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onsemi MC74LCX16240DTR2
- Part No.:
- MC74LCX16240DTR2
- Manufacturer:
- onsemi
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
MC74LCX16240DTR2.pdf
- Description:
- IC BUFFER INVERT 3.6V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,466
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Product details
Overview
MC74LCX16240DTR2 from onsemi is a low-voltage CMOS 16-bit inverting buffer with 5 V-tolerant inputs/outputs, operating from 2.3 V to 3.6 V supply. It features nibble-level 3-state control (four independent OE inputs), ±24 mA output drive, 5.5 V absolute input voltage rating, and TTL/LVCMOS compatibility - used for memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the MC74LCX16240DTR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance with 2.3–3.6 V core operation, nibble-selectable 3-state control, high-impedance IOFF behavior at VCC = 0 V, and TSSOP-48 packaging for space-constrained bus interfaces.
Technical Context
The MC74LCX16240DTR2 implements sixteen identical inverting buffers partitioned into four independent 4-bit nibbles, each controlled by its own Output Enable (OE1–OE4) input. Each nibble operates autonomously: when its OE is LOW, corresponding outputs (O0–O3, O4–O7, etc.) invert and drive Dn inputs; when HIGH, outputs enter high-impedance state.
Its 5.5 V-rated inputs enable safe interfacing with legacy 5 V TTL systems while powered from 2.3–3.6 V supplies. The device guarantees IOFF ≤ 10 µA at VCC = 0 V, supporting live insertion, and exhibits balanced ±24 mA sink/source capability at VCC ≥ 3.0 V with propagation delays as low as 1.5 ns (VCC = 3.3 V, CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables direct integration into 2.5 V or 3.3 V logic domains without level shifters |
| Input Voltage Max | 5.5 V - allows connection to 5 V TTL outputs without external clamping or translation |
| Output Drive | ±24 mA at VCC = 3.0–3.6 V - supports driving multiple LVTTL loads or moderate PCB trace capacitance |
| IOFF Leakage | ≤10 µA at VCC = 0 V - ensures true high-impedance isolation during hot-swap or power-down sequences |
| tPLH/tPHL | 1.5 ns min / 5.4 ns max (VCC = 3.3 V, CL = 50 pF) - meets timing budgets for high-speed address/data bus buffering |
| Quiescent ICC | 10 µA typical - minimizes standby power in battery-backed or always-on memory subsystems |
| ESD Rating | HBM >2000 V - provides robustness against handling-induced electrostatic discharge in assembly environments |
Pinout & Package
TSSOP-48 package (Case 1201), 0.5 mm pitch, 12.5 mm × 6.1 mm body size, lead-free (G suffix), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE1–OE4 (Pins 1, 47, 24, 25) | Nibble Output Enable Inputs | Active-LOW per 4-bit group - enables selective 3-state control of O0–O3, O4–O7, O8–O11, O12–O15 independently |
| D0–D15 (Pins 2–3, 5–6, 9–10, 12–13, 16–17, 19–20, 22–23, 26–27, 29–30, 32–33, 35–36, 39–40, 42–43, 45–46) | Data Inputs | Inverted logic inputs - each drives corresponding output with polarity inversion and 5.5 V tolerance |
| O0–O15 (Pins 2–3, 5–6, 9–10, 12–13, 16–17, 19–20, 22–23, 26–27, 29–30, 32–33, 35–36, 39–40, 42–43, 45–46) | 3-State Outputs | 5 V-tolerant, ±24 mA capable, high-impedance when respective OE is HIGH |
| VCC (Pins 7, 18, 30, 41) | Power Supply | Four dedicated VCC pins reduce IR drop and improve noise immunity across wide bus |
| GND (Pins 4, 10, 15, 21, 38, 44) | Ground | Six GND pins provide low-inductance return paths for all 16 outputs and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant I/O | Supports mixed-voltage system integration - 5 V signals can directly drive inputs while device runs at 2.5 V or 3.3 V |
| Nibble-selectable 3-state | Enables partial bus isolation - e.g., disable only upper address nibble during DMA cycles without affecting lower bits |
| IOFF protection | Guarantees <10 µA leakage when VCC = 0 V - prevents back-powering and signal contention during hot-plug events |
| Low dynamic power | CPD = 20 pF - reduces switching current and EMI in high-frequency bus applications |
| Latchup immunity | >500 mA - meets JEDEC JESD78 requirements for robust operation in noisy industrial environments |
Applications
| Memory Address Buffering | Backplane Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address lines from a low-voltage microcontroller to SRAM or Flash memory operating at 5 V. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing voltage-level translation and bus isolation between 2.5 V CPU and 5 V memory subsystem. Use Value: Eliminates need for discrete level shifters; 5.5 V input rating accepts 5 V address signals safely; nibble control allows partial address gating during page-mode access. | Use Scenario: Isolating and buffering parallel data buses between two PCBs in a modular telecom chassis with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent nibble enables, supporting controlled bus segment activation/deactivation. Use Value: IOFF specification prevents backfeeding during card insertion/removal; TSSOP-48 footprint fits dense backplane routing; ±24 mA drive sustains signal integrity over 10 cm traces. |
| Industrial PLC I/O Expansion | Legacy System Interface Adapter |
Use Scenario: Interfacing a modern 3.3 V FPGA I/O bank to legacy 5 V TTL-based sensor/actuator modules in programmable logic controllers. IC Role / Device Role / Timing Role: Level-translating buffer with configurable 4-bit segments for isolated control of digital I/O groups. Use Value: Four OE inputs allow independent enable/disable of sensor read, actuator write, status feedback, and interrupt lines - reducing software overhead and improving fault containment. | Use Scenario: Retrofitting a 5 V ISA-bus peripheral into a 3.3 V embedded host system requiring full bus compatibility. IC Role / Device Role / Timing Role: 16-bit inverting transceiver providing electrical interface compliance and timing margin for legacy bus protocols. Use Value: Propagation delay ≤5.4 ns (3.3 V) meets ISA setup/hold timing; 5 V tolerance avoids redesign of existing 5 V peripheral boards; TSSOP-48 matches standard socket footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16240ADGGR | Same 16-bit inverting 3-state architecture, but rated for 1.65–3.6 V VCC; 5 V tolerance confirmed; slightly higher tPZH (6.5 ns vs 5.4 ns) | Lower minimum VCC enables 1.8 V system integration; identical TSSOP-48 footprint | Preferred when operating below 2.3 V or requiring TI's qualification profile |
| 74ALVC16240PW | 16-bit inverting buffer with 1.65–3.6 V range and 5 V tolerance; AC specs similar; IOFF not explicitly guaranteed at VCC = 0 V | Lacks documented IOFF spec - less suitable for live-insertion systems requiring zero back-current | Select when cost sensitivity outweighs hot-swap requirement and layout allows minor timing margin adjustment |
Compared with SN74LVC16240ADGGR and 74ALVC16240PW, the MC74LCX16240DTR2 offers superior IOFF assurance for hot-swap, tighter propagation delay consistency across voltage range, and proven latchup immunity (>500 mA), making it optimal for industrial backplanes and memory subsystems demanding reliability under voltage mismatch.
Availability
MC74LCX16240DTR2 is available at Aetrix Electronics and suitable for memory address driving, backplane bus transceivers, industrial PLC I/O expansion, and legacy system interface adapters requiring stable component supply and long-term industrial availability.
Supply support for MC74LCX16240DTR2 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX16240DTR2 belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-voltage system interfacing where 2.3–3.6 V core logic must reliably communicate with legacy 5 V TTL infrastructure.
FAQ
What is the maximum input voltage rating for MC74LCX16240DTR2?
The MC74LCX16240DTR2 supports DC input voltages up to 5.5 V, enabling direct connection to 5 V TTL outputs without external protection circuitry. This rating is absolute - exceeding it risks permanent damage. The device maintains full functionality across its 2.3–3.6 V VCC range while accepting 5 V inputs, making MC74LCX16240DTR2 ideal for voltage-level bridging in mixed-supply systems.
Does MC74LCX16240DTR2 support hot-plug operation?
Yes, MC74LCX16240DTR2 supports live insertion and withdrawal due to its guaranteed IOFF leakage ≤10 µA when VCC = 0 V. This ensures outputs remain in high-impedance state with negligible back-current, preventing bus contention or damage during card replacement. The feature is validated per JEDEC standards and explicitly cited in the datasheet under "Features".
How many independent output enable controls does MC74LCX16240DTR2 have?
The MC74LCX16240DTR2 has four independent Output Enable inputs (OE1–OE4), each controlling a 4-bit nibble (O0–O3, O4–O7, O8–O11, O12–O15). This allows granular bus segmentation - for example, disabling only the upper address nibble during memory refresh while keeping lower bits active. Pins OE1, OE2, OE3, and OE4 are located at positions 1, 47, 24, and 25 respectively in the TSSOP-48 package.
What is the output drive strength of MC74LCX16240DTR2 at 3.3 V supply?
At VCC = 3.3 V, the MC74LCX16240DTR2 delivers ±24 mA output current - both sink (IOL) and source (IOH) - ensuring robust driving of multiple LVTTL loads or moderate capacitive bus traces. This value is specified in the "RECOMMENDED OPERATING CONDITIONS" table and verified across temperature (−40°C to +85°C), confirming MC74LCX16240DTR2's suitability for noise-sensitive industrial bus applications.
Is MC74LCX16240DTR2 RoHS compliant and lead-free?
Yes, MC74LCX16240DTR2 is Pb-free, halogen-free/BFR-free, and RoHS compliant, as confirmed by the "G" suffix in its marking (M74LCX16240DTR2G) and explicit statement in the datasheet's "Features" section. The device meets EU Directive 2011/65/EU and is suitable for environmentally regulated markets including automotive and industrial equipment sold in the EU and China.
MC74LCX16240DTR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
MC74LCX16240DTR2 FAQ
1.How can I place an order for MC74LCX16240DTR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX16240DTR2 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 MC74LCX16240DTR2 reliable?
The price and inventory of MC74LCX16240DTR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX16240DTR2 is usually 5 days.
3.What payment methods are accepted for MC74LCX16240DTR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX16240DTR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX16240DTR2?
MC74LCX16240DTR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX16240DTR2 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 MC74LCX16240DTR2?
For technical support, including MC74LCX16240DTR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX16240DTR2 requirements.
6.How does Aetrix verify that MC74LCX16240DTR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX16240DTR2 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 MC74LCX16240DTR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX16240DTR2?
All MC74LCX16240DTR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX16240DTR2, 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 MC74LCX16240DTR2 part is unused and in its original packaging.
Return procedure for MC74LCX16240DTR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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