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Diodes Incorporated PI74AVC+16268A
- Part No.:
- PI74AVC+16268A
- Manufacturer:
- Diodes Incorporated
- Category:
- Universal Bus Functions
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PI74AVC+16268A.pdf
- Description:
- IC RGSTRD BUS EXCHANGER 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,314
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Product details
Overview
PI74AVC+16268A from Pericom Semiconductor is a 12-bit to 24-bit registered bus exchanger with 3-state outputs, designed for synchronous bidirectional data exchange between narrow high-speed and wide lower-frequency buses. It operates from 1.65V to 3.6V VCC, delivers ±24mA balanced drive at 3.3V, and features IOFF support for partial power-down operation in industrial systems (-40°C to +85°C).
For engineers reviewing the PI74AVC+16268A datasheet, PI74AVC+16268A pinout, PI74AVC+16268A application, or PI74AVC+16268A equivalent, this device enables deterministic timing control in memory-mapped I/O bridges, FPGA-to-ASIC interconnects, and multi-bus system controllers where voltage-level flexibility and noise-controlled drive are critical.
Technical Context
The PI74AVC+16268A implements dual-path registered data flow: a two-stage pipeline for A-to-1B transfer and single-register storage for A-to-2B, enabling sequential 12-bit words to be assembled synchronously into a 24-bit B-port word on CLK edges. All control inputs (CLKEN1B, CLKEN2B, CLKENA1, CLKENA2, SEL) are registered and synchronized to CLK.
Its patented Dynamic Drive Control (DDC) circuit reduces switching noise without increasing propagation delay, while 3.6V-tolerant I/O allows interfacing with legacy 3.3V or 2.5V logic despite 1.65–3.6V core supply. Output enables OEA and OEB are registered, ensuring synchronous bus direction changes and predictable high-impedance entry during power-up when OE is pulled up and clocked promptly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables interoperability across 1.8V, 2.5V, and 3.3V system domains without level shifters. |
| Drive Strength | ±24mA at 3.3V - Sufficient to drive 50Ω transmission lines or multiple CMOS loads with controlled edge rates. |
| I/O Voltage Tolerance | 3.6V - Allows safe connection to 3.3V buses even when VCC = 1.65V, eliminating external clamping diodes. |
| Operating Temperature | -40°C to +85°C - Qualified for industrial-grade embedded control, automation, and communications equipment. |
| Propagation Delay (tPD) | 1.3ns max at VCC = 3.3V - Supports >100MHz clock rates in registered bus architectures with tight timing budgets. |
| IOFF Support | Active during partial power-down - Prevents current backflow when one side of the bus is unpowered, protecting downstream logic. |
| Dynamic Drive Control | Patented DDC circuit - Reduces simultaneous switching noise (SSN) without degrading tPD, easing PCB layout and EMI compliance. |
Pinout & Package
PI74AVC+16268A is housed in a 56-pin 240-mil-wide plastic TSSOP (Package A), with 0.5mm pitch, 8.1mm × 14.1mm body, and standard JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Primary clock input | Synchronizes all register updates and data transfers; low-to-high transition latches data into internal registers. |
| SEL | Bus select control | Synchronous selection of 1B or 2B input data for A-port outputs; registered to avoid metastability. |
| OEA, OEB | Active-low output enables | Registered enables ensure glitch-free, synchronous activation/deactivation of A- and B-port drivers. |
| CLKEN1B, CLKEN2B, CLKENA1, CLKENA2 | Per-path clock enables | Gate clocking to individual register stages, enabling selective data path activation without global reset. |
| A1–A12 | 12-bit port A inputs/outputs | Bidirectional interface for narrow high-speed bus; driven by OEA and synchronized to CLK. |
| 1B1–1B12, 2B1–2B12 | 24-bit port B inputs/outputs | Wide lower-frequency bus interface; split into two 12-bit groups for pipelined or parallel access. |
| VCC, GND | Power and ground | Single-supply operation; 56-pin layout includes multiple VCC/GND pairs for low-impedance decoupling and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 12-to-24-bit registered bus exchange | Enables synchronous widening of data paths in FPGA-ASIC interfaces and memory-mapped peripherals without external FIFOs. |
| Dual-path architecture (A→1B pipelined, A→2B registered) | Supports burst-mode 24-bit assembly from two consecutive 12-bit writes, reducing controller overhead. |
| Dynamic Drive Control (DDC) | Reduces simultaneous switching noise by >40% vs. conventional drivers while maintaining sub-1.5ns tPD at 3.3V. |
| IOFF and 3.6V I/O tolerance | Allows hot-plug compatibility and mixed-voltage board design with no external protection components required. |
| Industrial temperature range | Validated operation from -40°C to +85°C ensures reliability in factory automation, telecom infrastructure, and transportation electronics. |
Applications
| Memory-Mapped I/O Bridge | FPGA-to-ASIC Interconnect |
|---|---|
Use Scenario: Connecting a 12-bit microcontroller data bus to a 24-bit peripheral ASIC requiring synchronized burst reads/writes. IC Role / Device Role: Registered bus exchanger performing voltage-agnostic, clock-synchronized data widening and direction control. Use Value: Eliminates need for discrete latches and glue logic; reduces PCB area and routing complexity while guaranteeing setup/hold timing. |
Use Scenario: Interfacing a Xilinx Spartan FPGA's 12-bit AXI-lite slave port to a custom 24-bit datapath ASIC block. IC Role / Device Role: Timing-critical bidirectional bridge with registered control and DDC-enabled clean signal transitions. Use Value: Ensures deterministic latency (≤2 CLK cycles) and eliminates SSN-induced timing violations in high-density FPGA designs. |
| Industrial PLC Backplane Interface | Multi-Protocol Communication Controller |
Use Scenario: Aggregating sensor data from multiple 12-bit ADC channels onto a 24-bit shared backplane bus in programmable logic controllers. IC Role / Device Role: Synchronous bus exchanger with IOFF support for hot-swap module insertion and partial power-down. Use Value: Prevents backfeeding during field-replacement of modules and maintains signal integrity across extended industrial temperature ranges. |
Use Scenario: Supporting concurrent SPI, I²C, and parallel host interface protocols via a shared 24-bit system bus in a protocol translation SoC. IC Role / Device Role: Configurable bus-width adapter enabling time-multiplexed access to heterogeneous peripherals. Use Value: Reduces gate count in the SoC by offloading bus-width conversion and timing synchronization externally. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered bus exchanger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH16T245 | 16-bit dual-supply translator (1.2–3.6V); lacks pipelined A→1B path and DDC circuit. | Requires external clocking logic for 12→24 widening; higher SSN in dense layouts. | Prefer when dual-supply isolation is needed over deterministic 24-bit burst assembly. |
| 74LVC16245A | Non-registered 16-bit transceiver; no internal registers, no CLK/SEL synchronization, max VCC = 3.6V only. | Cannot perform synchronous 12→24 widening; unsuitable for clock-domain bridging. | Select only for simple level-shifting without timing control or bus widening requirements. |
Compared with SN74AVCH16T245 and 74LVC16245A, the PI74AVC+16268A uniquely delivers registered 12-to-24-bit widening with DDC noise suppression and full industrial temperature qualification-making it the sole choice for deterministic, noise-sensitive, multi-cycle bus bridging in embedded control systems.
Availability
PI74AVC+16268A is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-ASIC interconnects, memory-mapped I/O bridges, and multi-protocol communication controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for PI74AVC+16268A 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
Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-speed interface and signal-integrity solutions for computing, communications, and industrial markets before its 2016 acquisition.
The PI74AVC+ series was engineered for low-voltage, high-speed logic bridging-specifically targeting voltage-flexible, noise-sensitive bus interfaces in FPGA-based systems and industrial controllers.
FAQ
What is the minimum recommended pull-up resistor value for OEA/OEB during power-up?
The minimum pull-up resistor value is determined by the current-sinking capability of the driver driving OE. Per the datasheet, OE must be tied to VCC through a pullup resistor; the exact value depends on the driver's sink current rating and required rise time. For typical 3.3V systems with ≤4mA sink capability, 4.7kΩ is commonly used to ensure reliable high-impedance entry before first clock edge.
Does PI74AVC+16268A support asynchronous bus direction changes?
No. Bus direction changes are fully synchronous to CLK because OEA and OEB are registered control inputs. Direction change occurs only on the low-to-high CLK transition following assertion of the enable signal, eliminating glitches and ensuring deterministic timing alignment across all 24 B-port outputs.
Can PI74AVC+16268A operate reliably at 1.65V VCC with 3.3V I/O signals?
Yes. Its 3.6V-tolerant I/O structure allows inputs and outputs to safely handle 3.3V signals even when VCC = 1.65V. This is confirmed by the Absolute Maximum Rating (VO = –0.5V to +4.6V) and DC Electrical Characteristics tables, which specify VIH/VIL thresholds referenced to VCC-not fixed voltages.
How does the DDC circuit reduce noise without affecting propagation delay?
The patented Dynamic Drive Control circuit dynamically adjusts output driver strength during signal transitions-reducing slew rate at voltage midpoints while maintaining full drive at logic thresholds. This lowers di/dt-induced noise and crosstalk without extending the time between input and valid output, preserving tPD specifications across all VCC conditions.
PI74AVC+16268A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74AVC+
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Registered Bus Exchanger
- Number of Circuits:
- 12 ~ 24-Bit
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
PI74AVC+16268A FAQ
1.How can I place an order for PI74AVC+16268A through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74AVC+16268A 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 PI74AVC+16268A reliable?
The price and inventory of PI74AVC+16268A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74AVC+16268A is usually 5 days.
3.What payment methods are accepted for PI74AVC+16268A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74AVC+16268A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74AVC+16268A?
PI74AVC+16268A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74AVC+16268A 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 PI74AVC+16268A?
For technical support, including PI74AVC+16268A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74AVC+16268A requirements.
6.How does Aetrix verify that PI74AVC+16268A is sourced from the original manufacturer or authorized distributors?
All PI74AVC+16268A 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 PI74AVC+16268A meets industry standards.
7.What is the process for return or replacement of PI74AVC+16268A?
All PI74AVC+16268A units undergo pre-shipment inspection (PSI). If there is an issue with PI74AVC+16268A, 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 PI74AVC+16268A part is unused and in its original packaging.
Return procedure for PI74AVC+16268A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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