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onsemi 74LVT2245WM
- Part No.:
- 74LVT2245WM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT2245WM.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
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Product details
Overview
74LVT2245WM from Fairchild Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, 25Ω series resistors on B-port outputs, ±32mA/±64mA A-port drive capability, and 2.7–3.6V supply operation. It enables bidirectional data flow between 3.3V buses and 5V TTL systems in memory expansion and bus isolation applications.
For engineers reviewing the 74LVT2245WM datasheet, pinout, applications, or equivalent options, key selection criteria include direction control (T/R), output enable (OE), A/B port current asymmetry, 25Ω B-port series termination, and SOIC-20 package compatibility with JEDEC MS-013.
Technical Context
The 74LVT2245WM implements an octal non-inverting bidirectional buffer architecture with independent Transmit/Receive (T/R) and Output Enable (OE) controls. Data flows from A to B when T/R = HIGH and OE = LOW; from B to A when T/R = LOW and OE = LOW; both ports enter high-impedance state when OE = HIGH.
It uses advanced BiCMOS technology to achieve ABT-class speed at 3.3V while maintaining low power. The integrated 25Ω series resistor on each B-port output reduces switching overshoot/undershoot without external components, and its 5V-tolerant inputs allow direct interfacing with legacy TTL logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V–3.6V - Operates within standard 3.3V rail tolerance; supports mixed-voltage system interconnect. |
| A-Port Drive Current | –32mA/+64mA - Sinks 64mA or sources 32mA per A-pin, enabling robust driving of heavy capacitive loads or multiple TTL inputs. |
| B-Port Drive Current | –12mA/+12mA - Lower drive strength with built-in 25Ω series resistance for controlled edge rates and reduced EMI. |
| Propagation Delay | 1.2–4.4ns (A→B), 1.2–5.1ns (B→A) - Sub-5ns timing ensures compatibility with high-speed 33MHz+ parallel buses. |
| Input Voltage Range | 0–5.5V - 5V-tolerant inputs permit direct connection to 5V TTL logic without level shifters. |
| 3-STATE Leakage | ±5µA max - Minimal off-state current preserves signal integrity and reduces bus contention risk during disable. |
Pinout & Package
74LVT2245WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with standard gull-wing leads and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control disabling both A and B ports into high-impedance state; enables bus sharing across multiple devices. |
| 2–9 (A0–A7) | Side A I/O Terminals | Bidirectional data pins with ±32mA/+64mA drive; connect to local 3.3V bus or controller side. |
| 10 (GND) | Ground Reference | Primary ground return for all internal circuitry and I/O paths; must be low-inductance connection. |
| 11–18 (B0–B7) | Side B I/O Terminals | Bidirectional data pins with ±12mA drive and integrated 25Ω series resistor; interface to 5V TTL or noise-sensitive lines. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH enables A→B data flow; active-LOW enables B→A flow; determines real-time bus directionality. |
| 20 (VCC) | Power Supply | 3.3V supply input; decoupling capacitor required near pin to suppress switching noise and ensure stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| 25Ω B-port series termination | Reduces output ringing and EMI without external resistors, simplifying PCB layout and improving signal integrity on long traces. |
| 5V-tolerant inputs | Allows direct connection to 5V TTL logic without level-shifting circuitry, lowering BOM cost and board space in mixed-voltage systems. |
| Live insertion/extraction support | Enables hot-swap capability in backplane or modular systems without damaging the device or host circuitry. |
| Power-up/down high-impedance | Prevents bus contention and glitches during power sequencing by holding outputs in high-Z until VCC stabilizes. |
| Latch-up immunity >500mA | Ensures robustness against transient overvoltage events and accidental short circuits in industrial environments. |
Applications
| Memory Expansion Interface | Industrial Backplane Bus Isolation |
|---|---|
Use Scenario: Expanding SRAM or Flash memory capacity on a 3.3V microcontroller board while maintaining compatibility with existing 5V address/data lines. IC Role / Device Role / Timing Role: Bidirectional transceiver managing data/address flow between 3.3V MCU and 5V memory devices, with direction controlled by memory controller R/W signal. Use Value: Eliminates need for discrete level shifters and series resistors; 25Ω B-port termination suppresses reflections on 5V memory bus traces up to 15cm. |
Use Scenario: Isolating control signals between hot-pluggable I/O modules and a central 3.3V host processor in programmable logic controllers. IC Role / Device Role / Timing Role: Direction-controlled bus buffer providing glitch-free signal handoff during module insertion/removal, leveraging power-up high-Z behavior. Use Value: Prevents bus contention during live insertion; ±32mA A-port drive reliably fans out to 10+ downstream FPGA configuration pins. |
| Legacy Peripheral Interfacing | Test Equipment Signal Conditioning |
Use Scenario: Connecting modern 3.3V SoC-based test instrumentation to legacy 5V GPIB or ISA-bus peripherals. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator handling handshake signals (STB, ACK, DATA) with precise direction control via T/R line. Use Value: 5.5V input rating withstands GPIB voltage spikes; sub-5ns propagation delay preserves timing margins in 10MHz handshake protocols. |
Use Scenario: Driving calibrated analog switch matrices or relay drivers from a 3.3V FPGA while meeting 5V logic threshold requirements. IC Role / Device Role / Timing Role: Controlled-slew buffer isolating sensitive analog sections from digital switching noise, using B-port's 25Ω termination to limit di/dt. Use Value: Reduces radiated emissions by >6dB compared to un-terminated drivers; ±12mA B-port output matches relay coil drive specs without external buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245APWR | No built-in 25Ω B-port termination; 3.3V-only I/O; ±24mA drive on both ports. | Suitable only in fully 3.3V systems with external termination; lacks 5V-tolerance for legacy interfacing. | Select when cost sensitivity outweighs 5V interface needs and board layout allows discrete 25Ω resistors. |
| 74LVTH2245WM | Includes bushold inputs (eliminates pull-ups on unused pins); otherwise identical pinout, timing, and drive specs. | Better for systems with floating control lines or partial bus usage where input stability is critical. | Choose 74LVTH2245WM if unused A/B inputs may float; otherwise 74LVT2245WM offers same performance at lower unit cost. |
Compared with SN74LVC2245APWR and 74LVTH2245WM, the 74LVT2245WM uniquely combines 5V-tolerant inputs, asymmetric A/B port drive, and integrated B-port termination-making it optimal for mixed-voltage bus bridging where signal integrity and legacy compatibility are primary concerns.
Availability
74LVT2245WM is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial backplane isolation, legacy peripheral interfacing, test equipment signal conditioning, and hot-swap I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for 74LVT2245WM 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 leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.
The 74LVT2245WM belongs to Fairchild's LVT (Low-Voltage TTL) family, engineered to deliver ABT-speed performance at 3.3V while maintaining backward compatibility with 5V TTL systems-targeting bus bridging in telecom, computing, and automation equipment.
FAQ
What is the function of the T/R pin on the 74LVT2245WM?
The T/R (Transmit/Receive) pin on the 74LVT2245WM 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 real-time direction select allows dynamic bus arbitration without external logic, and is essential for implementing half-duplex communication protocols in systems using the 74LVT2245WM.
Does the 74LVT2245WM support live insertion?
Yes, the 74LVT2245WM supports live insertion and extraction due to its power-up/down high-impedance feature. During power transitions, both A and B ports remain in a high-impedance state until VCC stabilizes, preventing bus contention or signal corruption. This makes the 74LVT2245WM suitable for hot-pluggable modules in industrial backplanes and modular test equipment where the 74LVT2245WM is used for signal routing.
What is the purpose of the 25Ω series resistor on the B-port outputs of the 74LVT2245WM?
The 25Ω series resistor integrated into each B-port output of the 74LVT2245WM dampens signal edges to reduce overshoot, undershoot, and ringing on transmission lines-especially beneficial when driving longer traces or unterminated 5V buses. This eliminates the need for external series resistors, saving PCB area and assembly cost while improving signal integrity in applications like memory expansion where the 74LVT2245WM bridges voltage domains.
Can the 74LVT2245WM interface directly with 5V TTL logic?
Yes, the 74LVT2245WM features 5V-tolerant inputs (VI up to 5.5V) and can accept 5V TTL logic levels on both A and B ports while operating from a 3.3V supply. Its outputs also drive 5V TTL inputs reliably due to VOH ≥ 2.0V at –12mA (B-port) and ≥ 2.4V at –8mA (A-port). This direct interoperability is a core design feature of the 74LVT2245WM for mixed-voltage system integration.
How does the 74LVT2245WM differ from the 74LVTH2245WM?
The 74LVT2245WM and 74LVTH2245WM share identical pinout, timing, drive strength, and 25Ω B-port termination-but the 74LVTH2245WM adds bushold circuitry on all data inputs to maintain logic state when unused, eliminating external pull-up resistors. The 74LVT2245WM lacks bushold, making it slightly lower-cost where all inputs are actively driven. Both are drop-in replacements except where floating inputs require stabilization in the 74LVT2245WM application.
74LVT2245WM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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-SOIC
74LVT2245WM FAQ
1.How can I place an order for 74LVT2245WM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT2245WM 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 74LVT2245WM reliable?
The price and inventory of 74LVT2245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT2245WM is usually 5 days.
3.What payment methods are accepted for 74LVT2245WM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT2245WM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT2245WM?
74LVT2245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT2245WM 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 74LVT2245WM?
For technical support, including 74LVT2245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT2245WM requirements.
6.How does Aetrix verify that 74LVT2245WM is sourced from the original manufacturer or authorized distributors?
All 74LVT2245WM 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 74LVT2245WM meets industry standards.
7.What is the process for return or replacement of 74LVT2245WM?
All 74LVT2245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT2245WM, 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 74LVT2245WM part is unused and in its original packaging.
Return procedure for 74LVT2245WM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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