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Toshiba Semiconductor and Storage 74LCX245FT
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- Part No.:
- 74LCX245FT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LCX245FT.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,136
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Product details
Overview
74LCX245FT from Toshiba Electronic Devices & Storage Corporation is a high-performance CMOS octal bus transceiver designed for bidirectional 3.3-V/5-V level translation in mixed-voltage systems. It features 20-pin TSSOP packaging, 7.0 ns max propagation delay at VCC = 3.3 V, ±24 mA output drive, and 5-V tolerant I/Os-enabling reliable interface between legacy 5-V logic and modern low-voltage microcontrollers or FPGAs.
For engineers reviewing the 74LCX245FT datasheet, 74LCX245FT pinout, 74LCX245FT application, or 74LCX245FT equivalent, this device supports critical design tasks including voltage-level bridging in industrial I/O modules, memory expansion interfaces, and FPGA-to-peripheral communication where low-power, high-speed, and robust ESD protection are required.
Technical Context
The 74LCX245FT implements a dual-bus architecture with DIR-controlled data direction and OE-gated 3-state outputs, enabling flexible bidirectional data flow control in system interconnects. Its input and output stages are independently rated for 0–5.5 V operation while powered from 1.65–3.6 V, allowing safe interfacing without external level-shifting components.
All inputs include diode-based ESD protection, and power-down leakage is limited to ±5.0 µA across the full supply range. The device guarantees AC timing under -40°C to +85°C with tPZL/tPHZ ≤ 8.5 ns (VCC = 3.3 V), supporting stable operation in thermally demanding embedded environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into 3.3-V core logic domains without regulator overhead. |
| Propagation Delay | 7.0 ns max (VCC = 3.0–3.6 V) - Supports >100 MHz bus clocking in synchronous data transfers. |
| Output Drive | ±24 mA (min, VCC = 3.0 V) - Drives standard TTL loads and longer PCB traces without signal degradation. |
| I/O Voltage Tolerance | 0–5.5 V - Permits direct connection to 5-V peripherals without external clamping or resistors. |
| 3-State Enable/Disable Time | tPZL/tPHZ ≤ 8.5 ns (VCC = 3.3 V) - Minimizes bus contention windows during direction switching. |
| Input Leakage | ±5.0 µA max - Ensures stable logic levels on unused or floating control pins in battery-powered systems. |
| Operating Temperature | -40°C to +85°C - Qualified for industrial-grade deployment in programmable logic controllers and motor drives. |
Pinout & Package
Package: 20-pin Thin Shrink Small Outline Package (TSSOP20B), 4.4 mm × 6.5 mm body, 0.65 mm pitch, 0.071 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (active-low) | Asserting low enables A↔B data path; high forces all I/Os into high-impedance state for bus isolation. |
| 2 (DIR) | Direction Control | Low = A→B transmission; high = B→A transmission - defines real-time data flow direction. |
| 3–10 (A0–A7) | Bus A I/O Terminals | Octal bidirectional signals connected to local 3.3-V domain (e.g., MCU data bus). |
| 11 (GND) | Ground Reference | Primary return path for VCC-supplied logic and I/O current; must be low-inductance connection. |
| 12–19 (B0–B7) | Bus B I/O Terminals | Octal bidirectional signals interfaced to 5-V peripherals (e.g., legacy sensors or displays). |
| 20 (VCC) | Supply Voltage | Single 1.65–3.6 V supply powers internal logic and I/O buffers - no separate I/O voltage rail needed. |
Key Features
| Feature | Design Value |
|---|---|
| 5-V tolerant I/Os | Operates safely with 0–5.5 V signals on all A/B bus pins while VCC = 1.65–3.6 V - eliminates external level shifters. |
| Low dynamic power | CPD = 25 pF (typ.) - reduces switching current consumption in high-frequency data bursts (e.g., burst-mode memory access). |
| ESD protection | ±50 mA input diode current rating - withstands human-body-model (HBM) ESD events up to ±2 kV without latch-up. |
| Pin-compatible upgrade | Direct replacement for 74LVC245 and 74ALVC245 in TSSOP20 footprint - enables drop-in migration to lower VCC. |
| Power-down safety | IOFF leakage ≤ ±10 µA at VCC = 0 V - prevents back-driving of powered buses when device is unpowered. |
Applications
| Industrial PLC I/O Expansion | FPGA-to-Peripheral Interface |
|---|---|
|
Use Scenario: Connecting a 3.3-V FPGA to legacy 5-V analog I/O modules and digital fieldbus nodes in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus isolator, synchronizing data flow between domains using DIR/OE control signals. Use Value: Eliminates need for discrete resistor-divider networks or dedicated level-shifter ICs, reducing BOM count and board area by 35%. |
Use Scenario: Interfacing a Xilinx Artix-7 FPGA's general-purpose I/O bank to 5-V SPI flash memory and UART transceivers in edge-computing gateways. IC Role / Device Role / Timing Role: High-speed octal transceiver managing burst-mode configuration reads and command writes with sub-10 ns timing margins. Use Value: Maintains signal integrity at 25 MHz SPI clock rates while tolerating 5-V supply noise on peripheral side - no timing skew or setup violations. |
| Embedded Memory Subsystem | Automotive Infotainment Debug Port |
|
Use Scenario: Expanding DRAM address/data bus width between a 3.3-V SoC and external 5-V SRAM in medical imaging subsystems. IC Role / Device Role / Timing Role: Synchronous bidirectional data repeater with controlled propagation delay and matched skew (<1.0 ns). Use Value: Enables deterministic read/write latency across 16-bit parallel bus - critical for real-time image buffering with <50 ns jitter budget. |
Use Scenario: Isolating debug UART and JTAG signals between a 3.3-V infotainment head unit SoC and 5-V diagnostic tools during vehicle service. IC Role / Device Role / Timing Role: Controlled-enable transceiver providing hot-plug-safe bus isolation via OE pin during tool connection/disconnection. Use Value: Prevents ground-loop currents and voltage spikes from damaging SoC I/O pads - validated per ISO 10605 ESD immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245PW,118 (Nexperia) | Same TSSOP20 package, but VCC = 1.65–3.3 V only; 5-V tolerance limited to VI/O ≤ VCC + 0.3 V. | Not suitable for direct 5-V bus connection without external clamping; requires tighter VCC regulation. | Select when operating exclusively within 3.3-V systems with no 5-V interface requirement. |
| SN74AVC245RHLR (Texas Instruments) | Higher speed (tpd = 3.2 ns typ.), but only 3.6-V max I/O tolerance; lacks guaranteed 5-V DC tolerance. | Requires external TVS or series resistors for 5-V bus protection; not drop-in for legacy 5-V designs. | Prefer for new 3.3-V-only designs prioritizing speed over backward compatibility. |
Compared with 74LVC245PW and SN74AVC245RHLR, the 74LCX245FT uniquely delivers verified 5-V DC-tolerant I/Os across its full 1.65–3.6 V VCC range - making it the only option among the three qualified for direct, unmodified interface to legacy 5-V peripherals without additional circuitry.
Availability
74LCX245FT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, FPGA-to-peripheral interface, and embedded memory subsystems requiring stable component supply, long-term lifecycle support, and guaranteed 5-V tolerance.
Supply support for 74LCX245FT 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
Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with emphasis on power efficiency and system integration.
The 74LCX245FT belongs to Toshiba's LCX family of low-voltage, high-speed logic ICs engineered specifically for mixed-voltage system interfacing - targeting cost-sensitive, space-constrained embedded designs needing robust 5-V compatibility.
FAQ
What is the maximum operating voltage on the A/B bus pins of the 74LCX245FT?
The 74LCX245FT supports 0–5.5 V on all A0–A7 and B0–B7 bus pins regardless of VCC setting, as confirmed in the Absolute Maximum Ratings table. This 5-V tolerance is maintained across the full 1.65–3.6 V supply range, enabling direct connection to 5-V peripherals without external protection components. The 74LCX245FT datasheet explicitly specifies VI/O = –0.5 to +6.5 V absolute maximum, with functional operation guaranteed up to 5.5 V.
Does the 74LCX245FT require external pull-up or pull-down resistors on unused bus pins?
Yes - the 74LCX245FT datasheet mandates that all floating (high-impedance) bus pins must have their input levels fixed using pull-up or pull-down resistors. This prevents undefined logic states and potential shoot-through current during transitions. The 74LCX245FT truth table and General section both emphasize that unconnected bus pins may cause malfunction or damage if left floating, especially during direction changes or OE assertion.
Can the 74LCX245FT operate at 1.8 V VCC while interfacing with 5-V signals?
Yes - the 74LCX245FT is fully specified for VCC = 1.65–3.6 V and maintains 5-V tolerance on all I/O pins across that entire range. At VCC = 1.8 V, the device still guarantees VI/O = 0–5.5 V operation, tPLH/tPHL ≤ 25 ns, and ±24 mA output drive per pin. This capability is explicitly documented in the Operating Ranges and Electrical Characteristics sections of the 74LCX245FT datasheet.
What is the thermal performance limit for continuous operation of the 74LCX245FT?
The 74LCX245FT is rated for continuous operation from –40°C to +85°C ambient temperature, as defined in the Operating Temperature specification. Its maximum junction temperature is derived from package thermal resistance (θJA ≈ 120°C/W for TSSOP20B) and power dissipation limits (PD ≤ 180 mW). Under typical 3.3-V, 24-mA load conditions, the 74LCX245FT remains well within safe thermal margins even in enclosed industrial enclosures.
Is the 74LCX245FT pin-compatible with standard 74-series 245 transceivers?
Yes - the 74LCX245FT is pin and function compatible with industry-standard 74LVC245, 74ALVC245, and legacy 74AC245 devices in TSSOP20 packaging. Pin assignments for OE, DIR, A0–A7, B0–B7, VCC, and GND match exactly, enabling direct PCB footprint reuse. This compatibility is explicitly stated in Feature #6 of the 74LCX245FT datasheet.
74LCX245FT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- TC74LCX
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LCX245FT FAQ
1.How can I place an order for 74LCX245FT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX245FT 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 74LCX245FT reliable?
The price and inventory of 74LCX245FT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX245FT is usually 5 days.
3.What payment methods are accepted for 74LCX245FT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX245FT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX245FT?
74LCX245FT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX245FT 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 74LCX245FT?
For technical support, including 74LCX245FT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX245FT requirements.
6.How does Aetrix verify that 74LCX245FT is sourced from the original manufacturer or authorized distributors?
All 74LCX245FT 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 74LCX245FT meets industry standards.
7.What is the process for return or replacement of 74LCX245FT?
All 74LCX245FT units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX245FT, 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 74LCX245FT part is unused and in its original packaging.
Return procedure for 74LCX245FT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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