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onsemi 74ACTQ245MTCX
- Part No.:
- 74ACTQ245MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACTQ245MTCX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,525
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Product details
Overview
74ACTQ245MTCX from Fairchild Semiconductor is an octal bidirectional transceiver with 3-STATE inputs/outputs, designed for bus-oriented data transfer between two 8-bit buses. It operates at 4.5V–5.5V supply, delivers ±24 mA output drive, and features guaranteed pin-to-pin skew ≤1.0 ns at VCC = 5.0 V with CL = 50 pF. Used in backplane interface logic and memory address/data bus isolation.
For engineers reviewing the 74ACTQ245MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include quiet-output dynamic noise performance (VOLP ≤1.5 V), simultaneous switching immunity (VIHD ≥2.2 V, VILD ≤0.8 V at 5.0 V), and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
This device implements a non-inverting bidirectional buffer architecture controlled by separate Transmit/Receive (T/R) and Output Enable (OE) inputs. Direction control is level-sensitive: T/R = HIGH enables A→B data flow; T/R = LOW enables B→A flow; OE = HIGH forces both ports into high-impedance state.
Fairchild's FACT Quiet Series technology integrates GTO output control and undershoot correction with split ground bus routing to suppress simultaneous switching noise. Dynamic input thresholds (VIHD/VILD) and quiet-output voltage limits (VOLP/VOLV) are guaranteed per JEDEC MO-153 TSSOP package test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and rejects supply ripple within this range. |
| Output Drive | ±24 mA - Sinks or sources sufficient current to directly drive 50 pF bus loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 7.5 ns @ 5.0 V, CL = 50 pF - Enables reliable operation in 100+ MHz bus timing windows. |
| Output Skew | ≤ 1.0 ns - Guarantees deterministic timing alignment across all eight channels during parallel data transfer. |
| Quiet Output VOL | VOLP ≤ 1.5 V, VOLV ≥ 0.6 V @ 5.0 V - Defines dynamic low-level noise margin under worst-case simultaneous switching. |
| Dynamic Input Thresholds | VIHD ≥ 2.2 V, VILD ≤ 0.8 V @ 5.0 V - Specifies minimum HIGH and maximum LOW voltage levels that maintain noise-immune switching behavior. |
| Input Leakage | ≤ ±1.0 µA @ 5.5 V - Minimizes standby current draw and prevents unintended biasing in high-impedance bus states. |
Pinout & Package
Packaged in Pb-Free 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4 mm wide, with 0.65 mm lead pitch and exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH global disable: drives both A and B ports to high-impedance when asserted. |
| 2–9 (A0–A7) | Side A I/O Terminals | Bidirectional data lines; direction determined by T/R; 3-STATE when OE = HIGH or T/R conflicts with data flow. |
| 10 (GND) | Ground Reference | Primary signal return path; split ground bus design reduces ground bounce during switching. |
| 11–18 (B0–B7) | Side B I/O Terminals | Bidirectional data lines mirroring A-side behavior; electrically isolated from A-side except through transceiver core. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH selects A→B direction; active-LOW selects B→A direction; asynchronous to data edges. |
| 20 (VCC) | Power Supply | +4.5 V to +5.5 V supply; decoupling required within 10 mm of pin due to high di/dt during switching. |
Key Features
| Feature | Design Value |
|---|---|
| Quiet Series Output Control | GTO (Gate Turn-Off) circuitry actively suppresses overshoot/undershoot during edge transitions, reducing VOLP to ≤1.5 V. |
| Split Ground Bus Architecture | Dedicated ground routing minimizes shared-impedance coupling between outputs, lowering simultaneous switching noise by >50% vs. standard ACT245. |
| Guaranteed Pin-to-Pin Skew | ≤1.0 ns across all eight channels ensures deterministic setup/hold timing for synchronous bus protocols. |
| Enhanced Latch-Up Immunity | Rated to withstand ≥300 mA transient current, meeting JEDEC JESD78 Class II requirements for industrial environments. |
| Reduced ICC and IOZ | Quiescent supply current ≤40 µA and 3-STATE leakage ≤3.0 µA enable low-power hold states in battery-backed systems. |
Applications
| Memory Address Bus Isolation | Backplane Data Transfer |
|---|---|
Use Scenario: Isolating CPU address lines from peripheral memory modules to prevent contention during DMA cycles. IC Role / Device Role / Timing Role: Bidirectional address transceiver enabling time-multiplexed access between master and slave devices on shared address bus. Use Value: ±24 mA drive strength maintains signal integrity across 15 cm traces; 7.5 ns propagation delay supports 100 MHz address strobe timing. |
Use Scenario: Transferring 8-bit status or control data between line cards in modular telecom chassis. IC Role / Device Role / Timing Role: Hot-swap-capable bus interface providing direction-controlled data relay between independent power domains. Use Value: TSSOP-20 footprint allows dense backplane connector routing; QUIET Series noise suppression prevents false triggering in adjacent analog circuits. |
| Microcontroller I/O Expansion | Legacy Peripheral Interface |
Use Scenario: Extending GPIO count of an 8-bit MCU to drive multiple LED arrays or sensor banks via multiplexed bus. IC Role / Device Role / Timing Role: Level-shifting bidirectional I/O expander supporting mixed-voltage (3.3 V/5 V) subsystem interconnect. Use Value: VIHD ≥2.2 V and VILD ≤0.8 V ensure robust noise rejection in electrically noisy industrial enclosures. |
Use Scenario: Interfacing modern microcontrollers with legacy parallel peripherals (e.g., dot-matrix printers, EPROM programmers). IC Role / Device Role / Timing Role: Protocol-transparent data bridge synchronizing asynchronous handshaking signals between dissimilar logic families. Use Value: 3-STATE outputs allow safe bus sharing with other controllers; tPZL ≤9.5 ns enables fast enable/disable cycling during handshake arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245DBR | Standard ACT245 without Quiet Series noise suppression; VOLP not specified; tPLH/tPHL = 6.5 ns typical. | Lacks guaranteed dynamic noise margins; requires additional layout mitigation (guard traces, local decoupling) in high-noise environments. | Select when cost sensitivity outweighs simultaneous switching noise requirements and board space permits added filtering. |
| 74LVC245APW,118 | 3.3 V only (1.65–3.6 V); lower drive (±24 mA at 3.3 V); smaller TSSOP-20 (4.4 mm) but different pinout (OE on pin 19, T/R on pin 1). | Not voltage-compatible with 5 V systems; requires level translation if interfacing with legacy 5 V peripherals. | Select for new 3.3 V designs prioritizing ultra-low ICC (≤10 µA) and JEDEC-compliant 3.3 V I/O standards. |
Compared with SN74ACT245DBR and 74LVC245APW,118, the 74ACTQ245MTCX uniquely delivers factory-guaranteed quiet-output noise performance (VOLP/VOLV) and dynamic threshold immunity (VIHD/VILD) in a drop-in-compatible TSSOP-20 package for 5 V bus isolation where EMI control is critical.
Availability
74ACTQ245MTCX is available at Aetrix Electronics and suitable for memory address bus isolation, backplane data transfer, and microcontroller I/O expansion requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74ACTQ245MTCX 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 high-performance analog and logic ICs before its acquisition by ON Semiconductor in 2016; its legacy product lines remain widely deployed in industrial and telecom infrastructure.
The 74ACTQ245MTCX belongs to Fairchild's FACT Quiet Series logic family, engineered specifically for noise-critical bus interface applications where simultaneous switching noise must be minimized without sacrificing speed or drive strength.
FAQ
What is the operating voltage range for the 74ACTQ245MTCX?
The 74ACTQ245MTCX operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V TTL/CMOS logic families and provides margin against supply droop during high-current switching events. Operation outside this range is not guaranteed and may cause functional failure or increased ICC.
Does the 74ACTQ245MTCX support hot-swap operation?
The 74ACTQ245MTCX supports hot-swap operation when used with proper power sequencing: VCC must be stable before applying input signals, and OE should be held HIGH (disabled) until power is fully established. Its 3-STATE outputs and ±300 mA latch-up immunity help prevent damage during insertion, but no internal hot-swap controller is integrated.
How does the Quiet Series technology in the 74ACTQ245MTCX reduce noise?
The 74ACTQ245MTCX uses Fairchild's Quiet Series technology featuring GTO output control, undershoot correction circuitry, and a split ground bus. These elements collectively limit dynamic output noise (VOLP ≤1.5 V) and improve noise immunity (VIHD ≥2.2 V, VILD ≤0.8 V), verified under simultaneous switching test conditions per Figure 2 of the datasheet.
What is the maximum capacitive load the 74ACTQ245MTCX can drive?
The 74ACTQ245MTCX is characterized for CL = 50 pF, with propagation delays and skew specifications guaranteed under this load. While it can physically drive higher capacitance, timing parameters degrade beyond 50 pF-tPLH increases to ~10.5 ns at CL = 75 pF. For >50 pF loads, derating or buffering is recommended.
Is the 74ACTQ245MTCX pin-compatible with standard 74ACT245 devices?
Yes-the 74ACTQ245MTCX shares identical pinout, function mapping, and DC/AC electrical characteristics with standard 74ACT245 variants in TSSOP-20 (MTC20) package. The Quiet Series enhancements are implemented internally and do not alter pin assignment, logic behavior, or timing interface.
74ACTQ245MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74ACTQ245MTCX FAQ
1.How can I place an order for 74ACTQ245MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ245MTCX 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 74ACTQ245MTCX reliable?
The price and inventory of 74ACTQ245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ245MTCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ245MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ245MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ245MTCX?
74ACTQ245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ245MTCX 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 74ACTQ245MTCX?
For technical support, including 74ACTQ245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ245MTCX requirements.
6.How does Aetrix verify that 74ACTQ245MTCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ245MTCX 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 74ACTQ245MTCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ245MTCX?
All 74ACTQ245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ245MTCX, 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 74ACTQ245MTCX part is unused and in its original packaging.
Return procedure for 74ACTQ245MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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