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Diodes Incorporated PI7AT04CEX
- Part No.:
- PI7AT04CEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Specialized ICs
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
PI7AT04CEX.pdf
- Description:
- IC TRANSMISSION LINE CLMP SOT363
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
PI7AT04CEX from Pericom Semiconductor is a 4-channel active transmission line clamp IC designed for high-speed bus termination in CPU and backplane systems. It provides 5V/3.3V line clamping, 5pF typical input capacitance, 4kV HBM ESD protection, and draws ≤10µA quiescent current. It operates over –40°C to +85°C and uses a 6-pin SC70 package.
For engineers reviewing the PI7AT04CEX datasheet, PI7AT04CEX pinout, PI7AT04CEX application, or PI7AT04CEX equivalent, key selection criteria include low-capacitance clamping for signal integrity, zero-delay active clamping versus passive diode solutions, supply voltage flexibility (3.3V/5V), and thermal performance in dense PCB layouts.
Technical Context
The PI7AT04CEX implements voltage-clamp circuitry on four independent I/O lines using internal active transistors-no external biasing or drive power required. Each channel clamps overshoot above VDD and undershoot below GND with near-zero propagation delay.
It supports dual-supply operation: clamping thresholds track VDD (0.3V to 6.3V range at 3.3V supply; up to 6.0V at 5V supply), enabling compatibility across mixed-voltage backplanes. Input capacitance remains stable at 5pF regardless of supply voltage or temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clamping Channels | 4 independent lines-enables single-device termination of quad-bus signals without inter-channel crosstalk. |
| Input Capacitance | 5 pF typical-minimizes signal loading on high-speed traces (e.g., >100 MHz buses) without degrading edge rate. |
| Quiescent Current | ≤10 µA max-eliminates standby power penalty in always-on termination applications like hot-pluggable memory modules. |
| ESD Protection | 4 kV HBM-meets IEC 61000-4-2 Level 3 for robustness against handling and system-level transients. |
| Supply Voltage Range | 3.3 V ±10% or 5 V ±10%-supports legacy and modern logic families on same board without level-shifting. |
| Operating Temperature | –40°C to +85°C-validated for industrial and embedded computing environments with no derating. |
Pinout & Package
Package: 6-pin SC70 (JEDEC MO-203AB), surface-mount, Pb-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| T0 | Channel 0 clamp input/output | Bidirectional I/O-clamps both overshoot (to VDD) and undershoot (to GND) on connected transmission line. |
| T1 | Channel 1 clamp input/output | Independent termination path-no shared impedance; enables per-line impedance matching on multi-drop buses. |
| GND | Ground reference | Low-inductance return path for clamp current-critical for maintaining clamping speed and noise margin. |
| VDD | Positive supply | Defines clamping thresholds; must be decoupled locally (≤100 nF) to suppress supply bounce during transient events. |
| T3 | Channel 3 clamp input/output | Final channel in 4-channel set-supports termination of address/data strobe pairs in parallel interfaces. |
| T2 | Channel 2 clamp input/output | Matches T0–T1 electrical characteristics-ensures uniform timing across all four terminated lines. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-delay active clamping | Eliminates propagation latency inherent in Schottky diode clamps-preserves signal timing integrity on sub-ns edges. |
| No external bias required | Self-powered operation removes need for pull-up resistors or auxiliary supplies-reduces BOM count and layout area. |
| Dynamic impedance compensation | Maintains consistent clamping behavior despite varying characteristic impedance (e.g., when memory cards are inserted/removed). |
| Low EMI generation | Clamps ring voltage without high-frequency resonance-reduces radiated emissions compared to passive RC terminations. |
Applications
| CPU Bus Termination | Backplane Signal Integrity |
|---|---|
|
Use Scenario: High-speed CPU-to-chipset data/address bus with variable stub lengths and hot-pluggable modules. IC Role / Device Role / Timing Role: Active line clamp preventing reflection-induced setup/hold violations on bidirectional DQ lines. Use Value: Enables reliable 200+ MHz DDR signaling without recalculating termination resistors when memory configuration changes. |
Use Scenario: Multi-slot industrial backplane carrying parallel control and status signals between distributed I/O modules. IC Role / Device Role / Timing Role: Per-line transient suppression on 3-inch routed traces subject to connector insertion noise and ground bounce. Use Value: Reduces bit error rate by limiting undershoot below –0.5V and overshoot above VDD+0.5V under load switching. |
| Hot-Swappable Memory Interface | Legacy Parallel Bus Stabilization |
|
Use Scenario: Server motherboard supporting PCIe-attached memory expansion cards with dynamic topology reconfiguration. IC Role / Device Role / Timing Role: Adaptive termination element compensating for impedance discontinuities introduced by card insertion/removal. Use Value: Maintains signal fidelity across full bus width without manual jumper settings or firmware reconfiguration. |
Use Scenario: Industrial PLC base unit interfacing with multiple legacy parallel I/O modules via ribbon-cable harnesses. IC Role / Device Role / Timing Role: Low-capacitance clamp stabilizing TTL/CMOS-level control strobes (e.g., WR#, RD#) on long traces. Use Value: Prevents false triggering caused by ringing on 10–20 ns pulse edges, eliminating need for series damping resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active transmission line clamp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LVD230DR | Differential LVDS receiver with integrated termination-requires differential pair routing and 3.3V-only supply. | Designed for point-to-point LVDS links, not single-ended bus clamping. | Choose only if migrating to LVDS physical layer; not a drop-in replacement for PI7AT04CEX's single-ended clamp function. |
| MAX4894EASA+ | Quad 5V-active terminator with higher 15pF input capacitance and 100µA quiescent current. | Targeted at SCSI and older parallel bus standards with looser timing margins. | Select when legacy 5V-only systems require higher ESD rating (8kV) but can tolerate added capacitive loading. |
Compared with SN65LVD230DR and MAX4894EASA+, the PI7AT04CEX uniquely delivers 5pF capacitance and ≤10µA supply current in a single-ended, dual-voltage (3.3V/5V) clamp-making it optimal for space-constrained, mixed-signal backplanes where signal fidelity and power efficiency are co-prioritized.
Availability
PI7AT04CEX is available at Aetrix Electronics and suitable for CPU bus termination, backplane signal integrity, hot-swappable memory interface, and legacy parallel bus stabilization requiring stable component supply across extended product lifecycles.
Supply support for PI7AT04CEX 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 and communications infrastructure.
The PI7AT04CEX belongs to Pericom's SOTINY™ active clamp product line, engineered specifically to replace passive termination networks in dynamically reconfigurable parallel buses while minimizing power, capacitance, and board area.
FAQ
Can PI7AT04CEX operate with mixed 3.3V and 5V signals on the same device?
No-it uses a single VDD pin to set clamping thresholds for all four channels. All terminated lines must share the same supply voltage (either 3.3V or 5V). Mixing voltage domains requires separate PI7AT04CEX devices per supply domain with isolated VDD/GND nets.
Does PI7AT04CEX require external decoupling capacitors?
Yes-a local 100nF ceramic capacitor between VDD and GND is mandatory per the datasheet. This minimizes supply rail disturbance during fast transient clamping events and prevents oscillation in the active clamp circuitry.
Is PI7AT04CEX compatible with series-terminated transmission lines?
Yes-it functions independently of line termination method. It complements series source termination by suppressing reflections at the receiver end, making it suitable for unterminated or end-terminated topologies where reflections originate at far-end mismatches.
What is the maximum trace length PI7AT04CEX can effectively stabilize?
Effectiveness depends on rise time and impedance discontinuity severity-not absolute length. In documented applications, it stabilizes 3-inch FR-4 traces driven by VCX16244 outputs (tr ≈ 1.8 ns); performance extends to ≥6 inches with controlled impedance and proper layout.
PI7AT04CEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Transmission Line Clamp
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363-6 (SC-70)
- Grade:
- -
- Qualification:
- -
PI7AT04CEX FAQ
1.How can I place an order for PI7AT04CEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7AT04CEX 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 PI7AT04CEX reliable?
The price and inventory of PI7AT04CEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7AT04CEX is usually 5 days.
3.What payment methods are accepted for PI7AT04CEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7AT04CEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7AT04CEX?
PI7AT04CEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7AT04CEX 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 PI7AT04CEX?
For technical support, including PI7AT04CEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7AT04CEX requirements.
6.How does Aetrix verify that PI7AT04CEX is sourced from the original manufacturer or authorized distributors?
All PI7AT04CEX 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 PI7AT04CEX meets industry standards.
7.What is the process for return or replacement of PI7AT04CEX?
All PI7AT04CEX units undergo pre-shipment inspection (PSI). If there is an issue with PI7AT04CEX, 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 PI7AT04CEX part is unused and in its original packaging.
Return procedure for PI7AT04CEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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