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onsemi 74LVTH16952MTDX
- Part No.:
- 74LVTH16952MTDX
- Manufacturer:
- onsemi
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LVTH16952MTDX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,826
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Product details
Overview
74LVTH16952MTDX from Fairchild Semiconductor is a low-voltage 16-bit registered transceiver with 3-STATE outputs, designed for bidirectional data flow between two 8-bit buses. It features separate clock (CPABn/CPBAn), clock enable (CEAn/CEBn), and output enable (OEABn/OEBAn) controls per register, bushold inputs eliminating external pull-ups, and ±32 mA/64 mA drive capability. It operates at 2.7–3.6 V while interfacing with 5 V TTL systems.
For engineers reviewing the 74LVTH16952MTDX datasheet, pinout, applications, or equivalent options, key selection criteria include bus isolation timing (tPLH ≤ 4.4 ns @ 3.3 V), bushold input drive requirements (±75 µA), live insertion support, and TSSOP-56 package compatibility with JEDEC MO-153.
Technical Context
The 74LVTH16952MTDX implements dual 8-bit back-to-back registers enabling synchronous bidirectional data transfer: A-register latches data from B-bus on CPABn, B-register latches from A-bus on CPBAn. Each register has independent CE and OE control, allowing selective directionality and high-impedance bus isolation.
Its bushold circuitry actively maintains input logic state without external resistors-critical for unused or floating data lines in hot-swap environments. The BiCMOS process delivers ABT-class speed (fMAX = 150 MHz) with LVT-level power efficiency (ICCZ = 0.19 mA when outputs disabled).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Enables operation in 3.3 V systems while tolerating supply variation. |
| Max Clock Frequency | 150 MHz - Supports high-speed synchronous bus bridging in memory or peripheral interfaces. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns @ 2.7 V - Ensures tight timing margins in 100+ MHz data paths. |
| Output Drive | −32 mA / +64 mA - Sinks sufficient current for driving multiple TTL loads or stubbed buses. |
| Bushold Input Current | ±75 µA @ VI = 0.8 V/2.0 V - Guarantees stable logic retention without external biasing components. |
| IOH/IOL Limits | VOH ≥ VCC − 0.2 V @ IOH = −100 µA; VOL ≤ 0.55 V @ IOL = 64 mA - Validates voltage compliance under full load. |
| Power-Up/Down Hi-Z | Glitch-free bus loading during supply ramp - Prevents spurious bus contention during system initialization. |
Pinout & Package
74LVTH16952MTDX is packaged in a 56-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1 mm wide, with 0.5 mm lead pitch. Pin 1 marked by notch or dot; thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | A-register data inputs | Accept 8-bit parallel data from A-side bus; sampled on rising edge of CPABn when CEAn = L. |
| B0–B7 | B-register data inputs | Accept 8-bit parallel data from B-side bus; sampled on rising edge of CPBAn when CEBn = L. |
| CPABn | A-register clock pulse (active-low) | Edge-triggered clock for A-register; LOW-to-HIGH transition latches B→A data when CEAn = L. |
| CPBAn | B-register clock pulse (active-low) | Edge-triggered clock for B-register; LOW-to-HIGH transition latches A→B data when CEBn = L. |
| CEAn, CEBn | Register clock enable (active-low) | Disable clock sampling independently per register; HIGH disables latch action regardless of clock edge. |
| OEABn, OEBAn | Output enable (active-low) | Control 3-STATE output drivers: LOW enables A/B outputs; HIGH places them in high-impedance state. |
| GND, VCC | Power terminals | Two dedicated GND pins (pins 28, 56); one VCC pin (pin 27) - supports low-noise decoupling layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold inputs | Eliminates need for 10 kΩ pull-up/pull-down resistors on A0–A15 and B0–B15, reducing BOM count and board space. |
| Live insertion/extraction | Power-up/down high-impedance behavior prevents bus contention during hot-plug operations in modular backplanes. |
| Independent byte control | Separate CPABn/CPBAn, CEAn/CEBn, and OEABn/OEBAn allow asymmetric data flow-e.g., A→B only while B→A is disabled. |
| TTL-compatible I/O | Accepts 0–5.5 V inputs and drives 5 V TTL loads, enabling seamless interfacing between 3.3 V logic and legacy 5 V subsystems. |
| Latch-up immunity | Complies with JEDEC JED78 - withstands >500 mA transient current without destructive latch-up. |
Applications
| Memory Subsystem Interface | Hot-Swappable Backplane Bridge |
|---|---|
|
Use Scenario: Interfacing a 3.3 V microcontroller bus to a 5 V SRAM or Flash memory array. IC Role / Device Role / Timing Role: Registered transceiver providing level-shifted, synchronized data transfer with clock-controlled write strobes. Use Value: Eliminates discrete level shifters and timing buffers; bushold holds address/data lines stable during MCU reset sequences. |
Use Scenario: Data routing between line cards and central switch fabric in telecom chassis with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional bus isolator with glitch-free power sequencing and independent byte enable for partial reconfiguration. Use Value: Enables safe card insertion/removal without disrupting active traffic on adjacent slots due to controlled Hi-Z transitions. |
| Industrial PLC I/O Expansion | Test Equipment Digital Pattern Generator |
|
Use Scenario: Extending digital I/O capacity of a 3.3 V FPGA-based controller to drive 5 V relay modules and optocouplers. IC Role / Device Role / Timing Role: Registered buffer with robust ESD protection (HBM >2000 V) and high-current drive for industrial noise immunity. Use Value: Directly drives 64 mA relay coils without external drivers; bushold prevents undefined states during firmware updates. |
Use Scenario: Generating precise, synchronized stimulus patterns for IC functional testing across mixed-voltage DUTs. IC Role / Device Role / Timing Role: Timing-critical pattern repeater with sub-5 ns propagation delay and skew <1.0 ns across all 16 outputs. Use Value: Maintains nanosecond-level timing correlation between stimulus channels, critical for setup/hold validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT16952MTD | No bushold inputs; requires external pull-ups on all data pins; identical timing, drive, and package. | Suitable where all inputs are actively driven; unsuitable for floating or undriven bus segments. | Select 74LVT16952MTD only if bushold functionality is unnecessary and cost minimization is prioritized. |
| SN74LVTH16952DGGR | Same function and bushold spec; TI version in 56-pin TSSOP (same MO-153 footprint); slightly higher ICCZ (0.25 mA). | Drop-in replacement in TI-centric designs; validated for automotive temp range (−40°C to +125°C). | Choose SN74LVTH16952DGGR when extended temperature operation or TI supply chain alignment is required. |
Compared with 74LVT16952MTD and SN74LVTH16952DGGR, the 74LVTH16952MTDX uniquely combines bushold-enabled reliability in floating-input scenarios with Fairchild's proven BiCMOS timing performance and industrial temperature rating, making it optimal for ruggedized embedded bus bridging.
Availability
74LVTH16952MTDX is available at Aetrix Electronics and suitable for memory subsystem interface, hot-swappable backplane bridge, and industrial PLC I/O expansion requiring stable component supply, long-term lifecycle support, and consistent TSSOP-56 packaging.
Supply support for 74LVTH16952MTDX 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 legacy logic portfolio remains widely deployed in industrial and communications infrastructure.
The 74LVTH16952MTDX belongs to Fairchild's LVT/H series of low-voltage BiCMOS transceivers, engineered specifically for high-speed, low-power bidirectional bus interfacing in mixed-voltage systems with demanding signal integrity requirements.
FAQ
What is the maximum operating frequency of the 74LVTH16952MTDX?
The 74LVTH16952MTDX supports a maximum clock frequency of 150 MHz across the full industrial temperature range (−40°C to +85°C), as specified in the AC Electrical Characteristics table under fMAX. This applies to both CPABn and CPBAn inputs with CL = 50 pF and VCC = 3.3 V ± 0.3 V. Performance is guaranteed-not just characterized-in the TSSOP package.
Does the 74LVTH16952MTDX require external pull-up resistors on its data inputs?
No, the 74LVTH16952MTDX does not require external pull-up resistors because it includes bushold circuitry on all data inputs (A0–A15 and B0–B15). This feature actively maintains the last valid logic state when inputs float, with minimum hold current of ±75 µA at 3.0 V, as confirmed in the DC Electrical Characteristics table.
Can the 74LVTH16952MTDX interface directly with 5 V TTL logic?
Yes, the 74LVTH16952MTDX supports direct 5 V TTL interfacing: its inputs tolerate up to 5.5 V (VI max), and its outputs drive standard TTL loads with VOH ≥ VCC − 0.2 V and VOL ≤ 0.55 V at full 64 mA sink. This allows seamless connection to 5 V peripherals without level-shifting circuitry.
What is the pin-compatible alternative to the 74LVTH16952MTDX in the same TSSOP-56 package?
The SN74LVTH16952DGGR from Texas Instruments is a functionally identical, pin-compatible alternative in the same 56-pin TSSOP package (JEDEC MO-153). It matches all electrical specs including bushold, drive strength, and timing, with minor differences in quiescent current (ICCZ = 0.25 mA vs. 0.19 mA) and extended temperature rating.
How does the 74LVTH16952MTDX handle power-up and power-down sequencing?
The 74LVTH16952MTDX provides glitch-free bus loading during power transitions: outputs enter high-impedance state automatically when VCC is below 1.5 V, preventing contention on shared buses. This behavior is verified in the Power Up/Down 3-STATE Output Current specification (IPU/PD = ±100 µA) and supports live insertion in backplane systems.
74LVTH16952MTDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
74LVTH16952MTDX FAQ
1.How can I place an order for 74LVTH16952MTDX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH16952MTDX 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 74LVTH16952MTDX reliable?
The price and inventory of 74LVTH16952MTDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH16952MTDX is usually 5 days.
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74LVTH16952MTDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH16952MTDX 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 74LVTH16952MTDX?
For technical support, including 74LVTH16952MTDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH16952MTDX requirements.
6.How does Aetrix verify that 74LVTH16952MTDX is sourced from the original manufacturer or authorized distributors?
All 74LVTH16952MTDX 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 74LVTH16952MTDX meets industry standards.
7.What is the process for return or replacement of 74LVTH16952MTDX?
All 74LVTH16952MTDX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH16952MTDX, 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 74LVTH16952MTDX part is unused and in its original packaging.
Return procedure for 74LVTH16952MTDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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