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Diodes Incorporated PI74ALVCH16245A
- Part No.:
- PI74ALVCH16245A
- Manufacturer:
- Diodes Incorporated
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
PI74ALVCH16245A.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
PI74ALVCH16245A from Pericom Semiconductor is a 16-bit bidirectional 3-state transceiver operating at 2.3V–3.6V supply, featuring independent 8-bit or unified 16-bit mode selection via DIR/OE controls, bus-hold circuitry eliminating external pull-ups, and industrial temperature range (–40°C to +85°C), deployed in backplane data routing and memory expansion interfaces.
For engineers reviewing the PI74ALVCH16245A datasheet, PI74ALVCH16245A pinout, PI74ALVCH16245A application, or PI74ALVCH16245A equivalent, key selection criteria include bidirectional direction control latency, 3-state output enable timing, bus-hold input retention behavior, and TSSOP-48 thermal derating under sustained 3.3V operation.
Technical Context
This device implements dual 8-bit or single 16-bit asynchronous bus bridging using separate DIR and OE inputs per port group. Direction control is edge-independent and level-sensitive, with simultaneous A→B or B→A flow determined solely by DIR state while OE enables/disables outputs.
Bus-hold circuitry actively maintains last valid logic level on floating inputs without external components; output ground bounce (VOLP) is specified ≤0.8V and VOHV undershoot ≤2.0V at VCC = 3.3V, TA = 25°C, supporting noise-immune signal integrity in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables direct interfacing with 3.3V LVTTL and ALVC logic families without level translation. |
| Propagation Delay | Typ. 4.4ns (OE→output) - Supports >100MHz bus toggle rates in synchronous data transfer applications. |
| Bus-Hold Current | ±54µA at VIH = 3.2V - Maintains stable logic states on un-driven data lines during hot-swap or partial system power-down. |
| Output Drive | ±24mA (IOH/IOL) - Sustains full drive strength across industrial temperature range without derating. |
| Input Hysteresis | Present on all inputs - Rejects noise up to 300mV peak-to-peak on control and data lines. |
| Operating Temp | –40°C to +85°C - Qualified for deployment in industrial control cabinets and telecom line cards. |
Pinout & Package
Package: 48-pin plastic TSSOP (A), 240-mil body width, 0.5mm lead pitch, JEDEC MO-153 compliant, thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction Control Input | Level-sensitive control: HIGH enables B→A flow; LOW enables A→B flow per 8-bit port group. |
| 1OE, 2OE | Output Enable Input (Active LOW) | Drives both A and B ports into high-impedance when HIGH; must be pulled to VCC via resistor during power-up. |
| 1A0–1A7, 2A0–2A7 | Side A I/O Terminals | Bi-directional data terminals for first/second 8-bit bus segment; internally connected to bus-hold circuitry. |
| 1B0–1B7, 2B0–2B7 | Side B I/O Terminals | Bi-directional data terminals mirroring Side A; electrically isolated but functionally paired with respective A pins. |
| VCC, GND | Power Supply Pins | Two VCC (pins 7, 22, 37) and three GND (pins 4, 19, 34) pins minimize IR drop and improve PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable 8/16-bit operation | Single DIR/OE pair per 8-bit section allows independent control of two sub-buses or synchronized 16-bit transfer. |
| Integrated bus-hold | Eliminates need for 32 external pull-up resistors on data lines, reducing BOM count and board space. |
| Low ground bounce | VOLP < 0.8V ensures signal integrity during simultaneous output switching in high-speed bus environments. |
| Industrial temperature rating | Validated operation from –40°C to +85°C supports deployment in uncontrolled ambient environments. |
| Hysteresis on all inputs | Improves noise margin on control signals (DIR/OE) in electrically noisy industrial settings. |
Applications
| Memory Expansion Interface | Backplane Data Routing |
|---|---|
|
Use Scenario: Interfacing a 32-bit microprocessor data bus to two independent 16-bit SRAM banks with shared address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional data path controller enabling time-multiplexed read/write access to separate memory segments. Use Value: Eliminates need for discrete direction logic and external bus-hold resistors, reducing gate count and layout complexity. |
Use Scenario: Isolating and translating data between two independent 16-bit parallel buses on a modular telecom backplane. IC Role / Device Role / Timing Role: Asynchronous bus bridge providing controlled direction switching and 3-state isolation during hot-swap events. Use Value: Prevents bus contention during module insertion/removal via fast OE-controlled Hi-Z assertion (<4.4ns). |
| Industrial PLC I/O Module | Test Equipment Bus Adapter |
|
Use Scenario: Buffering sensor/actuator data between a 16-bit FPGA I/O bank and field-wiring harness with long trace runs. IC Role / Device Role / Timing Role: Signal conditioner and driver amplifier maintaining logic levels over noisy industrial cabling. Use Value: Bus-hold retains last valid state during intermittent disconnection, preventing spurious control actions. |
Use Scenario: Adapting legacy 16-bit GPIB or VXI data paths to modern test controller interfaces with voltage-level mismatch. IC Role / Device Role / Timing Role: Level-shifting transceiver supporting mixed-voltage system integration without external translators. Use Value: 2.3V–3.6V VCC range accommodates both 2.5V and 3.3V controller domains within same physical interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16245A | Same pinout and DC specs; TI version lacks bus-hold circuitry - requires external pull-ups on all inputs. | Not suitable where floating inputs occur during power sequencing or partial system reset. | Select if external pull-up resistors are already present and bus-hold is unnecessary. |
| 74LVC16245ADGG | NXP part uses 1.65V–3.6V VCC range; lower drive (±24mA vs ±32mA) and no hysteresis on control inputs. | Marginally less noise-immune on DIR/OE lines in EMI-heavy environments. | Select for ultra-low-voltage systems down to 1.65V where full 3.3V drive strength is not required. |
Compared with SN74ALVCH16245A and 74LVC16245ADGG, PI74ALVCH16245A uniquely integrates bus-hold and input hysteresis while maintaining identical TSSOP-48 footprint and 3.3V timing - critical for robustness in industrial hot-swap and partial-power-down scenarios.
Availability
PI74ALVCH16245A is available at Aetrix Electronics and suitable for memory expansion interfaces, backplane data routing, industrial PLC I/O modules, and test equipment bus adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PI74ALVCH16245A 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 ICs, clock management, and signal integrity solutions before its acquisition by Diodes Incorporated in 2016.
This device belongs to Pericom's ALVCH logic family, engineered for low-voltage 3.3V bus interfacing with enhanced noise immunity and power efficiency in industrial and telecom infrastructure.
FAQ
What is the recommended pull-up resistor value for OE pins during power-up?
A minimum 4.7kΩ pull-up to VCC is recommended for OE pins to ensure reliable high-impedance state at power-on. This value balances current draw against rise-time requirements and aligns with the device's specified input leakage (±5µA max) and internal weak pull-down characteristics.
Can PI74ALVCH16245A operate reliably at 2.5V VCC?
Yes - the device is fully specified from 2.3V to 3.6V. At 2.5V, propagation delay increases to ~6.2ns (typical), output drive reduces to ±18mA, and bus-hold current drops to ±32µA, all within guaranteed limits per the datasheet's DC and AC electrical characteristics tables.
How does bus-hold functionality interact with externally driven signals?
Bus-hold circuitry activates only when input voltage falls within the hysteresis window (typically 0.8V–2.0V for 3.3V operation). When a valid HIGH or LOW signal is applied, the internal keeper is overridden without contention or increased power consumption.
Is thermal derating required for continuous operation in a 70°C ambient environment?
No - the device's maximum junction temperature (150°C) and θJA of 65°C/W (TSSOP-48, 2-layer board) allow full-rated operation at 85°C ambient. At 70°C ambient, power dissipation can reach 1.0W without exceeding Tj = 135°C, well within safe margin.
PI74ALVCH16245A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74ALVCH
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Bag
- 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
PI74ALVCH16245A FAQ
1.How can I place an order for PI74ALVCH16245A through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74ALVCH16245A 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 PI74ALVCH16245A reliable?
The price and inventory of PI74ALVCH16245A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74ALVCH16245A is usually 5 days.
3.What payment methods are accepted for PI74ALVCH16245A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74ALVCH16245A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74ALVCH16245A?
PI74ALVCH16245A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74ALVCH16245A 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 PI74ALVCH16245A?
For technical support, including PI74ALVCH16245A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74ALVCH16245A requirements.
6.How does Aetrix verify that PI74ALVCH16245A is sourced from the original manufacturer or authorized distributors?
All PI74ALVCH16245A 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 PI74ALVCH16245A meets industry standards.
7.What is the process for return or replacement of PI74ALVCH16245A?
All PI74ALVCH16245A units undergo pre-shipment inspection (PSI). If there is an issue with PI74ALVCH16245A, 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 PI74ALVCH16245A part is unused and in its original packaging.
Return procedure for PI74ALVCH16245A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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