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onsemi 74LCXZ245MSA
- Part No.:
- 74LCXZ245MSA
- Manufacturer:
- onsemi
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LCXZ245MSA.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,302
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Product details
Overview
74LCXZ245MSA from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with 3-STATE outputs, designed for bus-oriented data transfer between 2.5V/3.3V domains and 5V signal environments. It features 5V-tolerant I/O, 7.0 ns max propagation delay at VCC = 3.3V, ±24 mA output drive at 3.0V, and power-down high-impedance protection during VCC < 1.5V. It is used in mixed-voltage motherboard interconnects and hot-swap peripheral interfaces.
For engineers reviewing the 74LCXZ245MSA datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance on all I/O pins, direction control via T/R input, OE-gated 3-STATE operation, and SSOP-20 package compatibility with space-constrained PCB layouts.
Technical Context
The 74LCXZ245MSA implements non-inverting bidirectional buffering using advanced CMOS process technology, enabling simultaneous 2.3V–3.6V VCC operation while maintaining full 0–5.5V DC input/output voltage tolerance. Its internal architecture includes dual-bus I/O structures (A0–A7 and B0–B7), independent OE and T/R control logic, and patented noise/EMI reduction circuitry.
During power-up/down (VCC ≤ 1.5V), all I/O pins enter a guaranteed high-impedance state regardless of OE or T/R levels-preventing bus contention and glitching. The device supports live insertion/withdrawal when OE is pulled up to VCC, and meets JEDEC J-STD-020B Pb-free requirements in its MSA20 SSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - Enables direct interface with 2.5V and 3.3V logic systems without level shifters. |
| Input/Output Voltage Tolerance | 0V to 5.5V - Allows safe connection to 5V buses without external clamping or translation. |
| tPD Max | 7.0 ns at VCC = 3.3V - Supports >100 MHz bus clock rates in high-speed data transfer applications. |
| IOL/IOH Drive | ±24 mA at VCC = 3.0V - Drives standard TTL loads and multiple CMOS inputs without buffer fanout limitation. |
| ICC Quiescent | 225 µA max - Minimizes standby power in battery-backed or energy-sensitive embedded subsystems. |
| Power-Down Z-State | Active below VCC = 1.5V - Eliminates need for external isolation during brown-out or hot-plug sequencing. |
Pinout & Package
74LCXZ245MSA is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150 compliant, 5.3 mm wide, with 0.65 mm lead pitch and exposed pad not present. Pin numbering follows standard SSOP convention (pin 1 = OE, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE | Output Enable Input | Active-low global enable: drives both A and B ports into high-impedance when HIGH. |
| T/R | Transmit/Receive Control | Determines data flow direction: LOW = B→A, HIGH = A→B; no effect when OE = HIGH. |
| A0–A7 | Side A Bidirectional I/O | Connects to local low-voltage bus; functions as input or 3-STATE output depending on T/R and OE. |
| B0–B7 | Side B Bidirectional I/O | Connects to external 5V-tolerant bus; electrically isolated from A-side when OE = HIGH. |
| VCC | Supply Voltage | 2.3–3.6V only; powers internal logic and output drivers; must be decoupled locally. |
| GND | Ground Reference | Common return for all I/O and supply currents; requires low-inductance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | All A0–A7 and B0–B7 pins withstand 0–5.5V DC, enabling direct interfacing with legacy 5V peripherals without external protection. |
| Power-down high-Z | Guaranteed high-impedance state when VCC drops below 1.5V, preventing back-driving and bus contention during power sequencing. |
| Noise/EMI reduction | Patented internal circuitry suppresses switching noise and reduces radiated emissions, easing EMC compliance in dense PCB layouts. |
| Live insertion support | Validated for hot-plug operation when OE is tied to VCC via pull-up resistor, supporting modular backplane and docking station designs. |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD78, ensuring robustness against transient overvoltage and ground bounce events. |
Applications
| PCI Express Slot Interface | Industrial PLC Backplane |
|---|---|
Use Scenario: Isolating 3.3V FPGA configuration logic from 5V PCI Express slot detection and reset signaling. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant transceiver managing sideband signals (PERST#, WAKE#) across voltage domains. Use Value: Eliminates discrete level-shifter components and reduces BOM count while maintaining JEDEC-compliant timing margins. |
Use Scenario: Interfacing 2.5V microcontroller I/O with 5V-rated relay driver modules on modular I/O backplanes. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver synchronizing status and command data between controller and field modules. Use Value: Enables deterministic 7 ns propagation delay and ±24 mA drive to overcome long-trace capacitive loading in DIN-rail mounted enclosures. |
| Hot-Swappable Storage Module | Automotive Diagnostic Gateway |
Use Scenario: Enabling safe insertion/removal of SATA SSD modules in 3.3V host systems with 5V-compatible presence detection lines. IC Role / Device Role / Timing Role: OE-gated bidirectional buffer isolating module ID and power-good signals during hot-swap transitions. Use Value: Leverages power-down Z-state to prevent bus glitches during partial power cycling, meeting IEC 61000-4-2 ESD immunity requirements. |
Use Scenario: Bridging 3.3V CAN controller UART lines to 5V OBD-II diagnostic port logic in vehicle telematics gateways. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver relaying firmware update commands and sensor readouts between domains. Use Value: Provides 5.5V I/O tolerance and 225 µA quiescent current, supporting always-on diagnostics without compromising low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245APW | Lower VCC range (1.65–3.6V); no guaranteed power-down Z-state below 1.5V; 3.5 ns tPD at 3.3V. | Preferred where faster timing dominates over power-sequence robustness; lacks live-insertion validation. | Select when board-level power sequencing is tightly controlled and sub-5 ns delay is required. |
| SN74AVC245DBR | Wider VCC range (1.2–3.6V); supports 1.2V core logic; higher 3-STATE leakage (±10 µA vs. ±5 µA). | Suitable for ultra-low-voltage SoC interfaces; less ideal for industrial 2.5V/3.3V-only systems with strict leakage budgets. | Choose for mixed-voltage SoC designs requiring 1.2V compatibility, not for legacy LCX-family drop-in replacement. |
Compared with 74LCXZ245MSA, the 74LVC245APW offers better speed but weaker power-down safety, while the SN74AVC245DBR extends voltage flexibility downward at the cost of higher leakage and different thermal profile-neither is pin-compatible, requiring layout revision.
Availability
74LCXZ245MSA is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive diagnostic gateways, and hot-swappable storage modules requiring stable component supply, long-term lifecycle assurance, and Pb-free compliance.
Supply support for 74LCXZ245MSA 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 manufacturer acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74LCXZ245MSA belongs to the LCX low-voltage CMOS logic family, engineered specifically for mixed-voltage system interconnects where 5V tolerance, low static power, and robust power sequencing behavior are mandatory.
FAQ
What is the maximum operating temperature range for the 74LCXZ245MSA?
The 74LCXZ245MSA is rated for free-air operating temperatures from –40°C to +85°C. This range is validated across all specified VCC conditions (2.3V–3.6V) and ensures reliable 3-STATE output behavior, propagation delay stability, and I/O voltage tolerance within industrial ambient environments. Thermal derating is not required within this span.
Does the 74LCXZ245MSA support true bidirectional data flow without external direction logic?
Yes, the 74LCXZ245MSA supports true bidirectional operation using only its dedicated T/R input-no external gates or controllers are needed. When OE is active (LOW), asserting T/R = LOW routes data from B0–B7 to A0–A7, and T/R = HIGH routes from A0–A7 to B0–B7. Both directions maintain identical 7.0 ns max tPD and ±24 mA drive capability.
Can the 74LCXZ245MSA be used with a 2.5V supply voltage?
Yes, the 74LCXZ245MSA is fully specified at 2.5V supply (within its 2.3V–3.6V VCC range). At VCC = 2.5V, it delivers ≥8 mA output drive, maintains 5V-tolerant I/O, and exhibits ≤8.0 ns propagation delay. All DC electrical characteristics-including VIH/VIL thresholds and ICC-are guaranteed across this voltage band per the datasheet's Recommended Operating Conditions table.
Is the 74LCXZ245MSA pin-compatible with other 20-pin SSOP transceivers like the 74LCX245?
No, the 74LCXZ245MSA is not pin-compatible with the standard 74LCX245. While both use 20-pin SSOP packages, the 74LCXZ245MSA replaces the GND pin at position 10 with an additional VCC pin (dual-supply configuration), altering the pin map. This change supports enhanced noise immunity and power integrity but requires PCB layout revision for migration.
What is the purpose of the power-down high-impedance feature in the 74LCXZ245MSA?
The power-down high-impedance feature ensures all I/O pins (A0–A7 and B0–B7) enter a guaranteed high-Z state whenever VCC falls below 1.5V-during power-up, power-down, or brown-out events. This prevents back-driving, bus contention, and signal corruption in multi-drop systems, eliminating the need for external isolation circuitry in applications like hot-pluggable modules and modular backplanes.
74LCXZ245MSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXZ
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74LCXZ245MSA FAQ
1.How can I place an order for 74LCXZ245MSA through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXZ245MSA 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 74LCXZ245MSA reliable?
The price and inventory of 74LCXZ245MSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXZ245MSA is usually 5 days.
3.What payment methods are accepted for 74LCXZ245MSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXZ245MSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXZ245MSA?
74LCXZ245MSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXZ245MSA 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 74LCXZ245MSA?
For technical support, including 74LCXZ245MSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXZ245MSA requirements.
6.How does Aetrix verify that 74LCXZ245MSA is sourced from the original manufacturer or authorized distributors?
All 74LCXZ245MSA 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 74LCXZ245MSA meets industry standards.
7.What is the process for return or replacement of 74LCXZ245MSA?
All 74LCXZ245MSA units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXZ245MSA, 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 74LCXZ245MSA part is unused and in its original packaging.
Return procedure for 74LCXZ245MSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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