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onsemi 74ACTQ652SCX
- Part No.:
- 74ACTQ652SCX
- Manufacturer:
- onsemi
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACTQ652SCX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,720
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Product details
Overview
74ACTQ652SCX from Fairchild Semiconductor is an octal bus transceiver/register with dual D-type flip-flop registers, independent A/B clocking (CPAB/CPBA), dual select (SAB/SBA), and dual 3-state output enables (OEAB/OEBA). It operates at 4.5–5.5 V, delivers ±24 mA drive, supports real-time or registered data routing between 8-bit buses, and is used in high-noise-margin board-level bus arbitration and data staging in industrial control backplanes.
For engineers reviewing the 74ACTQ652SCX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed simultaneous switching noise suppression (VOLP ≤ 1.5 V, VOLV ≥ −1.2 V), pin-to-pin skew < 1.0 ns, TTL-compatible inputs, and SOIC-24 packaging with JEDEC MS-013 footprint compatibility.
Technical Context
The 74ACTQ652SCX implements a multiplexed transceiver architecture with two independent 8-bit D-type register banks-one per bus-enabling concurrent storage of A- and B-bus data on separate LOW-to-HIGH clock edges. Its GTO™ output control and split ground bus reduce ground bounce during simultaneous switching.
It supports four operational modes: real-time bidirectional transfer, stored-A-to-B + stored-B-to-A transfer, isolated register hold, and selective register update-all controlled by OEAB, OEBA, SAB, and SBA logic combinations without requiring external latching. Dynamic input thresholds (VIHD = 2.2 V, VILD = 0.8 V at VCC = 5.0 V) ensure robust noise immunity under fast edge rates (≥125 mV/ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerance for supply ripple. |
| Output Drive | ±24 mA - Supports direct driving of multiple TTL loads or termination-resistor networks without buffers. |
| Propagation Delay | tPLH/tPHL ≤ 10.5 ns - Enables reliable operation up to 25 MHz system clocks with timing margin. |
| Simultaneous Switching Noise | VOLP ≤ 1.5 V, VOLV ≥ −1.2 V - Guarantees signal integrity when ≥23 outputs switch concurrently. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Provides 0.4 V noise margin against TTL-compatible logic levels. |
| Skew | tOSLH/tOSHL ≤ 1.0 ns - Enables deterministic timing across all 16 I/Os in high-speed bus synchronization. |
| Operating Temperature | −40°C to +85°C - Qualified for extended industrial ambient environments without derating. |
Pinout & Package
74ACTQ652SCX is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300-inch body width, with gull-wing leads and standard pitch (1.27 mm). Pin 1 marked via notch or dot; pin 12 and 13 are VCC and GND respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Bi-directional I/O (A bus) | 8-bit data port connected to A-side bus; functions as input or 3-state output depending on OEAB/SAB states. |
| B0–B7 | Bi-directional I/O (B bus) | 8-bit data port connected to B-side bus; functions as input or 3-state output depending on OEBA/SBA states. |
| CPAB | Asynchronous Clock Input | Triggers capture of A-bus data into A-register on LOW-to-HIGH transition, independent of B-bus activity. |
| CPBA | Asynchronous Clock Input | Triggers capture of B-bus data into B-register on LOW-to-HIGH transition, independent of A-bus activity. |
| SAB | Select Control Input | Determines whether A-bus outputs reflect real-time A data (SAB = L) or stored A data (SAB = H). |
| SBA | Select Control Input | Determines whether B-bus outputs reflect real-time B data (SBA = L) or stored B data (SBA = H). |
| OEAB | 3-State Output Enable | Enables/disables A-bus drivers: OEAB = L → A outputs active; OEAB = H → A outputs high-Z. |
| OEBA | 3-State Output Enable | Enables/disables B-bus drivers: OEBA = L → B outputs active; OEBA = H → B outputs high-Z. |
| VCC | Power Supply | Primary 4.5–5.5 V supply connection; decoupling required within 10 mm of pin 12. |
| GND | Ground Reference | Signal and power return; split ground bus design minimizes switching-induced ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| FACT Quiet Series™ Technology | Integrates GTO™ output control and undershoot corrector to suppress simultaneous switching noise below 1.5 V peak. |
| Independent A/B Register Banks | Allows asynchronous capture and retention of A- and B-bus data without cross-contamination or timing interlock. |
| Multiplexed Real-Time + Stored Data Paths | Permits dynamic selection between live bus signals and registered values on each port via SAB/SBA controls. |
| TTL-Compatible Inputs | Accepts standard 0.8 V / 2.0 V logic thresholds, enabling direct interface with legacy 5 V TTL and CMOS logic families. |
| Guaranteed Pin-to-Pin Skew | ≤1.0 ns skew across all outputs ensures deterministic setup/hold timing for synchronous bus handshaking. |
Applications
| Industrial Backplane Arbitration | Legacy Bus Interface Bridging |
|---|---|
Use Scenario: Isolating and synchronizing data flow between CPU and peripheral modules on a shared 8-bit ISA-style backplane with mixed timing domains. IC Role / Device Role / Timing Role: Bidirectional transceiver and staging register that buffers CPU writes to peripherals while holding peripheral reads for CPU sampling. Use Value: Eliminates external latch ICs and reduces PCB trace length mismatch by integrating register+transceiver in one SOIC-24 package with sub-1 ns skew. |
Use Scenario: Interfacing modern microcontroller units with legacy parallel EEPROMs or LCD controllers using non-multiplexed 8-bit address/data buses. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled bus repeater with internal storage to resolve timing mismatches between fast MCU and slow memory access cycles. Use Value: Enables single-cycle read/write handshaking without wait-state insertion, leveraging ±24 mA drive to meet EEPROM input load requirements. |
| Programmable Logic I/O Expansion | Test Equipment Signal Routing |
Use Scenario: Extending FPGA I/O count in boundary-scan test fixtures where registered data staging is required before JTAG scan chain loading. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, noise-immune data capture from FPGA GPIOs into test controller memory space. Use Value: Achieves >25 MHz stable data capture under EMI-heavy test environments due to VOLP ≤ 1.5 V and VIHD ≥ 2.2 V dynamic thresholds. |
Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) mainframes handling multiple DUT interfaces simultaneously. IC Role / Device Role / Timing Role: Multiplexed bus switch enabling dynamic assignment of shared stimulus/response lines between DUT slots. Use Value: Reduces relay count and mechanical wear by replacing electromechanical switches with solid-state, skew-controlled routing (tOSLH ≤ 1.0 ns). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT652ATSO | Lower ICC (2 µA typical vs. 8 µA), faster tPLH (5.5 ns max), but no guaranteed simultaneous switching noise specs. | Preferred for ultra-low-power battery-backed systems where noise margin is secondary to quiescent current. | Choose 74FCT652ATSO only if system-level EMI testing confirms adequate noise immunity without Quiet Series features. |
| SN74ACT652N | PDIP-24 package only; identical AC/DC specs except higher VOLP (1.8 V) and no GTO™ circuitry. | Suitable for prototyping or through-hole designs where SOIC reflow is unavailable. | Use SN74ACT652N for breadboard validation or legacy through-hole assembly; avoid in high-density noise-sensitive layouts. |
Compared with 74ACTQ652SCX, the 74FCT652ATSO trades guaranteed noise suppression for lower power and speed, while the SN74ACT652N sacrifices SOIC packaging and Quiet Series performance for through-hole manufacturability-neither is pin-compatible nor drop-in replaceable without layout or noise margin review.
Availability
74ACTQ652SCX is available at Aetrix Electronics and suitable for industrial backplane arbitration, legacy bus interface bridging, and programmable logic I/O expansion requiring stable component supply, long-term lifecycle support, and JEDEC-compliant SOIC-24 sourcing.
Supply support for 74ACTQ652SCX 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 mixed-signal ICs, acquired by ON Semiconductor in 2016; its ACTQ logic family remains widely supported in industrial and legacy designs.
The 74ACTQ652SCX belongs to Fairchild's Quiet Series™ ACTQ logic line, engineered specifically for noise-critical 5 V bus systems requiring simultaneous multi-bit switching with minimal ground bounce and threshold disturbance.
FAQ
What is the maximum clock frequency supported by the 74ACTQ652SCX?
The 74ACTQ652SCX guarantees operation up to 25 MHz based on its maximum propagation delay of 10.5 ns and minimum clock pulse width of 4.0 ns. Measured fMAX is 35 MHz under ideal conditions (CL = 50 pF, VCC = 5.0 V, TA = +25°C), but system-level timing must account for worst-case skew and noise margins specified in the datasheet.
Does the 74ACTQ652SCX support true bidirectional data flow without external direction control logic?
Yes, the 74ACTQ652SCX enables true bidirectional flow via OEAB and OEBA pins: when OEAB = L and OEBA = L, both A and B ports drive actively; when OEAB = H and OEBA = L, only B drives to A; when OEAB = L and OEBA = H, only A drives to B. No external direction line is needed-the 74ACTQ652SCX manages direction internally through enable states.
Can the 74ACTQ652SCX be used with 3.3 V logic systems?
No, the 74ACTQ652SCX is strictly a 5 V device: its absolute maximum VCC is +7.0 V, but recommended operating range is 4.5–5.5 V, and input thresholds (VIH = 2.0 V min) are optimized for TTL-level signaling. Interfacing with 3.3 V systems requires level translation; direct connection risks undriven inputs and undefined output states.
What does "Quiet Series™" mean for the 74ACTQ652SCX in practical PCB layout terms?
"Quiet Series™" means the 74ACTQ652SCX integrates GTO™ output control and undershoot correction to limit simultaneous switching noise to VOLP ≤ 1.5 V and VOLV ≥ −1.2 V. Practically, this allows tighter trace spacing, reduced ground plane segmentation, and elimination of local ferrite beads-provided VCC/GND decoupling (0.1 µF ceramic + 4.7 µF tantalum) is placed within 5 mm of pins 12 and 13.
Is the 74ACTQ652SCX pin-compatible with the standard 74ACT652?
No, the 74ACTQ652SCX is not pin-compatible with the base 74ACT652: although both are 24-pin SOIC devices with identical pin counts and numbering, the 74ACTQ652SCX includes additional internal circuitry (GTO™, undershoot corrector, split ground bus) that alters internal routing and noise behavior. Layout reuse requires verification of signal integrity and timing-not just pin mapping.
74ACTQ652SCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOP
74ACTQ652SCX FAQ
1.How can I place an order for 74ACTQ652SCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ652SCX 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 74ACTQ652SCX reliable?
The price and inventory of 74ACTQ652SCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ652SCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ652SCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ652SCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ652SCX?
74ACTQ652SCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ652SCX 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 74ACTQ652SCX?
For technical support, including 74ACTQ652SCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ652SCX requirements.
6.How does Aetrix verify that 74ACTQ652SCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ652SCX 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 74ACTQ652SCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ652SCX?
All 74ACTQ652SCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ652SCX, 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 74ACTQ652SCX part is unused and in its original packaging.
Return procedure for 74ACTQ652SCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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