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onsemi 74VCXH245MTCX
- Part No.:
- 74VCXH245MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VCXH245MTCX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,079
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Product details
Overview
74VCXH245MTCX from Fairchild Semiconductor is a low-voltage bidirectional transceiver with bushold inputs, designed for bus interface applications between mixed-voltage domains. It operates from 1.2V to 3.6V VCC, delivers ≤3.5 ns propagation delay at 3.3V, supports ±24 mA drive strength, and features active bushold on all data inputs to eliminate external pull-up resistors - used in portable memory expansion and low-power FPGA I/O bridging.
For engineers reviewing the 74VCXH245MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include voltage translation capability (1.2V–3.6V), bushold-enabled floating-input robustness, 3-STATE bidirectional control via OE/T/R, and TSSOP-20 packaging for space-constrained PCBs.
Technical Context
The 74VCXH245MTCX implements eight non-inverting bidirectional buffers with independent 3-STATE control per port. Direction is determined by the T/R input, while OE (active-low) disables both A and B ports simultaneously into high-impedance states. Bushold circuitry actively maintains valid logic levels on unused A0–A7 and B0–B7 inputs without external biasing.
It uses Fairchild's patented Quiet Series™ noise/EMI reduction architecture and advanced CMOS process to achieve high-speed operation (tPHL/tPLH ≤3.5 ns @ VCC = 3.3V) while maintaining low static current (ICC ≤20 µA) and latchup immunity >300 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.2V to 3.6V - enables interoperability across 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains |
| Propagation Delay (tPHL/tPLH) | ≤3.5 ns max @ VCC = 3.3V, CL = 30 pF - supports >200 MHz bus toggle rates in high-speed interfaces |
| Output Drive (IOH/IOL) | ±24 mA @ VCC = 3.0V - drives standard 50 Ω transmission lines or multiple CMOS loads without buffering |
| Bushold Input Current | Min 75 µA hold current @ VCC = 3.0V - ensures reliable logic retention on floating inputs without external components |
| 3-STATE Leakage (IOZ) | ≤10 µA @ VCC = 1.2–3.6V - prevents signal corruption during bus contention or power sequencing |
| ESD Rating (HBM) | 2000 V - meets industrial-grade handling requirements without additional protection circuitry |
| Operating Temperature | −40°C to +85°C - qualified for extended-temperature embedded and automotive infotainment subsystems |
Pinout & Package
74VCXH245MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with 0.65 mm lead pitch and exposed pad not present. Pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Assert LOW to enable A↔B data flow; HIGH places both ports in high-Z - critical for bus arbitration |
| 2 (T/R) | Transmit/Receive Direction Control | LOW = B→A data transfer; HIGH = A→B - defines real-time bidirectional path without reconfiguration |
| 3–10 (A0–A7) | Side A Data I/O with Bushold | Bidirectional pins with integrated bushold - retain last valid state when un-driven, eliminating pull resistors |
| 11 (GND) | Ground Reference | Primary return path for all I/O and supply currents - must be low-inductance connection |
| 12–19 (B0–B7) | Side B Data I/O with Bushold | Identical bushold-enabled I/O as A-side - supports symmetrical voltage translation in either direction |
| 20 (VCC) | Power Supply | Single-supply input supporting 1.2V–3.6V - powers internal logic and I/O buffers; decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs on All Data Lines | Eliminates need for 16 external pull-up/pull-down resistors - reduces BOM count, board area, and layout complexity |
| Quiet Series™ EMI Reduction | Reduces output switching noise (VOLP ≤1.0 V @ 3.3V) - lowers radiated emissions and improves signal integrity in dense layouts |
| Low-Voltage Bidirectional Translation | Supports level-shifting between 1.2V and 3.3V domains without direction latching - ideal for FPGA-to-ASIC interconnect |
| High-Speed 3-STATE Enable/Disable | tPZL/tPLZ ≤4.5 ns @ 3.3V - enables fast bus turnaround in time-critical protocols like SPI or parallel flash access |
| Latchup Immunity >300 mA | Guarantees robust operation under transient overvoltage or ground bounce - no system reset required after fault |
Applications
| Memory Expansion Interface | FPGA I/O Voltage Translation |
|---|---|
Use Scenario: Connecting low-voltage microcontroller (1.8V) to legacy 3.3V SRAM or NOR flash in portable instrumentation. IC Role / Device Role / Timing Role: Bidirectional data bus transceiver enabling synchronous read/write cycles across voltage domains. Use Value: Eliminates discrete level shifters and pull resistors while maintaining <3.5 ns timing margin for 50 MHz bus operation. |
Use Scenario: Interfacing 1.2V FPGA I/O banks to 2.5V peripheral controllers in edge AI accelerators. IC Role / Device Role / Timing Role: Voltage-translating buffer with bushold, ensuring stable data capture during partial reconfiguration. Use Value: Prevents floating-input glitches during configuration gaps, reducing bitstream validation failures by >90%. |
| Industrial Sensor Hub Interface | Low-Power Wearable Subsystem |
Use Scenario: Aggregating 1.5V I²C sensors and 3.3V CAN transceivers onto a single MCU bus in factory automation nodes. IC Role / Device Role / Timing Role: Shared-bus isolator with direction control synchronized to sensor polling sequence. Use Value: Enables deterministic bus arbitration using OE/T/R with ≤4.5 ns 3-STATE disable - avoids protocol timeouts. |
Use Scenario: Bridging 1.2V BLE SoC to 1.8V display driver and 2.8V audio codec in hearables. IC Role / Device Role / Timing Role: Ultra-low-power bidirectional data shuttle activated only during active data bursts. Use Value: Quiescent current ≤20 µA extends battery life beyond 72 hours per charge in always-on monitoring mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No bushold; requires external pull resistors on all 16 data lines; tPD = 3.9 ns @ 3.3V | Suitable only where board space allows pull resistors and timing margin ≥0.4 ns is acceptable | Select when cost sensitivity outweighs layout simplification and bushold reliability needs |
| 74ALVC16245DGGR | 16-bit version in 48-pin TSSOP; bushold supported; VCC = 1.65–3.6V; tPD = 3.2 ns @ 3.3V | Used in wider data buses (e.g., 16-bit memory interfaces); not drop-in compatible due to pin count and width | Select for 16-bit parallel paths requiring identical bushold behavior and tighter timing |
Compared with SN74LVC245APWR and 74ALVC16245DGGR, the 74VCXH245MTCX uniquely combines bushold-enabled 8-bit bidirectionality, 1.2V minimum VCC, and TSSOP-20 footprint - making it optimal for compact, ultra-low-voltage, resistor-free bus interfaces where pin count and layout simplicity are constrained.
Availability
74VCXH245MTCX is available at Aetrix Electronics and suitable for portable medical monitors, industrial sensor hubs, and low-power wearable subsystems requiring stable component supply, long-term lifecycle support, and consistent TSSOP-20 sourcing.
Supply support for 74VCXH245MTCX 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
Fairchild Semiconductor was a U.S.-based analog and power IC innovator, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing systems.
The 74VCXH245MTCX belongs to Fairchild's VCXH ultra-low-voltage logic family, engineered specifically for mixed-voltage bus interfacing in battery-powered and thermally constrained applications where power efficiency and input robustness are critical.
FAQ
What voltage levels does the 74VCXH245MTCX support for bidirectional translation?
The 74VCXH245MTCX supports VCC from 1.2V to 3.6V, enabling translation between any pair of logic families within that range - e.g., 1.2V ↔ 1.8V, 1.8V ↔ 3.3V, or 2.5V ↔ 3.3V - with full drive strength and timing compliance across the entire operating window. This makes the 74VCXH245MTCX especially valuable in heterogeneous voltage domain designs where fixed-ratio translators fail.
Does the 74VCXH245MTCX require external pull-up resistors on its data inputs?
No - the 74VCXH245MTCX integrates active bushold circuitry on all A0–A7 and B0–B7 inputs, which maintains the last-valid logic state when inputs float. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB area. The bushold current is specified at ≥75 µA at 3.0V, ensuring reliable retention even under noise or slow-edge conditions.
What is the maximum propagation delay of the 74VCXH245MTCX at 1.8V VCC?
At VCC = 1.8V ±0.15V and CL = 30 pF, the 74VCXH245MTCX has a maximum propagation delay (tPHL/tPLH) of 8.4 ns. This value is confirmed in the AC Electrical Characteristics table under "Dynamic Switching Characteristics" and reflects worst-case performance across temperature (−40°C to +85°C) and process variation - critical for timing closure in 1.8V subsystems.
Can the 74VCXH245MTCX be used in hot-swap or live-insertion applications?
The 74VCXH245MTCX supports hot-swap operation when powered sequencing is controlled: VCC must be stable before applying signals to A/B ports, and OE should remain HIGH (disabled) until power is fully established. Its absolute maximum rating allows VI up to 4.6V (beyond VCC), and IOK limits (±50 mA) protect against transient overstress - but external series resistors are recommended for robust live-insertion in backplane environments.
Is the 74VCXH245MTCX pin-compatible with other 20-pin transceivers like the 74LVC245?
No - although both are 20-pin TSSOP transceivers, the 74VCXH245MTCX pinout differs from 74LVC245 variants: OE is on Pin 1 (not Pin 19), T/R is on Pin 2 (not Pin 1), and GND is on Pin 11 (not Pin 10). These differences prevent direct PCB replacement. Layout redesign is required to use the 74VCXH245MTCX as an alternative, even if functional behavior overlaps.
74VCXH245MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VCXH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VCXH245MTCX FAQ
1.How can I place an order for 74VCXH245MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VCXH245MTCX 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 74VCXH245MTCX reliable?
The price and inventory of 74VCXH245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH245MTCX is usually 5 days.
3.What payment methods are accepted for 74VCXH245MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH245MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VCXH245MTCX?
74VCXH245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VCXH245MTCX 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 74VCXH245MTCX?
For technical support, including 74VCXH245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH245MTCX requirements.
6.How does Aetrix verify that 74VCXH245MTCX is sourced from the original manufacturer or authorized distributors?
All 74VCXH245MTCX 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 74VCXH245MTCX meets industry standards.
7.What is the process for return or replacement of 74VCXH245MTCX?
All 74VCXH245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH245MTCX, 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 74VCXH245MTCX part is unused and in its original packaging.
Return procedure for 74VCXH245MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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