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onsemi 74ABT16646CSSCX
- Part No.:
- 74ABT16646CSSCX
- Manufacturer:
- onsemi
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ABT16646CSSCX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,784
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Product details
Overview
74ABT16646CSSCX from Fairchild Semiconductor is a 16-bit bus transceiver with dual D-type registers, 3-STATE outputs, independent A/B bus control, 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 on all I/O pins. It is used in high-speed backplane and memory interface applications requiring bidirectional data flow with register hold capability.
For engineers reviewing the 74ABT16646CSSCX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed latchup protection, nondestructive hot insertion support, glitch-free high-impedance behavior during power-up/down, and SSOP-56 package compatibility with JEDEC MO-118 footprint.
Technical Context
The 74ABT16646CSSCX implements two independent 16-bit register banks (A and B), each with dedicated clock inputs (CPABn/CPBAn) and select controls (SABn/SBAn). Its transceiver logic enables simultaneous real-time (transparent) and stored-data transfer paths under direction (DIR) and output enable (OEn) control.
It supports four functional modes: isolation (OEn HIGH), real-time A→B or B→A transfer (OEn LOW + DIR HIGH/LOW), and register-to-bus transfer (OEn LOW + SABn/SBAn HIGH). All I/O pins are 5V-tolerant with ±30 mA input current rating and feature bus drainage test compliance (IZZ ≤ 100 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - Ensures compatibility with standard 5V TTL/CMOS systems and robust noise margin. |
| Max Clock Frequency | 200 MHz - Enables high-throughput data transfer in fast bus architectures like VME or custom backplanes. |
| Output Drive | 64 mA sink / 32 mA source - Supports direct driving of multiple TTL loads or termination-resistor networks without buffers. |
| Propagation Delay | 1.5–4.9 ns (CL = 50 pF) - Guarantees sub-5 ns timing for critical setup/hold windows in synchronous designs. |
| Input Voltage Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic levels for seamless interfacing with legacy 5V systems. |
| Bus Leakage (3-STATE) | ±10 µA (IOZL/IOZH) - Minimizes standby current and prevents unintended bus contention during disable. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded and communications equipment environments. |
Pinout & Package
74ABT16646CSSCX is housed in a 56-lead Shrink Small Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch. The package provides thermal and mechanical reliability for surface-mount reflow assembly and supports automated optical inspection.
| 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 when enabled. |
| B0–B15 | Data Register B Inputs / 3-STATE Outputs | Bidirectional I/O port for B-side bus; latched on CPBAn rising edge when enabled. |
| CPABn, CPBAn | Register Clock Inputs | Asynchronous positive-edge clocks controlling data capture into A and B registers respectively. |
| SABn, SBAn | Select Inputs | Enable multiplexing of stored A/B register data onto opposite bus during transceiver mode. |
| OEn | Output Enable Input (Active LOW) | Global 3-STATE control: HIGH disables all outputs; LOW enables transceiver or register output path. |
| DIR | Direction Control Input | Determines real-time flow direction: HIGH = A→B, LOW = B→A; active only when OEn is LOW. |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B Registers | Enables concurrent storage and routing of data from two separate buses without cross-talk or timing conflict. |
| Multiplexed Real-Time & Stored Data | Allows dynamic selection between live bus signals and previously latched values via SABn/SBAn, supporting flexible protocol arbitration. |
| 64 mA Sink / 32 mA Source Drive | Eliminates need for external bus drivers in high-fanout 5V systems, reducing component count and board area. |
| Glitch-Free High-Impedance During Power Sequencing | Prevents bus contention during power-up/down transitions-critical for hot-swap and modular system designs. |
| Nondestructive Hot Insertion Capability | Permits safe insertion/removal while powered, verified per JEDEC JESD78 latchup immunity requirements. |
Applications
| Backplane Data Routing | Memory Interface Buffering |
|---|---|
Use Scenario: Bidirectional data exchange between CPU and peripheral modules across a shared 16-bit parallel backplane. IC Role / Device Role / Timing Role: Transceiver and register hub managing time-multiplexed access to shared address/data lines with cycle-stable storage. Use Value: Enables deterministic latency via register hold and eliminates bus turnaround delays using DIR-controlled real-time flow. | Use Scenario: Interfacing a microcontroller with external SRAM or Flash memory requiring synchronized read/write handshaking. IC Role / Device Role / Timing Role: Level-shifting and timing-aligned buffer that captures memory address/data on clock edges and presents stable outputs to memory devices. Use Value: Provides 200 MHz timing margin and 64 mA drive to meet memory device setup/hold and load requirements. |
| Industrial PLC I/O Expansion | Legacy Bus Protocol Translation |
Use Scenario: Extending digital I/O capacity in programmable logic controllers where fieldbus modules require isolated, registered data staging. IC Role / Device Role / Timing Role: Registered transceiver isolating controller bus from noisy field-side I/O while preserving signal integrity across long traces. Use Value: Latchup protection and −40°C to +85°C operation ensure reliability in electrically harsh factory environments. | Use Scenario: Bridging ISA or VME bus segments with differing timing protocols or voltage domains in test instrumentation racks. IC Role / Device Role / Timing Role: Protocol-aware data multiplexer enabling selective pass-through or register-hold based on control signal state. Use Value: SABn/SBAn select logic allows runtime switching between legacy real-time transfers and buffered packetized data bursts. |
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 (MTD56), same electrical specs, 6.1 mm width vs. 7.5 mm SSOP. | Requires PCB layout change due to different footprint and thermal pad; identical logic function and timing. | Choose for space-constrained boards where TSSOP density is preferred over SSOP mechanical robustness. |
| 74FCT16646CTPAG | Lower ICCZ (0.5 mA vs. 1.0 mA), slightly slower max fMAX (160 MHz), FCT-family CMOS process. | Reduced power consumption but lower speed margin; not rated for nondestructive hot insertion. | Choose when static power budget is critical and 160 MHz suffices; avoid in hot-swap or high-reliability industrial use. |
Compared with SN74ABT16646DGGR and 74FCT16646CTPAG, the 74ABT16646CSSCX offers optimal balance of speed (200 MHz), drive strength (64 mA), and ruggedness (hot insertion, latchup protection) in the industry-standard SSOP-56 package.
Availability
74ABT16646CSSCX is available at Aetrix Electronics and suitable for backplane routing, memory interface buffering, and industrial PLC I/O expansion requiring stable component supply across extended product lifecycles.
Supply support for 74ABT16646CSSCX 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 mixed-signal ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and communications infrastructure.
The 74ABT16646CSSCX belongs to Fairchild's Advanced BiCMOS Technology (ABT) logic series, engineered for high-speed, low-noise 5V bus interfacing with enhanced drive capability and system-level robustness.
FAQ
What is the maximum operating frequency of the 74ABT16646CSSCX?
The 74ABT16646CSSCX supports a maximum clock frequency of 200 MHz under standard AC conditions (VCC = 5.0 V, CL = 50 pF, TA = +25°C). At full industrial temperature range (−40°C to +85°C) and VCC = 4.5–5.5 V, the guaranteed minimum fMAX remains 200 MHz per datasheet AC Electrical Characteristics table. This makes the 74ABT16646CSSCX suitable for demanding high-speed bus applications such as VME64x and custom parallel interconnects.
Does the 74ABT16646CSSCX support hot insertion?
Yes, the 74ABT16646CSSCX features nondestructive hot insertion capability, verified per JEDEC JESD78 latchup immunity standards. Its input structure includes built-in clamp diodes and current limiting, and its 3-STATE outputs remain high-impedance during power sequencing. This ensures safe insertion into live backplanes or modular chassis without damaging the device or disturbing system operation-critical for telecom and industrial rack systems.
What are the voltage thresholds for logic HIGH and LOW inputs on the 74ABT16646CSSCX?
The 74ABT16646CSSCX specifies VIH = 2.0 V (minimum recognized HIGH) and VIL = 0.8 V (maximum recognized LOW) across the full operating temperature and supply range. These thresholds align with standard TTL logic families, ensuring interoperability with legacy 5V microcontrollers, FPGAs, and peripheral ICs without level-shifting circuitry. Input leakage remains below ±1 µA at these thresholds, minimizing loading effects on driving sources.
How does the 74ABT16646CSSCX handle bus contention during power-up?
The 74ABT16646CSSCX guarantees glitch-free high-impedance behavior across the entire power-up and power-down cycle. Its output drivers remain in a high-Z state until VCC reaches valid operating range and internal biasing stabilizes-preventing transient bus contention or false data assertion. This behavior is explicitly tested and documented in the datasheet's "High impedance glitch free bus loading" feature, making it ideal for systems with asymmetric power sequencing.
What package type is used for the 74ABT16646CSSCX?
The 74ABT16646CSSCX uses a 56-lead Shrink Small Outline Package (SSOP) with JEDEC MO-118 compliance, designated package number MS56A. It measures 0.300" wide with 0.025" lead pitch and is optimized for surface-mount reflow assembly. This SSOP variant provides better thermal dissipation and mechanical stability than TSSOP alternatives, especially under sustained 64 mA output loading conditions.
74ABT16646CSSCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
74ABT16646CSSCX FAQ
1.How can I place an order for 74ABT16646CSSCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT16646CSSCX 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 74ABT16646CSSCX reliable?
The price and inventory of 74ABT16646CSSCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT16646CSSCX is usually 5 days.
3.What payment methods are accepted for 74ABT16646CSSCX?
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4.How is shipping managed for 74ABT16646CSSCX?
74ABT16646CSSCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT16646CSSCX 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 74ABT16646CSSCX?
For technical support, including 74ABT16646CSSCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT16646CSSCX requirements.
6.How does Aetrix verify that 74ABT16646CSSCX is sourced from the original manufacturer or authorized distributors?
All 74ABT16646CSSCX 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 74ABT16646CSSCX meets industry standards.
7.What is the process for return or replacement of 74ABT16646CSSCX?
All 74ABT16646CSSCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT16646CSSCX, 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 74ABT16646CSSCX part is unused and in its original packaging.
Return procedure for 74ABT16646CSSCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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