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onsemi 74LVT2245SJX
- Part No.:
- 74LVT2245SJX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVT2245SJX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,157
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Product details
Overview
74LVT2245SJX from Fairchild Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, 25Ω series resistors on B-port outputs, and 3.3V VCC operation compatible with 5V TTL interfaces. It supports bus-oriented data transfer between A and B ports under T/R control, features ±12mA/±64mA drive capability per port, and operates across –40°C to +85°C for industrial backplane and memory interface applications.
For engineers reviewing the 74LVT2245SJX datasheet, pinout, applications, or equivalent options, key selection criteria include direction control logic (T/R), output enable timing (tPZH/tPLZ), B-port series termination for signal integrity, 3-STATE leakage current (IOZL ≤ 5µA), and compatibility with 5V-tolerant system buses.
Technical Context
The 74LVT2245SJX implements an octal non-inverting bidirectional buffer architecture with independent 3-STATE control via OE and directional control via active-HIGH T/R. Data flows from A to B when T/R = HIGH and from B to A when T/R = LOW; OE = HIGH disables both ports into high-impedance state.
Its BiCMOS fabrication enables 3.3V operation with 5V input tolerance (VI up to 5.5V), 25Ω built-in series resistance on B-port outputs to suppress overshoot/undershoot, and power-up/down high-impedance behavior to prevent bus glitches during hot-swap events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures stable operation in 3.3V systems with ±0.3V margin. |
| IOH/IOL (A Port) | –32mA / +64mA - Supports driving heavy capacitive loads or multiple TTL inputs on A side. |
| IOH/IOL (B Port) | –12mA / +12mA - Lower drive matches impedance-controlled signaling; 25Ω series resistor reduces EMI. |
| tPLH/tPHL (A Port) | 1.2ns to 4.0ns - Enables sub-5ns propagation for high-speed address/data bus isolation. |
| tPZH/tPZL (B Port) | 1.3ns to 7.3ns - Fast 3-STATE enable/disable prevents bus contention during direction switching. |
| Input Voltage Range | 0V to 5.5V - Allows direct interfacing with 5V logic without level shifters. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and telecom equipment. |
Pinout & Package
74LVT2245SJX is packaged in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (package code M20D), with gull-wing leads and standard JEDEC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: drives both A and B ports into high-impedance when HIGH. |
| 2 (T/R) | Transmit/Receive Input | Active-HIGH selects A→B direction; active-LOW selects B→A direction. |
| 3–10 (A0–A7) | Side A I/O Terminals | Bidirectional data lines with ±64mA drive strength; connect to local 3.3V bus or controller. |
| 11–18 (B0–B7) | Side B I/O Terminals | Bidirectional data lines with ±12mA drive and integrated 25Ω series termination for clean edge control. |
| 19 (GND) | Ground Reference | Primary ground return for all I/O and supply currents; requires low-inductance PCB connection. |
| 20 (VCC) | Power Supply | 3.3V nominal supply; decoupling capacitor (0.1µF) required within 1cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Supports direct connection to 5V TTL buses without external level translation circuitry. |
| 25Ω B-port series termination | Reduces output ringing and improves signal integrity on stubbed or unterminated transmission lines. |
| Hot-plug capable | Power-up/down high-impedance ensures no bus loading during insertion or removal in live systems. |
| Low dynamic power | ICCZ = 0.19mA in 3-STATE mode minimizes standby current in multi-transceiver bus architectures. |
| Latch-up immunity | Exceeds 500mA per JEDEC JESD78, enabling robust operation in noisy industrial environments. |
Applications
| Memory Interface Isolation | Backplane Bus Translation |
|---|---|
|
Use Scenario: Isolating 3.3V microcontroller address/data bus from legacy 5V SRAM or EPROM modules. IC Role / Device Role / Timing Role: Bidirectional transceiver providing voltage-level bridging and direction-controlled data flow between mismatched voltage domains. Use Value: Eliminates need for discrete level shifters while maintaining sub-5ns propagation delay for synchronous memory access timing. |
Use Scenario: Interfacing 3.3V FPGA I/O banks to 5V-compatible VME or ISA backplane slots. IC Role / Device Role / Timing Role: Directionally controlled bus transceiver enabling safe, glitch-free communication across mixed-voltage backplane segments. Use Value: Built-in 25Ω B-port termination suppresses reflections on long backplane traces, improving signal fidelity at >25MHz clock rates. |
| Hot-Swappable Module Interface | Industrial PLC I/O Expansion |
|
Use Scenario: Enabling live insertion/extraction of I/O daughter cards in modular automation controllers. IC Role / Device Role / Timing Role: 3-STATE-enabled transceiver ensuring zero bus contention during card insertion/removal sequences. Use Value: Power-up/down high-impedance behavior prevents transient glitches that could corrupt host processor register reads/writes. |
Use Scenario: Extending digital input/output capacity of 3.3V PLC mainboards to 5V sensor/actuator subsystems. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional buffer managing command/response traffic between CPU and field-side peripherals. Use Value: ±64mA A-port drive supports direct connection to optocoupler inputs or relay drivers without external buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245APW | No built-in 25Ω B-port series resistor; lower drive (±24mA A-port, ±24mA B-port); 1.65–3.6V VCC. | Suitable for lower-speed, space-constrained designs where external termination is acceptable. | Prefer 74LVT2245SJX when B-port signal integrity on unterminated lines is critical. |
| 74LVTH2245SJX | Includes bushold inputs (eliminates pull-ups on unused pins); otherwise identical pinout, timing, and drive specs. | Required when system has floating or high-impedance A/B inputs needing automatic hold without external components. | Select 74LVT2245SJX only if bushold is unnecessary-reduces cost and simplifies layout. |
Compared with SN74LVC2245APW and 74LVTH2245SJX, the 74LVT2245SJX uniquely balances 5V-tolerant interfacing, B-port integrated termination, and industrial temperature range-making it optimal for noise-sensitive backplane and memory expansion where signal integrity and hot-swap reliability are prioritized over ultra-low voltage operation or bushold functionality.
Availability
74LVT2245SJX is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, and hot-swappable I/O subsystems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 74LVT2245SJX 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 analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.
The 74LVT2245SJX belongs to Fairchild's LVT (Low-Voltage TTL) logic family, designed specifically for 3.3V systems requiring 5V-tolerant interfacing, fast propagation, and robust bus isolation in mission-critical embedded applications.
FAQ
What is the function of the T/R pin on the 74LVT2245SJX?
The T/R (Transmit/Receive) pin on the 74LVT2245SJX controls data direction: when HIGH, it enables unidirectional data flow from A-port to B-port; when LOW, it enables flow from B-port to A-port. This allows the 74LVT2245SJX to serve as a bidirectional bus transceiver without external direction logic, simplifying system design in shared-bus architectures.
Does the 74LVT2245SJX support hot insertion?
Yes, the 74LVT2245SJX supports live insertion and extraction due to its power-up/power-down high-impedance feature. During power transitions, both A and B ports enter a high-Z state automatically, preventing bus contention or signal corruption-critical for modular systems like industrial PLCs and telecom line cards where 74LVT2245SJX is commonly deployed.
What is the purpose of the 25Ω series resistor on the B-port outputs of the 74LVT2245SJX?
The 25Ω series resistor integrated into each B-port output of the 74LVT2245SJX dampens signal reflections and reduces overshoot/undershoot on transmission lines, especially in unterminated or stub-loaded configurations. This improves signal integrity without requiring external resistors-directly enhancing reliability in backplane and memory interface applications using the 74LVT2245SJX.
Can the 74LVT2245SJX interface directly with 5V logic devices?
Yes, the 74LVT2245SJX accepts input voltages up to 5.5V while operating from a 3.3V supply, enabling direct interfacing with 5V TTL systems without level shifters. Its 5V-tolerant inputs and 3.3V-compatible outputs make the 74LVT2245SJX ideal for bridging voltage domains in mixed-signal industrial control and legacy upgrade scenarios.
How does the 74LVT2245SJX differ from the 74LVTH2245SJX variant?
The 74LVT2245SJX lacks bushold inputs, whereas the 74LVTH2245SJX includes bushold circuitry to maintain logic states on unused inputs without external pull-ups. Both share identical pinout, timing, drive strength, and 25Ω B-port termination. Choose the 74LVT2245SJX when bushold is unnecessary-reducing BOM count and layout complexity while retaining full 74LVT2245SJX functionality.
74LVT2245SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 32mA, 64mA; 12mA, 12mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
74LVT2245SJX FAQ
1.How can I place an order for 74LVT2245SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT2245SJX 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 74LVT2245SJX reliable?
The price and inventory of 74LVT2245SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT2245SJX is usually 5 days.
3.What payment methods are accepted for 74LVT2245SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT2245SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT2245SJX?
74LVT2245SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT2245SJX 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 74LVT2245SJX?
For technical support, including 74LVT2245SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT2245SJX requirements.
6.How does Aetrix verify that 74LVT2245SJX is sourced from the original manufacturer or authorized distributors?
All 74LVT2245SJX 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 74LVT2245SJX meets industry standards.
7.What is the process for return or replacement of 74LVT2245SJX?
All 74LVT2245SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT2245SJX, 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 74LVT2245SJX part is unused and in its original packaging.
Return procedure for 74LVT2245SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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