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onsemi 74ACTQ16543SSCX
- Part No.:
- 74ACTQ16543SSCX
- Manufacturer:
- onsemi
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACTQ16543SSCX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
74ACTQ16543SSCX from Fairchild Semiconductor is a 16-bit registered transceiver with independent A/B bus registers, 3-STATE outputs, and Quiet Series™ noise suppression. It supports bidirectional data flow with separate latch enable (LEABn/LEBAn) and output enable (OEABn/OEBAn) controls per direction, and delivers ±24 mA drive strength at 4.5–5.5 V supply. Used in high-speed backplane interfaces requiring simultaneous data latching and controlled bus isolation.
For engineers reviewing the 74ACTQ16543SSCX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed pin-to-pin output skew (≤2.6 ns), dynamic threshold immunity (VIHD ≥ 2.0 V, VILD ≤ 0.8 V), simultaneous switching noise control, and byte-level control flexibility for 8-bit or 16-bit system partitioning.
Technical Context
The 74ACTQ16543SSCX implements dual 8-bit register banks-each with independent CEABn/CEBAn (data path enable), LEABn/LEBAn (latch control), and OEABn/OEBAn (output buffer control)-enabling concurrent real-time and stored data transfers. Its back-to-back register architecture allows transparent mode (LE low) and storage mode (LE rising edge) on both A→B and B→A paths without interference.
It uses Fairchild FACT Quiet Series™ technology featuring GTO™ output control and undershoot corrector to suppress simultaneous switching noise. AC performance is specified for both 50 pF and 250 pF loads, with propagation delays (tPLH/tPHL) from 3.0 ns (min) to 16.3 ns (max) depending on load and operating condition.
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 margin against rail droop. |
| Output Drive | ±24 mA - Sufficient to directly drive 50 Ω transmission lines or multiple 74ACT inputs without buffering. |
| Propagation Delay | 3.0–9.0 ns (CL = 50 pF) - Enables sub-100 MHz synchronous bus operation with timing margin. |
| Pin-to-Pin Skew | ≤2.6 ns (data-to-output) - Guarantees deterministic setup/hold timing across all 16 bits for high-reliability capture. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Robust noise immunity with >0.4 V DC noise margin at VCC = 5.0 V. |
| Dynamic Thresholds | VIHD ≥ 2.0 V, VILD ≤ 0.8 V - Maintains reliable switching under fast-edge, high-noise conditions (125 mV/ns min edge rate). |
| Quiet Output Noise | VOLP ≤ 0.8 V, VOHP ≤ VOH + 1.5 V - Limits ground bounce and crosstalk during 16-bit parallel switching. |
Pinout & Package
74ACTQ16543SSCX is housed in a 56-lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" wide (Package Number MS56A), with 0.025" pitch and exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEABn, OEBAn | Active-low 3-STATE output enables | Independent control of A→B and B→A output drivers; HIGH disables outputs to high-impedance state. |
| CEABn, CEBAn | Active-low data path enables | Enable input sampling from A or B bus; LOW permits data entry into respective latches. |
| LEABn, LEBAn | Active-low latch enable | Rising-edge triggered storage: LOW = transparent, HIGH-to-LOW transition captures data. |
| A0–A15 | Bidirectional I/O (A-side) | When CEABn LOW: input to A latches; when OEABn LOW: 3-STATE output from A latches to B bus. |
| B0–B15 | Bidirectional I/O (B-side) | When CEBAn LOW: input to B latches; when OEBAn LOW: 3-STATE output from B latches to A bus. |
Key Features
| Feature | Design Value |
|---|---|
| Back-to-back register architecture | Enables concurrent latching and forwarding: one register holds stored data while the other passes real-time traffic. |
| Byte-selectable control logic | Each 8-bit byte has independent CE/LE/OE pins-supports partial-width bus operation without external gating. |
| Guaranteed simultaneous switching noise control | FACT Quiet Series™ with GTO™ and undershoot corrector ensures VOLP ≤ 0.8 V and VOHP ≤ VOH + 1.5 V under worst-case 15-output switching. |
| Separate A/B bus isolation | Independent enable/latch controls prevent contention between A and B domains during mixed-direction transfers. |
| Multiple load support | AC specs validated for both 50 pF (standard logic loading) and 250 pF (stub-loaded backplanes or long traces). |
Applications
| High-Speed Backplane Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Bidirectional data transfer between CPU and peripheral cards across a 16-bit parallel backplane with stub lengths up to 10 cm. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, noise-immune data capture and retransmission with controlled output enable timing. Use Value: Guaranteed ≤2.6 ns pin skew and ±24 mA drive ensure signal integrity and timing closure at 80 MHz sustained burst rates. | Use Scenario: Isolating and latching sensor/actuator data between field-side and controller-side buses in modular I/O chassis. IC Role / Device Role / Timing Role: Dual-register interface enabling independent read/write handshaking with local storage for fault-tolerant polling cycles. Use Value: Separate CEABn/CEBAn and OEABn/OEBAn allow decoupled control of data ingress/egress-eliminating bus contention during hot-swap transitions. |
| Test Equipment Data Acquisition | Legacy Bus Bridge (ISA/PCI-X) |
Use Scenario: Capturing parallel digital waveforms from DUTs with precise timestamp alignment using external clock and latch strobes. IC Role / Device Role / Timing Role: High-fidelity data sampler with transparent mode for real-time monitoring and latch mode for snapshot capture. Use Value: VIHD ≥ 2.0 V and VILD ≤ 0.8 V maintain valid logic levels even under 125 mV/ns input edge rates from fast-switching DUTs. | Use Scenario: Bridging legacy 16-bit ISA address/data bus to modern controller logic with voltage and timing translation. IC Role / Device Role / Timing Role: Registered level-shifting transceiver providing setup/hold time extension and bus contention prevention. Use Value: tS = 3.0 ns and tH = 1.5 ns meet ISA timing requirements while Quiet Series™ noise control prevents false triggering on shared control lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT16543CTPVCT | Lower ICC (2 µA quiescent vs. 80 µA), faster tPLH (2.5 ns typ), but no Quiet Series™ noise specs; 3.3 V tolerant inputs only. | Optimized for low-power 3.3 V systems; lacks guaranteed simultaneous switching noise metrics and dynamic threshold validation. | Select when power budget is critical and noise environment is controlled; verify VIH/VIL compatibility with 5 V signaling. |
| SN74ALVTH16543GR | 3.3 V supply only, higher drive (±32 mA), supports hot-insertion (Ioff), but no 250 pF load AC specs or Quiet Series™ features. | Designed for hot-pluggable modules; lacks 5 V operation and backplane-grade noise immunity. | Prefer for 3.3 V industrial backplanes requiring live insertion; not drop-in for 5 V legacy designs. |
Compared with 74FCT16543CTPVCT and SN74ALVTH16543GR, the 74ACTQ16543SSCX uniquely combines 5 V operation, guaranteed simultaneous switching noise control, 250 pF load validation, and dual-byte independent control-making it the only option qualified for high-noise, full-5V, legacy backplane applications demanding deterministic skew and dynamic threshold robustness.
Availability
74ACTQ16543SSCX is available at Aetrix Electronics and suitable for high-speed backplane interfaces, industrial PLC I/O modules, test equipment data acquisition, and legacy bus bridge applications requiring stable component supply and long-term obsolescence management.
Supply support for 74ACTQ16543SSCX 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, logic, and power management ICs before its acquisition by ON Semiconductor in 2016. Known for innovation in noise-suppressed logic families.
The 74ACTQ16543SSCX belongs to the ACTQ logic family-designed specifically for high-speed, noise-critical 5 V digital systems where simultaneous switching noise, timing skew, and dynamic threshold stability are design-critical parameters.
FAQ
What is the operating temperature range for the 74ACTQ16543SSCX?
The 74ACTQ16543SSCX is rated for industrial operation from −40°C to +85°C. This range is validated across all DC and AC electrical specifications-including propagation delay, output drive, and noise immunity-ensuring reliable performance in embedded control and instrumentation environments without derating.
Does the 74ACTQ16543SSCX support hot-swap or live-insertion?
The 74ACTQ16543SSCX does not include Ioff (power-off protection) or bus-hold circuitry required for true hot-swap compliance. Its inputs are not designed to tolerate floating states during insertion, and outputs may exhibit undefined behavior if VCC is not established prior to signal application. Use external protection circuitry if live insertion is required.
What is the maximum number of outputs that can switch simultaneously on the 74ACTQ16543SSCX?
The 74ACTQ16543SSCX is characterized for simultaneous switching of up to 15 outputs (with one held static) under both HIGH-to-LOW and LOW-to-HIGH transitions. This is explicitly defined in the datasheet's "FACT Noise Characteristics" section and forms the basis for its guaranteed VOLP, VOHP, VIHD, and VILD specifications.
Can the 74ACTQ16543SSCX be used with 3.3 V logic levels?
The 74ACTQ16543SSCX is a 5 V-only device: its absolute maximum VCC is +7.0 V, but recommended operation is strictly 4.5–5.5 V. Input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) are compatible with 3.3 V CMOS outputs, but driving it from 3.3 V sources requires verifying noise margins; it cannot drive 3.3 V inputs directly without level translation.
Is the 74ACTQ16543SSCX pin-compatible with the standard 74ACT16543?
Yes-the 74ACTQ16543SSCX is functionally and pin-compatible with the base 74ACT16543, sharing identical pinout, logic behavior, and package dimensions (MS56A SSOP). The "Q" suffix denotes inclusion of Fairchild Quiet Series™ enhancements, which improve noise performance without altering pin assignment or timing interface.
74ACTQ16543SSCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- 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:
- 56-SSOP
74ACTQ16543SSCX FAQ
1.How can I place an order for 74ACTQ16543SSCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ16543SSCX 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 74ACTQ16543SSCX reliable?
The price and inventory of 74ACTQ16543SSCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ16543SSCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ16543SSCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ16543SSCX transactions.
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4.How is shipping managed for 74ACTQ16543SSCX?
74ACTQ16543SSCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ16543SSCX 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 74ACTQ16543SSCX?
For technical support, including 74ACTQ16543SSCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ16543SSCX requirements.
6.How does Aetrix verify that 74ACTQ16543SSCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ16543SSCX 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 74ACTQ16543SSCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ16543SSCX?
All 74ACTQ16543SSCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ16543SSCX, 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 74ACTQ16543SSCX part is unused and in its original packaging.
Return procedure for 74ACTQ16543SSCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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