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onsemi 74ABT16646CSSC
- Part No.:
- 74ABT16646CSSC
- Manufacturer:
- onsemi
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ABT16646CSSC.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,558
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Product details
Overview
74ABT16646CSSC 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 on all I/O pins for high-noise industrial backplane interfacing.
For engineers reviewing the 74ABT16646CSSC datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional register-controlled data flow, glitch-free hot-insertion capability, guaranteed latchup protection, and SSOP-56 package compatibility with JEDEC MO-118 footprint.
Technical Context
The 74ABT16646CSSC integrates two independent 16-bit D-type flip-flop registers (A and B), dual clock inputs (CPABn/CPBAn), dual select inputs (SABn/SBAn), and direction-controlled 3-STATE transceivers. Its logic enables concurrent storage and transparent transfer - e.g., clocking A-bus data into the A register while simultaneously routing B-bus data to A outputs in real time.
Control is managed via active-low OE, DIR, and select signals: OE disables all outputs to high-impedance; DIR determines data flow direction (A→B or B→A); SABn/SBAn select between stored register data and live bus data. All timing parameters are specified for CL = 50 pF and VCC = 4.5–5.5 V across −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 and mixed-voltage system rails |
| Max Clock Frequency | 200 MHz - supports high-speed synchronous bus arbitration in telecom and computing backplanes |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads (e.g., >100 pF traces) without external buffers |
| Propagation Delay | 1.5–4.9 ns (CL = 50 pF) - enables sub-5 ns timing margins for 200 MHz operation |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and base station equipment |
| I/O Capacitance | 11 pF - minimizes signal integrity degradation in high-density PCB layouts |
| Pin-to-Pin Skew | 2.0 ns (max, LH/HL transitions) - maintains deterministic timing alignment across all 32 I/Os |
Pinout & Package
74ABT16646CSSC uses a 56-lead Shrink Small Outline Package (SSOP), JEDEC MO-118 compliant, 0.300″ wide, with 0.025″ pitch. Package number MS56A.
| 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, enabled by OE/DIR |
| B0–B15 | Data Register B Inputs / 3-STATE Outputs | Bidirectional I/O port for B-side bus; latched on CPBAn rising edge, enabled by OE/DIR |
| CPABn, CPBAn | Asynchronous Clock Pulse Inputs | Edge-triggered clocks: CPABn captures A-bus data into A register; CPBAn captures B-bus data into B register |
| SABn, SBAn | Multiplexer Select Inputs | Select real-time (transparent) vs. registered data path for A→B or B→A transfers |
| OEn | Active-Low Output Enable | When HIGH, forces all A/B outputs to high-impedance - enables bus sharing without contention |
| DIR | Direction Control Input | LOW = B→A data flow; HIGH = A→B data flow - defines primary transceiver direction under OE LOW |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B Registers | Enables simultaneous capture of data from both buses - critical for handshake-free dual-port buffering |
| Multiplexed Real-Time & Stored Data | Allows mixing of live bus signals and previously latched values on same output - supports protocol-aware data stitching |
| Nondestructive Hot Insertion | Prevents bus glitches during live board insertion - eliminates need for power sequencing circuitry |
| Glitch-Free Power-Up/Down | Outputs remain high-impedance until VCC stabilizes - avoids spurious bus contention at power transition |
| Latchup Protection | Guaranteed immunity to CMOS latchup per JEDEC JESD78 - ensures reliability in noisy industrial environments |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: High-speed data routing between line cards and switching fabric in modular telecom chassis. IC Role / Device Role / Timing Role: Bidirectional transceiver with register staging to decouple asynchronous card clocks and synchronize burst transfers. Use Value: 200 MHz clock support and 64 mA drive enable direct connection to 100 Ω differential backplane traces without repeaters. | Use Scenario: Isolating and buffering field I/O modules from central controller CPU bus in programmable logic controllers. IC Role / Device Role / Timing Role: Registered transceiver providing noise-immune data latching and hot-swap-safe bus isolation. Use Value: Nondestructive hot insertion allows module replacement without shutting down entire PLC rack. |
| Test Equipment Bus Arbitration | Legacy System Protocol Bridge |
Use Scenario: Managing shared GPIB or VXIbus resources among multiple instrument controllers in automated test systems. IC Role / Device Role / Timing Role: Direction-controlled 3-STATE transceiver enabling dynamic bus master handoff with zero contention windows. Use Value: Sub-5 ns propagation delay and 2.0 ns pin skew ensure deterministic arbitration timing across 32-bit control/data lines. | Use Scenario: Bridging ISA or VME bus peripherals to modern microcontroller-based subsystems with mismatched timing. IC Role / Device Role / Timing Role: Dual-register interface storing legacy device status while presenting updated data to host processor. Use Value: Independent A/B registers allow simultaneous sampling of slow peripheral response and fast host read cycles. |
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), 6.1 mm width vs. 7.5 mm SSOP; identical AC/DC specs | Higher density layout; slightly lower thermal resistance but reduced mechanical robustness | Choose for space-constrained PCBs where JEDEC MO-153 footprint is acceptable |
| 74FCT16646CTPAG | FCT-family: 3.3 V tolerant inputs, 5 V supply; lower ICCZ (0.5 mA vs. 1.0 mA); 150 MHz max fMAX | Lower power, reduced EMI, but incompatible with strict 5 V TTL input thresholds | Choose when interfacing with mixed 3.3 V/5 V systems and 150 MHz suffices |
Compared with SN74ABT16646DGGR and 74FCT16646CTPAG, the 74ABT16646CSSC offers the widest SSOP body for manual assembly and thermal margin, full 5 V TTL compatibility, and highest clock rate - making it optimal for legacy 5 V backplane designs requiring mechanical durability and timing headroom.
Availability
74ABT16646CSSC is available at Aetrix Electronics and suitable for telecom backplane interfaces, industrial PLC I/O expansion, test equipment bus arbitration, and legacy system protocol bridges requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74ABT16646CSSC 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 semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016. Known for robust industrial-grade logic and power products.
The 74ABT16646CSSC belongs to Fairchild's ABT-series advanced biCMOS logic family, designed specifically for high-speed, high-drive 5 V bus interface applications in telecom infrastructure and industrial control systems.
FAQ
What is the maximum clock frequency supported by the 74ABT16646CSSC?
The 74ABT16646CSSC supports a maximum clock frequency of 200 MHz under standard operating conditions (VCC = 5.0 V, CL = 50 pF, TA = +25°C). Across the full industrial temperature range (−40°C to +85°C) and supply range (4.5–5.5 V), the guaranteed minimum fMAX remains 200 MHz per AC Electrical Characteristics table in the official Fairchild datasheet DS011644.
Does the 74ABT16646CSSC support hot insertion without damage?
Yes, the 74ABT16646CSSC features nondestructive hot insertion capability, verified per Fairchild's design and testing. This means the 74ABT16646CSSC can be safely inserted into a live 5 V bus without causing latchup, output contention, or permanent damage - a key requirement for modular telecom and industrial rack systems.
What is the output drive strength of the 74ABT16646CSSC on A0–A15 and B0–B15 pins?
The 74ABT16646CSSC provides 64 mA sink current and 32 mA source current on all A0–A15 and B0–B15 I/O pins. This drive strength is specified at VCC = 4.5–5.5 V and ensures reliable signaling into heavy capacitive loads typical of backplane and long-trace industrial bus applications.
How does the direction control (DIR) pin affect data flow in the 74ABT16646CSSC?
In the 74ABT16646CSSC, the DIR pin sets the primary transceiver direction when OE is LOW: DIR = HIGH enables A→B real-time transfer or A-register-to-B transfer; DIR = LOW enables B→A real-time transfer or B-register-to-A transfer. DIR has no effect when OE is HIGH (all outputs high-Z).
Is the 74ABT16646CSSC pin-compatible with other packages in the same family?
The 74ABT16646CSSC (SSOP-56, MS56A) shares identical pinout and logic function with the TSSOP-56 variant 74ABT16646CMTD (MTD56), but differs mechanically: MS56A is 0.300″ wide (7.62 mm), MTD56 is 6.1 mm wide. Both are electrically and functionally interchangeable when board layout accommodates the package width difference.
74ABT16646CSSC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm 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-SSOP
74ABT16646CSSC FAQ
1.How can I place an order for 74ABT16646CSSC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT16646CSSC 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 74ABT16646CSSC reliable?
The price and inventory of 74ABT16646CSSC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT16646CSSC is usually 5 days.
3.What payment methods are accepted for 74ABT16646CSSC?
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4.How is shipping managed for 74ABT16646CSSC?
74ABT16646CSSC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT16646CSSC 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 74ABT16646CSSC?
For technical support, including 74ABT16646CSSC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT16646CSSC requirements.
6.How does Aetrix verify that 74ABT16646CSSC is sourced from the original manufacturer or authorized distributors?
All 74ABT16646CSSC 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 74ABT16646CSSC meets industry standards.
7.What is the process for return or replacement of 74ABT16646CSSC?
All 74ABT16646CSSC units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT16646CSSC, 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 74ABT16646CSSC part is unused and in its original packaging.
Return procedure for 74ABT16646CSSC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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