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STMicroelectronics 74LCX16240TTR
- Part No.:
- 74LCX16240TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LCX16240TTR.pdf
- Description:
- IC BUFFER INVERT 3.6V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,267
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Product details
Overview
74LCX16240TTR from STMicroelectronics is a 16-bit inverting 3-state bus buffer with 5V-tolerant inputs/outputs, designed for 3.3V logic interfacing in mixed-voltage systems. It features 4.5 ns max propagation delay at VCC = 3V, ±24 mA output drive, 2.0–3.6V operating range, and pin/function compatibility with 74-series 16240. Used in PCI bus address/data buffering and memory subsystems requiring level translation.
For engineers reviewing the 74LCX16240TTR datasheet, 74LCX16240TTR pinout, 74LCX16240TTR application, or 74LCX16240TTR equivalent, key selection criteria include 5V tolerance, symmetrical 24 mA drive strength, TSSOP-48 package footprint, 3.3V-compatible timing, and 3-state enable control architecture.
Technical Context
This device implements four independent 4-bit inverting buffers, each controlled by a dedicated active-low output enable (nG) input. All 16 outputs are 3-state capable, with high-impedance behavior asserted when corresponding nG is HIGH.
It uses sub-micron C2MOS technology to achieve AC/ACT-family speed at 3.3V while maintaining 5V tolerance on all I/O pins. Input and output protection circuits ensure >2 kV HBM ESD immunity and latch-up immunity exceeding 500 mA per JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 4.5 ns max at VCC = 3.0–3.6V - enables high-speed 32-bit data path synchronization |
| Output Drive Strength | ±24 mA at VCC = 3.0–3.6V - supports direct driving of 50 Ω transmission lines or multiple CMOS loads |
| Operating Voltage Range | 2.0–3.6V (1.5V data retention) - compatible with battery-backed low-power hold modes |
| Input/Output Voltage Tolerance | 0–5.5V - allows safe interface to legacy 5V TTL/CMOS without external level shifters |
| Power-Down Leakage | 10 µA max at VI/VO = 5.5V - ensures minimal current draw during system suspend states |
| ESD Immunity | HBM > 2000V, MM > 200V - meets industrial handling requirements without additional protection circuitry |
| Output Skew | 1.0 ns max (tOSLH/tOSHL) - guarantees tight timing alignment across all 16 outputs |
Pinout & Package
TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm height. Pin 1 marked by beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24, 25, 48 | nG (Output Enable) | Active-low control per 4-bit group - enables/disables 4 outputs simultaneously |
| 2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23 | Yn (Inverted Output) | Complementary buffered output - drives inverted version of corresponding A input |
| 26–27, 29–30, 32–33, 35–36, 37–38, 40–41, 43–44, 46–47 | An (Data Input) | Non-inverting input - logic state determines Yn output polarity via inversion |
| 4, 10, 15, 21, 28, 34, 39, 45 | GND | Ground reference for all I/O and internal logic - requires low-inductance connection |
| 7, 18, 31, 42 | VCC | Primary power supply - must be decoupled locally with 100 nF ceramic capacitor per VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Supports direct connection to 5V buses without level-shifting components, reducing BOM count and layout complexity |
| Symmetrical Output Drive | IOH = IOL = 24 mA min - eliminates skew-induced timing margin loss in bidirectional data paths |
| Low Propagation Skew | ≤1.0 ns between any two outputs - critical for parallel bus integrity in high-speed memory interfaces |
| Power-Down Protection | Inputs/outputs remain high-impedance and non-latching when VCC = 0V - prevents back-driving of powered subsystems |
| PCI Bus Compliance | Guaranteed 24 mA drive at 3.3V - satisfies PCI Local Bus Specification signal integrity requirements |
Applications
| Memory Address Buffering | PCI Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a 3.3V microcontroller to 5V SRAM or Flash memory. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing voltage-level translation and bus contention control. Use Value: Eliminates need for discrete level shifters while maintaining <4.5 ns address setup time for 20+ MHz memory access. | Use Scenario: Interfacing a 3.3V host bridge controller to a 5V PCI slot environment. IC Role / Device Role / Timing Role: Bidirectional data/address buffer with 5V-tolerant I/O and PCI-compliant drive strength. Use Value: Meets PCI SIG electrical specifications for signal integrity and noise margin without external termination. |
| Backplane Signal Distribution | Industrial Control Bus Isolation |
Use Scenario: Fan-out of 3.3V control signals across a multi-slot backplane with mixed 3.3V/5V peripherals. IC Role / Device Role / Timing Role: Unidirectional inverting buffer enabling clean signal replication with matched rise/fall delays. Use Value: Balanced tPLH ≅ tPHL ensures consistent edge alignment across 16 parallel traces, minimizing skew-induced jitter. | Use Scenario: Isolating programmable logic outputs from field I/O modules operating at different supply voltages. IC Role / Device Role / Timing Role: 3-state gate controlling data flow between isolated voltage domains with robust ESD protection. Use Value: >2 kV HBM rating withstands industrial ESD events; power-down protection prevents fault propagation during hot-swap. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16240ADGGR | Lower max drive (±24 mA only at VCC ≥ 3.0V); no guaranteed 5V tolerance beyond 3.6V | Requires external clamping for 5V bus exposure; less robust in mixed-voltage hot-swap scenarios | Preferred where cost sensitivity outweighs 5V tolerance assurance |
| 74ALVC16240PW | Higher speed (tPD = 3.3 ns typ), but only 3.6V absolute max I/O voltage - not 5V tolerant | Not suitable for direct 5V bus connection; requires level-shifter for legacy interface | Select when maximum speed is required and system operates exclusively at ≤3.6V |
Compared with SN74LVC16240ADGGR and 74ALVC16240PW, the 74LCX16240TTR uniquely delivers verified 5V I/O tolerance with full 24 mA drive across its entire 2.0–3.6V supply range - making it the only option for unmodified 5V bus interfacing in industrial backplanes and PCI add-in cards.
Availability
74LCX16240TTR is available at Aetrix Electronics and suitable for memory subsystem design, PCI interface development, backplane signal distribution, and industrial control bus isolation requiring stable component supply and long-term lifecycle support.
Supply support for 74LCX16240TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal capabilities.
The 74LCX logic family was engineered specifically for low-voltage, high-speed 3.3V system interfacing with backward compatibility to 5V environments - targeting embedded controllers, telecom infrastructure, and industrial PLCs.
FAQ
Is 74LCX16240TTR pin-compatible with standard 74AC/74ACT16240?
Yes - it maintains identical pinout and functional mapping to 74-series 16240 devices, including the same 4-group output enable structure and inverted output behavior. The TSSOP-48 footprint matches industry-standard 74AC/ACT16240 packages, enabling drop-in replacement in existing layouts without redesign.
Can 74LCX16240TTR operate reliably at 2.0V supply?
Yes - the device is fully specified down to 2.0V VCC, with guaranteed 4.5 ns max propagation delay, ±24 mA drive at 3.0–3.6V, and ±12 mA at 2.7V. At 2.0V, DC parameters such as VIH/VIL remain valid, and dynamic performance meets industrial temperature range (-40°C to +125°C) requirements per datasheet Section 4.
What is the maximum capacitive load this device can drive at 3.3V?
Per AC Electrical Characteristics (page 5), the device is characterized with CL = 50 pF and RL = 500 Ω. Its 24 mA drive capability supports heavier loads - typical design practice limits total trace + load capacitance to ≤75 pF to maintain <5 ns delay and <1 ns skew, consistent with PCI bus loading guidelines.
Does 74LCX16240TTR require external pull-up or pull-down resistors on nG inputs?
No - the nG inputs have no internal pull resistors and exhibit ±5 µA leakage current. External biasing is required only if floating states must be avoided during power-up or reset; a 10 kΩ pull-down to GND ensures default high-impedance output state, matching typical system initialization requirements.
74LCX16240TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
74LCX16240TTR FAQ
1.How can I place an order for 74LCX16240TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX16240TTR 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 74LCX16240TTR reliable?
The price and inventory of 74LCX16240TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX16240TTR is usually 5 days.
3.What payment methods are accepted for 74LCX16240TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX16240TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX16240TTR?
74LCX16240TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX16240TTR 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 74LCX16240TTR?
For technical support, including 74LCX16240TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX16240TTR requirements.
6.How does Aetrix verify that 74LCX16240TTR is sourced from the original manufacturer or authorized distributors?
All 74LCX16240TTR 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 74LCX16240TTR meets industry standards.
7.What is the process for return or replacement of 74LCX16240TTR?
All 74LCX16240TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX16240TTR, 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 74LCX16240TTR part is unused and in its original packaging.
Return procedure for 74LCX16240TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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