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STMicroelectronics 74LVQ245TTR
- Part No.:
- 74LVQ245TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVQ245TTR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,255
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Product details
Overview
74LVQ245TTR from STMicroelectronics is a low-voltage CMOS octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between two 8-bit buses. It operates from 2.0 V to 3.6 V, delivers 5.7 ns typical propagation delay at 3.3 V, supports 24 mA PCI bus drive capability, and features symmetrical 12 mA output drive (|IOH| = IOL) and 75 Ω transmission line driving - used in 3.3 V system interconnects including industrial control backplanes and embedded peripheral interfaces.
For engineers reviewing the 74LVQ245TTR datasheet, 74LVQ245TTR pinout, 74LVQ245TTR application, or 74LVQ245TTR equivalent, key selection criteria include directional control logic (DIR), output enable (G), high-impedance isolation behavior, 75 Ω line driving compliance, and guaranteed PCI-level drive strength at 24 mA.
Technical Context
The device implements dual-bus bidirectional communication via DIR-controlled signal flow direction and G-gated 3-state output enable/disable. Its C2MOS sub-micron process ensures latch-up immunity and 2 kV ESD protection on all pins.
It guarantees balanced tPLH ≅ tPHL propagation delays, low-noise VOLP = 0.5 V (typ.) at 3.3 V, and operates across –55 °C to +125 °C with 1.2 V data retention - enabling robust use in thermally demanding industrial environments without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 3.6 V operating; 1.2 V data retention enables low-power suspend states |
| tPD (Typ.) | 5.7 ns at VCC = 3.3 V - enables >100 MHz bus handshaking in synchronous systems |
| IOL / IOH | 12 mA min. at VCC = 3.0 V - ensures reliable 75 Ω transmission line termination |
| PCI Drive | 24 mA guaranteed - meets PCI Local Bus Specification Level-2 electrical requirements |
| VOLP (Typ.) | 0.5 V at VCC = 3.3 V, CL = 50 pF - reduces ground bounce in dense PCB layouts |
| ICC (Max.) | 40 µA at TA = 125 °C - supports ultra-low static power in always-on subsystems |
| CIN / CI/O | 5 pF input / 10 pF I/O capacitance - minimizes capacitive loading on driving sources |
Pinout & Package
TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = B→A data flow; Low = A→B; defines real-time bus arbitration path |
| 19 (G) | Output Enable Input | Low = active transceiver; High = all A/B ports enter high-impedance isolation |
| 2–9 (A1–A8) | Bus A I/O Terminals | Bidirectional data interface for local bus or microcontroller side; 3-state when G = High |
| 11–18 (B1–B8) | Bus B I/O Terminals | Bidirectional data interface for peripheral or memory side; isolated when G = High |
| 10 (GND) | Ground Reference | 0 V reference for all I/O and internal logic; must be low-inductance connection |
| 20 (VCC) | Supply Voltage | Primary power rail; decoupling capacitor required within 5 mm of pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Output Drive | |IOH| = IOL ≥ 12 mA at 3.0 V - eliminates skew-induced timing margin loss in differential-like routing |
| 75 Ω Line Driving | Guaranteed incident-wave switching on 75 Ω traces - enables direct connection to coaxial or controlled-impedance PCB traces without external termination |
| Low Dynamic Noise | VOLP = 0.5 V (typ.) at 3.3 V - reduces simultaneous switching noise (SSN) in multi-transceiver systems |
| Extended Temp Range | –55 °C to +125 °C operation - qualified for under-hood automotive and industrial motor drive control applications |
| Latch-Up Immunity | Improved C2MOS process - withstands >200 mA transient current per IEC 61000-4-2 without functional disruption |
Applications
| Industrial Backplane Interconnect | PCI-Compatible Peripheral Interface |
|---|---|
Use Scenario: Isolating CPU and FPGA buses in programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and bus contention via DIR/G control. Use Value: 24 mA PCI drive strength ensures signal integrity across 15 cm backplane traces; 5.7 ns tPD supports 80 MHz burst transfers. | Use Scenario: Connecting legacy PCI add-in cards to modern low-voltage host controllers. IC Role / Device Role / Timing Role: Voltage-tolerant bus buffer providing 3.3 V logic compatibility while meeting PCI electrical specs. Use Value: Guaranteed 24 mA drive and 75 Ω line matching eliminate need for discrete termination resistors on card edge connectors. |
| Low-Power Embedded Data Bridge | Automotive Body Control Module |
Use Scenario: Enabling bidirectional sensor data exchange between 3.3 V MCU and 2.5 V ASIC in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Direction-controlled voltage-aware transceiver supporting mixed-supply domain bridging. Use Value: 2.0–3.6 V VCC range and 1.2 V data retention allow graceful shutdown during brown-out events without data loss. | Use Scenario: Isolating infotainment SoC and CAN gateway MCU buses in harsh-temperature vehicle cabins. IC Role / Device Role / Timing Role: High-reliability bus isolator with extended temperature qualification and ESD-hardened I/O. Use Value: –55 °C to +125 °C rating and 2 kV HBM ESD protection ensure uninterrupted operation in thermal cycling environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower ICC (10 µA typ.), but only rated to 85 °C ambient; no 24 mA PCI guarantee | Consumer-grade portable electronics where extended temperature is not required | Select when cost and quiescent current dominate over industrial reliability and PCI compliance |
| 74ALVC245MTCX | Faster tPD (2.8 ns typ.), but higher VOLP (0.8 V) and narrower VCC range (2.3–3.6 V) | High-speed test equipment requiring minimal propagation skew | Select when sub-3 ns timing is critical and noise margin can be managed externally |
Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74LVQ245TTR uniquely combines PCI-compliant 24 mA drive, –55 °C to +125 °C operation, and 75 Ω line driving - making it the only choice for ruggedized backplane and automotive body control applications requiring guaranteed electrical interoperability.
Availability
74LVQ245TTR is available at Aetrix Electronics and suitable for industrial backplane interconnects, PCI-compatible peripheral interfaces, and low-power embedded data bridges requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVQ245TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The 74LVQ series targets low-voltage, low-noise, high-reliability bus interfacing - specifically engineered for 3.3 V system integration where ESD robustness, transmission line matching, and extended temperature stability are mandatory.
FAQ
What is the maximum recommended capacitive load for 74LVQ245TTR outputs?
The device is characterized with CL = 50 pF in AC specifications, and its 75 Ω transmission line driving capability implies optimal performance with ≤50 pF total load (including trace and receiver capacitance). Exceeding 75 pF may increase tPLH/tPHL beyond 13 ns max and elevate VOLP above 0.8 V, risking signal integrity in high-speed buses.
Can 74LVQ245TTR operate with VCC = 2.5 V while maintaining PCI drive strength?
No - the 24 mA PCI drive guarantee applies only at VCC ≥ 3.0 V per Table 6. At 2.5 V, IOL/IOH drops to ~8 mA (extrapolated from 3.0 V min. spec), insufficient for PCI Level-2 compliance. For 2.5 V systems, use directional control and external drivers or select a dedicated 2.5 V PCI buffer.
How does the DIR input behave during power-up or brown-out conditions?
DIR has no internal pull-up/down; it must be actively driven or externally biased. If left floating during VCC ramp-up, undefined direction state may cause bus contention. STMicroelectronics recommends tying DIR to GND or VCC via ≤10 kΩ resistor during power sequencing to enforce known initial direction before firmware initialization.
Is the TSSOP-20 package of 74LVQ245TTR compatible with standard SO-20 footprints?
No - TSSOP-20 (6.5 × 4.4 mm, 0.65 mm pitch) is physically incompatible with SO-20 (13.0 × 7.6 mm, 1.27 mm pitch). Layout requires dedicated TSSOP land pattern per ST's 0087225C mechanical drawing. Thermal pad variants are not present; reflow profile must follow JEDEC J-STD-020 for TSSOP.
74LVQ245TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVQ
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVQ245TTR FAQ
1.How can I place an order for 74LVQ245TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVQ245TTR 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 74LVQ245TTR reliable?
The price and inventory of 74LVQ245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVQ245TTR is usually 5 days.
3.What payment methods are accepted for 74LVQ245TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVQ245TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVQ245TTR?
74LVQ245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVQ245TTR 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 74LVQ245TTR?
For technical support, including 74LVQ245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVQ245TTR requirements.
6.How does Aetrix verify that 74LVQ245TTR is sourced from the original manufacturer or authorized distributors?
All 74LVQ245TTR 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 74LVQ245TTR meets industry standards.
7.What is the process for return or replacement of 74LVQ245TTR?
All 74LVQ245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVQ245TTR, 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 74LVQ245TTR part is unused and in its original packaging.
Return procedure for 74LVQ245TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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