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onsemi 74ALVCH245MTC
- Part No.:
- 74ALVCH245MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ALVCH245MTC.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
74ALVCH245MTC from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with bushold inputs and 3-STATE outputs, designed for bus interface applications between 1.65V and 3.6V domains. It features direction control via T/R, output enable via active-low OE, and eliminates external pull-ups on A0–A7/B0–B7 inputs. Used in voltage-level translated data buses in industrial controllers and embedded communication modules.
For engineers reviewing the 74ALVCH245MTC datasheet, pinout, applications, or equivalent options, key selection criteria include VCC operating range (1.65–3.6V), propagation delay (3.6 ns max at 3.3V), bushold current specs, 3-STATE disable timing, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The 74ALVCH245MTC implements non-inverting bidirectional data flow controlled by a single T/R signal, with independent 3-STATE control via OE. Its bushold circuitry actively maintains valid logic levels on floating A/B port inputs without external resistors, reducing BOM count and layout complexity.
It operates across three VCC voltage bands-1.65–1.95V, 2.3–2.7V, and 2.7–3.6V-with distinct AC timing specifications per band. Propagation delay varies from 6.0 ns (1.8V) to 3.6 ns (3.3V), and output enable/disable times are specified down to 1.6 ns (tPZL) under loaded conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - supports mixed-voltage system interfacing including 1.8V, 2.5V, and 3.3V logic domains |
| tPD (max) | 3.6 ns at VCC = 3.3V - enables reliable operation in high-speed parallel bus systems up to ~140 MHz toggle rate |
| Bushold Drive Current | ±75 µA at VCC = 3.0V - sustains stable logic state on unconnected A/B pins without pull-up/pull-down resistors |
| IOH/IOL (max) | ±24 mA - drives standard CMOS loads and short traces without buffering in point-to-point or lightly loaded buses |
| tPZH/tPHZ (max) | 8.6 ns at VCC = 1.8V - defines worst-case 3-STATE disable latency during bus arbitration or power-gating transitions |
| Operating Temp | −40°C to +85°C - qualified for industrial temperature environments without derating |
Pinout & Package
74ALVCH245MTC 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 spacing and footprint match industry-standard TSSOP-20 layouts for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Drives both A and B ports into high-impedance when HIGH; enables bidirectional flow when LOW |
| 2–9 (A0–A7) | Side A I/O with Bushold | Bi-directional data terminals with integrated bushold - retain last valid logic state if left floating |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O current; must be low-impedance connection |
| 11–18 (B0–B7) | Side B I/O with Bushold | Bi-directional data terminals mirroring A-side behavior; electrically isolated but functionally coupled via T/R |
| 19 (T/R) | Direction Control Input | LOW = B→A data flow; HIGH = A→B data flow; sampled synchronously with OE assertion |
| 20 (VCC) | Power Supply | Single supply input for entire device; bypassing with 0.1 µF ceramic capacitor near pin required |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Eliminates need for 16 external pull-up resistors on A0–A7/B0–B7, reducing component count and board area |
| Quiet Series EMI Reduction | Patented slew-rate control minimizes simultaneous switching noise during 3-STATE transitions |
| Multi-Voltage Compatibility | Guaranteed AC/DC performance across 1.65V, 2.5V, and 3.3V rails - no level shifters needed for inter-domain bus bridging |
| JEDEC Latchup Compliance | Meets JED78 Class II latchup immunity - ensures robustness against transient-induced parasitic thyristor activation |
Applications
| Industrial PLC Backplane Interface | Low-Power Microcontroller Expansion Bus |
|---|---|
Use Scenario: Interfacing a 3.3V ARM Cortex-M4 MCU with legacy 2.5V or 1.8V peripheral modules on a shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data flow direction and isolation between mismatched logic families. Use Value: Enables direct connection without discrete level shifters; bushold prevents floating-bus glitches during reset or sleep transitions. | Use Scenario: Adding GPIO expansion to an ultra-low-power sensor hub operating at 1.8V, where unused pins must remain stable without external biasing. IC Role / Device Role / Timing Role: 8-bit I/O expander with auto-hold capability, used as a local bus buffer between host and peripheral ASICs. Use Value: Reduces standby current by eliminating 16 pull-up resistors; tPD ≤ 6 ns supports real-time sensor polling at >10 MHz burst rates. |
| Automotive Body Control Module | Test Equipment Digital I/O Card |
Use Scenario: Isolating CAN controller I/O from microcontroller GPIO banks in a 12V automotive body control unit with 3.3V logic domain. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver providing galvanic separation and voltage translation between subsystems. Use Value: −40°C to +85°C rating ensures reliability; bushold prevents undefined states during ignition cycling or brown-out events. | Use Scenario: Configurable digital stimulus/response channel in automated test equipment requiring fast, repeatable bus turnaround. IC Role / Device Role / Timing Role: High-speed bidirectional data path with sub-4 ns propagation and <9 ns 3-STATE disable for precise timing capture. Use Value: Enables deterministic read-after-write latency critical for boundary-scan and functional test pattern execution. |
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 in 20-pin VQFN (3.5 × 4.5 mm); slightly faster tPD (2.8 ns @ 3.3V); no bushold circuitry | Requires external pull-ups on unused I/Os; better suited for space-constrained layouts where thermal dissipation matters | Select when board area is critical and bushold is not required; verify VQFN reflow profile compatibility |
| 74LVC245ABQ | Nexperia part in 20-pin DHVQFN; includes bushold; wider VCC range (1.2–3.6V); higher ICC (20 µA vs. 10 µA) | Supports 1.2V interfaces; higher static current may impact battery-powered designs | Select for ultra-low-voltage operation or when DHVQFN footprint is already standardized in design |
Compared with SN74AVCH245RHLR and 74LVC245ABQ, the 74ALVCH245MTC offers proven bushold stability at 1.65V minimum VCC and JEDEC-standard TSSOP-20 packaging - ideal for industrial designs prioritizing legacy footprint compatibility and floating-input robustness over minimal package size.
Availability
74ALVCH245MTC is available at Aetrix Electronics and suitable for industrial PLC backplanes, low-power microcontroller expansion buses, and automotive body control modules requiring stable component supply, long-term lifecycle support, and consistent TSSOP-20 sourcing.
Supply support for 74ALVCH245MTC 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 manufacturer acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The ALVCH family was engineered for low-voltage, high-speed bus interfacing in mixed-supply systems - emphasizing bushold reliability, noise immunity, and JEDEC-compliant packaging for manufacturability.
FAQ
What is the minimum VCC voltage specification for reliable operation of the 74ALVCH245MTC?
The 74ALVCH245MTC is fully specified down to 1.65V VCC. At this voltage, DC parameters including VIH (0.65 × VCC), VOL (≤0.45V), and bushold hold current (≥25 µA) are guaranteed. Propagation delay increases to 6.0 ns max, and output drive strength reduces to ±4 mA at 1.65V - sufficient for short-trace, low-capacitance bus applications.
Does the 74ALVCH245MTC require external pull-up resistors on its A and B port pins?
No, the 74ALVCH245MTC does not require external pull-up or pull-down resistors on A0–A7 or B0–B7 due to integrated bushold circuitry. This feature actively maintains the last valid logic state on floating inputs, preventing undefined bus states during power-up, reset, or tri-state transitions - a key advantage over standard 74LVC or 74LV transceivers.
What is the maximum data rate supported by the 74ALVCH245MTC in a typical bus configuration?
The 74ALVCH245MTC supports effective data rates up to ~140 MHz in point-to-point configurations, derived from its 3.6 ns maximum propagation delay (tPD) at VCC = 3.3V. Real-world throughput depends on bus loading, termination, and 3-STATE transition timing; for heavily loaded or multidrop buses, derating to ≤50 MHz is recommended to maintain signal integrity.
How does the OE and T/R pin interaction affect bus control timing in the 74ALVCH245MTC?
In the 74ALVCH245MTC, OE is asynchronous and overrides T/R: when OE is HIGH, both A and B ports enter high-impedance regardless of T/R state. When OE is LOW, T/R determines direction - LOW enables B→A flow, HIGH enables A→B flow. Output enable/disable times (tPZL/tPLZ) are independent of T/R and defined relative to OE edges, ensuring predictable bus release timing during arbitration.
Is the 74ALVCH245MTC RoHS compliant and halogen-free?
Yes, the 74ALVCH245MTC manufactured under Fairchild's post-2006 production lines meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The MTC20 package uses matte tin lead finish and green molding compound. Legacy date codes may vary; current Aetrix stock carries full compliance documentation upon request.
74ALVCH245MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALVCH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 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
74ALVCH245MTC FAQ
1.How can I place an order for 74ALVCH245MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALVCH245MTC 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 74ALVCH245MTC reliable?
The price and inventory of 74ALVCH245MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH245MTC is usually 5 days.
3.What payment methods are accepted for 74ALVCH245MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH245MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ALVCH245MTC?
74ALVCH245MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALVCH245MTC 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 74ALVCH245MTC?
For technical support, including 74ALVCH245MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH245MTC requirements.
6.How does Aetrix verify that 74ALVCH245MTC is sourced from the original manufacturer or authorized distributors?
All 74ALVCH245MTC 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 74ALVCH245MTC meets industry standards.
7.What is the process for return or replacement of 74ALVCH245MTC?
All 74ALVCH245MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH245MTC, 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 74ALVCH245MTC part is unused and in its original packaging.
Return procedure for 74ALVCH245MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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