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onsemi 74ACTQ16244SSCX
- Part No.:
- 74ACTQ16244SSCX
- Manufacturer:
- onsemi
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACTQ16244SSCX.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,689
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Product details
Overview
74ACTQ16244SSCX from Fairchild Semiconductor is a 16-bit non-inverting buffer/line driver with nibble-controlled 3-STATE outputs, designed for memory and address bus driving, clock distribution, and bidirectional bus interfacing. It delivers ±24 mA output drive, guarantees pin-to-pin output skew ≤4.3 ns, operates across 4.5–5.5 V supply, and supports 50 pF and 250 pF load conditions.
For engineers reviewing the 74ACTQ16244SSCX datasheet, pinout, applications, or equivalent options, key selection criteria include simultaneous switching noise immunity (VOLP ≤0.8 V), dynamic input threshold margins (VIHD ≥1.7 V, VILD ≤1.2 V), and guaranteed 3-STATE enable/disable timing under industrial temperature range (–40°C to +85°C).
Technical Context
The 74ACTQ16244SSCX implements four independent 4-bit nibbles, each with dedicated active-low Output Enable (OEn) control - enabling flexible partial-bus gating without external logic. All outputs are non-inverting and share identical DC/AC characteristics across nibbles.
It leverages Fairchild's FACT Quiet Series architecture with GTO output control, ensuring controlled edge rates and minimized ground bounce during simultaneous switching. Propagation delays (tPLH/tPHL = 2.5–7.3 ns @ 5 V, 50 pF) and 3-STATE transition times (tPZH/tPHZ = 2.3–7.9 ns) are specified across full operating temperature and voltage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems and tolerance against rail droop. |
| Output Drive | ±24 mA - sufficient to directly drive 50 Ω transmission lines or multiple 74-series inputs without buffering. |
| Propagation Delay | 2.5 ns (min) to 7.3 ns (max) @ 5 V, 50 pF - enables reliable operation in high-speed address/data buses up to ~100 MHz. |
| Pin-to-Pin Skew | ≤4.3 ns (tOST) - critical for maintaining data integrity across parallel bus lanes during synchronous transfers. |
| Simultaneous Switching Noise | VOLP ≤0.8 V @ 5 V - quantifies worst-case quiet-output voltage perturbation during multi-output transitions. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - provides 0.4 V noise margin at VCC = 5 V, supporting robust logic-level interfacing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications without derating. |
Pinout & Package
74ACTQ16244SSCX is packaged in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch. Thermal and mechanical dimensions conform to Fairchild Package Number MS48A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEn (n=1–4) | Active-Low Output Enable per Nibble | Each controls 4 outputs (e.g., OE1 → O0–O3); tying all OEn together enables full 16-bit operation. |
| I0–I15 | Buffer Input | Non-inverting data inputs; accept standard TTL/CMOS logic levels; VIH/VIL thresholds defined per spec. |
| O0–O15 | 3-STATE Output | Drive capability ±24 mA; high-impedance state entered when corresponding OEn = HIGH. |
| VCC, GND | Power Supply Pins | Multiple VCC/GND pairs distributed across package to minimize switching noise and IR drop. |
Key Features
| Feature | Design Value |
|---|---|
| Nibble-Controlled 3-STATE | Four independent OE inputs allow selective activation of 4-bit segments - reduces bus contention and EMI in partial-width transfers. |
| FACT Quiet Series GTO Control | Guaranteed VOLP ≤0.8 V and VOHP ≤VOH+1.5 V - suppresses ground bounce and supply droop during multi-output switching. |
| Guaranteed Output Skew | tOST ≤4.3 ns - ensures deterministic timing alignment across all 16 outputs, essential for parallel bus hold-time compliance. |
| Dual Load Spec Compliance | AC parameters validated at both 50 pF and 250 pF - supports design reuse across low-capacitance PCB traces and heavily loaded backplanes. |
| Dynamic Input Threshold Margin | VIHD ≥1.7 V and VILD ≤1.2 V @ 5 V - defines noise-immune switching windows under fast-edge, high-dI/dt conditions. |
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: Non-inverting buffer with 3-STATE isolation during memory read cycles to prevent bus contention. Use Value: ±24 mA drive ensures full-rail swing into 50 pF loads; tPLH ≤7.3 ns maintains timing margin at 25 MHz bus clocks. |
Use Scenario: Level-shifting and bus isolation between legacy PCI/ISA controller and peripheral add-in cards. IC Role / Device Role / Timing Role: Bidirectional line driver with nibble-selectable 3-STATE control for multiplexed address/data lanes. Use Value: Independent OE pins allow staggered enable timing to reduce peak current draw and meet PCI slot power limits. |
| Clock Distribution Network | Industrial I/O Expansion Module |
Use Scenario: Fan-out of a system clock to multiple synchronous peripherals (ADCs, DACs, FPGAs) requiring matched skew. IC Role / Device Role / Timing Role: Low-skew clock buffer with 3-STATE disable for dynamic clock gating. Use Value: tOST ≤4.3 ns ensures <1 UI jitter across 16 outputs; QUIET Series minimizes clock signal corruption from adjacent switching. |
Use Scenario: Interfacing a microcontroller GPIO port to 16-channel industrial digital I/O modules with LED indicators and relay drivers. IC Role / Device Role / Timing Role: High-drive buffer isolating MCU pins from noisy inductive loads and long cables. Use Value: 24 mA sink/source supports direct LED drive; –40°C to +85°C rating ensures reliability in factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT16244DGGR | TI part in 48-pin TSSOP; identical logic function and DC specs, but tPLH/tPHL max = 8.5 ns (vs. 7.3 ns) and no published VOLP/VOLV noise data. | Lacks guaranteed simultaneous switching noise specs - less suitable for noise-sensitive clock or high-density bus applications. | Select when cost or TI ecosystem preference outweighs need for certified quiet switching performance. |
| 74FCT16244CTPAG | IDT part in 48-pin TSSOP; FCT logic family - lower ICC (2 µA typical vs. 80 µA), but only rated for 4.75–5.25 V and lacks 250 pF AC characterization. | Narrower VCC range and missing high-capacitance timing data limit use in wide-tolerance or backplane designs. | Prefer for ultra-low static power systems where supply regulation is tight and load capacitance remains ≤50 pF. |
Compared with SN74ACT16244DGGR and 74FCT16244CTPAG, the 74ACTQ16244SSCX uniquely combines guaranteed quiet-output noise metrics, dual-load AC validation, and wider industrial VCC tolerance - making it the most robust choice for mission-critical bus and clock buffering where signal integrity is non-negotiable.
Availability
74ACTQ16244SSCX is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and embedded I/O expansion modules requiring stable component supply and long-term industrial qualification.
Supply support for 74ACTQ16244SSCX 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 leading analog and mixed-signal IC manufacturer, acquired by ON Semiconductor in 2016; its legacy ACTQ logic family remains widely deployed in industrial and computing infrastructure.
The 74ACTQ16244SSCX belongs to Fairchild's FACT Quiet Series - engineered specifically for high-speed digital systems demanding low-noise, low-skew, and high-drive bus interface solutions in electrically noisy environments.
FAQ
What is the maximum number of outputs that can switch simultaneously on the 74ACTQ16244SSCX without violating noise specifications?
The 74ACTQ16244SSCX is characterized for simultaneous switching of up to 16 outputs under defined test conditions (1 MHz toggle, 50 Ω/50 pF load). Its VOLP ≤0.8 V and VOHP ≤VOH+1.5 V specs are guaranteed for worst-case multi-output transitions, as verified per Fairchild's FACT Noise Characteristics test methodology using PC-163A fixture and controlled edge rates.
Does the 74ACTQ16244SSCX support operation at 3.3 V supply?
No, the 74ACTQ16244SSCX is not rated for 3.3 V operation. Its recommended operating supply is strictly 4.5 V to 5.5 V, with absolute maximum VCC = 7.0 V. Attempting 3.3 V operation will result in undefined logic thresholds, insufficient output drive, and failure to meet AC timing or noise specifications.
How are the nibble control inputs (OE1–OE4) configured for full 16-bit operation?
For full 16-bit operation, OE1 through OE4 are externally shorted together and driven by a single control signal. This configuration causes all 16 outputs to enter 3-STATE (high-impedance) simultaneously when the combined OE is HIGH, or to drive their respective inputs when LOW - preserving functional equivalence to a unified 16-bit buffer.
What is the significance of the 'Q' in 74ACTQ16244SSCX?
The 'Q' in 74ACTQ16244SSCX denotes Fairchild's Quiet Series implementation - a proprietary enhancement to the standard ACT logic family that incorporates GTO (Ground Terminal Optimization) output structure and layout techniques to guarantee simultaneous switching noise performance, including VOLP, VOLV, VOHP, and VOHV limits defined in the datasheet.
Is the 74ACTQ16244SSCX pin-compatible with the standard 74ACT16244?
Yes, the 74ACTQ16244SSCX is pin-compatible with the base 74ACT16244 in the same SSOP-48 package (MS48A). Both share identical pinout, electrical interface, and logic function; the 'Q' variant adds guaranteed noise performance and tighter skew control without altering physical or functional connectivity.
74ACTQ16244SSCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- 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:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74ACTQ16244SSCX FAQ
1.How can I place an order for 74ACTQ16244SSCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ16244SSCX 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 74ACTQ16244SSCX reliable?
The price and inventory of 74ACTQ16244SSCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ16244SSCX is usually 5 days.
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74ACTQ16244SSCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ16244SSCX 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 74ACTQ16244SSCX?
For technical support, including 74ACTQ16244SSCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ16244SSCX requirements.
6.How does Aetrix verify that 74ACTQ16244SSCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ16244SSCX 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 74ACTQ16244SSCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ16244SSCX?
All 74ACTQ16244SSCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ16244SSCX, 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 74ACTQ16244SSCX part is unused and in its original packaging.
Return procedure for 74ACTQ16244SSCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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