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onsemi 74LVT2245WMX
- Part No.:
- 74LVT2245WMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LVT2245WMX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,076
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Product details
Overview
74LVT2245WMX from Fairchild Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs and integrated 25Ω series resistors on B-port outputs, designed for 3.3V bus interfacing between TTL and 5V systems. It features A-port drive capability of –32mA/+64mA, B-port drive of –12mA/+12mA, and operates across –40°C to +85°C.
For engineers reviewing the 74LVT2245WMX datasheet, pinout, applications, or equivalent options, key selection criteria include direction control via T/R input, independent 3-STATE enable via OE, B-port signal integrity enhancement from built-in 25Ω termination, and compatibility with live insertion and power-up/down high-impedance behavior.
Technical Context
The 74LVT2245WMX implements an octal non-inverting bidirectional buffer architecture where data flow direction is controlled by the active-HIGH T/R input: HIGH enables A→B transmission, LOW enables B→A reception. The OE input, when HIGH, places both A and B ports in high-impedance state regardless of T/R state.
It uses advanced BiCMOS technology to achieve ABT-class speed at 3.3V supply while maintaining low power dissipation. The B-port outputs integrate 25Ω series resistors to suppress overshoot/undershoot, and all I/Os support 5V-tolerant inputs with VI up to 5.5V under recommended operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V–3.6V - Ensures stable operation in 3.3V systems with ±0.3V margin; not rated for 5V supply. |
| A-Port IOL/IOH | 64mA/–32mA - Supports high-drive bus loading on A side, e.g., driving multiple LVT loads or stubs. |
| B-Port IOL/IOH | 12mA/–12mA - Lower drive matches point-to-point or lightly loaded B-side interconnects. |
| B-Port Series R | 25Ω - Integrated resistor reduces ringing and EMI on B-port outputs without external components. |
| tPLH/tPHL (A Port) | 1.2ns–4.0ns @ 3.3V - Enables sub-5ns propagation for high-speed backplane or memory bus timing budgets. |
| tPZH/tPZL (OE to Output) | 1.3ns–7.1ns @ 3.3V - Fast enable/disable supports dynamic bus arbitration and hot-swap protocols. |
| Input Voltage Range | 0V–5.5V - Allows direct connection to 5V logic without level shifters or clamping diodes. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial ambient environments including motor control and telecom chassis. |
Pinout & Package
74LVT2245WMX is housed in a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, M20B), with 1.27mm pitch and standard gull-wing leads. Pin 1 is marked by a notch or beveled corner; the package is lead-free per JEDEC J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: asserts high-impedance on both A and B ports simultaneously; overrides T/R state. |
| 2 (A0) | Side A Data Terminal | Bi-directional I/O: functions as input during B→A receive, output during A→B transmit, or high-Z when OE=HIGH. |
| 3 (A1) | Side A Data Terminal | Same bidirectional behavior as A0; all A0–A7 share identical electrical characteristics and timing. |
| 4 (A2) | Side A Data Terminal | Supports full octal data path; no internal multiplexing-each A/B pair operates independently. |
| 5 (A3) | Side A Data Terminal | Compatible with 5V-tolerant inputs; VIH = 2.0V min ensures robust noise margin in mixed-voltage buses. |
| 6 (A4) | Side A Data Terminal | Drives up to –32mA/64mA; suitable for fan-out to ≥10 LVT loads under worst-case VCC and temperature. |
| 7 (A5) | Side A Data Terminal | Includes input current limits (±1µA at VCC/GND) ensuring minimal static loading on upstream drivers. |
| 8 (A6) | Side A Data Terminal | Low input capacitance (4pF typical) minimizes switching power and signal degradation at >100MHz edges. |
| 9 (A7) | Side A Data Terminal | Shares same DC and AC specs as A0–A6; no skew specification between A-port outputs (max 1.0ns). |
| 10 (GND) | Ground Reference | Dedicated ground pin; ICCZ leakage < ±100µA ensures stable 3-STATE behavior during power sequencing. |
| 11 (B7) | Side B Data Terminal | Bidirectional I/O with integrated 25Ω series resistor; reduces edge-induced reflections on PCB traces. |
| 12 (B6) | Side B Data Terminal | Same 25Ω series resistance applies to all B0–B7; VOL = 0.8V max @ 12mA ensures clean LOW-level signaling. |
| 13 (B5) | Side B Data Terminal | Lower drive strength avoids overdriving short stubs or unterminated lines common in modular backplanes. |
| 14 (B4) | Side B Data Terminal | VI = 0–5.5V tolerance allows direct interface to legacy 5V peripherals without external protection. |
| 15 (B3) | Side B Data Terminal | Dynamic VOLP/VOLV specs (±0.8V) confirm suppression of ground bounce and crosstalk during switching. |
| 16 (B2) | Side B Data Terminal | Capacitance CI/O = 8pF typical enables >200MHz signal integrity on properly terminated B-port traces. |
| 17 (B1) | Side B Data Terminal | No bushold feature - unlike LVTH variant; unused B inputs require external pull-up/pull-down for defined state. |
| 18 (B0) | Side B Data Terminal | Pin 18 is B0, not B1 - ordering follows standard LSB-first convention; matches truth table and logic symbol. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH enables A→B data flow; active-LOW enables B→A; transition time independent of OE state. |
| 20 (VCC) | Supply Voltage | 3.3V nominal; ICCZ = 0.19mA max in 3-STATE ensures low standby current in idle bus segments. |
Key Features
| Feature | Design Value |
|---|---|
| 25Ω B-port series termination | Eliminates need for discrete 25Ω resistors on each B-output trace, reducing BOM count and layout area. |
| 5V-tolerant inputs (0–5.5V) | Enables direct connection to 5V controllers or peripherals without level-shifting circuitry or voltage dividers. |
| Live insertion/extraction support | Power-up/down high-impedance behavior prevents bus contention during hot-plug events in modular systems. |
| A-port high-drive capability | –32mA/+64mA drive allows reliable fan-out to multiple LVT/LVTH receivers or longer PCB traces. |
| Low propagation skew (≤1.0ns) | Ensures simultaneous switching across all eight channels, critical for byte-wide synchronous bus timing. |
| ESD robustness (HBM > 2000V) | Withstands handling and board assembly without additional protection, reducing test and qualification overhead. |
Applications
| Industrial Backplane Interface | Memory Expansion Module |
|---|---|
|
Use Scenario: Interfacing a 3.3V FPGA-based controller to legacy 5V peripheral cards via a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and bus isolation using T/R and OE signals. Use Value: Built-in 25Ω B-port resistors suppress reflections on long backplane traces, eliminating need for 16 discrete terminators. |
Use Scenario: Adding SRAM or Flash memory to a 3.3V microcontroller system with limited I/O pins. IC Role / Device Role / Timing Role: Octal bus buffer extending address/data bus width while providing 3-STATE isolation during memory access cycles. Use Value: A-port's 64mA sink capability drives heavy capacitive loads of multi-chip memory modules without signal degradation. |
| Hot-Swappable I/O Carrier | Legacy System Upgrade Bridge |
|
Use Scenario: Modular PLC I/O carrier board that must be inserted/removed while main controller remains powered. IC Role / Device Role / Timing Role: Isolates carrier bus from main backplane during insertion using power-up high-Z and OE-controlled disable. Use Value: Glitch-free bus loading prevents spurious writes or resets during hot-swap transitions, meeting IEC 61000-4-2 compliance. |
Use Scenario: Retrofitting a 5V industrial controller with modern 3.3V sensors or communication ICs. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional bridge translating control/data signals between mismatched voltage domains. Use Value: 5.5V input tolerance and 3.3V-compatible outputs eliminate external level shifters, simplifying redesign and certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH2245WMX | Includes bushold inputs on all data pins; eliminates need for external pull-ups on unused inputs. | Preferred in systems with floating or intermittently connected inputs (e.g., field-wirable I/O headers). | Select 74LVTH2245WMX only if bushold functionality is required; otherwise 74LVT2245WMX offers lower input leakage and simpler biasing. |
| SN74LVC245APW | No integrated series resistors; 3.3V-only I/O (not 5V-tolerant); higher drive (–24mA/+24mA on both sides). | Suitable for fully 3.3V systems with controlled impedance routing but requires external termination for reflection control. | Choose SN74LVC245APW for cost-sensitive, single-supply designs where B-port termination is handled externally or not needed. |
Compared with 74LVTH2245WMX, the 74LVT2245WMX lacks bushold but offers tighter input leakage and simpler biasing; versus SN74LVC245APW, it provides 5V-tolerance and B-port termination at the expense of slightly lower B-port drive, making it superior for mixed-voltage backplane interfaces.
Availability
74LVT2245WMX is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, hot-swappable I/O carriers, and legacy system upgrade bridges requiring stable component supply and long-term obsolescence management.
Supply support for 74LVT2245WMX 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 74LVT2245WMX belongs to Fairchild's Low-Voltage Transceiver (LVT) family, engineered for high-speed 3.3V bus interfacing with 5V system compatibility and robust hot-swap operation in mission-critical equipment.
FAQ
What is the maximum supply voltage rating for the 74LVT2245WMX?
The absolute maximum VCC rating for the 74LVT2245WMX is +4.6V, but the recommended operating range is strictly 2.7V to 3.6V. Operation outside this range risks parametric shift or reliability degradation; sustained use above 3.6V voids warranty and may cause latch-up per the datasheet's Absolute Maximum Ratings table.
Does the 74LVT2245WMX support 5V logic inputs?
Yes, the 74LVT2245WMX supports 5V-tolerant inputs: VI can range from 0V to 5.5V under recommended operating conditions. This allows direct connection to 5V microcontrollers or peripherals without level shifters, confirmed by VIH = 2.0V min and VIL = 0.8V max specifications at VCC = 2.7–3.6V.
Is the 74LVT2245WMX pin-compatible with the 74LVTH2245WMX?
Yes, the 74LVT2245WMX and 74LVTH2245WMX share identical pinout, package (M20B SOIC), and functional block diagram. The only difference is the presence of bushold circuitry on all inputs of the LVTH variant; no PCB layout changes are required when substituting between them in existing designs.
What is the purpose of the 25Ω series resistor on the B port of the 74LVT2245WMX?
The 25Ω series resistor integrated into each B-port output of the 74LVT2245WMX dampens signal edge reflections on PCB traces, reducing overshoot and undershoot. This improves signal integrity on unterminated or moderately loaded buses, eliminating the need for 8 discrete surface-mount resistors and associated layout space.
Can the 74LVT2245WMX be used in hot-swap applications?
Yes, the 74LVT2245WMX supports live insertion/extraction due to its power-up/power-down high-impedance behavior. When VCC is ramping or absent, both A and B ports remain in high-Z state, preventing bus contention. This is validated by the "glitch-free bus loading" feature and specified IPU/PD leakage of ±100µA.
74LVT2245WMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
74LVT2245WMX FAQ
1.How can I place an order for 74LVT2245WMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT2245WMX 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 74LVT2245WMX reliable?
The price and inventory of 74LVT2245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT2245WMX is usually 5 days.
3.What payment methods are accepted for 74LVT2245WMX?
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74LVT2245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT2245WMX 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 74LVT2245WMX?
For technical support, including 74LVT2245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT2245WMX requirements.
6.How does Aetrix verify that 74LVT2245WMX is sourced from the original manufacturer or authorized distributors?
All 74LVT2245WMX 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 74LVT2245WMX meets industry standards.
7.What is the process for return or replacement of 74LVT2245WMX?
All 74LVT2245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT2245WMX, 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 74LVT2245WMX part is unused and in its original packaging.
Return procedure for 74LVT2245WMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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