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Diodes Incorporated PI74AVC16834A
- Part No.:
- PI74AVC16834A
- Manufacturer:
- Diodes Incorporated
- Category:
- Universal Bus Functions
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PI74AVC16834A.pdf
- Description:
- IC UNIV BUS DVR 18BIT 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
PI74AVC16834A from Pericom Semiconductor is an 18-bit universal bus driver with 3-state outputs, designed for VCC operation from 1.8V to 3.6V. It features embedded series-output resistors (no external termination required), 2.5ns max propagation delay at 50pF, and supports PC133 SDRAM Registered DIMM applications in memory subsystems.
For engineers reviewing the PI74AVC16834A datasheet, PI74AVC16834A pinout, PI74AVC16834A application, or PI74AVC16834A equivalent, key selection criteria include output impedance control for noise-sensitive DIMM layouts, dual-mode latch/transparent operation via LE and CLK, and compatibility with 1.8V/2.5V/3.3V I/O interfaces in high-speed memory buffering.
Technical Context
The device implements a dual-control architecture: when LE is LOW, it operates transparently (A→Y path enabled); when LE is HIGH, data is latched on the low-to-high CLK transition. OE controls 3-state output enable (active LOW), allowing full bus isolation.
All 18 channels share identical timing behavior: tPLH/tPHL ≤ 4.2ns (VCC = 3.3V, CL = 50pF), tPZH/tPZL ≤ 5.2ns, and setup/hold times (tsu/th) as low as 0.1ns. Output drivers integrate ~25Ω series resistance to suppress undershoot/overshoot without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.8V to 3.6V - supports mixed-voltage memory interfaces including DDR/SDRAM systems |
| Max Propagation Delay | 2.5ns (50pF load) - enables reliable 133MHz clock domain operation in DIMM modules |
| Output Impedance | Embedded ~25Ω series resistor - eliminates need for external termination, reducing BOM count and PCB area |
| IOH/IOL Drive | –12mA / +12mA (VCC = 3.3V) - sufficient for driving multiple memory inputs with controlled edge rates |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade memory module environments |
| Package | 56-pin TSSOP (240 mil wide) - standard footprint compatible with automated SMT assembly |
| ESD Rating | ±2kV HBM - meets JEDEC JESD22-A114 requirements for board-level handling robustness |
Pinout & Package
56-pin plastic TSSOP (240 mil wide), Pb-free & RoHS-compliant (E suffix). Thermal resistance θJA = 81°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 27) | Active-low 3-state enable | Global output disable; places all Y1–Y18 in high-impedance state when HIGH |
| LE (Pin 28) | Active-low latch enable | Controls mode: LOW = transparent pass-through; HIGH = latch on CLK↑ |
| CLK (Pin 26) | Clock input | Edge-triggered sampling point for latched operation; no internal clock buffer |
| A1–A18 (Pins 1–18, 39–40, 42–43, 45–46, 48–49, 51–52, 54–55) | Data inputs | 18-bit parallel input bus; referenced to same VCC/GND as outputs |
| Y1–Y18 (Pins 3–4, 6–7, 9–10, 12–13, 15–16, 18–19, 21–22, 24–25, 30–31, 33–34, 36–37, 39–40, 42–43, 45–46, 48–49, 51–52, 54–55) | 3-state buffered outputs | Each includes integrated series resistor; no external termination needed for DIMM compliance |
| VCC (Pins 11, 14, 23, 32, 35, 41, 44, 47, 50, 53) | Power supply | 10 dedicated VCC pins minimize IR drop and improve noise immunity across wide bus |
| GND (Pins 5, 8, 17, 20, 29, 38, 41, 56) | Ground reference | 8 GND pins provide low-inductance return paths for all 18 channels and control signals |
Key Features
| Feature | Design Value |
|---|---|
| Embedded output termination | Integrated ~25Ω series resistor per output eliminates external resistors and simplifies DIMM layout |
| Dual-mode operation | Selectable transparent (LE=LOW) or edge-triggered latch (LE=HIGH + CLK↑) for flexible timing control |
| Low-noise switching | Controlled slew rate and on-die termination reduce simultaneous switching noise (SSN) in dense memory arrays |
| Wide VCC support | 1.8V/2.5V/3.3V operation enables direct interfacing with DDR, DDR2, and legacy SDRAM I/O standards |
| PC133 DIMM compliant | Meets JEDEC PC133 Registered DIMM specification for timing, drive strength, and signal integrity |
Applications
| Registered DDR SDRAM DIMM Modules | Server Memory Subsystems |
|---|---|
Use Scenario: Buffering address/control signals between memory controller and 168-pin RDIMM modules. IC Role / Device Role / Timing Role: 18-bit unidirectional bus driver providing registered clock distribution and signal integrity enhancement. Use Value: Embedded termination meets PC133 spec without added components, reducing layer count and improving signal fidelity at 133MHz. | Use Scenario: Driving multiple DDR2 memory ranks in enterprise-class servers with strict noise and timing margins. IC Role / Device Role / Timing Role: High-speed address/command repeater with latch mode for skew compensation across long traces. Use Value: 2.5ns propagation delay and <0.1ns setup/hold allow tight timing closure in multi-rank configurations. |
| Industrial Control Memory Interfaces | Test Equipment Memory Boards |
Use Scenario: Interfacing FPGA-based controllers to off-board SDRAM in ruggedized PLC modules. IC Role / Device Role / Timing Role: Voltage-translating bus driver supporting 1.8V FPGA I/O and 2.5V SDRAM interface. Use Value: Single-supply 1.8V–3.6V operation avoids level shifters, lowering power and component count. | Use Scenario: Signal conditioning on high-speed memory test fixtures requiring repeatable edge control. IC Role / Device Role / Timing Role: Precision-controlled output driver used to calibrate timing margins on memory validation boards. Use Value: Guaranteed 2.5ns max delay and ±0.1ns timing variation enable sub-nanosecond measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC16834DGGR | TI part; same pinout, but lacks embedded series resistors - requires external 25Ω termination per output | Not suitable for PC133 DIMM without redesign; higher BOM cost and layout complexity | Choose only if existing design uses TI ecosystem and external termination is acceptable |
| 74LVC16244APAG | 16-bit (not 18-bit), no latch/CLK function, no embedded termination, lower drive (–24mA/+24mA) | Limited to non-DIMM applications like general-purpose bus buffering; cannot replace in registered memory designs | Use only for simpler 16-bit address/data buffering where latch control and DIMM compliance are unnecessary |
Compared with SN74AVC16834DGGR and 74LVC16244APAG, the PI74AVC16834A uniquely combines 18-bit width, embedded termination, and dual-mode (transparent/latch) operation - making it the only drop-in solution for PC133 RDIMM reference designs requiring zero external termination.
Availability
PI74AVC16834A is available at Aetrix Electronics and suitable for registered DIMM manufacturing, server memory module production, and industrial SDRAM interface development requiring stable component supply and long-term lifecycle assurance.
Supply support for PI74AVC16834A 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 timing solutions for memory, networking, and computing applications.
The PI74AVC16834A belongs to Pericom's AVC logic family, engineered specifically for noise-critical, high-density memory module applications where signal integrity and layout simplicity are paramount.
FAQ
What is the function of the LE pin on the PI74AVC16834A?
The LE (Latch Enable) pin determines operational mode: when LOW, the device operates transparently (A inputs pass directly to Y outputs); when HIGH, data on the A-bus is latched on the low-to-high transition of CLK. This dual-mode capability supports both combinatorial and synchronous memory interface timing requirements without external logic.
Does the PI74AVC16834A require external termination resistors?
No. Each Y output integrates a ~25Ω series resistor optimized for PC133 DIMM signal integrity. This eliminates the need for discrete 25Ω resistors near the driver or on the DIMM PCB, reducing component count, layout area, and potential stub effects - a key differentiator versus standard AVC drivers like SN74AVC16834.
Can the PI74AVC16834A operate at 1.8V supply voltage?
Yes. The device is fully specified for VCC = 1.8V ±0.15V, with guaranteed parameters including tPLH ≤ 5.4ns (CL = 30pF), IOH/IOL ≥ ±12mA, and VIH/VIL thresholds scaled appropriately. This enables direct interfacing with 1.8V FPGAs and low-voltage memory controllers without level translation.
How many ground pins does the PI74AVC16834A TSSOP package have?
The 56-pin TSSOP package has eight dedicated GND pins (Pins 5, 8, 17, 20, 29, 38, 41, and 56), strategically distributed to provide low-inductance return paths for all 18 output channels and control signals - critical for maintaining signal integrity in high-speed memory buses.
PI74AVC16834A 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:
- Universal Bus Driver
- Number of Circuits:
- 18-Bit
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
PI74AVC16834A FAQ
1.How can I place an order for PI74AVC16834A through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74AVC16834A 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 PI74AVC16834A reliable?
The price and inventory of PI74AVC16834A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74AVC16834A is usually 5 days.
3.What payment methods are accepted for PI74AVC16834A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74AVC16834A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74AVC16834A?
PI74AVC16834A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74AVC16834A 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 PI74AVC16834A?
For technical support, including PI74AVC16834A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74AVC16834A requirements.
6.How does Aetrix verify that PI74AVC16834A is sourced from the original manufacturer or authorized distributors?
All PI74AVC16834A 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 PI74AVC16834A meets industry standards.
7.What is the process for return or replacement of PI74AVC16834A?
All PI74AVC16834A units undergo pre-shipment inspection (PSI). If there is an issue with PI74AVC16834A, 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 PI74AVC16834A part is unused and in its original packaging.
Return procedure for PI74AVC16834A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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