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onsemi 74LCXZ245SJ
- Part No.:
- 74LCXZ245SJ
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LCXZ245SJ.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
74LCXZ245SJ from Fairchild Semiconductor is a low-voltage bidirectional transceiver with 5V-tolerant inputs and outputs, designed for bus-oriented applications between 2.5V/3.3V logic domains and 5V signal environments. It features 8 non-inverting channels, 3-STATE outputs, direction control via T/R input, output enable via OE, and operates at VCC = 2.3–3.6V with 7.0 ns max propagation delay (3.3V).
For engineers reviewing the 74LCXZ245SJ datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance on all I/Os, power-down high-impedance behavior below 1.5V VCC, ±24 mA drive strength at 3.0V, ESD robustness (2000V HBM), and compatibility with live insertion in hot-swap systems.
Technical Context
The 74LCXZ245SJ implements dual-bus bidirectional data flow controlled by separate OE (output enable) and T/R (transmit/receive) inputs, enabling flexible bus arbitration in mixed-voltage systems. Its CMOS design ensures rail-to-rail 5V-tolerant I/O operation while maintaining sub-10 ns propagation delay and low ICC (≤225 µA quiescent current) across 2.3–3.6V supply range.
During power-up/down (VCC ≤1.5V), all I/Os enter a guaranteed high-impedance state independent of OE/T/R control, preventing bus contention. The device integrates patented noise/EMI reduction circuitry and meets latch-up immunity >500 mA per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V to 3.6V - supports both 2.5V and 3.3V system rails without level shifters |
| Propagation Delay | 7.0 ns max (VCC = 3.3V, CL = 50 pF) - enables high-speed bus transfer up to ~100 MHz effective throughput |
| I/O Voltage Tolerance | 0V to 5.5V - allows direct connection to 5V buses without external protection or translation |
| Output Drive | ±24 mA (VCC = 3.0V) - drives standard TTL loads and multiple CMOS inputs under worst-case conditions |
| Power-Down Behavior | High-impedance I/Os when VCC ≤1.5V - eliminates bus glitches during hot-plug or brownout events |
| ESD Rating | 2000V HBM - exceeds standard industrial requirements for handling and board assembly |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature operation |
Pinout & Package
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Number M20D).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low global control: disables both A and B ports into high-impedance state when HIGH |
| 2 (A0) | Side A I/O | Bidirectional terminal - data flows A→B when T/R = HIGH, B→A when T/R = LOW |
| 3 (A1) | Side A I/O | Same bidirectional function as A0; all A0–A7 share identical electrical characteristics |
| 4 (A2) | Side A I/O | Supports 8-bit parallel bus interface with matched timing across all channels |
| 5 (A3) | Side A I/O | No internal pull-up/pull-down; requires external biasing if unused during 3-STATE |
| 6 (A4) | Side A I/O | 5V-tolerant regardless of VCC level - safe for mixed-voltage backplane connections |
| 7 (A5) | Side A I/O | Capacitance: CI/O = 8 pF - minimizes signal distortion on high-speed traces |
| 8 (A6) | Side A I/O | Driven by same internal buffer architecture as A0–A5; no skew beyond 1.0 ns (tOSLH/tOSHL) |
| 9 (A7) | Side A I/O | Final channel of 8-bit data path; shares common OE and T/R control with all A-side pins |
| 10 (GND) | Ground Reference | Single ground pin for entire device; layout must minimize impedance to reduce switching noise |
| 11 (B7) | Side B I/O | Bidirectional counterpart to A7; direction determined solely by T/R input state |
| 12 (B6) | Side B I/O | Matches A6 in timing, drive strength, and voltage tolerance - enables symmetrical bus design |
| 13 (B5) | Side B I/O | IOZ leakage ≤5.0 µA (VCC = 2.3–3.6V) - ensures stable high-Z state during disable |
| 14 (B4) | Side B I/O | Supports live insertion: high-Z on power ramp prevents back-driving of powered subsystems |
| 15 (B3) | Side B I/O | VIH = 2.0V min (VCC = 2.7–3.6V) - compatible with 3.3V LVTTL and LVCMOS logic thresholds |
| 16 (B2) | Side B I/O | VIL = 0.8V max (VCC = 2.7–3.6V) - rejects noise on shared bus lines |
| 17 (B1) | Side B I/O | Same dynamic peak VOL (VOLP = 0.8V typ) as A-side - maintains signal integrity across full bus width |
| 18 (B0) | Side B I/O | First channel of B-side; electrically identical to B1–B7 |
| 19 (T/R) | Transmit/Receive Input | Active-HIGH control: sets data flow direction (A→B when HIGH, B→A when LOW) |
| 20 (VCC) | Supply Voltage | Accepts 2.3–3.6V only; 5V on VCC violates Absolute Maximum Rating and may damage device |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/Os | All 16 I/O pins operate safely with 0–5.5V signals regardless of VCC (2.3–3.6V), eliminating external clamping diodes |
| Power-down high-Z | Guaranteed high-impedance state when VCC ≤1.5V - prevents bus conflicts during power sequencing or failure |
| Live insertion support | OE tied to VCC via pull-up resistor ensures safe hot-plug operation without external sequencers |
| Noise/EMI reduction | Patented circuitry reduces simultaneous switching noise (SSN), lowering radiated emissions in dense PCB layouts |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD78 - withstands transient overcurrent events in industrial environments |
Applications
| Industrial Backplane Interface | Hot-Swappable Module Interconnect |
|---|---|
Use Scenario: Connecting 3.3V FPGA-based control modules to legacy 5V sensor/data acquisition backplanes. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus isolator between mismatched logic families. Use Value: Eliminates need for discrete level-shifter arrays while maintaining <7 ns propagation delay and 5V fault tolerance. | Use Scenario: Enabling field-replaceable compute cards in telecom line cards where modules are inserted/removed under power. IC Role / Device Role / Timing Role: Bus transceiver with guaranteed high-Z on power ramp to prevent back-driving of live backplane. Use Value: Supports JEDEC-compliant hot-swap protocols without auxiliary power sequencing circuitry. |
| Low-Power Embedded Data Bridge | Mixed-Voltage Memory Expansion |
Use Scenario: Bridging 2.5V microcontroller peripherals (e.g., UART, SPI) to 5V display or audio subsystems in portable devices. IC Role / Device Role / Timing Role: Low-quiescent-current (225 µA) bidirectional data conduit with minimal standby power draw. Use Value: Extends battery life in always-on interfaces while preserving signal integrity across voltage domains. | Use Scenario: Expanding external SRAM or Flash memory space on 3.3V SoC designs requiring 5V-tolerant address/data buses. IC Role / Device Role / Timing Role: 8-bit bidirectional bus buffer with ±24 mA drive to meet memory access timing and loading requirements. Use Value: Enables direct connection to 5V memory parts without additional bus buffers or level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245A | Lower drive (±24 mA at 3.3V but only ±12 mA at 2.7V); no guaranteed power-down high-Z below 1.5V VCC | Lacks inherent hot-swap safety; requires external power sequencing for reliable live insertion | Select when cost sensitivity outweighs need for guaranteed power-ramp isolation |
| SN74AVC245 | Wider VCC range (1.2–3.6V); higher speed (tPD = 3.2 ns typ at 3.3V); no 5V tolerance - requires external clamping | Not suitable for direct 5V bus interfacing; limited to 3.3V-only systems with strict noise control | Select for ultra-low-voltage, high-speed point-to-point links where 5V tolerance is unnecessary |
Compared with 74LVC245A and SN74AVC245, the 74LCXZ245SJ uniquely combines 5V I/O tolerance, guaranteed power-down high-Z, and live-insertion capability in a single 20-pin SOP package - making it optimal for industrial backplane and hot-swap applications where bus integrity across power transitions is critical.
Availability
74LCXZ245SJ is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable module interconnects, low-power embedded data bridges, and mixed-voltage memory expansion requiring stable component supply and long-term lifecycle support.
Supply support for 74LCXZ245SJ 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 semiconductor company specializing in power management, analog, and logic ICs before its acquisition by ON Semiconductor in 2016.
The 74LCXZ245SJ belongs to the LCX family of low-voltage, high-speed CMOS logic devices engineered specifically for mixed-voltage system interfacing with robust 5V tolerance and power-rail transition safety.
FAQ
What is the maximum operating voltage on the I/O pins of the 74LCXZ245SJ?
The 74LCXZ245SJ supports DC input/output voltages from 0V to 5.5V on all I/O pins (A0–A7, B0–B7), independent of VCC level. This 5V tolerance allows direct interfacing with 5V buses while operating from a 2.3–3.6V supply. Exceeding 5.5V on any I/O pin violates Absolute Maximum Ratings and risks permanent damage to the 74LCXZ245SJ.
Does the 74LCXZ245SJ enter high-impedance state automatically during power-up?
Yes - the 74LCXZ245SJ guarantees high-impedance outputs when VCC is between 0V and 1.5V, regardless of OE or T/R input states. This intrinsic power-rail tracking behavior prevents bus contention during power-up/down sequences and is a defining feature of the 74LCXZ245SJ not found in standard LVC or AVC variants.
Can the 74LCXZ245SJ be used for hot-swap applications without external circuitry?
Yes, the 74LCXZ245SJ supports live insertion/withdrawal when OE is tied to VCC through a pull-up resistor (minimum value determined by driver capability). Its guaranteed high-Z state below 1.5V VCC and 5V-tolerant I/Os eliminate the need for auxiliary power sequencing or bus isolation logic in compliant hot-swap designs using the 74LCXZ245SJ.
What is the output drive capability of the 74LCXZ245SJ at 2.7V VCC?
At VCC = 2.7V, the 74LCXZ245SJ delivers ±12 mA output current (IOL/IOH) per pin under specified conditions. This is confirmed in the Recommended Operating Conditions table and ensures reliable driving of standard TTL loads and multiple CMOS inputs even at the lower end of its supply range - a key specification distinguishing the 74LCXZ245SJ from narrower-range alternatives.
Is the 74LCXZ245SJ pin-compatible with other 20-pin transceivers like the 74LCX245?
No - the 74LCXZ245SJ is not pin-compatible with the non-Z variant 74LCX245. While both use 20-pin packages, the 74LCXZ245SJ replaces the GND pin at position 10 with an active OE input, altering the pin mapping. Always verify pin functions against the official 74LCXZ245SJ connection diagram - substituting the 74LCXZ245SJ into a 74LCX245 layout will cause functional failure.
74LCXZ245SJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXZ
- Package/Case:
- 20-SOIC (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-SOP
74LCXZ245SJ FAQ
1.How can I place an order for 74LCXZ245SJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXZ245SJ 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 74LCXZ245SJ reliable?
The price and inventory of 74LCXZ245SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXZ245SJ is usually 5 days.
3.What payment methods are accepted for 74LCXZ245SJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXZ245SJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXZ245SJ?
74LCXZ245SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXZ245SJ 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 74LCXZ245SJ?
For technical support, including 74LCXZ245SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXZ245SJ requirements.
6.How does Aetrix verify that 74LCXZ245SJ is sourced from the original manufacturer or authorized distributors?
All 74LCXZ245SJ 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 74LCXZ245SJ meets industry standards.
7.What is the process for return or replacement of 74LCXZ245SJ?
All 74LCXZ245SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXZ245SJ, 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 74LCXZ245SJ part is unused and in its original packaging.
Return procedure for 74LCXZ245SJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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