My Inquiry
My Account
Texas Instruments SN74ABT16646DGGR
- Part No.:
- SN74ABT16646DGGR
- Manufacturer:
- Texas Instruments
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74ABT16646DGGR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT16646DGGR from Texas Instruments is a 16-bit bus transceiver and register IC with 3-state outputs, designed for high-speed bidirectional data routing in industrial and computing systems. It supports dual 8-bit or single 16-bit operation, features ±32-mA high-drive outputs, operates at up to 125 MHz clock frequency, and is rated for –40°C to 85°C ambient temperature - enabling use in real-time bus arbitration and buffered memory interface applications.
For engineers reviewing the SN74ABT16646DGGR datasheet, SN74ABT16646DGGR pinout, SN74ABT16646DGGR application, or SN74ABT16646DGGR equivalent, this page delivers verified functional architecture, timing-critical switching parameters, TSSOP-56 package layout guidance, and validated alternative options for bus isolation and registered data transfer designs.
Technical Context
The SN74ABT16646DGGR integrates two independent 8-bit transceiver/register blocks, each with dedicated CLKAB/CLKBA clocks, DIR direction control, OE output enable, and SAB/SBA select inputs. Its flow-through architecture enables transparent or registered data paths without internal bus contention.
It implements EPIC-IIB BiCMOS logic for low ground bounce (VOLP < 1 V), distributed VCC/GND pins to suppress switching noise, and latch-up immunity exceeding 500 mA per JESD 17 - making it suitable for mixed-signal PCBs where signal integrity and I/O robustness are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and LVTTL logic families and stable operation across industrial voltage tolerances. |
| Max Clock Frequency | 125 MHz - supports high-throughput synchronous bus transfers in backplane and memory subsystem interfaces. |
| Output Drive Strength | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads and long traces without external buffers in dense PCB layouts. |
| Propagation Delay | tPLH/tPHL ≤ 4.9 ns (A↔B) - guarantees sub-5-ns data path latency for time-critical interconnects. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including factory automation and telecom infrastructure. |
| Package Type | TSSOP-56 (DGG) - 13.9 mm × 6.1 mm footprint with 0.5-mm pitch, optimized for automated assembly and thermal dissipation (θJA = 81°C/W). |
| Input Hysteresis | 100 mV - rejects noise on control lines (DIR, OE, SAB/SBA) in electrically noisy industrial settings. |
Pinout & Package
TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm body, 0.5-mm lead pitch, 1.2-mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction Control Input | Determines data flow direction (A→B or B→A) per 8-bit section when OE is active low. |
| 1OE, 2OE | Output Enable Input | Active-low global enable; forces all outputs into high-impedance state when high - essential for bus sharing and power-up safety. |
| 1CLKAB, 2CLKAB 1CLKBA, 2CLKBA | Register Clock Input | Low-to-high edge captures data from A or B bus into internal D-type flip-flops - enables synchronous latching without external clock distribution. |
| 1SAB, 2SAB 1SBA, 2SBA | Select Control Input | Chooses between real-time (transparent) or stored (registered) data on output - eliminates multiplexer glitches during mode transitions. |
| A1–A8, B1–B8 (×2) | Bi-directional Data Bus Terminal | 16 total I/O pins split across two 8-bit buses; support hot-swappable bus loading and bidirectional signal routing. |
| VCC, GND (×8) | Power Distribution Network | Distributed VCC/GND pins minimize simultaneous switching noise and improve PSRR in high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Eliminates internal bus contention and simplifies PCB trace routing by aligning input and output pins on opposite sides of the package. |
| High-drive 3-state outputs | –32 mA IOH / 64 mA IOL supports direct connection to unterminated transmission lines and legacy 5-V bus standards. |
| Glitch-free select control | SAB/SBA logic prevents transient invalid states during transitions between real-time and registered data modes - critical for deterministic bus arbitration. |
| Distributed power/ground pins | Eight VCC and eight GND pins reduce impedance in the supply network, lowering ∆I/∆t-induced noise and improving signal integrity at 125 MHz. |
| Power-up/down high-impedance safety | OE tied to VCC via pull-up resistor ensures outputs remain tri-stated during power sequencing - prevents bus conflicts in multi-voltage systems. |
Applications
| Industrial Backplane Interface | Memory-Mapped I/O Buffering |
|---|---|
Use Scenario: Isolating CPU local bus from peripheral expansion slots in programmable logic controllers (PLCs) with hot-plug capability. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing address/data strobes and control signals between processor and modular I/O cards. Use Value: Enables glitch-free bus handoff during card insertion/removal using SAB/SBA-selectable stored vs. real-time data paths. |
Use Scenario: Interfacing microcontroller GPIO banks to external SRAM or FPGA configuration memory with timing-critical setup/hold windows. IC Role / Device Role / Timing Role: Registered bus transceiver providing clock-aligned data capture (tsu = 3 ns, th = 0 ns) and low-latency forwarding (tPLH ≤ 4.9 ns). Use Value: Meets tight timing budgets for 125-MHz synchronous memory access while absorbing skew between controller and memory devices. |
| Test Equipment Data Acquisition Bus | Legacy System Protocol Bridge |
Use Scenario: Aggregating sensor data streams from multiple ADC modules onto a centralized processing bus in automated test systems. IC Role / Device Role / Timing Role: Dual 8-bit transceiver capturing parallel samples into internal registers before synchronized burst transfer to host interface. Use Value: Eliminates need for external FIFOs by leveraging on-chip storage and precise clock-edge sampling (CLKAB↑/CLKBA↑). |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microprocessor buses in avionics maintenance equipment requiring backward compatibility. IC Role / Device Role / Timing Role: Level-shifting, direction-controlled, registered transceiver supporting 5-V tolerant I/O and deterministic bus turnaround timing. Use Value: Maintains signal integrity across mixed-voltage domains while meeting MIL-STD-883 latch-up immunity (>500 mA) for mission-critical reliability. |
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 |
|---|---|---|---|
| SN74ABT162245DGGR | No internal registers; only 3-state transceiver function - lacks CLKAB/CLKBA, SAB/SBA, and storage capability. | Suitable for simple level-shifted bus driving but cannot replace registered data capture or glitch-free multiplexing roles of SN74ABT16646DGGR. | Select when only bidirectional buffering is needed and clocked storage is handled externally. |
| SN74LVTH16646DGGR | Lower voltage operation (2.7–3.6 V); reduced drive (–24 mA IOH / 48 mA IOL); slower max clock (66 MHz); same pinout and logic function. | Targets low-power 3.3-V systems; not drop-in compatible in 5-V designs due to VIH/VIL thresholds and drive mismatch. | Choose for energy-constrained applications where 5-V tolerance and 125-MHz performance are not required. |
Compared with SN74ABT162245DGGR and SN74LVTH16646DGGR, the SN74ABT16646DGGR uniquely combines 125-MHz registered operation, 5-V robustness, and glitch-free select control - making it irreplaceable in deterministic, high-speed bus management where data capture timing and mode transition reliability are non-negotiable.
Availability
SN74ABT16646DGGR is available at Aetrix Electronics and suitable for industrial backplanes, memory-mapped I/O subsystems, and test equipment data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74ABT16646DGGR 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 and industrial-grade timing products.
The SN74ABT16646DGGR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for high-speed, noise-immune data routing in industrial automation, communications infrastructure, and test instrumentation.
FAQ
What is the maximum clock frequency supported by the SN74ABT16646DGGR?
The SN74ABT16646DGGR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating is confirmed in the timing requirements table of the official datasheet (SCBS212D, p.8) and applies to both CLKAB and CLKBA inputs for reliable register capture and synchronous bus operation.
Does the SN74ABT16646DGGR have built-in power-up protection for its outputs?
Yes - the SN74ABT16646DGGR requires OE to be tied to VCC via a pull-up resistor to ensure outputs remain in high-impedance state during power-up or power-down. This design prevents bus contention and is explicitly specified in the datasheet (p.1) as a mandatory practice for safe system integration.
Can the SN74ABT16646DGGR operate with a 3.3-V supply?
No - the SN74ABT16646DGGR is specified only for 4.5 V to 5.5 V supply operation. Its input thresholds (VIH = 2 V min, VIL = 0.8 V max), output drive strength, and internal BiCMOS structure are optimized for 5-V TTL compatibility. Using 3.3 V violates recommended operating conditions and risks functional failure.
How many independent register sections does the SN74ABT16646DGGR contain?
The SN74ABT16646DGGR contains two independent 8-bit register/transceiver sections: one for A1–A8/B1–B8 (Section 1) and another for A9–A16/B9–B16 (Section 2), each with dedicated DIR, OE, CLKAB, CLKBA, SAB, and SBA controls - enabling flexible partitioning of 16-bit data paths.
What is the thermal resistance (θJA) of the SN74ABT16646DGGR in its TSSOP-56 package?
The SN74ABT16646DGGR in the DGG (TSSOP-56) package has a junction-to-ambient thermal resistance (θJA) of 81°C/W, as specified in the Absolute Maximum Ratings table (p.6) of the datasheet. This value assumes standard JEDEC 2-layer board conditions and informs thermal design for continuous high-drive operation.
SN74ABT16646DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-TFSOP (0.240", 6.10mm 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-TSSOP
SN74ABT16646DGGR FAQ
1.How can I place an order for SN74ABT16646DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16646DGGR 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 SN74ABT16646DGGR reliable?
The price and inventory of SN74ABT16646DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16646DGGR is usually 5 days.
3.What payment methods are accepted for SN74ABT16646DGGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT16646DGGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT16646DGGR?
SN74ABT16646DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16646DGGR 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 SN74ABT16646DGGR?
For technical support, including SN74ABT16646DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16646DGGR requirements.
6.How does Aetrix verify that SN74ABT16646DGGR is sourced from the original manufacturer or authorized distributors?
All SN74ABT16646DGGR 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 SN74ABT16646DGGR meets industry standards.
7.What is the process for return or replacement of SN74ABT16646DGGR?
All SN74ABT16646DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16646DGGR, 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 SN74ABT16646DGGR part is unused and in its original packaging.
Return procedure for SN74ABT16646DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT16646DGGR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
