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onsemi 74ACQ240SJX
- Part No.:
- 74ACQ240SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74ACQ240SJX.pdf
- Description:
- IC BUFF INVERT 6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,722
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Product details
Overview
74ACQ240SJX from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for memory address and clock distribution in high-density PCBs. It operates across 2.0V–6.0V VCC, delivers ±24 mA output drive, guarantees ≤7.0 ns propagation delay at 5.0V, and features Quiet Series™ technology for controlled switching noise. It is used in bus-transceiver interfaces requiring simultaneous signal integrity.
For engineers reviewing the 74ACQ240SJX datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated SOIC-20 pin mapping, confirmed ACQ-series voltage and timing specs, and two manufacturer-validated alternative parts for bus interface design.
Technical Context
The 74ACQ240SJX implements dual 4-bit inverting buffers with independent 3-STATE enable controls (OE1/OE2), each gating four outputs (O0–O3 and O4–O7). Its Quiet Series™ architecture integrates GTO™ output control and undershoot correction to suppress dynamic ground bounce during simultaneous switching.
It supports rail-to-rail input logic (VI = 0V to VCC) and delivers guaranteed VOH ≥ 4.4 V / VOL ≤ 0.44 V at IOH = −24 mA / IOL = 24 mA under 4.5V–5.5V operation. Pin-to-pin skew is specified ≤1.0 ns for same-direction transitions, enabling deterministic timing in synchronous bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 6.0 V - Enables direct interfacing with 3.3 V and 5 V logic domains without level shifters. |
| Output Drive | ±24 mA - Sufficient to drive 50 pF loads across 15 cm traces while maintaining TTL/CMOS-compatible voltage levels. |
| tPHL / tPLH | ≤7.0 ns @ 5.0 V, CL = 50 pF - Supports >100 MHz bus toggle rates with margin for trace delays. |
| IOZ (3-STATE Leakage) | ±2.5 µA max - Ensures minimal current injection into high-impedance bus segments during disable. |
| Simultaneous Switching Noise | VOLP ≤ 1.5 V, VOLV ≥ −1.2 V @ 5.0 V - Quantified quiet-output dynamic voltage excursions measured per FACT test methodology. |
| Input Thresholds | VIH = 2.1 V, VIL = 0.9 V @ VCC = 3.0 V - Guarantees robust noise margins (>0.6 V) in mixed-voltage 3.3 V systems. |
| ICC (Quiescent) | 40.0 µA max @ VCC = 5.5 V - Enables low-static-power operation in always-on control logic paths. |
Pinout & Package
74ACQ240SJX is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D), with standard JEDEC pinout and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-Low 3-STATE enable inputs - Independently disable top/bottom 4-bit output groups to prevent bus contention. |
| 2–9 | I0–I7 | Inverting data inputs - Each drives corresponding output with polarity inversion; compatible with standard address/data bus conventions. |
| 11–18 | O0–O7 | Inverting 3-STATE outputs - Sink/source up to 24 mA; enter high-impedance state when respective OE is HIGH. |
| 10 | GND | Digital ground reference - Dedicated pin minimizes ground bounce coupling between input and output sections. |
| 20 | VCC | Positive supply - Must be decoupled locally (0.1 µF ceramic + 10 µF tantalum) to sustain Quiet Series™ noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Quiet Series™ Output Control | GTO™-gated output drivers reduce dI/dt-induced ground bounce by sequencing internal switching edges. |
| Split Ground Bus Architecture | Separate input and output ground return paths minimize crosstalk between control and driven bus signals. |
| Guaranteed Pin-to-Pin Skew | ≤1.0 ns maximum between any two outputs - Enables reliable multi-bit capture in synchronous receivers without per-bit deskew. |
| Improved Latch-Up Immunity | Rated to ±300 mA DC latch-up current - Withstands transient overvoltage events on I/O pins without destructive failure. |
| Reduced ICC and IOZ | 50% lower quiescent and 3-STATE leakage vs. legacy ACT240 - Extends battery life in portable control modules. |
Applications
| Memory Address Buffering | PCI/ISA Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or Flash memory with tight setup/hold timing. IC Role / Device Role / Timing Role: Inverting buffer with 3-STATE control isolates CPU address bus during DMA cycles. Use Value: ≤7.0 ns propagation delay and ≤1.0 ns output skew ensure deterministic address valid windows across all 16 bits. |
Use Scenario: Level-shifting and direction-controlled data transfer between ISA bus peripherals and embedded controllers. IC Role / Device Role / Timing Role: Dual-enable octal driver acts as bidirectional data path conditioner with noise-suppressed switching. Use Value: VOLP ≤ 1.5 V and VIHD ≥ 3.1 V guarantee immunity to simultaneous switching noise in legacy parallel bus environments. |
| Industrial PLC Backplane Driver | Test Equipment Signal Conditioning |
|
Use Scenario: Distributing clock and control signals across modular I/O chassis with long backplane traces. IC Role / Device Role / Timing Role: Low-skew inverting driver ensures synchronized enable/disable of multiple module clocks. Use Value: ±24 mA drive strength maintains signal integrity over 20 cm FR-4 traces loaded with 50 pF per slot. |
Use Scenario: Isolating DUT signals from ATE pattern generators during high-speed digital test vector loading. IC Role / Device Role / Timing Role: 3-STATE-enabled buffer gates test vectors onto shared probe cards without contention. Use Value: IOZ ≤ ±2.5 µA prevents leakage-induced false triggering during high-impedance test phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AC240SCX | No Quiet Series™ features; lacks GTO™ control and undershoot correction; higher simultaneous switching noise (VOLP up to 2.2 V). | Suitable only in low-noise, low-density layouts where ground bounce is mitigated externally. | Select when cost sensitivity outweighs noise performance and board area allows added decoupling/filtering. |
| SN74ACT240N | ACT-family VCC range limited to 4.5–5.5 V; identical pinout but no split ground bus or Quiet Series™ architecture. | Requires strict 5 V supply; not interoperable with 3.3 V systems without level translation. | Choose only for legacy 5 V-only designs where compatibility with TI's ACT family is mandatory. |
Compared with 74ACQ240SJX, 74AC240SCX offers lower cost but requires external noise mitigation, while SN74ACT240N enforces 5 V operation and lacks integrated noise suppression-neither provides the guaranteed quiet switching or 2.0–6.0 V flexibility of the 74ACQ240SJX.
Availability
74ACQ240SJX is available at Aetrix Electronics and suitable for memory address buffering, industrial backplane signaling, and legacy bus transceiver applications requiring stable component supply, long-term lifecycle support, and consistent SOIC-20 packaging.
Supply support for 74ACQ240SJX 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 analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy logic families remain widely deployed in industrial and automotive systems.
The 74ACQ240SJX belongs to the Quiet Series™ ACQ logic family, engineered specifically for high-density PCBs where simultaneous switching noise and timing skew must be minimized in memory and bus interface circuits.
FAQ
What is the supply voltage range supported by the 74ACQ240SJX?
The 74ACQ240SJX operates across a VCC range of 2.0 V to 6.0 V, making it compatible with both 3.3 V and 5 V logic systems without external level shifters. This range is explicitly guaranteed in the datasheet's Recommended Operating Conditions table and validated across −40°C to +85°C ambient temperature.
Does the 74ACQ240SJX support true bidirectional data flow?
No, the 74ACQ240SJX is an inverting octal buffer with unidirectional signal flow (I0–I7 → O0–O7) and independent 3-STATE enables (OE1/OE2). It does not include internal direction control or bus transceiver logic; bidirectional use requires pairing with complementary devices or external control logic.
What package type is used for the 74ACQ240SJX?
The 74ACQ240SJX uses a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D), with 1.27 mm lead pitch and gull-wing terminations. This matches the mechanical dimensions shown in Figure 8 of the Fairchild datasheet DS010234.
How does the Quiet Series™ technology in the 74ACQ240SJX reduce noise?
The 74ACQ240SJX employs Quiet Series™ features including GTO™ (Ground Terminal Output) control and undershoot correction circuitry, combined with a split ground bus. These elements sequence internal switching edges and isolate input/output ground returns to suppress simultaneous switching noise (SSN), with VOLP/VOLV measured per FACT test methodology.
Is the 74ACQ240SJX pin-compatible with the 74ACTQ240SJX?
Yes, the 74ACQ240SJX and 74ACTQ240SJX share identical pinouts, package dimensions (M20D), and logic function. However, they differ in VCC range (2.0–6.0 V vs. 4.5–5.5 V) and ACQ-specific noise performance; substitution requires verifying supply voltage and noise margin requirements.
74ACQ240SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACQ
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOP
74ACQ240SJX FAQ
1.How can I place an order for 74ACQ240SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACQ240SJX 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 74ACQ240SJX reliable?
The price and inventory of 74ACQ240SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACQ240SJX is usually 5 days.
3.What payment methods are accepted for 74ACQ240SJX?
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4.How is shipping managed for 74ACQ240SJX?
74ACQ240SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACQ240SJX 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 74ACQ240SJX?
For technical support, including 74ACQ240SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACQ240SJX requirements.
6.How does Aetrix verify that 74ACQ240SJX is sourced from the original manufacturer or authorized distributors?
All 74ACQ240SJX 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 74ACQ240SJX meets industry standards.
7.What is the process for return or replacement of 74ACQ240SJX?
All 74ACQ240SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACQ240SJX, 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 74ACQ240SJX part is unused and in its original packaging.
Return procedure for 74ACQ240SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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