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STMicroelectronics 74VHCT16373ATTR
- Part No.:
- 74VHCT16373ATTR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74VHCT16373ATTR.pdf
- Description:
- IC LATCH 16-BIT D-TYPE 48-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
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Product details
Overview
74VHCT16373ATTR from STMicroelectronics is a 16-bit non-inverting D-type transparent latch with 3-state outputs, designed for bus interface and data buffering in 5V TTL-compatible systems. It features dual byte control (two LE and two OE inputs), 5.0 ns typical propagation delay at 5V, ±8 mA output drive, and operates across 4.5–5.5 V with 4 µA max quiescent current. Used in industrial control backplanes and memory address latching.
For engineers reviewing the 74VHCT16373ATTR datasheet, 74VHCT16373ATTR pinout, 74VHCT16373ATTR application, or 74VHCT16373ATTR equivalent, key selection criteria include latch enable timing (1 ns min hold time), 3-state output disable skew (<1.5 ns), input voltage tolerance up to 7V independent of VCC, and ESD immunity (2 kV HBM).
Technical Context
This device implements two independent 8-bit transparent latch sections, each with dedicated active-low latch enable (LE) and output enable (OE) controls. Data propagates from D to Q when LE is high; outputs freeze on LE low transition and enter high-impedance state when OE is high.
It uses sub-micron C2MOS technology with double-layer metal wiring, enabling balanced tPLH/tPHL delays (~5.5 ns typ), symmetrical output drive (|IOH| = IOL ≥ 8 mA), and power-down input protection allowing 0–7 V input acceptance regardless of VCC level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (LE→Q) | 5.0 ns typ @ 5V, CL=15 pF - enables fast bus handshaking in real-time control loops |
| Output Drive Strength | ±8 mA min - supports direct driving of 50 Ω transmission lines or multiple TTL loads |
| Supply Voltage Range | 4.5–5.5 V - ensures compatibility with regulated 5V rails and tolerates line ripple |
| Input Voltage Tolerance | 0–7 V independent of VCC - allows safe interfacing between 3.3V logic and 5V buses |
| Quiescent Current | 4 µA max @ 25°C - minimizes standby power in battery-backed or energy-sensitive systems |
| ESD Immunity | 2 kV HBM - protects against handling damage during PCB assembly and field service |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
TSSOP-48 package: 48-pin thin shrink small outline package with 0.5 mm pitch, 12.6 mm × 8.1 mm body, and 0.75 mm max height - optimized for high-density PCB layouts and automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | Active-low Output Enable (1OE, 2OE) | Controls 3-state output drivers per 8-bit bank; high = high-Z, low = enabled |
| 48, 25 | Active-low Latch Enable (1LE, 2LE) | Enables transparent mode (LE high) or latches data on falling edge (LE low) |
| 2–3, 5–6, 8–9, 11–12, 13–14, 16–17, 19–20, 22–23 | 3-State Outputs (1Q0–1Q7, 2Q0–2Q7) | Non-inverting latched data outputs; tri-stated when respective OE high |
| 36–35, 33–32, 30–29, 27–26, 47–46, 44–43, 41–40, 38–37 | Data Inputs (2D0–2D7, 1D0–1D7) | Asynchronous data inputs feeding respective latch banks |
| 4, 10, 15, 21, 28, 34, 39, 45 | GND | Eight ground connections distributed for low-inductance return paths and noise reduction |
| 7, 18, 31, 42 | VCC | Four power supply pins reduce IR drop and improve transient response across wide bus |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latch banks | Enables concurrent latching of two data bytes without inter-bank timing constraints |
| Input overvoltage tolerance (0–7 V) | Eliminates need for external level-shifting circuitry when interfacing mixed-voltage subsystems |
| Balanced tPLH/tPHL propagation | Reduces duty-cycle distortion in clocked data paths and simplifies timing margin analysis |
| Power-down input protection | Prevents back-powering and latch-up when VCC is off but inputs remain active |
| Low dynamic noise (VOLP ≤ 0.9 V) | Minimizes ground bounce and crosstalk in high-speed parallel bus applications |
Applications
| Industrial PLC Backplane Interface | Memory Address Latching |
|---|---|
Use Scenario: Isolating CPU address bus from peripheral expansion slots in modular programmable logic controllers. IC Role / Device Role / Timing Role: Transparent latch capturing stable address values during bus arbitration cycles; OE controlled by slot-select decoder. Use Value: Enables hot-plug compatible backplane design with deterministic 5.0 ns address setup and no bus contention during slot insertion/removal. | Use Scenario: Holding upper address bits for SRAM/Flash access in microcontroller-based embedded systems. IC Role / Device Role / Timing Role: Non-inverting latch freezing A8–A15 during instruction fetch; LE synchronized to memory enable signal. Use Value: Eliminates need for external glue logic while maintaining <10 ns address hold time required by 70 ns access time memories. |
| Automotive Body Control Module Bus Buffer | Test Equipment Digital Pattern Generator |
Use Scenario: Driving CAN transceiver address configuration lines and sensor multiplexer select signals in harsh automotive environments. IC Role / Device Role / Timing Role: Level-translating latch isolating 3.3V MCU GPIO from 5V sensor bus; powered from 5V rail with 125°C operation. Use Value: Survives load-dump transients and meets AEC-Q100 Grade 1 requirements without external TVS or voltage clamps. | Use Scenario: Generating synchronized multi-bit stimulus patterns for IC functional testing on ATE platforms. IC Role / Device Role / Timing Role: Parallel pattern register holding test vectors; OE toggled to pulse-strobe outputs onto DUT pins. Use Value: Achieves <1.5 ns inter-output skew across all 16 bits, ensuring simultaneous vector application critical for timing-sensitive DUT validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit transparent latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH16373A | Lower VCC range (1.65–3.6 V); 3.3V-only operation; 6.5 ns max tPD | Designed for modern low-voltage digital systems; not 5V-tolerant | Select when migrating to 3.3V core logic and requiring LVCMOS compatibility |
| 74ACT16373 | Higher drive (±24 mA); faster tPD (3.5 ns typ); no 7V input tolerance | Requires strict 5V supply; lacks power-down protection and mixed-voltage safety | Choose for maximum speed in legacy 5V-only designs where input overvoltage risk is absent |
Compared with SN74LVCH16373A and 74ACT16373, the 74VHCT16373ATTR uniquely combines 5V TTL compatibility, 7V input tolerance, and industrial temperature range-making it the only option suitable for retrofitting 5V systems requiring robust mixed-signal interfacing without redesign.
Availability
74VHCT16373ATTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and memory address latching requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT16373ATTR 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 vertical manufacturing capabilities and broad IP portfolio.
The VHCT logic family targets high-speed, low-power 5V CMOS applications requiring TTL compatibility and enhanced robustness-specifically engineered for industrial control, instrumentation, and legacy system upgrades.
FAQ
Can the 74VHCT16373ATTR operate with a 3.3V supply?
No. The device requires VCC between 4.5 V and 5.5 V per its recommended operating conditions. While inputs tolerate up to 7 V regardless of supply, the internal logic and output drive are specified only for 5V operation. Using 3.3V will result in undefined output levels and failure to meet AC timing specifications.
What is the maximum number of outputs that can be tied together in a wired-OR configuration?
None-wired-OR is not supported. All outputs are actively driven high or low (not open-drain), and connecting multiple 3-state outputs together without strict mutual exclusion causes bus contention and excessive current draw. Only one output-enable signal should be asserted at any time per shared bus segment.
Does the 74VHCT16373ATTR support hot insertion into a live 5V backplane?
Yes, due to its power-down input protection: inputs accept 0–7 V even when VCC = 0 V, preventing back-powering or latch-up during insertion. However, outputs remain in high-impedance until VCC stabilizes and OE is asserted, ensuring safe connection to an energized bus.
How does the 2 kV ESD rating impact PCB layout practices?
The 2 kV HBM rating reflects internal protection diodes-not system-level immunity. Layout must still follow standard ESD practices: minimize trace lengths to connectors, avoid floating conductors near I/O, use ground planes beneath signal layers, and place series resistors (33–100 Ω) close to pins for high-speed lines to dampen ringing and reduce coupled transients.
74VHCT16373ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHCT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 4.5V ~ 5.5V
- Independent Circuits:
- 2
- Delay Time - Propagation:
- 5.5ns
- Current - Output High, Low:
- 8mA, 8mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
74VHCT16373ATTR FAQ
1.How can I place an order for 74VHCT16373ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT16373ATTR 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 74VHCT16373ATTR reliable?
The price and inventory of 74VHCT16373ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT16373ATTR is usually 5 days.
3.What payment methods are accepted for 74VHCT16373ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT16373ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT16373ATTR?
74VHCT16373ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT16373ATTR 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 74VHCT16373ATTR?
For technical support, including 74VHCT16373ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT16373ATTR requirements.
6.How does Aetrix verify that 74VHCT16373ATTR is sourced from the original manufacturer or authorized distributors?
All 74VHCT16373ATTR 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 74VHCT16373ATTR meets industry standards.
7.What is the process for return or replacement of 74VHCT16373ATTR?
All 74VHCT16373ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT16373ATTR, 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 74VHCT16373ATTR part is unused and in its original packaging.
Return procedure for 74VHCT16373ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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