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onsemi 74LCXH245MTC
- Part No.:
- 74LCXH245MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LCXH245MTC.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,540
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Product details
Overview
74LCXH245MTC from ON Semiconductor is a low-voltage, 20-pin TSSOP bidirectional transceiver with bushold inputs and 3-STATE outputs, designed for 2.3V–3.6V bus interfacing between mixed-voltage domains. It features ±24 mA output drive at VCC = 3.0V, 7.0 ns max propagation delay at 3.3V, and 5V-tolerant control inputs (OE, T/R). It is used in FPGA-to-ASIC data path isolation and hot-swap I/O buffering.
For engineers reviewing the 74LCXH245MTC datasheet, pinout, applications, or equivalent options, key selection criteria include bushold-enabled floating-input immunity, bidirectional direction control via T/R, 3-STATE timing (tPZL/tPLZ ≤ 10.5 ns), and JEDEC MO-153 TSSOP package compatibility with high-density PCB layouts.
Technical Context
The 74LCXH245MTC implements an octal non-inverting bidirectional buffer with independent OE (output enable) and T/R (transmit/receive) control logic - enabling dynamic bus direction switching without latch-up risk. Its bushold circuitry actively maintains valid logic levels on A0–A7 and B0–B7 inputs when un-driven, eliminating external pull resistors.
It operates across 2.3V–3.6V VCC with guaranteed DC performance including VIH/VIL thresholds scaled to supply voltage, and AC specifications validated at CL = 50 pF (3.3V/2.7V) and CL = 30 pF (2.5V). ESD robustness exceeds 2000V HBM and 200V MM, supporting industrial board-level handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V - supports dual-rail 2.5V/3.3V system interconnect without level shifters |
| Max tPD | 7.0 ns at VCC = 3.3V, CL = 50 pF - enables >100 MHz bus toggle rates in synchronous designs |
| Output Drive | ±24 mA at VCC = 3.0V - drives standard TTL loads and short PCB traces without signal degradation |
| Bushold Current | ±45 µA min at VIN = 0.7V/1.7V (VCC = 2.3V) - sustains stable logic state on unterminated data lines |
| IOH/IOL Thresholds | VOH ≥ VCC − 0.2V @ IOH = −100 µA; VOL ≤ 0.55V @ IOL = 24 mA - ensures noise margin >0.7V in 3.3V systems |
| ESD Rating | Human Body Model > 2000V - meets IEC 61000-4-2 Level 2 for board assembly and field service |
| Quiescent ICC | 10 µA max - reduces standby power in battery-backed or always-on interface modules |
Pinout & Package
74LCXH245MTC 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 numbering follows standard counter-clockwise orientation from notch or dot marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low global enable - disables both A and B ports simultaneously into high-impedance state |
| 2–9 (A0–A7) | Side A I/O with Bushold | Bidirectional data port with active bushold - retains last valid logic level when floating or disconnected |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O current; must be low-inductance connection |
| 11–18 (B0–B7) | Side B I/O with Bushold | Second bidirectional port symmetric to A-side; bushold eliminates need for external biasing |
| 19 (T/R) | Transmit/Receive Control | Direction select - LOW routes B→A, HIGH routes A→B; sampled synchronously with OE |
| 20 (VCC) | Power Supply | Single 2.3V–3.6V supply - powers all logic, bushold circuitry, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant control inputs | OE and T/R accept 0–5.5V signals while VCC = 2.3V–3.6V - simplifies interface to legacy 5V controllers |
| Bushold input circuitry | Eliminates external pull-up/pull-down resistors on all 16 I/O pins - reduces BOM count and PCB area by ≥16 passives |
| Low skew outputs | tOSHL/tOSLH ≤ 1.0 ns - ensures simultaneous edge alignment across all 8 bits for timing-critical parallel buses |
| Power-down high-Z | Outputs enter high-impedance state within 10.5 ns of OE assertion - prevents bus contention during power sequencing |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD78 - withstands transient overcurrent events in noisy industrial environments |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Bridge |
|---|---|
|
Use Scenario: Isolating 3.3V FPGA I/O banks from 2.5V sensor ADCs and DACs on a shared backplane bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing real-time data flow under T/R control, with bushold preventing glitches during partial reconfiguration. Use Value: Eliminates need for discrete level shifters and pull resistors, reducing interface latency to ≤7 ns and saving ≥12 mm² PCB area per channel. |
Use Scenario: Extending limited FPGA GPIO count to drive multiple SPI peripherals and status LEDs in embedded control firmware. IC Role / Device Role / Timing Role: Octal I/O expander with 3-STATE control, enabling time-multiplexed access to shared peripheral address/data lines. Use Value: Provides deterministic 10.5 ns output disable timing for glitch-free bus arbitration and supports hot-plug detection via bushold-stable idle state. |
| Hot-Swappable Module Interconnect | Legacy Microcontroller Bus Buffer |
|
Use Scenario: Safely connecting/removing add-on modules (e.g., CAN, RS-485) to a powered main controller board without disrupting bus integrity. IC Role / Device Role / Timing Role: Fault-isolated bidirectional buffer with fast 3-STATE enable/disable, decoupling module power domains from host logic. Use Value: Prevents bus contention during insertion/removal using OE-controlled high-Z state and 2000V HBM ESD protection on all I/O pins. |
Use Scenario: Interfacing a 5V microcontroller's parallel address/data bus to a 3.3V SRAM or flash memory subsystem. IC Role / Device Role / Timing Role: Voltage-domain translator with 5V-tolerant OE/T/R inputs accepting native MCU control signals while driving 3.3V memory I/O. Use Value: Enables direct connection without external level-shifting ICs; ±24 mA drive ensures reliable setup/hold timing margins at 20 MHz bus speeds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245ABQ | No bushold; requires external pull resistors on unused I/O; 1.65V–3.6V VCC range; slightly lower drive (±24 mA at VCC = 3.3V only) | Suitable where board space allows pull resistors and bus lines are always driven; lacks floating-input immunity | Select when bushold is unnecessary and LVC family footprint compatibility is required |
| SN74AVC245DBR | Higher speed (tPD ≤ 3.2 ns at 1.8V); supports 1.2V–3.6V; no bushold; 5V-tolerant I/O (not just controls); different pinout (T/R on pin 11, OE on pin 19) | Better for ultra-low-voltage, high-speed interfaces (e.g., DDR memory training); incompatible pin mapping prevents drop-in replacement | Choose for sub-2V systems or when 5V-tolerant I/O (not just controls) is mandatory; requires PCB redesign |
Compared with 74LCXH245MTC, 74LVC245ABQ lacks bushold and requires external biasing, increasing BOM cost and layout complexity, while SN74AVC245DBR offers superior speed and wider voltage range but demands full pinout validation and layout revision due to non-compatible terminal assignment.
Availability
74LCXH245MTC is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion bridges, and hot-swappable module interconnects requiring stable component supply, long-term lifecycle support, and JEDEC MO-153 TSSOP packaging.
Supply support for 74LCXH245MTC 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 74LCXH245MTC belongs to the LCX logic family, engineered for low-voltage, high-speed bus interfacing in mixed-supply systems where bushold functionality and 5V-tolerant control simplify design and improve reliability.
FAQ
What is the operating voltage range for the 74LCXH245MTC?
The 74LCXH245MTC operates across a VCC range of 2.3V to 3.6V, with guaranteed DC and AC performance specified at 2.5V ±0.2V, 2.7V, and 3.3V ±0.3V. This range enables interoperability between 2.5V and 3.3V logic domains without external level translation. The 74LCXH245MTC also supports data retention down to 1.5V, useful during brown-out conditions.
Does the 74LCXH245MTC require external pull-up resistors on its I/O pins?
No, the 74LCXH245MTC integrates bushold circuitry on all 16 I/O pins (A0–A7 and B0–B7), which actively maintains the last valid logic state when inputs are floating or un-driven. This eliminates the need for external pull-up or pull-down resistors, reducing BOM count and PCB area. The 74LCXH245MTC's bushold current specification (±45 µA min at VCC = 2.3V) ensures reliable state retention under typical noise margins.
What is the maximum propagation delay of the 74LCXH245MTC at 3.3V?
The 74LCXH245MTC has a maximum propagation delay (tPHL/tPLH) of 7.0 ns at VCC = 3.3V ±0.3V with CL = 50 pF. This value is measured between input transition (50% point) and output crossing VOH/VOL thresholds under defined load conditions. The 74LCXH245MTC achieves this performance while maintaining CMOS-level quiescent current (≤10 µA), making it suitable for high-speed, low-power bus applications.
Is the 74LCXH245MTC pin-compatible with other LCXH245 variants?
Yes, the 74LCXH245MTC shares identical pinout and function with other LCXH245 package variants (e.g., 74LCXH245WM in SOIC, 74LCXH245MSA in SSOP), as all are defined under the same logic diagram and pin description table in the Fairchild/ON Semiconductor datasheet. The 74LCXH245MTC uses JEDEC MO-153 TSSOP (MTC20), differing only in physical dimensions and thermal characteristics - not electrical pin assignment or behavior.
What are the ESD protection ratings for the 74LCXH245MTC?
The 74LCXH245MTC provides ESD protection rated at >2000V per Human Body Model (HBM) and >200V per Machine Model (MM), as verified in the original Fairchild DS500363 datasheet. These ratings apply to all I/O pins (A0–A7, B0–B7) and control inputs (OE, T/R). The 74LCXH245MTC's robustness supports safe handling during automated assembly and field maintenance without additional protection circuitry.
74LCXH245MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCXH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LCXH245MTC FAQ
1.How can I place an order for 74LCXH245MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCXH245MTC 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 74LCXH245MTC reliable?
The price and inventory of 74LCXH245MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXH245MTC is usually 5 days.
3.What payment methods are accepted for 74LCXH245MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXH245MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCXH245MTC?
74LCXH245MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCXH245MTC 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 74LCXH245MTC?
For technical support, including 74LCXH245MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXH245MTC requirements.
6.How does Aetrix verify that 74LCXH245MTC is sourced from the original manufacturer or authorized distributors?
All 74LCXH245MTC 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 74LCXH245MTC meets industry standards.
7.What is the process for return or replacement of 74LCXH245MTC?
All 74LCXH245MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXH245MTC, 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 74LCXH245MTC part is unused and in its original packaging.
Return procedure for 74LCXH245MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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