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onsemi 74ACQ241PC
- Part No.:
- 74ACQ241PC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74ACQ241PC.pdf
- Description:
- IC BUFF NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,425
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Product details
Overview
74ACQ241PC from Fairchild Semiconductor is an octal non-inverting buffer/line driver with 3-STATE outputs in a 20-pin PDIP package, operating from 2.0V to 6.0V, sourcing/sinking ±24 mA per output, and featuring guaranteed pin-to-pin skew and FACT Quiet Series™ noise suppression for memory address and clock bus driving.
For engineers reviewing the 74ACQ241PC datasheet, pinout, applications, or equivalent options, key selection criteria include simultaneous switching noise immunity (VOLP ≤ 1.5 V), dynamic input thresholds (VIHD = 3.5 V @ 5V), tPHL/tPLH ≤ 6.5 ns at 5V, and 3-STATE enable timing (tPZL ≤ 10.0 ns).
Technical Context
The 74ACQ241PC implements dual independent 3-STATE enable controls (OE1 on pins 12/14/16/18; OE2 on pins 3/5/7/9) for four-output groups, enabling selective bus isolation. Its FACT Quiet Series™ architecture integrates GTO™ output control and undershoot correction with a split ground bus to suppress simultaneous switching noise.
It delivers improved latch-up immunity and reduced ICC/IOZ (50% lower than standard AC), with guaranteed AC performance across −40°C to +85°C and supply voltages from 2.0V to 6.0V - supporting mixed-voltage system interfacing and legacy TTL/CMOS bus termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Output Drive | ±24 mA per output - sufficient to drive 50 pF loads with <6.5 ns propagation delay at 5 V. |
| tPHL / tPLH | ≤6.5 ns @ VCC = 5.0 V, CL = 50 pF - enables high-speed address/data buffering in memory subsystems. |
| tPZL / tPLZ | ≤10.0 ns @ VCC = 5.0 V - ensures fast bus release and acquisition for time-critical multiplexed buses. |
| VOLP (Quiet Output) | ≤1.5 V @ VCC = 5.0 V - quantifies worst-case dynamic low-level noise during simultaneous switching, critical for signal integrity. |
| VIHD / VILD | 3.5 V / 1.5 V @ VCC = 5.0 V - defines dynamic input voltage thresholds that prevent oscillation under noise stress. |
| ICC (Quiescent) | ≤40 µA @ VCC = 5.5 V - enables low-static-power operation in battery-backed or standby systems. |
Pinout & Package
74ACQ241PC is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide (Package Number N20A), with through-hole mounting and industry-standard footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 10, 11, 13 | Inputs (I0–I7) | Eight buffered data inputs; non-inverting, compatible with TTL/CMOS logic levels. |
| 3, 5, 7, 9 | OE2 (3-STATE Enable) | Active-low enable for outputs O0–O3; independent control group for partial bus gating. |
| 12, 14, 16, 18 | OE1 (3-STATE Enable) | Active-low enable for outputs O4–O7; second independent control group for segmented bus management. |
| 15, 17, 19, 20, 19, 17, 15, 13 | Outputs (O0–O7) | Eight 3-STATE outputs; each sources/sinks ±24 mA, with quiet switching and undershoot correction. |
| 10 | GND | Power ground reference; split ground bus design minimizes ground bounce during switching. |
| 20 | VCC | Positive supply rail; decoupling required within 0.5 inch due to high di/dt noise sensitivity. |
Key Features
| Feature | Design Value |
|---|---|
| GTO™ Output Control | Actively regulates output edge rate to reduce EMI and crosstalk in dense PCB layouts. |
| Undershoot Corrector | Clamps negative transient excursions below ground to ≤−1.2 V (VOLV), protecting downstream inputs. |
| Split Ground Bus | Separates digital and switching ground paths to minimize simultaneous switching noise coupling. |
| Guaranteed Pin-to-Pin Skew | ≤1.5 ns between any two outputs - ensures deterministic timing in parallel bus applications. |
| Improved Latch-Up Immunity | Withstands ±300 mA DC latch-up current - enhances robustness in industrial environments with supply transients. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM/ROM with minimal propagation delay and skew. IC Role / Device Role / Timing Role: Non-inverting buffer with independent 3-STATE enables isolating memory banks during DMA cycles. Use Value: tOSLH ≤ 1.5 ns skew ensures address setup/hold timing margin across all 8 bits; VOLP ≤ 1.5 V prevents false reads during bus contention. |
Use Scenario: Distributing a master system clock to multiple peripheral ICs while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew line driver with quiet switching to reduce jitter accumulation in synchronous systems. Use Value: GTO™ control limits ∆V/∆t to meet minimum 125 mV/ns input edge rate requirement; tPHL ≤ 6.5 ns enables sub-100 MHz clock fanout. |
| Bus Transceiver Interface | Legacy System Glue Logic |
|
Use Scenario: Bidirectional data bus isolation between CPU and I/O peripherals using external direction control. IC Role / Device Role / Timing Role: 3-STATE transmitter/receiver with separate OE1/OE2 for half-duplex arbitration. Use Value: tPZL ≤ 10.0 ns allows rapid bus turnaround; ±24 mA drive supports terminated 50 Ω transmission lines. |
Use Scenario: Interfacing 5 V TTL microcontrollers with 3.3 V FPGAs or ASICs in retrofitted industrial controllers. IC Role / Device Role / Timing Role: Voltage-tolerant level-shifting buffer with guaranteed VIH/VIL over full VCC range. Use Value: VIHD = 3.5 V and VILD = 1.5 V @ 5 V ensure noise-immune recognition of 3.3 V logic highs/lows without external resistors. |
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 |
|---|---|---|---|
| 74AC241PC | No FACT Quiet Series™ features; higher VOLP (2.0 V), no GTO™ or undershoot corrector; tPHL = 7.5 ns @ 5 V. | Lacks simultaneous switching noise suppression; unsuitable for high-density memory buses with tight noise margins. | Select when cost is primary and board layout allows extra decoupling/filtering for noise control. |
| SN74ACT241N | Texas Instruments part; identical pinout and function but different AC specs: tPHL = 5.5 ns, VOLP = 1.3 V, VIHD = 3.4 V @ 5 V. | Higher speed and slightly better noise immunity; requires validation of ACT-series input thresholds in mixed-voltage designs. | Prefer for new designs requiring best-in-class propagation delay and noise margin; verify VIH/VIL compatibility with driving source. |
Compared with 74ACQ241PC, 74AC241PC trades noise performance for cost, while SN74ACT241N offers faster timing and tighter noise control but demands careful input threshold verification in multi-rail systems.
Availability
74ACQ241PC is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus transceiver interface applications requiring stable component supply, long-term obsolescence mitigation, and legacy industrial system support.
Supply support for 74ACQ241PC 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 analog and discrete power products, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The 74ACQ241PC belongs to the FACT Quiet Series™ family, designed specifically for high-density PCBs where simultaneous switching noise and dynamic threshold stability are critical in memory, clock, and bus interface circuits.
FAQ
What is the maximum supply voltage rating for the 74ACQ241PC?
The 74ACQ241PC has an absolute maximum supply voltage (VCC) rating of +7.0 V, but its recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V voids guaranteed AC/DC specifications and risks reliability degradation. The 74ACQ241PC must be operated within 2.0–6.0 V to ensure compliance with tPHL ≤ 6.5 ns, VOH ≥ 4.4 V, and VOL ≤ 0.44 V specifications.
Does the 74ACQ241PC support independent control of output groups?
Yes, the 74ACQ241PC provides two independent 3-STATE enable inputs: OE1 (pins 12, 14, 16, 18) controls outputs O4–O7, and OE2 (pins 3, 5, 7, 9) controls outputs O0–O3. This allows segmented bus management - for example, enabling only upper address bits during instruction fetch while holding lower bits in high-impedance during interrupt handling - a capability confirmed in the truth table and pin descriptions of the 74ACQ241PC datasheet.
What is the quiet output noise specification for the 74ACQ241PC?
The 74ACQ241PC specifies VOLP (maximum dynamic low-level noise on a quiet output) as ≤1.5 V at VCC = 5.0 V, measured under worst-case simultaneous switching conditions per Figure 1 and test procedure in the datasheet. This value reflects the effectiveness of its FACT Quiet Series™ architecture - including GTO™ control and undershoot correction - and is a key differentiator versus standard AC devices like the 74AC241PC.
Can the 74ACQ241PC drive a 50 pF load with guaranteed timing?
Yes, the 74ACQ241PC guarantees tPHL and tPLH ≤ 6.5 ns at VCC = 5.0 V with CL = 50 pF, as specified in the AC Electrical Characteristics table. This load condition matches standard bus termination practices, and the 74ACQ241PC's ±24 mA output drive ensures stable edge rates into such capacitive loads without external buffering.
Is the 74ACQ241PC pin-compatible with the standard 74AC241?
No, the 74ACQ241PC is not pin-compatible with the standard 74AC241. While both are 20-pin octal buffers with 3-STATE outputs, the 74ACQ241PC uses dual independent OE inputs (OE1/OE2) assigned to specific pin locations (3,5,7,9 and 12,14,16,18), whereas the 74AC241 uses a single shared OE input. Substituting the 74ACQ241PC for a 74AC241 would require PCB layout changes to accommodate the distinct enable pin mapping.
74ACQ241PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACQ
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74ACQ241PC FAQ
1.How can I place an order for 74ACQ241PC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACQ241PC 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 74ACQ241PC reliable?
The price and inventory of 74ACQ241PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACQ241PC is usually 5 days.
3.What payment methods are accepted for 74ACQ241PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACQ241PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACQ241PC?
74ACQ241PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACQ241PC 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 74ACQ241PC?
For technical support, including 74ACQ241PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACQ241PC requirements.
6.How does Aetrix verify that 74ACQ241PC is sourced from the original manufacturer or authorized distributors?
All 74ACQ241PC 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 74ACQ241PC meets industry standards.
7.What is the process for return or replacement of 74ACQ241PC?
All 74ACQ241PC units undergo pre-shipment inspection (PSI). If there is an issue with 74ACQ241PC, 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 74ACQ241PC part is unused and in its original packaging.
Return procedure for 74ACQ241PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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