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NXP Semiconductors 74LVT16646ADGG,118
- Part No.:
- 74LVT16646ADGG,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LVT16646ADGG,118.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,894
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Product details
Overview
74LVT16646ADGG,118 from Nexperia is a 3.3 V, 16-bit non-inverting bus transceiver with 3-state outputs in both directions, featuring dual clock (CPAB/CPBA), direction (DIR), and select (SAB/SBA) controls for bidirectional data routing between two 16-bit buses. It supports 5 V-tolerant I/O, delivers ±64 mA output drive, and operates from −40 °C to +85 °C in TSSOP56 packaging - used in high-speed backplane and memory interface applications.
For engineers reviewing the 74LVT16646ADGG,118 datasheet, 74LVT16646ADGG,118 pinout, 74LVT16646ADGG,118 application, or 74LVT16646ADGG,118 equivalent, this page provides verified functional architecture, real-time vs. stored data transfer timing, bus-hold input behavior, 3-state enable/disable delays, and precise voltage-level compatibility with mixed 3.3 V/5 V system interconnects.
Technical Context
The 74LVT16646ADGG,118 implements dual 8-bit register banks per side (A/B), each controlled by independent clock inputs (CPAB/CPBA) and select lines (SAB/SBA) to route either real-time or latched data. Its BiCMOS design enables TTL-compatible switching levels while operating at 3.3 V supply.
Direction control (DIR) determines data flow path (A→B or B→A), while output enable (OE) gates all 32 I/Os into high-impedance state. Bus-hold circuitry on all data pins eliminates external pull-ups, and live insertion/extraction is supported due to power-up 3-state and latch-up protection exceeding 500 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - ensures stable operation across industrial-grade voltage tolerance; 3.3 V nominal enables compatibility with LVT logic families. |
| Max Clock Frequency | 150 MHz at VCC = 3.3 V - supports high-throughput data transfers in memory buffers and FPGA I/O expansion. |
| Propagation Delay | 0.5–3.7 ns (tPLH/tPHL, CL = 50 pF) - guarantees sub-4 ns latency for time-critical bus arbitration and synchronous handshaking. |
| Output Drive | +64 mA sink / −32 mA source - drives heavy capacitive loads (e.g., long traces, multiple receivers) without signal degradation. |
| I/O Voltage Tolerance | Input/output rated to 5.5 V - allows direct interfacing with legacy 5 V systems without level-shifting components. |
| Bus-Hold Current | ±75 µA to ±140 µA (VI = 0.8 V / 2.0 V) - actively maintains valid logic states on floating data lines, eliminating need for external biasing. |
| ESD Protection | MIL-STD-883 >2000 V, Machine Model >200 V - withstands handling and board-level electrostatic discharge in automated assembly environments. |
Pinout & Package
TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, body width 6.1 mm, lead pitch 0.5 mm, maximum height 1.2 mm - optimized for high-density PCB layouts with thermal and mechanical reliability in reflow-soldered applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 28DIR | Direction control inputs (bits 0–7 / 8–15) | Determines data flow direction: DIR = HIGH enables A→B; DIR = LOW enables B→A - decoupled per half-bank for flexible partitioning. |
| 1OE, 2OE | Output enable inputs (bits 0–7 / 8–15) | Active-LOW control: OE = LOW enables I/O drivers; OE = HIGH forces 3-state - supports cascaded enable sequencing across multiple devices. |
| 1CPAB, 2CPAB | Clock inputs A→B (bits 0–7 / 8–15) | Latches real-time data from bus A into internal registers on LOW-to-HIGH transition - enables synchronous capture aligned to system clock domain. |
| 1CPBA, 2CPBA | Clock inputs B→A (bits 0–7 / 8–15) | Latches real-time data from bus B into internal registers on LOW-to-HIGH transition - supports full-duplex buffered communication. |
| 1SAB, 2SAB | Select inputs A→B (bits 0–7 / 8–15) | Chooses data source for A→B output: SAB = LOW passes real-time A data; SAB = HIGH selects stored A data - enables multiplexed bus sharing. |
| 1SBA, 2SBA | Select inputs B→A (bits 0–7 / 8–15) | Chooses data source for B→A output: SBA = LOW passes real-time B data; SBA = HIGH selects stored B data - critical for ping-pong buffering. |
| 1A0–1A7, 2A0–2A7 | Data I/O pins, bus A side (16 total) | Bidirectional interface to primary system bus - supports simultaneous read/write when paired with direction-controlled B-side I/Os. |
| 1B0–1B7, 2B0–2B7 | Data I/O pins, bus B side (16 total) | Bidirectional interface to secondary bus (e.g., peripheral, memory, or FPGA side) - electrically isolated via 3-state control during inactive cycles. |
| VCC (pins 7, 22, 35) | Positive supply voltage | Three dedicated VCC pins reduce supply impedance and improve noise immunity across the wide 56-pin array. |
| GND (pins 4, 11, 18, 25, 32, 39, 46, 53) | Ground reference | Eight GND pins distributed across package perimeter minimize ground bounce and ensure stable reference for high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit universal bus interface | Supports bidirectional data transfer between two independent 16-bit buses with configurable real-time or stored data routing per channel group. |
| Bus-hold inputs | Eliminates external pull-up resistors on all 32 data lines - reduces BOM count, PCB area, and risk of floating inputs in unpopulated or hot-plug scenarios. |
| Live insertion/extraction | Power-up 3-state and robust ESD/latch-up protection allow safe hot-swap in modular backplanes and field-replaceable units without system reset. |
| 5 V-tolerant I/O | Accepts 0–5.5 V input signals and drives 5 V buses directly - enables seamless integration into mixed-voltage systems without discrete level shifters. |
| High-current 3-state outputs | Delivers up to +64 mA sink current per pin - sustains signal integrity driving long traces, high-capacitance loads, or multiple downstream receivers. |
Applications
| Memory Interface Buffer | FPGA I/O Expansion |
|---|---|
|
Use Scenario: Interfacing a 3.3 V microcontroller to a 5 V SRAM or Flash memory bank with strict timing margins. IC Role / Device Role: Bidirectional data buffer with clocked storage and real-time pass-through modes to align memory access cycles with controller timing. Use Value: Eliminates external level shifters and reduces propagation delay to ≤3.7 ns, enabling reliable 150 MHz memory read/write bursts. |
Use Scenario: Extending I/O count of a Spartan-7 FPGA to drive legacy 5 V peripherals while maintaining 3.3 V core logic. IC Role / Device Role: Programmable bus transceiver configured via FPGA GPIOs to manage direction, clock, and select signals dynamically. Use Value: Bus-hold inputs prevent floating states during FPGA configuration; 5 V-tolerant I/O avoids additional voltage translation ICs. |
| Backplane Data Router | Industrial PLC Bus Coupler |
|
Use Scenario: Isolating and synchronizing data between two 16-bit parallel buses in a modular rack-based test system. IC Role / Device Role: Dual-clock, dual-select transceiver enabling ping-pong buffering and deterministic latency-controlled data forwarding. Use Value: Independent CPAB/CPBA and SAB/SBA controls allow overlapping store-and-forward operations - increasing effective throughput by 2×. |
Use Scenario: Connecting a 3.3 V ARM-based PLC CPU module to a 5 V I/O terminal block with hot-swap capability. IC Role / Device Role: Robust interface IC with live insertion support, bus-hold, and 500 mA latch-up immunity for harsh industrial environments. Use Value: Withstands repeated hot-plug events and ESD exposure per IEC 61000-4-2; operates continuously from −40 °C to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ALVCH16646PAG | Lower ICC (20 µA typical), same 3.3 V supply, but only 125 MHz max frequency and no bus-hold inputs. | Suitable for low-power, lower-speed applications where external pull-ups are acceptable and timing margin is relaxed. | Choose when power consumption is prioritized over speed and bus-hold functionality is not required. |
| SN74LVC16646AQPWREP | Automotive-grade (−40 °C to +125 °C), identical pinout and function, but higher ICC (100 µA) and slightly longer tPLH (2.2 ns min). | Required for AEC-Q100 qualified automotive control modules where extended temperature range is mandatory. | Choose for automotive applications needing qualification; otherwise, 74LVT16646ADGG,118 offers better speed/power trade-off for industrial use. |
Compared with 74ALVCH16646PAG and SN74LVC16646AQPWREP, the 74LVT16646ADGG,118 delivers superior 150 MHz performance and integrated bus-hold, making it optimal for high-speed industrial backplanes where timing precision and layout simplicity are critical - without requiring automotive qualification or ultra-low quiescent current.
Availability
74LVT16646ADGG,118 is available at Aetrix Electronics and suitable for memory interface buffers, FPGA I/O expansion, backplane data routers, and industrial PLC bus couplers requiring stable component supply across extended temperature ranges and mixed-voltage interoperability.
Supply support for 74LVT16646ADGG,118 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
Nexperia is a global semiconductor expert focused on high-performance discrete, logic, and PowerMOS devices for automotive, industrial, computing, and consumer markets - spun off from NXP's Standard Products division in 2017.
The 74LVT16646ADGG,118 belongs to Nexperia's LVT logic family, engineered for high-speed 3.3 V system interconnects with 5 V tolerance and robust bus management - targeting applications demanding deterministic latency, hot-swap resilience, and minimal external components.
FAQ
What is the maximum operating frequency of the 74LVT16646ADGG,118?
The 74LVT16646ADGG,118 supports a maximum clock frequency of 150 MHz at VCC = 3.3 V ± 0.3 V, as specified in Table 8 of the datasheet under dynamic characteristics. This applies to both CPAB and CPBA inputs when driving 50 pF loads with 2.5 ns rise/fall times. At 2.7 V supply, the guaranteed minimum is not specified, though typical operation remains functional below 150 MHz.
Does the 74LVT16646ADGG,118 support 5 V logic inputs while powered at 3.3 V?
Yes, the 74LVT16646ADGG,118 features 5 V-tolerant inputs: VI is rated from 0 V to 5.5 V under recommended operating conditions (Table 6), and absolute maximum input voltage is +7.0 V (Table 5). This allows direct connection to 5 V signal sources without level-shifting circuitry, even when VCC = 3.3 V.
How does bus-hold functionality work on the 74LVT16646ADGG,118?
The 74LVT16646ADGG,118 integrates bus-hold circuitry on all 32 data I/O pins (A0–A15, B0–B15). When an input floats near 0.8 V or 2.0 V, the device supplies ±75 µA to ±140 µA (Table 7) to reinforce the last-valid logic state - preventing metastability and eliminating need for external pull-up/pull-down resistors.
What is the purpose of the SAB and SBA pins on the 74LVT16646ADGG,118?
The SAB (select A→B) and SBA (select B→A) pins determine whether real-time or stored data appears on the respective output bus. For example, when SAB = HIGH, the 74LVT16646ADGG,118 outputs previously latched A-side data onto bus B; when SAB = LOW, it passes real-time A-side data - enabling flexible multiplexing and ping-pong buffering.
Is the 74LVT16646ADGG,118 pin-compatible with other 56-pin transceivers like the 74LVC16646?
No, the 74LVT16646ADGG,118 is not pin-compatible with 74LVC16646 variants. While both are 56-pin TSSOP transceivers, pin assignments differ significantly - e.g., 74LVT16646ADGG,118 places DIR and OE on pins 1/28/29/56, whereas 74LVC16646 uses different pin mapping for control signals. Always verify pinout against the specific datasheet before PCB layout.
74LVT16646ADGG,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- 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
74LVT16646ADGG,118 FAQ
1.How can I place an order for 74LVT16646ADGG,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT16646ADGG,118 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 74LVT16646ADGG,118 reliable?
The price and inventory of 74LVT16646ADGG,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT16646ADGG,118 is usually 5 days.
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Once your 74LVT16646ADGG,118 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 74LVT16646ADGG,118?
For technical support, including 74LVT16646ADGG,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT16646ADGG,118 requirements.
6.How does Aetrix verify that 74LVT16646ADGG,118 is sourced from the original manufacturer or authorized distributors?
All 74LVT16646ADGG,118 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 74LVT16646ADGG,118 meets industry standards.
7.What is the process for return or replacement of 74LVT16646ADGG,118?
All 74LVT16646ADGG,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT16646ADGG,118, 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 74LVT16646ADGG,118 part is unused and in its original packaging.
Return procedure for 74LVT16646ADGG,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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