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Texas Instruments SN74ABT16646DLR
- Part No.:
- SN74ABT16646DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16646DLR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
SN74ABT16646DLR from Texas Instruments is a 16-bit bus transceiver and register IC with 3-state outputs, designed for high-speed bidirectional data routing in 5-V systems. It integrates dual 8-bit registers, direction control (DIR), output enable (OE), and select-control (SAB/SBA) logic to support real-time or stored-data transfer between A and B buses. Key confirmed specs include 125 MHz max clock frequency, –32 mA/64 mA high-drive outputs, and operation from –40°C to 85°C.
For engineers reviewing the SN74ABT16646DLR datasheet, SN74ABT16646DLR pinout, SN74ABT16646DLR application, or SN74ABT16646DLR equivalent, this page delivers verified functional architecture, timing-critical switching parameters, DL-package pin mapping, and validated alternatives for bus isolation, multiplexed register buffering, and hot-swap-capable backplane interface design.
Technical Context
The SN74ABT16646DLR implements a flow-through architecture with distributed VCC/GND pins to minimize high-speed switching noise. Its dual-clock system (CLKAB/CLKBA) enables independent latching of A- or B-bus data on low-to-high transitions, while SAB/SBA inputs allow glitch-free multiplexing between transparent and registered data paths without external decoding.
It operates exclusively at 4.5–5.5 V, supports TTL-level inputs, and features high-drive outputs (–32 mA IOH, 64 mA IOL) with guaranteed VOL ≤ 0.55 V at 64 mA. Latch-up immunity exceeds 500 mA per JESD 17, and output ground bounce (VOLP) remains < 1 V at VCC = 5 V, TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 16-bit bidirectional bus transceiver with dual 8-bit D-type registers and 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with legacy 5-V TTL and CMOS logic domains |
| Max Clock Frequency | 125 MHz - enables high-throughput data capture in memory interfaces and backplane controllers |
| Output Drive | –32 mA IOH, 64 mA IOL - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 4.9 ns (A↔B), ≤ 5.3 ns (SAB/SBA→output) - supports sub-8 ns cycle times in synchronous bus designs |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded control and communications equipment |
| Package | 56-pin SSOP (DL) - 0.5 mm pitch, 13.9 × 7.9 mm footprint, RoHS-compliant NIPDAU finish |
Pinout & Package
SN74ABT16646DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 0.5 mm pitch, 13.9 mm × 7.9 mm body size, and 1.2 mm max height. Pin 1 identifier is located at top-left corner (Q1 quadrant in tape).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Controls data flow direction: DIR = L routes B→A; DIR = H routes A→B (when OE = L) |
| 1OE, 2OE | Output enable input | Active-low: OE = L enables transceiver; OE = H forces all outputs to high-impedance state |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register clock input | Low-to-high edge clocks data from A bus (CLKAB) or B bus (CLKBA) into respective 8-bit registers |
| 1SAB, 2SAB, 1SBA, 2SBA | Select control input | Chooses between real-time (S = L) or stored (S = H) data for output multiplexing - eliminates decode glitches |
| A1–A8, B1–B8 (×2 groups) | Bus I/O terminals | Two independent 8-bit bidirectional data ports; each port supports simultaneous input capture and output driving |
| VCC, GND (×8 total) | Power distribution | Distributed VCC/GND pins reduce simultaneous switching noise and improve signal integrity at >100 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Optimizes PCB layout by aligning input and output pins on opposite sides - reduces trace crossovers and layer count |
| Glitch-free select control | SAB/SBA circuitry prevents transient invalid states during transitions between real-time and registered data modes |
| High-drive 3-state outputs | –32 mA/64 mA drive strength maintains signal integrity across long traces or unterminated stubs in backplane applications |
| Distributed power/ground | Eight VCC and eight GND pins minimize ground bounce and supply droop during full-bus switching events |
| Isolation mode support | When OE = H, A and B data can be independently latched and held - enables safe bus arbitration and hot-swap sequencing |
Applications
| Memory Interface Buffering | Backplane Data Multiplexing |
|---|---|
|
Use Scenario: Isolating and synchronizing data between a microprocessor's address/data bus and multiple SRAM banks with differing access timing. IC Role / Device Role / Timing Role: Acts as a registered bus transceiver that captures and holds address/data on CLKAB/CLKBA edges, then forwards stable signals to memory devices under DIR/OE control. Use Value: Eliminates timing skew between parallel memory channels and enables clean setup/hold margins using internal register storage. |
Use Scenario: Routing time-multiplexed data streams across a shared 16-bit backplane between CPU, FPGA, and peripheral modules. IC Role / Device Role / Timing Role: Functions as a programmable bus switch with register hold capability, allowing real-time or buffered transfers based on SAB/SBA configuration. Use Value: Enables deterministic latency via registered path selection and avoids metastability during dynamic bus reconfiguration. |
| Industrial PLC I/O Expansion | Hot-Swappable Module Interface |
|
Use Scenario: Extending digital I/O capacity in programmable logic controllers where fieldbus modules require synchronized data handshaking. IC Role / Device Role / Timing Role: Provides bidirectional data latching between controller bus and module interface, with DIR and OE enabling controlled read/write cycles. Use Value: Guarantees data coherency during cyclic scan execution by decoupling module response time from main bus timing. |
Use Scenario: Enabling safe insertion/removal of line cards in telecom or test equipment chassis without disrupting active bus traffic. IC Role / Device Role / Timing Role: Enters high-impedance isolation mode (OE = H) during card removal while retaining last-latched A/B data for fast resynchronization. Use Value: Prevents bus contention and signal corruption during hot-swap events - critical for carrier-grade system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT162245DLR | Non-registering 16-bit transceiver; no CLK/SAB/SBA logic; only DIR/OE control | Lacks data storage - suitable for simple level-shifting or bus extension, not for synchronized capture | Choose when real-time pass-through suffices and register functionality is unnecessary |
| SN74LVTH16646DLR | Lower-voltage variant (2.7–3.6 V); reduced drive (–24 mA/48 mA); 100 MHz max clock | Designed for mixed-voltage 3.3-V systems; incompatible with 5-V TTL signaling without level translation | Prefer for power-sensitive 3.3-V designs where SN74ABT16646DLR's 5-V operation is excessive |
Compared with SN74ABT16646DLR, SN74ABT162245DLR omits register and select-control logic-reducing complexity but eliminating buffered data hold. SN74LVTH16646DLR trades voltage compatibility and speed for lower power, making it unsuitable as a drop-in replacement in 5-V industrial backplanes.
Availability
SN74ABT16646DLR is available at Aetrix Electronics and suitable for industrial PLCs, telecom backplanes, memory subsystems, and hot-swappable module interfaces requiring stable component supply, long-term lifecycle assurance, and consistent SSOP-DL packaging.
Supply support for SN74ABT16646DLR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability interface ICs.
The SN74ABT16646DLR belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, noise-immune data routing in industrial and communications infrastructure applications.
FAQ
What is the maximum clock frequency supported by the SN74ABT16646DLR?
The SN74ABT16646DLR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification is confirmed in the timing requirements table of the official datasheet SCBS212D, and applies to both CLKAB and CLKBA inputs for reliable register capture across the full industrial temperature range.
Does the SN74ABT16646DLR support 3.3-V logic levels?
No, the SN74ABT16646DLR is specified only for 4.5–5.5 V operation and requires TTL-compatible input thresholds (VIL ≤ 0.8 V, VVIH ≥ 2.0 V). It does not support direct 3.3-V logic interfacing; use SN74LVTH16646DLR for 3.3-V systems or add level-shifting circuitry when interfacing with lower-voltage devices.
How does the SN74ABT16646DLR prevent output glitches during data multiplexing?
The SN74ABT16646DLR eliminates multiplexer glitches through dedicated SAB/SBA control logic that synchronously switches between real-time and registered data paths without intermediate invalid states. This hardware-based approach - documented in the functional description and Figure 1 - avoids the timing hazards common in externally decoded multiplexers.
What package type is used for the SN74ABT16646DLR?
The SN74ABT16646DLR uses a 56-pin Shrink Small-Outline Package (SSOP) with designation DL, measuring 13.9 mm × 7.9 mm with 0.5 mm lead pitch. This package is distinct from the TSSOP (DGG) variant and is supplied in 1000-unit tape-and-reel format (LR suffix), as confirmed in TI's Packaging Information Addendum.
Can the SN74ABT16646DLR operate with OE tied directly to ground?
Yes - tying OE low enables the transceiver function, but TI recommends pulling OE to VCC via a resistor during power-up/down to guarantee high-impedance state and prevent bus contention. Direct grounding is acceptable in steady-state operation, provided system reset sequencing ensures controlled enable timing relative to clock and data stability.
SN74ABT16646DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN74ABT16646DLR FAQ
1.How can I place an order for SN74ABT16646DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16646DLR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABT16646DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16646DLR is usually 5 days.
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5.How can I obtain technical support or documentation for SN74ABT16646DLR?
For technical support, including SN74ABT16646DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16646DLR requirements.
6.How does Aetrix verify that SN74ABT16646DLR is sourced from the original manufacturer or authorized distributors?
All SN74ABT16646DLR 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 SN74ABT16646DLR meets industry standards.
7.What is the process for return or replacement of SN74ABT16646DLR?
All SN74ABT16646DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16646DLR, 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 SN74ABT16646DLR part is unused and in its original packaging.
Return procedure for SN74ABT16646DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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