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onsemi 74VCX163245MTDX
- Part No.:
- 74VCX163245MTDX
- Manufacturer:
- onsemi
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74VCX163245MTDX.pdf
- Description:
- IC TRANSLATOR BIDIR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
74VCX163245MTDX from ON Semiconductor is a low-voltage, 16-bit dual-supply translating transceiver with 3-STATE outputs, designed for bidirectional voltage-level translation between 1.65V–2.7V and 2.3V–3.6V busses. It features ±24mA drive at 3.0V VCCA, supports live insertion/withdrawal, and operates across –40°C to +85°C. Used in mixed-voltage notebook systems interfacing 1.8V CPUs with 3.3V peripherals.
For engineers reviewing the 74VCX163245MTDX datasheet, pinout, applications, or equivalent options, key selection criteria include dual-rail supply compatibility (VCCA/VCCB), direction control via T/R inputs, 3-STATE output enable timing, static drive capability per rail, and TSSOP-48 package mechanical fit.
Technical Context
The 74VCX163245MTDX implements true asynchronous bidirectional translation using two independent supply domains: VCCA (2.3V–3.6V) powers A-side I/O and logic, while VCCB (1.65V–2.7V) powers B-side I/O and all control pins (T/Rn, OEn). Direction is controlled per half-bus (A0–A7/B0–B7 and A8–A15/B8–B15) via separate T/R1/T/R2 inputs.
Each channel pair uses active-HIGH transmit (T/R = HIGH enables A→B) and active-LOW receive (T/R = LOW enables B→A), with shared OE inputs disabling both sides into high-impedance. The device requires VCCB ≤ VCCA and mandates pull-up of OEn to VCCB during power sequencing to ensure safe high-Z startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 2.3V to 3.6V - sets upper bus voltage domain; must be ≥ VCCB for correct translation |
| VCCB Range | 1.65V to 2.7V - sets lower bus voltage domain; supplies control pins and B-side I/O |
| IOH/IOL Drive | ±24mA @ 3.0V VCCA - ensures robust signal integrity on 3.3V buses with capacitive loads up to 30pF |
| tPHL/tPLH Max | 4.4ns @ VCCB=2.3–2.7V, VCCA=3.0–3.6V - enables >100MHz data rates in short-trace applications |
| Propagation Skew | ≤0.75ns - guarantees tight timing alignment across all 16 bits for synchronous bus interfaces |
| ESD Rating | HBM >2000V - provides system-level ESD resilience without external protection on board-level hot-swap paths |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable computing environments |
Pinout & Package
74VCX163245MTDX is packaged in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm wide, with exposed pad not electrically connected. Pin assignments follow standard bus-oriented layout: A-side signals (A0–A15) occupy left and right edges; B-side (B0–B15) are interleaved centrally; dual T/R and OE controls support split-bus operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Side A bidirectional I/O | Interface with higher-voltage bus (2.7V–3.3V); driven by VCCA; tolerate up to VCCA+0.5V |
| B0–B15 | Side B bidirectional I/O | Interface with lower-voltage bus (1.8V–2.5V); driven by VCCB; tolerate up to VCCB+0.5V |
| T/R1, T/R2 | Direction control inputs | Active-HIGH T/R1 controls A0–A7 ↔ B0–B7; T/R2 controls A8–A15 ↔ B8–B15 |
| OE1, OE2 | Output enable inputs | Active-LOW; OE1 disables A0–A7/B0–B7; OE2 disables A8–A15/B8–B15; tied to VCCB via pull-up |
| VCCA, VCCB | Power supplies | VCCA powers A-side logic and outputs; VCCB powers B-side I/O and all control inputs; VCCB ≤ VCCA required |
| GND | Ground reference | Single ground plane used for both supply domains; no separate analog/digital GND required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional voltage translation | Enables interoperability between 1.65V–2.7V and 2.3V–3.6V domains without external level shifters or direction logic |
| Live insertion support | Controlled power-up sequence (VCCB before VCCA, OEn pulled to VCCB) prevents bus contention during hot-plug events |
| Quiet Series™ noise reduction | Reduces simultaneous switching noise (SSN) via slew-rate control, lowering VOLP to 0.25V and VOHV valley to –0.6V |
| Split-bus control architecture | Dual T/R and OE pairs allow independent management of upper/lower byte lanes-critical for PCI Express sideband or DDR address/control isolation |
| Latchup immunity | Exceeds 300mA per JEDEC JESD78, ensuring robustness against transient overvoltage and ground bounce in dense PCB layouts |
Applications
| Memory Interface Translation | Notebook CPU–Peripheral Bridge |
|---|---|
Use Scenario: Translating command/address signals between a 1.8V DDR2 SDRAM controller and 3.3V legacy memory modules in embedded storage subsystems. IC Role / Device Role / Timing Role: Bidirectional translator handling A0–A15 and control lines (CAS#, RAS#, WE#) with sub-5ns propagation delay and matched skew. Use Value: Eliminates need for discrete MOSFET translators or CPLD-based solutions, reducing BOM count and layout area by 40%. | Use Scenario: Interfacing a 1.8V mobile CPU with 3.3V USB 2.0 transceivers, audio codecs, and display controllers in ultra-thin laptop designs. IC Role / Device Role / Timing Role: Voltage-level translator managing data bus (D0–D15), interrupt lines, and reset signaling with live-insertion safety. Use Value: Enables single-board integration of heterogeneous voltage domains while meeting JEDEC MO-153 footprint constraints. |
| Industrial PLC Backplane | Test Equipment Signal Routing |
Use Scenario: Isolating 2.5V FPGA I/O banks from 3.3V sensor acquisition ASICs in modular programmable logic controller racks. IC Role / Device Role / Timing Role: Dual-rail transceiver providing galvanically isolated signal translation with configurable byte-lane enables (OE1/OE2). Use Value: Supports hot-swap module replacement without system reset, verified via >2000V HBM ESD rating and controlled power sequencing. | Use Scenario: Reconfigurable signal path routing in automated test equipment where DUT I/O voltages vary between 1.8V, 2.5V, and 3.3V standards. IC Role / Device Role / Timing Role: Programmable bus translator enabling software-defined voltage domain mapping via T/R and OE control lines. Use Value: Reduces test head complexity by replacing multiple fixed-ratio translators with one reprogrammable interface IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply translating transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC16T245DGGR | Lower drive (±12mA), wider VCCA/VCCB range (1.2V–3.6V), no Quiet Series™ noise suppression | Better suited for ultra-low-voltage IoT sensor hubs; lacks live-insertion guidance and SSN mitigation | Choose when operating below 1.65V or requiring extended low-VCCB compatibility |
| TXB0108PWR | Auto-direction sensing (no T/R pin), 8-bit only, higher ICC (max 60µA vs. 20µA), no split-OE control | Ideal for simple I²C/SPI level shifting; cannot replace 16-bit split-lane control in memory or bus applications | Select only for point-to-point, low-pin-count interfaces where direction is predictable and lane granularity is unnecessary |
Compared with SN74AVC16T245DGGR and TXB0108PWR, the 74VCX163245MTDX delivers higher drive strength, deterministic direction control per byte lane, and proven quiet-switching performance-making it the preferred choice for high-speed, mixed-voltage bus bridging where timing alignment and EMI control are critical.
Availability
74VCX163245MTDX is available at Aetrix Electronics and suitable for notebook computing, industrial PLC backplanes, memory interface translation, and test equipment signal routing requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74VCX163245MTDX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and custom devices for automotive, industrial, cloud, and consumer markets.
The 74VCX163245MTDX belongs to ON Semiconductor's VCX logic family, engineered specifically for low-voltage, dual-rail voltage translation in space-constrained portable and industrial systems demanding high noise immunity and reliable hot-swap operation.
FAQ
What is the recommended power-up sequence for the 74VCX163245MTDX?
The 74VCX163245MTDX requires strict power sequencing: VCCB must be powered before VCCA, and OE pins must ramp with or ahead of VCCB. Tie OE1/OE2 to VCCB via a pull-up resistor (value determined by driver sourcing capability) to ensure high-impedance state at startup. T/R pins should be held LOW initially to configure B-side as inputs and prevent bus contention. This sequence is validated in the datasheet's "VCX163245 Translator Power Up Sequence Recommendations" section and is essential for reliable live insertion.
Does the 74VCX163245MTDX support 1.2V logic levels on either side?
No, the 74VCX163245MTDX does not support 1.2V logic. Its specified VCCB range is 1.65V to 2.7V and VCCA range is 2.3V to 3.6V. Input thresholds scale with VCCB (e.g., VIHB = 0.65 × VCCB), so at minimum VCCB = 1.65V, VIHB = 1.07V - insufficient for reliable 1.2V recognition. For 1.2V interfaces, consider alternatives like SN74AVC16T245DGGR, which supports down to 1.2V on both rails.
Can the 74VCX163245MTDX be used with VCCA = 2.5V and VCCB = 1.8V?
Yes, the 74VCX163245MTDX supports VCCA = 2.5V and VCCB = 1.8V. This combination falls within the recommended operating conditions: VCCA (2.3V–3.6V) and VCCB (1.65V–2.7V), with VCCB ≤ VCCA satisfied. DC characteristics are guaranteed for this pairing, including VIHB = 0.65 × 1.8V = 1.17V, VOHB = 1.25V at IOH = –6mA, and tPHL/tPLH ≤ 5.8ns. Ensure all control inputs (T/R, OE) are referenced to VCCB and remain within 0V to VCCB.
What is the function of the NC pins on the 74VCX163245MTDX TSSOP package?
The NC (No Connect) pins on the 74VCX163245MTDX TSSOP package-located at positions A2, A3, B0, B1, C0, C1, H0, H1, J0, and J1 per the pin assignment diagram-are internally unconnected and must remain floating or grounded per PCB design best practices. They serve no electrical function and are reserved for future product variants or package compatibility. Do not route signals or apply voltage to NC pins; leaving them unconnected poses no risk to device operation or reliability.
How does the Quiet Series™ technology in the 74VCX163245MTDX reduce EMI?
The Quiet Series™ technology in the 74VCX163245MTDX reduces EMI through proprietary output stage slew-rate control and internal noise filtering, limiting dynamic output voltage peaks (VOLP) to 0.25V and valleys (VOLV) to –0.6V under 30pF load. This suppresses simultaneous switching noise (SSN) that causes ground bounce and radiated emissions. Measured AC characteristics confirm reduced overshoot/undershoot versus standard VCX devices, enabling cleaner signal integrity in high-density layouts without added ferrite beads or RC snubbers.
74VCX163245MTDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VCX
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA; 18mA, 18mA
- Voltage - Supply:
- 1.65V ~ 2.7V, 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
74VCX163245MTDX FAQ
1.How can I place an order for 74VCX163245MTDX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VCX163245MTDX 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 74VCX163245MTDX reliable?
The price and inventory of 74VCX163245MTDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX163245MTDX is usually 5 days.
3.What payment methods are accepted for 74VCX163245MTDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX163245MTDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VCX163245MTDX?
74VCX163245MTDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VCX163245MTDX 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 74VCX163245MTDX?
For technical support, including 74VCX163245MTDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX163245MTDX requirements.
6.How does Aetrix verify that 74VCX163245MTDX is sourced from the original manufacturer or authorized distributors?
All 74VCX163245MTDX 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 74VCX163245MTDX meets industry standards.
7.What is the process for return or replacement of 74VCX163245MTDX?
All 74VCX163245MTDX units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX163245MTDX, 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 74VCX163245MTDX part is unused and in its original packaging.
Return procedure for 74VCX163245MTDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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