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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74VCX2245MTCX

Name: 74VCX2245MTCX
Brand: onsemi
SKU: 74VCX2245MTCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX2245MTCX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74VCX2245MTCX.pdf

Description:: IC TXRX NON-INVERT 3.6V 20TSSOP

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Product details

Overview

74VCX2245MTCX from Fairchild Semiconductor is a low-voltage bidirectional transceiver IC with 3.6V-tolerant I/O, 1.4V–3.6V V_CC operation, 26Ω series resistors on B-port outputs, and 3-STATE control via OE and T/R inputs-used in memory address buffering, clock distribution, and bus-level signal translation between mixed-voltage domains.

For engineers reviewing the 74VCX2245MTCX datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (TSSOP-20), direction-controlled bidirectional data flow, 4.4 ns max A→B propagation delay at 3.3V, ±12 mA B-port drive, and Quiet Series™ EMI reduction for noise-sensitive digital interfaces.

Technical Context

The 74VCX2245MTCX implements an octal non-inverting bidirectional buffer with independent 3-STATE control per port, where T/R selects data direction (A↔B) and OE enables/disables both ports simultaneously into high-impedance state. Its advanced CMOS process supports live insertion and power-off high-Z behavior.

It integrates 26Ω series termination resistors exclusively on B-port outputs to suppress ringing and reduce EMI in high-speed trace-driven applications-no external resistors required on B-side lines. Input thresholds scale with V_CC (0.35×V_CC/0.65×V_CC), enabling robust interfacing across 1.4V–3.6V logic families.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.4V to 3.6V - Enables direct interface with 1.5V, 1.8V, 2.5V, and 3.3V systems without level shifters.
I/O Voltage Tolerance	Up to 3.6V - Allows safe connection to higher-voltage buses while powered from lower V_CC.
B-Port Output Drive	±12 mA @ 3.0V V_CC - Sufficient for driving moderate capacitive loads (e.g., 5–10 cm PCB traces + IC inputs).
A→B Propagation Delay	4.4 ns max @ 3.3V, CL = 30 pF - Supports >100 MHz data rates in point-to-point or lightly loaded bus configurations.
B-Port Series Resistance	26 Ω - Integrated source termination reduces signal reflections and dynamic ground bounce on B-side outputs.
Quiet Series™ EMI Reduction	Patented circuitry - Lowers simultaneous switching noise (SSN) and radiated emissions without sacrificing speed.
Power-Off High-Z	Inputs/outputs remain high-impedance when V_CC = 0V - Prevents back-driving and bus contention during hot-swap or partial-power-down.

Pinout & Package

74VCX2245MTCX uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with exposed pad not electrically connected. Pin spacing is 0.65 mm; body dimensions are 6.5 × 4.4 × 1.2 mm (L × W × H).

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-Low Output Enable	Drives both A and B ports into high-impedance when HIGH; must be pulled LOW to enable bidirectional data flow.
2 (A0)	Side-A I/O	Non-inverting bidirectional terminal; connects to local low-voltage bus (e.g., microcontroller address/data lines).
3 (A1)	Side-A I/O	Same as A0 - all A0–A7 share identical electrical characteristics and direction control.
4 (A2)	Side-A I/O	Part of octal A-port group; no internal pull-ups/pull-downs; requires external biasing if floating in Z-state.
5 (A3)	Side-A I/O	Used for parallel data path extension; supports same V_CC range and I/O tolerance as other A pins.
6 (A4)	Side-A I/O	Compatible with 1.4V–3.6V logic; input leakage ≤5 µA ensures minimal standby current impact.
7 (A5)	Side-A I/O	High-impedance state maintained during power-up/down when OE tied to V_CC via pull-up resistor (per Note 1).
8 (A6)	Side-A I/O	Supports live insertion - safe to connect/disconnect while system is powered.
9 (A7)	Side-A I/O	Final A-port line; matches B-port timing skew <0.75 ns (same-direction switching) for synchronous transfers.
10 (GND)	Ground Reference	Primary return path for V_CC and I/O currents; decoupling capacitor recommended within 5 mm.
11 (B7)	Side-B I/O	B-port output includes integrated 26 Ω series resistor; input accepts up to 3.6V regardless of V_CC.
12 (B6)	Side-B I/O	Same 26 Ω termination applies; VOL ≤0.8V @ IOL = 12 mA, 3.3V V_CC ensures solid LOW recognition.
13 (B5)	Side-B I/O	Dynamic peak VOL suppressed to 1.0V (typ) under 30 pF load - critical for clean clock edge integrity.
14 (B4)	Side-B I/O	Terminated output reduces need for external RC damping networks in DDR address/control routing.
15 (B3)	Side-B I/O	IOZ ≤10 µA in 3-STATE - prevents leakage-induced false logic states on shared B-bus lines.
16 (B2)	Side-B I/O	VIH min = 0.65×V_CC at 1.65–2.3V - accommodates slow-rising signals from legacy 3.3V drivers.
17 (B1)	Side-B I/O	VIL max = 0.35×V_CC at same range - rejects noise spikes up to 35% of V_CC without mis-triggering.
18 (B0)	Side-B I/O	Final B-line; tPZH/tPHZ ≤6.6 ns @ 3.3V ensures fast enable/disable for burst-mode bus arbitration.
19 (T/R)	Direction Control	LOW = B→A data flow; HIGH = A→B; transition must occur only when OE = LOW to avoid bus glitches.
20 (V_CC)	Supply Voltage	Accepts 1.4–3.6V; ICC ≤20 µA quiescent - suitable for battery-backed or ultra-low-power subsystems.

Key Features

Feature	Design Value
26 Ω B-port series termination	Eliminates need for eight discrete 26 Ω resistors on B-side PCB traces, reducing component count and layout area.
3.6V-tolerant I/O at any V_CC ≥1.4V	Enables direct connection to 3.3V peripherals (e.g., Flash, SRAM) while operating from 1.8V core supply - no external level translators.
Quiet Series™ noise suppression	Reduces dynamic ground bounce and radiated EMI by controlling slew rate and current dI/dt during switching transitions.
Live insertion support	Power-off high-Z and controlled turn-on sequence allow hot-plug capability in modular backplane or card-edge applications.
Scalable voltage thresholds	Input thresholds track V_CC (VIH/VIL = 0.65×/0.35×V_CC), ensuring reliable operation across full 1.4–3.6V supply range without recalibration.

Applications

Memory Address Buffering	Low-Voltage Clock Distribution
Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or NOR Flash device. IC Role / Device Role / Timing Role: Bidirectional transceiver translating logic levels while maintaining timing integrity across voltage domains. Use Value: 26 Ω B-port termination minimizes overshoot on 3.3V address bus, preventing setup/hold violations at SRAM inputs.	Use Scenario: Distributing a 50 MHz system clock from a 2.5V PLL to multiple 3.3V peripheral clocks with matched skew. IC Role / Device Role / Timing Role: Non-inverting buffer with sub-5 ns propagation delay and <0.75 ns output-to-output skew. Use Value: Quiet Series™ reduces jitter induced by simultaneous clock edge transitions, preserving phase margin in timing-critical paths.
PCI Express Sideband Signal Routing	Hot-Swappable Module Interface
Use Scenario: Isolating and conditioning sideband signals (e.g., PERST#, CLKREQ#) between 1.5V root complex and 3.3V endpoint cards. IC Role / Device Role / Timing Role: Level-shifting transceiver with 3.6V-tolerant inputs and power-off high-Z for safe signal isolation. Use Value: Eliminates risk of back-driving 1.5V logic during card removal, meeting PCIe hot-plug electrical requirements.	Use Scenario: Interfacing a 1.4V FPGA configuration bus to a 3.3V mezzanine card's control/status lines in telecom line cards. IC Role / Device Role / Timing Role: Bidirectional bus interface supporting live insertion and partial power-down sequencing. Use Value: OE-controlled 3-STATE and T/R direction logic enable deterministic bus arbitration during module hot-swap events.

Memory Address Buffering

Low-Voltage Clock Distribution

Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or NOR Flash device.

IC Role / Device Role / Timing Role: Bidirectional transceiver translating logic levels while maintaining timing integrity across voltage domains.

Use Value: 26 Ω B-port termination minimizes overshoot on 3.3V address bus, preventing setup/hold violations at SRAM inputs.

Use Scenario: Distributing a 50 MHz system clock from a 2.5V PLL to multiple 3.3V peripheral clocks with matched skew.

IC Role / Device Role / Timing Role: Non-inverting buffer with sub-5 ns propagation delay and <0.75 ns output-to-output skew.

Use Value: Quiet Series™ reduces jitter induced by simultaneous clock edge transitions, preserving phase margin in timing-critical paths.

PCI Express Sideband Signal Routing

Hot-Swappable Module Interface

Use Scenario: Isolating and conditioning sideband signals (e.g., PERST#, CLKREQ#) between 1.5V root complex and 3.3V endpoint cards.

IC Role / Device Role / Timing Role: Level-shifting transceiver with 3.6V-tolerant inputs and power-off high-Z for safe signal isolation.

Use Value: Eliminates risk of back-driving 1.5V logic during card removal, meeting PCIe hot-plug electrical requirements.

Use Scenario: Interfacing a 1.4V FPGA configuration bus to a 3.3V mezzanine card's control/status lines in telecom line cards.

IC Role / Device Role / Timing Role: Bidirectional bus interface supporting live insertion and partial power-down sequencing.

Use Value: OE-controlled 3-STATE and T/R direction logic enable deterministic bus arbitration during module hot-swap events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC2245APW,118	No integrated 26 Ω resistors on B-port; lower drive (±24 mA A-port only); 1.65–3.6V V_CC range.	Lacks built-in termination - requires external resistors for EMI control on B-side; better for high-drive A→B unidirectional use cases.	Select when higher A-port current (24 mA) is needed and B-side termination can be added externally.
SN74AVC2245RGYR	1.2–3.6V V_CC; no B-port series resistors; supports 12 mA drive on both ports; different pinout (24-pin VQFN).	Wider voltage range but no integrated termination; incompatible pinout prevents drop-in replacement; suited for ultra-low-voltage SoC interconnects.	Choose for sub-1.4V operation or when board layout allows re-routing for 24-pin package.

Compared with 74LVC2245APW,118 and SN74AVC2245RGYR, the 74VCX2245MTCX uniquely combines 26 Ω B-port termination, 1.4V minimum V_CC, and TSSOP-20 compatibility - making it optimal for space-constrained, noise-sensitive 1.8V/3.3V bus bridging where external resistors are undesirable.

Availability

74VCX2245MTCX is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, PCIe sideband routing, and hot-swappable module interfaces requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for 74VCX2245MTCX 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 VCX logic family emphasized low-voltage operation, noise immunity, and mixed-signal interoperability.

The 74VCX2245 belongs to Fairchild's VCX low-voltage CMOS logic product line, designed specifically for bidirectional signal translation between 1.4V–3.6V domains in space-constrained, EMI-sensitive digital systems such as networking equipment and portable computing.

FAQ

What is the maximum operating frequency supported by the 74VCX2245MTCX?

The 74VCX2245MTCX does not specify a maximum clock frequency in its datasheet, but its 4.4 ns max A→B propagation delay at 3.3V V_CC supports reliable data transfer up to approximately 100–125 MHz in point-to-point configurations with 30 pF load. System-level timing depends on trace length, fanout, and termination - actual usable frequency must be validated per board design.

Does the 74VCX2245MTCX require external pull-up or pull-down resistors on its control inputs?

Yes - the OE and T/R inputs have no internal biasing. To ensure defined logic states during power-up/power-down, OE should be tied to V_CC via a pull-up resistor (minimum value determined by driver strength), and T/R must be actively driven or externally biased. Floating control inputs may cause undefined bus states or increased ICC.

Can the 74VCX2245MTCX be used with a 1.5V supply voltage?

Yes - the 74VCX2245MTCX is fully specified for 1.4V to 3.6V V_CC operation. At 1.5V, it delivers ±1 mA B-port drive, VIH/VIL thresholds scale to ~0.525V/~0.225V, and propagation delay increases to ~16.8 ns (CL = 15 pF). All DC and AC parameters remain guaranteed per datasheet Tables 3–5.

How does the 26 Ω series resistance on the B outputs affect signal integrity?

The 26 Ω series resistance on each B-port output acts as source termination, matching typical PCB trace impedance (50–75 Ω) to suppress reflections, reduce ringing, and lower EMI. It lowers dynamic ground bounce and improves signal fidelity on unterminated or lightly loaded buses - especially beneficial for clock and address lines routed over >5 cm traces.

Is the 74VCX2245MTCX pin-compatible with the 74VCX2245MTC?

Yes - the 74VCX2245MTCX is the tape-and-reel version of the 74VCX2245MTC; both share identical TSSOP-20 (MTC20) package, pinout, electrical specifications, and thermal characteristics. The "X" suffix denotes packaging format only (reel vs. tube) and does not indicate functional or mechanical differences.

74VCX2245MTCX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VCX

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; 12mA, 12mA

Voltage - Supply:: 1.4V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

74VCX2245MTCX FAQ

1.How can I place an order for 74VCX2245MTCX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX2245MTCX 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 74VCX2245MTCX reliable?

The price and inventory of 74VCX2245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX2245MTCX is usually 5 days.

3.What payment methods are accepted for 74VCX2245MTCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX2245MTCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX2245MTCX?

74VCX2245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX2245MTCX 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 74VCX2245MTCX?

For technical support, including 74VCX2245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX2245MTCX requirements.

6.How does Aetrix verify that 74VCX2245MTCX is sourced from the original manufacturer or authorized distributors?

All 74VCX2245MTCX 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 74VCX2245MTCX meets industry standards.

7.What is the process for return or replacement of 74VCX2245MTCX?

All 74VCX2245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX2245MTCX, 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 74VCX2245MTCX part is unused and in its original packaging.

Return procedure for 74VCX2245MTCX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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