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Diodes Incorporated PI3B16248B
- Part No.:
- PI3B16248B
- Manufacturer:
- Diodes Incorporated
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 80-FSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI3B16248B.pdf
- Description:
- IC MUX/DEMUX 12 X 1:2 80BQSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,053
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Product details
Overview
PI3B16248B from Pericom Semiconductor is a 3.3V, 24-bit to 48-bit bidirectional analog Mux/DeMux bus switch with near-zero propagation delay (250 ps), 5 Ω typical on-resistance at 3.3V, and make-before-break switching action-used in high-speed memory DIMM data path routing between CPU and dual-channel 128M modules.
For engineers reviewing the PI3B16248B datasheet, PI3B16248B pinout, PI3B16248B application, or PI3B16248B equivalent, key selection criteria include its 4.5 ns max enable time, 500 Ω pulldown on unconnected B ports, industrial temperature range (–40°C to +85°C), and compatibility with 3.0V–3.6V VCC operation in DDR SDRAM subsystems.
Technical Context
The PI3B16248B implements a dual-rail CMOS analog switch architecture with two independent 24-bit channels, each selectable between two 48-bit output banks (1B and 2B) via S1/S2 control logic. It operates without internal level-shifting circuitry and supports rail-to-rail logic inputs up to +5.5V regardless of VCC.
Its low RON (5 Ω typ.) and minimal parasitic capacitance (CIN = 3.5 pF, CON = 32 pF) ensure signal integrity for 100 MHz DDR data buses. The device uses no internal latching or buffering-switching is purely resistive and transparent, with timing governed solely by external RC loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0 V to 3.6 V - defines strict 3.3V I/O domain compliance; incompatible with 5V-only or 2.5V systems |
| RON (typ) | 5 Ω at VCC = 3.0 V, ION = 24 mA - enables <100 mV voltage drop at 20 mA per line, critical for low-noise DIMM data paths |
| tPLH | 250 ps (CL = 50 pF, RL = 500 Ω) - contributes negligible delay vs. driver/fanout-induced skew in 100 MHz DDR timing budgets |
| tEN (max) | 4.5 ns - ensures fast channel reconfiguration during memory bank switching without violating setup/hold windows |
| Make-before-break | 0–2 ns guaranteed - prevents momentary open-circuit glitches during port transition in hot-swap-capable DIMM slots |
| Input Pulldown | 500 Ω on unconnected B ports - maintains defined logic state during initialization or fault conditions, avoiding floating inputs |
| Operating Temp | –40°C to +85°C - validated for industrial-grade server memory modules with sustained thermal cycling |
Pinout & Package
Package: 80-pin BQSOP (Body: 20.4 mm × 6.2 mm × 2.0 mm, lead pitch: 0.5 mm, Pb-free & Green compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A24 | Input/Output Data Bus (Channel A) | 24 bidirectional analog I/O lines connected directly to CPU-side memory controller traces |
| 1B1–1B24, 2B1–2B24 | Output Data Bus Banks (Bank 1 & Bank 2) | Two independent 24-bit output banks routed to separate 128M DIMM modules; each pair shares one A line |
| S1, S2 | Logic Select Inputs | Binary-encoded control pins determining whether A lines route to 1B (S2=0,S1=0), 2B (S2=1,S1=1), or high-Z (S2≠S1) |
| GND, VCC | Power Supply Terminals | Single 3.3V supply with dedicated ground plane pins distributed across package corners for low-impedance return paths |
Key Features
| Feature | Design Value |
|---|---|
| Near-zero propagation delay | 250 ps tPLH enables sub-cycle timing margin preservation in 100 MHz DDR memory interfaces |
| 5 Ω typical RON | Minimizes IR drop and signal attenuation across 24 parallel data lines under 24 mA load per switch |
| 500 Ω B-port pulldown | Guarantees known logic state on unused DIMM-side outputs, eliminating need for external bias resistors |
| Rail-to-rail logic inputs | Supports 0–5.5 V control signaling independent of VCC, simplifying interface with mixed-voltage system controllers |
| Make-before-break switching | Prevents data corruption during dynamic DIMM bank selection by ensuring continuous connectivity for ≤2 ns |
Applications
| DDR SDRAM Memory Switching | Dual-Channel DIMM Multiplexing |
|---|---|
Use Scenario: Routing 72-bit data/ECC paths between CPU memory controller and two physically separate 128M DIMM modules sharing same address/command bus. IC Role / Device Role / Timing Role: Bidirectional analog mux acting as transparent, low-latency data path selector with sub-nanosecond timing contribution. Use Value: Enables cost-effective dual-DIMM support without doubling memory controller pins; preserves signal integrity at 100 MHz due to 5 Ω RON and 32 pF CON. | Use Scenario: Hot-plug-capable server memory expansion where one DIMM slot must be dynamically isolated while another remains active. IC Role / Device Role / Timing Role: Fault-tolerant bus switch providing glitch-free port reconfiguration via make-before-break action during live insertion/removal. Use Value: Eliminates need for complex sequencing logic or external hold-off circuits-switching completes within 2 ns without data loss or metastability. |
| High-Speed Logic Bus Isolation | Industrial Embedded Memory Expansion |
Use Scenario: Isolating test equipment I/O from production memory subsystems during functional validation of DDR timing margins. IC Role / Device Role / Timing Role: Low-capacitance analog gate enabling clean break-before-make isolation with <32 pF output loading. Use Value: Prevents back-driving and crosstalk during test mode; 500 Ω pulldown ensures safe default state when disconnected. | Use Scenario: Upgrading legacy industrial controllers with additional memory capacity using standardized DIMM form factor. IC Role / Device Role / Timing Role: Voltage-domain translator and bus extender supporting 3.3V controller interfacing to off-the-shelf 128M modules. Use Value: Operates reliably over –40°C to +85°C ambient without derating; Pb-free BQSOP package meets IPC-J-STD-020 moisture sensitivity Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PI3B3244B | 12-bit, single 4:1 mux; lower channel count, identical RON/tPLH specs | Suitable only for narrow-bus or test-point isolation-not scalable to 24-bit DIMM routing | Select when footprint and channel density are constrained but full 24-bit bandwidth is unnecessary |
| SN74CBT3244PWR | TI part: 8-bit, 2.5V–3.6V VCC, 6 Ω RON, no built-in pulldown | Lacks 500 Ω B-port termination; requires external biasing for floating-state safety | Choose only if existing design already includes pull-down networks and channel count permits stacking |
Compared with PI3B16248B, PI3B3244B offers reduced integration for space-constrained test fixtures, while SN74CBT3244PWR demands added board-level design effort to replicate the integrated pulldown and 24-bit scalability-neither matches the native DIMM-switching optimization of the PI3B16248B.
Availability
PI3B16248B is available at Aetrix Electronics and suitable for DDR SDRAM memory switching, dual-channel DIMM multiplexing, and industrial embedded memory expansion requiring stable component supply across extended product lifecycles.
Supply support for PI3B16248B 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 was a fabless provider specializing in high-speed interface and timing solutions before its acquisition by Diodes Incorporated in 2016; legacy products maintain full technical documentation and long-term support.
The PI3B16248B belongs to Pericom's NanoSwitch™ family-designed specifically for low-latency, low-RON analog bus switching in DDR memory subsystems and high-speed logic isolation applications.
FAQ
What is the maximum data rate supported by PI3B16248B?
The PI3B16248B does not specify a maximum data rate in Mbps/Gbps, but its 250 ps propagation delay and 5 Ω RON support clean signal transmission up to 100 MHz clock domains-validated in 128M DIMM applications with 72-bit DDR data buses. System-level bandwidth depends on PCB layout, driver strength, and load capacitance.
Can PI3B16248B operate with 2.5V or 5V supply?
No. PI3B16248B is strictly rated for 3.0V to 3.6V VCC operation. While its logic inputs tolerate up to +5.5V, the internal switch core requires 3.3V nominal supply to achieve specified RON (5 Ω) and timing (250 ps tPLH). Operation outside this range risks parametric failure or undefined switching behavior.
Does PI3B16248B require external pull-up or pull-down resistors?
Only on control pins (S1/S2) if driven by open-drain sources; otherwise, none required. The device integrates 500 Ω pulldown resistors on all B-port terminals (1B1–1B24, 2B1–2B24), eliminating external biasing for floating-state safety-a key differentiator versus generic bus switches.
Is PI3B16248B pin-compatible with earlier Pericom bus switches?
No. PI3B16248B uses an 80-pin BQSOP package with unique 24-input/48-output pin mapping and dual-select logic (S1/S2). It is not pin-compatible with PI3B3244B (20-pin TSSOP) or PI3B3126 (14-pin SOIC); migration requires PCB redesign and signal routing verification.
PI3B16248B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 80-FSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 12 x 1:2
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-BQSOP
PI3B16248B FAQ
1.How can I place an order for PI3B16248B through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3B16248B 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 PI3B16248B reliable?
The price and inventory of PI3B16248B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3B16248B is usually 5 days.
3.What payment methods are accepted for PI3B16248B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3B16248B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3B16248B?
PI3B16248B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3B16248B 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 PI3B16248B?
For technical support, including PI3B16248B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3B16248B requirements.
6.How does Aetrix verify that PI3B16248B is sourced from the original manufacturer or authorized distributors?
All PI3B16248B 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 PI3B16248B meets industry standards.
7.What is the process for return or replacement of PI3B16248B?
All PI3B16248B units undergo pre-shipment inspection (PSI). If there is an issue with PI3B16248B, 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 PI3B16248B part is unused and in its original packaging.
Return procedure for PI3B16248B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PI3B16248B Tags
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