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Texas Instruments SN74ABT16646DL
- Part No.:
- SN74ABT16646DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16646DL.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
SN74ABT16646DL from Texas Instruments is a 16-bit bus transceiver and register IC with 3-state outputs, designed for high-speed bidirectional data flow between two 16-bit buses (A and B). It supports real-time or registered data transfer, features ±32-mA/64-mA drive strength, operates from –40°C to 85°C at 4.5–5.5 V, and is used in backplane interface, memory expansion, and system-level bus isolation applications.
For engineers reviewing the SN74ABT16646DL datasheet, SN74ABT16646DL pinout, SN74ABT16646DL application, or SN74ABT16646DL equivalent, key selection considerations include its dual 8-bit or single 16-bit configurable transceiver mode, clocked register storage (CLKAB/CLKBA), direction control (DIR), output enable (OE), and select-control (SAB/SBA) for glitch-free multiplexing between transparent and stored data paths.
Technical Context
The SN74ABT16646DL implements a flow-through architecture with distributed VCC/GND pins to minimize switching noise and supports latch-up immunity exceeding 500 mA per JESD 17. Its EPIC-IIB BiCMOS process enables low ground bounce (VOLP < 1 V at 5 V) and high-drive capability (–32 mA IOH, 64 mA IOL).
It integrates two independent 8-bit register-transceiver blocks-each with dedicated CLKAB/CLKBA, DIR, OE, SAB/SBA, and A/B port terminals-allowing simultaneous or selective storage and transfer of data from either bus, with no internal bus contention due to strict one-bus-driven-at-a-time operation.
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 standard 5-V TTL and LVTTL systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
| Output Drive | –32 mA IOH, +64 mA IOL - drives heavy capacitive loads and long traces without external buffers |
| Max Clock Frequency | 125 MHz - supports high-throughput synchronous bus arbitration and data capture |
| Propagation Delay | tPLH/tPHL ≤ 4.9 ns (A↔B) - enables sub-8-ns round-trip latency in register-bypass mode |
| Input Hysteresis | 100 mV - improves noise immunity on control inputs (DIR, OE, SAB, SBA) |
Pinout & Package
SN74ABT16646DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 13.9 mm × 7.9 mm body, 0.5-mm pitch, 1.2-mm max height, with pin 1 marked in quadrant Q1 per JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Determines data flow direction: low = B→A, high = A→B when OE is active |
| 1OE, 2OE | Output enable input (per 8-bit section) | Active-low; places corresponding A/B outputs in high-impedance state when high |
| 1CLKAB, 2CLKAB 1CLKBA, 2CLKBA | Clock inputs for register capture | Low-to-high transition clocks data from A bus (CLKAB) or B bus (CLKBA) into internal registers |
| 1SAB, 2SAB 1SBA, 2SBA | Select control inputs | Choose between real-time (transparent) or stored data on output bus; eliminates multiplexer glitches |
| A1–A8, A9–A16 B1–B8, B9–B16 | Bi-directional data I/O ports | Each pair (e.g., 1A1/1B1) forms a single transceiver channel; inputs remain enabled even when outputs are disabled |
| VCC, GND | Power and ground | Distributed across package (12 VCC, 12 GND pins) to reduce simultaneous switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Optimizes PCB layout by aligning inputs and outputs on opposite sides, reducing trace crossovers and layer count |
| Dual independent register-transceiver blocks | Enables concurrent management of two 8-bit subsystems (e.g., CPU ↔ local memory and I/O controller ↔ peripheral bus) |
| Glitch-free select control (SAB/SBA) | Eliminates decoding hazards during transitions between stored and real-time data paths-critical for deterministic timing in arbitration logic |
| High-drive 3-state outputs | Supports fan-out to ≥10 LSTTL loads or direct connection to unterminated 50-Ω transmission lines without signal integrity degradation |
| Distributed power/ground pinning | Reduces ∆I/∆t-induced supply rail collapse and ground bounce, enabling stable operation at 125-MHz clock rates |
Applications
| Backplane Data Routing | Memory Expansion Interface |
|---|---|
Use Scenario: Isolating and synchronizing data between multiple plug-in cards in a modular industrial controller chassis. IC Role / Device Role: Bidirectional bus transceiver with clocked register staging to absorb timing skew between asynchronous card domains. Use Value: Enables deterministic handshaking across hot-swappable slots using stored data mode while maintaining real-time pass-through for control signals. | Use Scenario: Extending 16-bit data bus between microprocessor and parallel SRAM/Flash modules in embedded instrumentation. IC Role / Device Role: Registered transceiver buffering address/data lines to meet setup/hold timing under varying load conditions. Use Value: Achieves reliable 125-MHz burst transfers with tsu = 3 ns and th = 0 ns at 5 V, eliminating need for external delay matching. |
| System-Level Bus Isolation | Dual-Processor Interconnect |
Use Scenario: Preventing electrical contention between two independent 16-bit processor buses sharing a common peripheral resource. IC Role / Device Role: Direction-controlled 3-state isolator with OE-gated output disable and DIR-synchronized data routing. Use Value: Guarantees high-impedance isolation during power-up/down via pull-up on OE, meeting TI's recommended safe-start requirement. | Use Scenario: Enabling peer-to-peer DMA transfers between two ARM-based SoCs operating at different voltage or timing domains. IC Role / Device Role: Dual-register transceiver acting as synchronized data pipeline with independent CLKAB/CLKBA clocks per domain. Use Value: Allows each processor to independently clock data into its local register and release it to the other bus on demand-no shared clock required. |
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 |
|---|---|---|---|
| SN74ABT162245DL | No internal registers; only 3-state transceiver function; identical 56-pin SSOP-DL package and 125-MHz max frequency | Suitable where real-time pass-through suffices but clocked storage is unnecessary | Select when register functionality adds complexity or cost without benefit in timing-critical point-to-point links |
| SN74LVTH16646DL | Lower-voltage operation (2.7–3.6 V); reduced drive (–24 mA/+24 mA); same pinout and logic function | Targets mixed-voltage 3.3-V systems interfacing to legacy 5-V peripherals | Choose for power-sensitive or voltage-tiered designs where 5-V tolerance and high drive are not required |
Compared with SN74ABT162245DL and SN74LVTH16646DL, the SN74ABT16646DL uniquely combines 5-V robustness, high-current drive, and dual-register capability in a single 56-pin SSOP-making it optimal for industrial backplanes requiring both timing margin and data staging.
Availability
SN74ABT16646DL is available at Aetrix Electronics and suitable for industrial backplane routing, memory expansion interfaces, system-level bus isolation, and dual-processor interconnect applications requiring stable component supply and long-term production continuity.
Supply support for SN74ABT16646DL 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 over 50 years of innovation in high-reliability interface ICs.
The SN74ABT16646DL belongs to TI's Widebus™ family of advanced bus-interface devices, engineered for high-speed, low-noise, and latch-up-resistant operation in industrial, computing, and communications infrastructure.
FAQ
What is the maximum clock frequency supported by the SN74ABT16646DL?
The SN74ABT16646DL supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C), as verified in the timing characteristics table of the SCBS212D datasheet. This applies to both CLKAB and CLKBA inputs and enables high-throughput synchronous data capture in register mode. Performance remains stable across the full industrial temperature range (–40°C to +85°C), with minor derating only at temperature extremes.
How does the SN74ABT16646DL handle power-up sequencing to avoid bus contention?
To ensure high-impedance outputs during power-up or power-down, the SN74ABT16646DL requires OE to be tied to VCC through a pull-up resistor-the minimum value determined by the driver's current-sinking capability. This design prevents unintended bus driving before system initialization completes. The device's internal circuitry maintains input functionality even when outputs are disabled, allowing safe registration of startup configuration data prior to bus activation.
Can the SN74ABT16646DL operate with only one 8-bit section enabled while the other is isolated?
Yes. The SN74ABT16646DL contains two electrically independent 8-bit sections (1A/1B and 2A/2B), each with dedicated DIR, OE, CLKAB, CLKBA, SAB, and SBA controls. Setting 1OE = high disables all 1A/1B outputs while preserving 2A/2B functionality-and vice versa. This allows partial bus utilization, such as dedicating one section to control/status lines and the other to high-speed data, without cross-talk or timing interaction.
What is the purpose of the SAB and SBA inputs on the SN74ABT16646DL?
The SAB and SBA inputs on the SN74ABT16646DL control multiplexing between real-time (transparent) and stored data paths for each 8-bit section. When SAB = low, real-time B-bus data passes to A-bus; when SAB = high, previously clocked B-bus data from the register is output. This glitch-free select logic eliminates transient spikes during mode transitions-critical for deterministic arbitration in time-sensitive bus protocols. Identical behavior applies to SBA for A→B flow.
Is the SN74ABT16646DL pin-compatible with other members of the 'ABT16646 family?
Yes-the SN74ABT16646DL shares identical pinout, function mapping, and package footprint with SN74ABT16646DGGR (TSSOP-56) and SN54ABT16646WD (ceramic flatpack), as confirmed in the "Package Options" section of SCBS212D. All variants use the same 56-pin arrangement, logic behavior, and timing specifications, differing only in package type, thermal resistance (θJA = 74°C/W for DL), and temperature rating (industrial vs. military).
SN74ABT16646DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74ABT16646DL FAQ
1.How can I place an order for SN74ABT16646DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16646DL 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 SN74ABT16646DL reliable?
The price and inventory of SN74ABT16646DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16646DL is usually 5 days.
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SN74ABT16646DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16646DL 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 SN74ABT16646DL?
For technical support, including SN74ABT16646DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16646DL requirements.
6.How does Aetrix verify that SN74ABT16646DL is sourced from the original manufacturer or authorized distributors?
All SN74ABT16646DL 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 SN74ABT16646DL meets industry standards.
7.What is the process for return or replacement of SN74ABT16646DL?
All SN74ABT16646DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16646DL, 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 SN74ABT16646DL part is unused and in its original packaging.
Return procedure for SN74ABT16646DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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