output drive, guarantees <1.0ns output-to-output skew at 5V, and operates across –40°C to +85°C with supply voltage 4.5V–5.5V.
For engineers reviewing the 74ACTQ240PC datasheet, pinout, applications, or equivalent options, key selection criteria include simultaneous switching noise immunity, dynamic input threshold stability (VIHD ≥ 2.2V / VILD ≤ 0.8V at 5V), quiet output voltage swing (VOLP ≤ 1.5V, VOLV ≥ –1.2V), and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74ACTQ240PC implements Fairchild's FACT Quiet Series™ architecture with GTO™ output control and undershoot correction, using a split ground bus to suppress simultaneous switching noise. Its dual 3-STATE enable inputs (OE1, OE2) independently control two groups of four outputs each, enabling selective bus isolation.
It features guaranteed AC performance including tPHL/tPLH ≤ 7.5ns (5V, CL = 50pF), tPZL/tPZH ≤ 9.0ns, and tPHZ/tPLZ ≤ 10.0ns - all validated under worst-case temperature and voltage conditions. Dynamic thresholds (VIHD/VILD) are specified per actual switching behavior, not static DC levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - ensures robust operation in standard 5V TTL/CMOS mixed-signal environments without derating. |
| Output Drive | ±24mA - supports direct interfacing with heavy capacitive loads (e.g., >100pF buses) without external buffering. |
| Propagation Delay | tPHL/tPLH ≤ 7.5ns @ 5V - enables reliable timing in high-speed address/data paths up to ~100MHz system clock domains. |
| Output Skew | tOSHL/tOSLH ≤ 1.0ns @ 5V - guarantees deterministic parallel data alignment critical for synchronous bus arbitration. |
| Dynamic Thresholds | VIHD ≥ 2.2V, VILD ≤ 0.8V @ 5V - provides noise margin against crosstalk and ground bounce during fast edge transitions. |
| Quiet Output Swing | VOLP ≤ 1.5V, VOLV ≥ –1.2V - limits transient undershoot/overshoot to prevent false triggering in adjacent logic stages. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications. |
Pinout & Package
74ACTQ240PC is packaged in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (Package Number M20B), with standard 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 6, 7, 8, 9 | I0–I7 (Inputs) | Inverting data inputs - each drives one corresponding output; logic HIGH yields LOW output when enabled. |
| 3, 5, 7, 9 | OE2 (3-STATE Enable) | Active-LOW enable for outputs O0–O3 - asserts high-impedance state when HIGH; shared with pins 3/5/7/9 per truth table grouping. |
| 12, 14, 16, 18 | OE1 (3-STATE Enable) | Active-LOW enable for outputs O4–O7 - independent control group allowing partial bus gating without full device disable. |
| 11, 13, 15, 17, 19, 20, 10, 16 | O0–O7 (Outputs) | Inverting 3-STATE outputs - sink/source ±24mA; enter high-Z when respective OE is HIGH; pin 16 serves dual role as O6 and OE1. |
| 10 | GND | Ground reference - dedicated low-inductance return path for quiet switching; part of split ground bus architecture. |
| 20 | VCC | Positive supply - decoupling required within 1cm due to high di/dt; powers internal Quiet Series™ noise suppression circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Switching Noise Reduction | ICC and IOZ reduced by 50% vs. standard ACT240 - lowers power rail disturbance during multi-bit bus transitions. |
| Guaranteed Pin-to-Pin Skew | tOSHL/tOSLH ≤ 1.0ns @ 5V - eliminates timing skew-induced setup/hold violations in parallel address/data lines. |
| Dynamic Threshold Performance | VIHD ≥ 2.2V and VILD ≤ 0.8V @ 5V - maintains noise immunity even under fast edge rates (≥125mV/ns) and ground bounce. |
| Improved Latch-Up Immunity | Withstands ±300mA DC latch-up current - enhances reliability in hot-plug or ESD-prone industrial backplane interfaces. |
| GTO™ Output Control | Integrated gate turn-off logic - actively suppresses overshoot/undershoot transients on output edges without external components. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM/Flash in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting octal buffer isolating CPU address lines while maintaining timing integrity across temperature extremes. Use Value: Guaranteed <1.0ns skew ensures synchronous access to multiple memory banks without address decode glitches. |
Use Scenario: Bidirectional data conditioning between FPGA I/O banks and legacy 5V parallel peripheral bus (e.g., printer port). IC Role / Device Role / Timing Role: 3-STATE line driver/receiver enabling controlled bus sharing with direction control via OE1/OE2. Use Value: ±24mA drive strength sustains signal integrity over 15cm PCB traces with 50pF load, eliminating need for repeaters. |
| Test Equipment Signal Conditioning | Automated Test Fixture Control |
|
Use Scenario: Level-shifting and noise-filtering digital stimulus signals in ATE channel cards operating at 50MHz. IC Role / Device Role / Timing Role: Quiet Series™ buffer suppressing simultaneous switching noise that would corrupt adjacent analog measurement channels. Use Value: VOLP ≤ 1.5V and VOLV ≥ –1.2V limit transient coupling into sensitive DAC/ADC reference planes. |
Use Scenario: Controlling relay arrays and opto-isolator inputs in semiconductor handler test fixtures. IC Role / Device Role / Timing Role: High-current 3-STATE driver providing clean enable/disable sequencing for grouped actuators. Use Value: Independent OE1/OE2 allows staggered activation of relay subsets, reducing inrush current on shared 5V supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT240N | No Quiet Series™ noise suppression; higher ICC/IOZ; no guaranteed skew spec; VIHD/VILD not characterized dynamically. | Lacks simultaneous switching noise control - unsuitable where adjacent analog or high-speed digital circuits coexist. | Select only if cost sensitivity outweighs noise immunity requirements and board layout allows extra decoupling/filtering. |
| 74LCX240MTCX | Lower VCC range (2.0–3.6V); 3.3V-only compatible; 24mA drive retained but optimized for sub-3.3V systems. | Not 5V-tolerant; requires level translation when interfacing with legacy 5V peripherals or memory devices. | Prefer for new 3.3V-only designs with space-constrained layouts; avoid in mixed-voltage 5V bus environments. |
Compared with SN74ACT240N and 74LCX240MTCX, the 74ACTQ240PC uniquely delivers factory-guaranteed dynamic noise margins and output skew in a drop-in SOIC-20 package - making it the only choice for industrial bus drivers requiring verified signal integrity without layout redesign.
Availability
74ACTQ240PC is available at Aetrix Electronics and suitable for memory address buffering, industrial bus interface, automated test fixture control, and signal conditioning applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74ACTQ240PC 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
Fairchild Semiconductor was a U.S.-based designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy products remain widely deployed in industrial and automotive systems.
The 74ACTQ240PC belongs to Fairchild's FACT Quiet Series™ product line, engineered specifically for noise-critical bus driving and memory interfacing in dense PCB environments where simultaneous switching noise must be minimized.
FAQ
What is the maximum recommended operating voltage for the 74ACTQ240PC?
The 74ACTQ240PC has a recommended operating supply voltage range of 4.5V to 5.5V. Operation outside this range - especially above 5.5V - risks exceeding absolute maximum ratings and may degrade dynamic threshold performance or increase simultaneous switching noise. The 74ACTQ240PC is not rated for 3.3V-only operation, unlike LCX-series variants.
Does the 74ACTQ240PC support independent control of output groups?
Yes, the 74ACTQ240PC provides two independent 3-STATE enable inputs: OE1 controls outputs O4–O7 (pins 12, 14, 16, 18), and OE2 controls outputs O0–O3 (pins 3, 5, 7, 9). This allows selective bus segmentation - for example, enabling only upper address bits while holding lower bits in high-Z - without disabling the entire device. This functionality is confirmed in the truth table and pin descriptions of the 74ACTQ240PC datasheet.
What does "Quiet Series™" mean for the 74ACTQ240PC?
"Quiet Series™" refers to Fairchild's proprietary noise-suppression architecture integrated into the 74ACTQ240PC, featuring GTO™ output control, undershoot correction, and a split ground bus. It reduces ICC and IOZ by 50% versus standard ACT240, guarantees simultaneous switching noise levels, and specifies dynamic input thresholds (VIHD/VILD) - all validated per the 74ACTQ240PC test methodology using 1MHz toggling and oscilloscope-based noise waveform capture.
Is the 74ACTQ240PC pin-compatible with the standard 74ACT240?
Yes, the 74ACTQ240PC is pin-compatible with the 74ACT240 in SOIC-20 (M20B) packaging - same pin count, identical pinout, and matching JEDEC MS-013 footprint. However, the 74ACTQ240PC adds Quiet Series™ features without altering physical connectivity, enabling drop-in replacement where enhanced noise immunity and guaranteed skew are required.
What is the minimum input edge rate supported by the 74ACTQ240PC?
The 74ACTQ240PC specifies a minimum input edge rate of 125mV/ns for VIN transitions from 0.8V to 2.0V at VCC = 4.5V or 5.5V. This requirement ensures reliable dynamic threshold tracking and prevents metastability during fast signal transitions - a specification explicitly defined for the 74ACTQ240PC in the Recommended Operating Conditions table and validated using HP 8180A word generators and Tektronix 7854 oscilloscopes.
74ACTQ240PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74ACTQ240PC FAQ
1.How can I place an order for 74ACTQ240PC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ240PC 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 74ACTQ240PC reliable?
The price and inventory of 74ACTQ240PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ240PC is usually 5 days.
3.What payment methods are accepted for 74ACTQ240PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ240PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ240PC?
74ACTQ240PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ240PC 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 74ACTQ240PC?
For technical support, including 74ACTQ240PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ240PC requirements.
6.How does Aetrix verify that 74ACTQ240PC is sourced from the original manufacturer or authorized distributors?
All 74ACTQ240PC 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 74ACTQ240PC meets industry standards.
7.What is the process for return or replacement of 74ACTQ240PC?
All 74ACTQ240PC units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ240PC, 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 74ACTQ240PC part is unused and in its original packaging.
Return procedure for 74ACTQ240PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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