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STMicroelectronics 74LCX162244TTR
- Part No.:
- 74LCX162244TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LCX162244TTR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,117
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Product details
Overview
74LCX162244TTR from STMicroelectronics is a 16-bit non-inverting 3-state bus buffer with 5V-tolerant inputs/outputs, designed for 3.3V systems interfacing to 5V buses. It features 4.4 ns max propagation delay at VCC = 3V, ±12 mA output drive, 26Ω integrated series output resistors, and operates from 2.0V to 3.6V supply. Used in PCI bus interface, memory address driving, and high-speed backplane data routing.
For engineers reviewing the 74LCX162244TTR datasheet, 74LCX162244TTR pinout, 74LCX162244TTR application, or 74LCX162244TTR equivalent, key selection criteria include 5V tolerance compatibility, 3-state enable timing (tPZL/tPHZ ≤ 6.8 ns), symmetrical drive strength, on-die 26Ω termination, and TSSOP-48 thermal and layout constraints.
Technical Context
This device implements four independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (nG) input. All 16 outputs are 3-state capable, with simultaneous enable/disable control possible via tied nG inputs.
It integrates 26Ω series resistors per output to dampen transmission line reflections in high-speed PCB traces, and includes full power-down protection-inputs and outputs remain high-impedance and ESD-safe even when VCC = 0V. Input thresholds meet PCI bus voltage levels at 12 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 3.6V - supports 3.3V nominal operation with 1.5V data retention during low-power sleep |
| tPD (Max) | 4.4 ns at VCC = 3.0V - enables >100 MHz bus clocking with margin for trace delays |
| IOL / IOH | ±12 mA min at VCC = 3.0–3.6V - drives standard PCI loads without external buffers |
| Input/Output Voltage Tolerance | 0V to 5.5V - allows direct connection to legacy 5V logic without level shifters |
| Output Series Resistance | 26Ω integrated - reduces ringing and EMI on FR4 traces up to 15 cm without discrete termination |
| ESD Rating | HBM > 2000V, MM > 200V - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | −55°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
Pinout & Package
TSSOP-48 package: 12.6 mm × 8.1 mm body, 0.5 mm pitch, 1.2 mm height, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24, 25, 48 | nG (Output Enable) | Active-low control for 4-bit groups (1G→1Y1–1Y4; 2G→2Y1–2Y4; etc.) |
| 2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23, 26–27, 29–30, 32–33, 35–36, 37–38, 40–41, 43–44, 46–47 | Yn (Outputs) | 16 buffered, 3-state, 5V-tolerant outputs with 26Ω series resistance |
| 43–44, 46–47, 37–38, 40–41, 32–33, 35–36, 26–27, 29–30, 19–20, 22–23, 13–14, 16–17, 8–9, 11–12, 2–3, 5–6 | An (Inputs) | 16 5V-tolerant inputs with ±5 µA leakage and power-down protection |
| 4, 10, 15, 21, 28, 34, 39, 45 | GND | Eight ground pins distributed for low-inductance return paths and noise reduction |
| 7, 18, 31, 42 | VCC | Four dedicated VCC pins for balanced supply delivery and reduced IR drop |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Enables mixed-voltage system integration without external level translators |
| Integrated 26Ω series termination | Eliminates need for 16 discrete 27Ω resistors, saving PCB area and BOM cost |
| Symmetrical output drive | |IOH| = IOL = 12 mA ensures matched rise/fall times and reduced signal skew |
| Power-down protection | Inputs and outputs remain high-Z and non-destructive when VCC = 0V |
| Latch-up immunity | Exceeds 500 mA per JESD17 - robust against transient overcurrent events |
Applications
| PCI Bus Interface | Memory Address Driver |
|---|---|
Use Scenario: Interfacing 3.3V microcontroller peripherals to legacy 5V PCI slots in industrial PCs. IC Role / Device Role / Timing Role: Bidirectional 5V-tolerant buffer isolating core logic from noisy PCI bus transients. Use Value: Eliminates level-shifter ICs while maintaining <4.4 ns propagation delay for synchronous PCI timing compliance. | Use Scenario: Driving 16-bit address lines from low-voltage FPGA to 5V SRAM or flash memory arrays. IC Role / Device Role / Timing Role: Non-inverting 3-state address latch buffer with precise enable/disable timing control. Use Value: 6.8 ns max output disable time (tPHZ) ensures clean address hold before memory access cycles. |
| Backplane Data Routing | Industrial I/O Expansion |
Use Scenario: High-speed parallel data transfer across 15 cm FR4 backplane traces in modular PLC racks. IC Role / Device Role / Timing Role: On-die terminated bus driver minimizing reflection-induced jitter and bit errors. Use Value: Integrated 26Ω resistors suppress overshoot/undershoot, enabling reliable 80 Mbps parallel signaling. | Use Scenario: Isolating field-side 5V sensor/actuator signals from 3.3V controller I/O in factory automation modules. IC Role / Device Role / Timing Role: Fault-tolerant interface buffer with ESD-hardened inputs and power-down safe I/O. Use Value: HBM >2000V rating and zero-VCC protection prevent damage during hot-swap or cable disconnect events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit 3-state bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC162244ADGGR | Lower drive (±24 mA), no integrated series resistors, 1.65–3.6V VCC range | Requires external 27Ω termination for same signal integrity; better for ultra-low VCC designs | Select if higher drive or sub-2.0V operation needed; rework required for on-die termination benefit |
| 74ALVC162244PW | Higher speed (tPD = 3.3 ns), 2.3–3.6V VCC, no 5V tolerance on outputs | Not suitable for 5V bus driving; requires external clamping diodes for 5V input protection | Choose only for pure 3.3V systems where absolute minimum delay is critical and 5V tolerance is unnecessary |
Compared with SN74LVC162244ADGGR and 74ALVC162244PW, the 74LCX162244TTR uniquely combines 5V-tolerant I/O, integrated 26Ω termination, and guaranteed PCI-level drive at 3.3V-making it optimal for mixed-voltage backplane and legacy interface applications where signal integrity and compatibility are co-prioritized.
Availability
74LCX162244TTR is available at Aetrix Electronics and suitable for PCI bus interface, memory address driving, and industrial I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LCX162244TTR 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 solutions with broad analog, digital, and mixed-signal portfolios.
The 74LCX logic family targets low-voltage, high-speed 3.3V system interfacing with 5V legacy environments-designed specifically for PCI, backplane, and mixed-supply embedded applications demanding robustness and signal integrity.
FAQ
Is 74LCX162244TTR pin-compatible with standard 74-series 162244 devices?
Yes, it is pin- and function-compatible with the 74F/74AS/74ALS162244 families in TSSOP-48. Pin numbering, signal assignments, and truth table behavior match exactly-enabling drop-in replacement in existing 5V-tolerant 3.3V designs without layout changes.
Can 74LCX162244TTR operate safely with VCC = 0V while 5V signals are applied?
Yes. Its power-down protection ensures inputs and outputs remain in high-impedance state with no current flow or latch-up risk when VCC = 0V-even with 5.5V applied to any I/O pin. This enables hot-swap and partial-power-down system architectures.
What is the purpose of the 26Ω series resistors in the outputs?
The 26Ω resistors are monolithically integrated to provide source termination for controlled-impedance PCB traces (typically 50Ω). They reduce signal reflections, overshoot, and EMI in high-speed parallel buses-eliminating 16 discrete resistors and improving timing margin without external components.
Does 74LCX162244TTR support hot-plug operation in live backplanes?
Yes. With HBM >2000V ESD rating, power-down protection, and 5V-tolerant I/O, it withstands insertion transients and floating-bus conditions. Its 125°C max operating temperature and latch-up immunity (>500 mA) further ensure reliability in hot-plug industrial backplane environments.
74LCX162244TTR 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, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
74LCX162244TTR FAQ
1.How can I place an order for 74LCX162244TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX162244TTR 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 74LCX162244TTR reliable?
The price and inventory of 74LCX162244TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX162244TTR is usually 5 days.
3.What payment methods are accepted for 74LCX162244TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX162244TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX162244TTR?
74LCX162244TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX162244TTR 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 74LCX162244TTR?
For technical support, including 74LCX162244TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX162244TTR requirements.
6.How does Aetrix verify that 74LCX162244TTR is sourced from the original manufacturer or authorized distributors?
All 74LCX162244TTR 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 74LCX162244TTR meets industry standards.
7.What is the process for return or replacement of 74LCX162244TTR?
All 74LCX162244TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX162244TTR, 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 74LCX162244TTR part is unused and in its original packaging.
Return procedure for 74LCX162244TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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