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onsemi 74ABT16646CMTD
- Part No.:
- 74ABT16646CMTD
- Manufacturer:
- onsemi
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74ABT16646CMTD.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,514
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Product details
Overview
74ABT16646CMTD from Fairchild Semiconductor is a 16-bit bus transceiver and dual-register IC with independent A/B data paths, 3-STATE outputs, and multiplexed real-time/stored data routing. It operates at 4.5–5.5 V, supports up to 200 MHz clock frequency, and delivers 64 mA sink / 32 mA source drive per I/O for high-noise industrial backplane interfacing.
For engineers reviewing the 74ABT16646CMTD datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional register-controlled data flow, nondestructive hot insertion capability, guaranteed latchup protection, and TSSOP-56 packaging compatible with high-density PCB layouts.
Technical Context
The 74ABT16646CMTD integrates two independent 16-bit D-type flip-flop registers (A and B), dual clock inputs (CPABn/CPBAn), dual select controls (SABn/SBAn), and direction-enabled transceiver logic. Its operation supports four distinct modes: real-time A→B or B→A transfer, register storage from either bus, and register-to-bus output - all under active-low OE control.
It implements glitch-free 3-STATE bus loading across full power-up/down cycles and meets JEDEC MO-153 mechanical standards for the 56-lead TSSOP package. AC timing is specified at CL = 50 pF, RL = 500 Ω, with propagation delays as low as 1.5 ns (min) and max disable time of 6.5 ns over −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - ensures compatibility with 5 V TTL/CMOS systems and robust noise margin |
| Max Clock Frequency | 200 MHz - enables high-speed synchronous data transfer in backplane and memory interface applications |
| Output Drive | 64 mA sink / 32 mA source - supports driving heavy capacitive loads and multiple TTL inputs without external buffers |
| Propagation Delay | 1.5–6.5 ns - guarantees sub-7 ns timing closure for critical control-path signals in real-time systems |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded and telecom infrastructure use |
| I/O Capacitance | 11 pF (CI/O) - minimizes signal distortion and crosstalk in high-speed parallel bus designs |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - provides clear TTL-compatible logic level recognition under varying VCC |
Pinout & Package
74ABT16646CMTD is housed in a 56-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch. The package supports fine-pitch surface-mount assembly and thermal performance suitable for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Data Register A Inputs / 3-STATE Outputs | Bidirectional I/O port for A-side bus; latched on CPABn rising edge or routed transparently when enabled |
| B0–B15 | Data Register B Inputs / 3-STATE Outputs | Bidirectional I/O port for B-side bus; latched on CPBAn rising edge or routed transparently when enabled |
| CPABn, CPBAn | Asynchronous Clock Pulse Inputs | Active-HIGH edge-triggered clocks controlling A→Register and B→Register capture respectively |
| SABn, SBAn | Select Inputs | Control multiplexing between real-time (transparent) and stored (registered) data paths |
| OEn | Output Enable Input | Active-LOW global enable for all 3-STATE outputs; HIGH places A/B ports in high-impedance isolation mode |
| DIR | Direction Control Input | Determines bus direction during transceiver mode: DIR = HIGH → A→B; DIR = LOW → B→A |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B Registers | Enables simultaneous storage and routing of two separate 16-bit data streams without cross-contamination |
| Multiplexed Real-Time + Stored Data | Allows dynamic switching between live bus traffic and pre-latched values via SABn/SBAn, supporting protocol arbitration |
| Nondestructive Hot Insertion | Permits safe board insertion/removal while system is powered, preventing bus contention or latchup events |
| Glitch-Free Power Cycling | Guarantees high-impedance state throughout power-up/down, eliminating transient bus conflicts in modular systems |
| Latchup Protection | Rated to withstand >500 mA reverse current and 10 V overvoltage on I/O pins per JEDEC JESD78 |
Applications
| Backplane Data Routing | Memory Interface Buffering |
|---|---|
|
Use Scenario: High-speed data exchange between CPU and peripheral modules across a shared 16-bit parallel backplane. IC Role / Device Role / Timing Role: Bidirectional transceiver with register staging to decouple master/slave timing skew and absorb burst transfers. Use Value: Enables deterministic latency via registered path selection and eliminates bus contention during hot-swap events. |
Use Scenario: Interfacing a microcontroller's address/data bus to asynchronous SRAM or Flash memory with mismatched timing windows. IC Role / Device Role / Timing Role: Registered buffer that captures and holds address/data during setup/hold violations, then forwards synchronously. Use Value: Extends memory access window by up to 6.5 ns and supports 200 MHz clock-aligned transfers. |
| Industrial PLC I/O Expansion | Legacy Bus Protocol Translation |
|
Use Scenario: Adding isolated 16-bit digital I/O channels to a programmable logic controller rack using modular carrier boards. IC Role / Device Role / Timing Role: Isolation-capable transceiver with independent A/B registers for input sampling and output latching. Use Value: Supports simultaneous read-modify-write operations on field I/O without bus lock, leveraging DIR and OE control. |
Use Scenario: Bridging legacy 5 V parallel buses (e.g., ISA, VME) to modern FPGA-based controllers requiring synchronized handshaking. IC Role / Device Role / Timing Role: Protocol-aware transceiver that stores handshake signals and data in separate registers for precise timing alignment. Use Value: Eliminates need for external glue logic by integrating clocked storage, direction control, and 3-STATE management in one device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT16646DGGR | TSSOP-56 package, identical pinout and AC/DC specs; TI version with same 200 MHz fMAX and 64 mA drive | Same functional behavior and timing; validated for TI-based reference designs and automotive-qualified supply chains | Drop-in replacement if sourcing from TI-authorized distributors; verify qualification status for extended temperature use |
| 74FCT16646ATPAG | Lower drive (24 mA sink), higher speed (250 MHz), different input thresholds (VIH = 2.0 V, VIL = 0.8 V same), same TSSOP-56 | Better suited for ultra-high-speed interconnects where lower power and faster edges are prioritized over drive strength | Prefer when system load capacitance ≤ 30 pF and VCC = 5.0 V ±5%; not recommended for heavy stubbed backplanes |
Compared with SN74ABT16646DGGR and 74FCT16646ATPAG, the 74ABT16646CMTD offers optimal balance of drive strength, industrial temperature range, and proven latchup immunity - making it preferred for ruggedized backplane and PLC applications where reliability outweighs marginal speed gains.
Availability
74ABT16646CMTD is available at Aetrix Electronics and suitable for industrial backplane routing, memory interface buffering, and PLC I/O expansion requiring stable component supply across extended lifecycle programs.
Supply support for 74ABT16646CMTD 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 leading designer of high-performance analog and logic ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and telecom infrastructure.
The 74ABT16646CMTD belongs to the ABT (Advanced BiCMOS Technology) logic series, engineered for high-speed, high-drive 5 V TTL-compatible applications demanding robustness in noisy, thermally variable environments.
FAQ
What is the maximum clock frequency supported by the 74ABT16646CMTD?
The 74ABT16646CMTD supports a maximum clock frequency of 200 MHz under standard operating conditions (VCC = 5.0 V, TA = +25°C, CL = 50 pF). This rating is maintained across the full industrial temperature range (−40°C to +85°C) with VCC = 4.5–5.5 V, enabling reliable high-speed data capture in real-time control systems.
Does the 74ABT16646CMTD support hot insertion without damaging the device or system bus?
Yes, the 74ABT16646CMTD features nondestructive hot insertion capability, verified per Fairchild's design and test methodology. Its 3-STATE outputs remain high-impedance during power transitions, and internal latchup protection withstands ±500 mA reverse current - ensuring safe insertion into live backplanes or modular chassis.
How does the 74ABT16646CMTD handle bus isolation when outputs are disabled?
When OEn is HIGH, the 74ABT16646CMTD enters isolation mode: all A0–A15 and B0–B15 outputs enter high-impedance state regardless of DIR or clock activity. Critically, this state is guaranteed glitch-free across full power-up/down cycles, preventing unintended bus contention or signal corruption during system initialization or reset sequences.
What are the voltage thresholds for logic HIGH and LOW inputs on the 74ABT16646CMTD?
The 74ABT16646CMTD specifies VIH = 2.0 V (minimum recognized HIGH) and VIL = 0.8 V (maximum recognized LOW) across its operating temperature and voltage range. These thresholds ensure robust TTL-level compatibility and noise immunity in electrically noisy industrial environments where signal integrity is critical.
Can the 74ABT16646CMTD operate with both real-time and registered data paths simultaneously?
Yes - the 74ABT16646CMTD supports concurrent real-time (transparent) and registered data routing via dedicated select inputs SABn and SBAn. For example, A→B real-time transfer can occur while B→A registered data is held and prepared for output, enabling protocol arbitration and pipelined bus operations without external logic.
74ABT16646CMTD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
74ABT16646CMTD FAQ
1.How can I place an order for 74ABT16646CMTD through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT16646CMTD 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 74ABT16646CMTD reliable?
The price and inventory of 74ABT16646CMTD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT16646CMTD is usually 5 days.
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4.How is shipping managed for 74ABT16646CMTD?
74ABT16646CMTD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT16646CMTD 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 74ABT16646CMTD?
For technical support, including 74ABT16646CMTD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT16646CMTD requirements.
6.How does Aetrix verify that 74ABT16646CMTD is sourced from the original manufacturer or authorized distributors?
All 74ABT16646CMTD 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 74ABT16646CMTD meets industry standards.
7.What is the process for return or replacement of 74ABT16646CMTD?
All 74ABT16646CMTD units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT16646CMTD, 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 74ABT16646CMTD part is unused and in its original packaging.
Return procedure for 74ABT16646CMTD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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