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onsemi 74ALVCH245MTCX
- Part No.:
- 74ALVCH245MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ALVCH245MTCX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
74ALVCH245MTCX from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with bushold inputs and 3-STATE outputs, designed for bus interface applications between mixed-voltage domains. It operates from 1.65V to 3.6V VCC, delivers 3.6 ns max propagation delay at 3.3V, and eliminates external pull-up resistors via active bushold on all A/B-side data pins.
For engineers reviewing the 74ALVCH245MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional voltage-level translation capability, bushold-enabled floating-input robustness, 3-STATE control timing (tPZL/tPHZ ≤ 8.6 ns), and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The 74ALVCH245MTCX implements dual-port bidirectional data flow controlled by an active-low OE and polarity-selective T/R input-enabling either A→B or B→A transfer. Its bushold circuitry actively maintains valid logic states on unused A0–A7 and B0–B7 inputs without external biasing, reducing component count and board space.
It uses advanced CMOS fabrication for simultaneous high speed and low power: quiescent ICC ≤ 10 µA at 3.6V, while supporting ±24 mA output drive at 3.0V and featuring Quiet Series™ EMI reduction circuitry validated per JEDEC JED78 latchup compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - supports interoperability across 1.8V, 2.5V, and 3.3V logic domains |
| tPD Max | 3.6 ns @ 3.0–3.6V - enables sub-278 MHz bus operation with timing margin |
| IOH/IOL | ±24 mA @ 3.0V - drives standard TTL loads and short traces without buffering |
| Bushold Current | ±75 µA @ VIN = 0.8V/2.0V, VCC = 3.0V - sustains stable logic levels on unconnected data lines |
| tPZH/tPLZ Max | 8.6 ns @ CL = 50 pF, VCC = 1.8V - ensures fast 3-STATE disable for bus arbitration |
| Operating Temp | −40°C to +85°C - qualified for industrial ambient environments |
| ESD HBM | >2000V - withstands typical handling and assembly electrostatic events |
Pinout & Package
74ALVCH245MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with 0.65 mm lead pitch and exposed pad not present. Pin mapping follows standard 74-series transceiver layout with symmetrical A/B ports and dual-control inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Disables both A and B ports simultaneously into high-impedance state when HIGH |
| 2 (T/R) | Direction Control Input | LOW = B→A data flow; HIGH = A→B data flow |
| 3–10 (A0–A7) | Side-A I/O with Bushold | Bidirectional port with active bushold - no pull-ups needed on floating inputs |
| 11 (GND) | Ground Reference | Common return path for VCC and signal currents |
| 12–19 (B0–B7) | Side-B I/O with Bushold | Complementary bidirectional port, functionally identical to A-side |
| 20 (VCC) | Power Supply | Single supply rail supporting 1.65–3.6V operation |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Actively holds A0–A7 and B0–B7 at valid logic levels without external resistors, reducing BOM count and layout complexity |
| Low-Voltage Operation | 1.65V minimum VCC enables direct interfacing with 1.8V microcontrollers and FPGAs |
| Quiet Series™ EMI Reduction | Patented output driver design lowers switching noise and radiated emissions in dense PCB environments |
| JEDEC JED78 Latchup Compliance | Guarantees immunity to destructive latchup under normal operating conditions and transient stress |
| 3-STATE Timing Control | Output enable/disable times (tPZL/tPHZ) specified down to 1.8V, enabling reliable bus sharing in multi-master systems |
Applications
| Memory Interface Expansion | Microcontroller Bus Bridging |
|---|---|
Use Scenario: Extending address/data bus between a 3.3V ARM Cortex-M4 MCU and legacy 2.5V SRAM module. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing A/B port direction via T/R and isolating buses via OE. Use Value: Eliminates need for discrete level shifters and pull-up networks while maintaining <3.6 ns propagation delay for synchronous access timing. | Use Scenario: Interfacing a 1.8V FPGA configuration interface with a 3.3V EEPROM programmer header. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional buffer enabling safe read/write handshaking across supply domains. Use Value: Bushold prevents floating inputs during FPGA configuration reset, avoiding spurious EEPROM writes or read corruption. |
| Industrial I/O Module Backplane | Test Equipment Signal Routing |
Use Scenario: Data multiplexing across hot-swappable I/O cards in a 24V-powered PLC rack with mixed 2.5V/3.3V sensor interfaces. IC Role / Device Role / Timing Role: Isolated bus transceiver providing 3-STATE control per card slot and bushold protection against connector open-circuit faults. Use Value: Enables deterministic bus arbitration and fault resilience without additional termination or bias components per slot. | Use Scenario: Reconfigurable signal path routing in automated test equipment connecting DUTs with varying logic families (LVCMOS, LVTTL). IC Role / Device Role / Timing Role: Programmable direction-controlled buffer allowing dynamic A↔B data path reversal under controller command. Use Value: Supports multiple DUT protocols using single hardware layer, with tPZH ≤ 8.6 ns ensuring minimal path reconfiguration latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH245RHLR | TI part with identical 1.65–3.6V range and bushold, but QFN-24 package (5×5 mm); tPD = 3.2 ns @ 3.3V | Requires PCB redesign due to different footprint and thermal pad; better high-frequency noise performance | Select when board space allows QFN and lower propagation delay is critical |
| 74LVC245ABQ | Nexperia part offers same voltage range and 3-STATE, but lacks bushold; requires external pull-ups on unused pins | Suitable only where all A/B pins are actively driven; not robust for partial-bus or hot-plug use cases | Select only if bushold is unnecessary and cost sensitivity outweighs design flexibility |
Compared with SN74AVCH245RHLR and 74LVC245ABQ, the 74ALVCH245MTCX provides unique bushold-enabled floating-input resilience in a compact TSSOP-20 package, making it optimal for industrial backplanes and modular interfaces where pin float conditions are unavoidable.
Availability
74ALVCH245MTCX is available at Aetrix Electronics and suitable for memory interface expansion, microcontroller bus bridging, and industrial I/O module backplane designs requiring stable component supply, long-term lifecycle support, and consistent TSSOP-20 sourcing.
Supply support for 74ALVCH245MTCX 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 analog and power IC designer acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The ALVCH family was engineered specifically for low-voltage, high-speed bus interfacing in mixed-supply systems - emphasizing bushold reliability, EMI control, and JEDEC-compliant robustness over legacy 74-series variants.
FAQ
What is the maximum propagation delay of the 74ALVCH245MTCX at 3.3V supply?
The 74ALVCH245MTCX has a maximum propagation delay (tPHL/tPLH) of 3.6 ns when VCC = 3.0V to 3.6V, CL = 50 pF, and TA = −40°C to +85°C. This value is measured under worst-case loading and temperature conditions and ensures timing closure for high-speed bus applications up to approximately 278 MHz.
Does the 74ALVCH245MTCX require external pull-up resistors on its data inputs?
No, the 74ALVCH245MTCX does not require external pull-up resistors because it integrates active bushold circuitry on all A0–A7 and B0–B7 inputs. This feature maintains valid logic states on floating or unused inputs, eliminating board-level bias components and improving system reliability in modular or hot-plug scenarios.
What package type is used for the 74ALVCH245MTCX?
74ALVCH245MTCX uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, with 4.4 mm body width and 0.65 mm lead pitch. This package is distinct from the SOIC variant (74ALVCH245WM) and requires specific land pattern dimensions per Fairchild's mechanical drawings.
Can the 74ALVCH245MTCX operate at 1.8V supply voltage?
Yes, the 74ALVCH245MTCX is fully specified to operate at 1.8V ± 0.15V (i.e., 1.65V to 1.95V). At this voltage, it guarantees tPD ≤ 6.0 ns, bushold drive current ≥ ±25 µA, and VOL ≤ 0.45 V with IOL = 4 mA - enabling direct integration with 1.8V FPGAs and low-power microcontrollers.
Is the 74ALVCH245MTCX compliant with JEDEC latchup standards?
Yes, the 74ALVCH245MTCX conforms to JEDEC JED78 for latchup immunity. This certification confirms that the device will not enter destructive latchup under normal operating conditions or specified transient stresses, a critical requirement for industrial and automotive-adjacent applications.
74ALVCH245MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALVCH
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74ALVCH245MTCX FAQ
1.How can I place an order for 74ALVCH245MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALVCH245MTCX 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 74ALVCH245MTCX reliable?
The price and inventory of 74ALVCH245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH245MTCX is usually 5 days.
3.What payment methods are accepted for 74ALVCH245MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH245MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ALVCH245MTCX?
74ALVCH245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALVCH245MTCX 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 74ALVCH245MTCX?
For technical support, including 74ALVCH245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH245MTCX requirements.
6.How does Aetrix verify that 74ALVCH245MTCX is sourced from the original manufacturer or authorized distributors?
All 74ALVCH245MTCX 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 74ALVCH245MTCX meets industry standards.
7.What is the process for return or replacement of 74ALVCH245MTCX?
All 74ALVCH245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH245MTCX, 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 74ALVCH245MTCX part is unused and in its original packaging.
Return procedure for 74ALVCH245MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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