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onsemi 74ACQ240SC
- Part No.:
- 74ACQ240SC
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACQ240SC.pdf
- Description:
- IC BUFF INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,396
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Product details
Overview
74ACQ240SC from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for memory address driving, clock distribution, and bus-oriented data transmission in high-density PCBs. It operates across 2.0V–6.0V supply, delivers ±24 mA output drive, guarantees ≤7.0 ns propagation delay at 5.0V, and features Quiet Series™ technology for controlled switching noise.
For engineers reviewing the 74ACQ240SC datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, SOIC-20 package mapping, ACQ-series DC/AC specifications, noise-immune dynamic threshold behavior, and validated alternatives for bus interface upgrades.
Technical Context
The 74ACQ240SC implements dual independent 3-STATE enable logic (OE1/OE2) controlling two groups of four inverting outputs (O0–O3 and O4–O7), each driven by corresponding inputs (I0–I7). Its Quiet Series™ architecture integrates GTO™ output control and undershoot correction with a split ground bus to suppress simultaneous switching noise.
It guarantees pin-to-pin skew ≤1.0 ns between any two outputs switching in the same direction, supports dynamic input thresholds (VIHD/VILD) up to 3.85V/1.65V at 5.0V, and maintains stable VOH/VOL performance under 24 mA load - critical for TTL- and CMOS-compatible bus termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0V to 6.0V - enables interoperability with 3.3V and 5V logic systems without level shifters |
| Output Drive Strength | ±24 mA - sufficient to directly drive 50-pF loads with 10 ns edge rates on standard PCB traces |
| Propagation Delay (tPLH/tPHL) | ≤7.0 ns at VCC = 5.0V, CL = 50 pF - ensures timing compliance in 100 MHz bus cycles |
| 3-STATE Enable/Disable Time | tPZL ≤ 8.5 ns, tPLZ ≤ 9.5 ns - minimizes bus contention during multiplexed address/data handshaking |
| Simultaneous Switching Skew | ≤1.0 ns - prevents data corruption in parallel bus architectures with multi-bit transitions |
| Dynamic Input Thresholds | VIHD ≥ 3.1V, VILD ≤ 0.9V at 5.0V - improves noise margin against crosstalk in dense routing environments |
| Quiescent Supply Current | ≤40 µA - reduces standby power in battery-backed or low-power embedded controllers |
Pinout & Package
74ACQ240SC is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (Package Number M20B), with standard 1.27 mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-Low 3-STATE enable inputs - independently disable top/bottom output groups (O0–O3 / O4–O7) |
| 2–9 | I0–I7 | Inverting data inputs - drive complementary outputs; logic HIGH at input yields LOW at output |
| 11–18 | O0–O7 | Inverting 3-STATE outputs - present inverted input state when enabled; high-impedance when OE = HIGH |
| 10 | GND | Digital ground reference - connects to split ground bus for noise isolation in Quiet Series™ design |
| 20 | VCC | Positive supply rail - powers internal logic and output drivers; decoupling required within 10 mm |
Key Features
| Feature | Design Value |
|---|---|
| Quiet Series™ Output Control | GTO™-gated output transistors reduce dI/dt-induced ground bounce and EMI during switching |
| Split Ground Bus Architecture | Separates digital and output return paths to minimize coupling between switching outputs and sensitive inputs |
| Undershoot Correction Circuitry | Actively clamps negative voltage excursions below GND to ≤−0.6V, protecting downstream CMOS inputs |
| Guaranteed Dynamic Threshold Performance | VIHD ≥ 3.1V and VILD ≤ 0.9V ensure reliable operation under simultaneous switching noise up to 1.5V peak |
| Reduced ICC and IOZ | Quiescent current ≤40 µA and 3-STATE leakage ≤±2.5 µA lower power consumption vs. standard ACT240 |
Applications
| Memory Address Buffering | Microprocessor Bus Driver |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or EPROM with minimal trace length. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fanout amplification while maintaining setup/hold timing margins. Use Value: Guaranteed ≤7.0 ns propagation delay and ≤1.0 ns output skew prevent address decode glitches during high-speed memory access. |
Use Scenario: Isolating bidirectional data bus segments between CPU and peripheral ICs using 3-STATE control. IC Role / Device Role / Timing Role: Bus-oriented transmitter/receiver enabling time-multiplexed read/write operations via OE1/OE2 sequencing. Use Value: Independent OE1/OE2 pins allow staggered enable timing to eliminate bus contention in multi-master systems. |
| Clock Distribution Network | Industrial I/O Expansion Interface |
Use Scenario: Distributing a system clock signal to multiple synchronous peripherals requiring matched edge timing. IC Role / Device Role / Timing Role: Low-skew inverting line driver ensuring synchronized clock edges across distributed loads. Use Value: Pin-to-pin skew ≤1.0 ns and quiet switching reduce jitter accumulation in cascaded clock trees. |
Use Scenario: Interfacing PLC backplane signals to isolated digital I/O modules operating at mixed voltage levels. IC Role / Device Role / Timing Role: Level-flexible buffer (2.0–6.0V) translating control signals between 3.3V logic and 5V field-side drivers. Use Value: Wide VCC range and ±24 mA drive support direct connection to optocoupler inputs without external transistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AC240SC | No Quiet Series™ features; lacks GTO™ control, undershoot correction, and split ground bus | Higher simultaneous switching noise; unsuitable for noise-sensitive bus interfaces near analog circuits | Select when cost sensitivity outweighs noise immunity requirements and layout allows extra filtering |
| SN74ACT240N | ACT logic family (4.5–5.5V only); no dynamic VIHD/VILD specs; higher ICC (≤1.5 mA) | Not rated for 3.3V operation; less robust against ground bounce in mixed-voltage systems | Choose for legacy 5V-only designs where ACT speed and compatibility with TI ecosystem are prioritized |
Compared with 74ACQ240SC, 74AC240SC offers lower cost but sacrifices noise control and dynamic threshold stability, while SN74ACT240N provides tighter 5V timing but eliminates 3.3V interoperability and Quiet Series™ benefits - making 74ACQ240SC optimal for mixed-voltage, high-density bus applications demanding signal integrity.
Availability
74ACQ240SC is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus interfacing, clock distribution networks, and industrial I/O expansion requiring stable component supply across extended temperature ranges.
Supply support for 74ACQ240SC 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 semiconductor company specializing in power management, analog, and logic ICs before its acquisition by ON Semiconductor in 2016.
The 74ACQ240SC belongs to Fairchild's Quiet Series™ logic family, engineered specifically to solve simultaneous switching noise and dynamic threshold instability in high-speed digital bus systems.
FAQ
What is the recommended operating voltage range for the 74ACQ240SC?
The 74ACQ240SC is specified for operation from 2.0V to 6.0V, supporting both 3.3V and 5V logic systems without level-shifting circuitry. This wide VCC range allows direct integration into mixed-voltage designs such as FPGA I/O banks interfacing with legacy 5V peripherals. Operation outside this range risks parametric failure or latch-up, per Absolute Maximum Ratings.
Does the 74ACQ240SC support true bidirectional data flow?
No, the 74ACQ240SC is an inverting unidirectional buffer with fixed input-to-output directionality (I0→O0, I1→O1, etc.). It does not implement bus transceivers or direction-control logic. Bidirectional operation requires external control of OE1/OE2 and separate receive-side buffers - the 74ACQ240SC serves only as a transmit-stage driver or isolated address latch.
How does the Quiet Series™ technology in the 74ACQ240SC reduce noise?
The 74ACQ240SC uses three integrated noise-suppression techniques: GTO™ (Gate Turn-Off) output control limits dI/dt during switching, a split ground bus isolates output return currents from logic ground, and active undershoot correction clamps negative transients to −0.6V. These features collectively reduce simultaneous switching noise by 50% versus standard AC devices, as confirmed in FACT Noise Characteristics testing.
Can the 74ACQ240SC replace the 74ACTQ240SC in a design?
Yes, the 74ACQ240SC and 74ACTQ240SC share identical pinout, package (M20B SOIC), and Quiet Series™ features, but differ in supply voltage compatibility: 74ACQ240SC supports 2.0–6.0V, while 74ACTQ240SC is limited to 4.5–5.5V. Substitution is safe if VCC remains ≥4.5V; otherwise, 74ACQ240SC provides broader voltage flexibility without redesign.
What is the maximum capacitive load the 74ACQ240SC can drive reliably?
The 74ACQ240SC is characterized for CL = 50 pF in AC Electrical Characteristics, with guaranteed tPLH/tPHL ≤7.0 ns at 5.0V. While it can drive heavier loads, propagation delay increases linearly with capacitance - e.g., at 100 pF, delay rises ~30%. For >50 pF, verify timing margins in final layout and consider adding series termination resistors to damp reflections.
74ACQ240SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACQ
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74ACQ240SC FAQ
1.How can I place an order for 74ACQ240SC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACQ240SC 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 74ACQ240SC reliable?
The price and inventory of 74ACQ240SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACQ240SC is usually 5 days.
3.What payment methods are accepted for 74ACQ240SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACQ240SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACQ240SC?
74ACQ240SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACQ240SC 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 74ACQ240SC?
For technical support, including 74ACQ240SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACQ240SC requirements.
6.How does Aetrix verify that 74ACQ240SC is sourced from the original manufacturer or authorized distributors?
All 74ACQ240SC 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 74ACQ240SC meets industry standards.
7.What is the process for return or replacement of 74ACQ240SC?
All 74ACQ240SC units undergo pre-shipment inspection (PSI). If there is an issue with 74ACQ240SC, 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 74ACQ240SC part is unused and in its original packaging.
Return procedure for 74ACQ240SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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