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Texas Instruments SN74ABT16821DLRG4
- Part No.:
- SN74ABT16821DLRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16821DLRG4.pdf
- Description:
- IC FF D-TYPE DUAL 10BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,385
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Product details
Overview
SN74ABT16821DLRG4 from Texas Instruments is a 20-bit bus-interface D-type flip-flop with 3-state outputs, designed for high-speed bidirectional bus buffering in industrial and embedded systems. It operates at 5 V, supports 150 MHz clock frequency, delivers ±32 mA/±64 mA output drive, and features flow-through pinout for optimized PCB layout.
For engineers reviewing the SN74ABT16821DLRG4 datasheet, SN74ABT16821DLRG4 pinout, SN74ABT16821DLRG4 application, or SN74ABT16821DLRG4 equivalent, key selection criteria include its 56-pin SSOP (DL) package, dual 10-bit or single 20-bit configuration, true-edge-triggered operation, and high-drive 3-state outputs enabling direct bus interfacing without pull-ups.
Technical Context
This device implements two independent 10-bit edge-triggered D-type flip-flop banks, each with dedicated clock (CLK) and output-enable (OE) inputs. Data is latched on the positive transition of CLK, while OE controls output impedance independently of internal state retention.
The architecture uses EPIC-IIB BiCMOS technology to achieve low ground bounce (<1 V VOLP), distributed VCC/GND pins to suppress switching noise, and a flow-through pinout that aligns inputs on one side and outputs on the opposite side - minimizing trace crossovers and signal integrity degradation in dense bus designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 20-bit D-type flip-flop with 3-state outputs; configurable as two 10-bit or one 20-bit register |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS bus environments |
| Max Clock Frequency | 150 MHz - enables high-throughput data latching in fast parallel interfaces |
| Output Drive | –32 mA IOH / +64 mA IOL - drives heavy capacitive loads (e.g., >50 pF) without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 6.7 ns (max) - ensures timing closure in sub-7 ns critical paths |
| Enable/Disable Time | tPZL/tPHZ ≤ 8.4 ns (max) - supports rapid bus turnaround in bidirectional protocols |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade system deployment |
Pinout & Package
SN74ABT16821DLRG4 is housed in a 56-pin Shrink Small-Outline Package (SSOP, DL), 300-mil body width, 0.5 mm pitch, with exposed thermal pad not present. Pin 1 is marked by a beveled corner or dot; package height ≤ 2.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables/disables respective 10-bit output banks; no effect on internal latch state |
| 1CLK, 2CLK | Clock inputs | Positive-edge-triggered; synchronizes data capture for corresponding 10-bit bank |
| 1D1–1D10, 2D1–2D10 | Data inputs | 20 individual D inputs - grouped into two 10-bit channels for flexible partitioning |
| 1Q1–1Q10, 2Q1–2Q10 | True-output terminals | 20 buffered, 3-state outputs - high-drive, low-ground-bounce, flow-through routing |
| VCC (pins 7, 22, 35, 46) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve power integrity |
| GND (pins 4, 11, 18, 25, 32, 43, 50) | Ground reference | Seven GND pins provide low-inductance return paths for high-speed switching currents |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins placed on opposite sides of package - eliminates layer jumps and reduces trace length in bus layouts |
| Distributed VCC/GND | Four VCC and seven GND pins interleaved across the package - lowers power-supply impedance and suppresses ground bounce |
| High-drive 3-state outputs | –32 mA IOH / +64 mA IOL - directly drives long traces, multiple receivers, or unterminated buses without interface components |
| Low ground bounce | VOLP < 1 V at VCC = 5 V, TA = 25°C - maintains signal integrity during simultaneous output switching |
| Widebus™ family compatibility | Pin- and function-compatible with TI Widebus portfolio - simplifies migration and design reuse across bus-width variants |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Buffer |
|---|---|
Use Scenario: Interfacing microcontroller GPIO banks to multi-slot backplane with 20-bit parallel address/data lines. IC Role / Device Role / Timing Role: SN74ABT16821DLRG4 acts as a registered bus transceiver - latching data on CLK edge and isolating bus segments via OE-controlled 3-state outputs. Use Value: Enables deterministic timing alignment across 20-bit wide paths while driving 80+ pF backplane capacitance without added drivers or termination. | Use Scenario: Isolating ECU internal logic from shared CAN/LIN subsystem data buses subject to voltage transients and EMI. IC Role / Device Role / Timing Role: SN74ABT16821DLRG4 serves as a fault-isolated bus register - holding status bits during bus arbitration and preventing noise coupling into core logic. Use Value: Leverages 2000 V HBM ESD rating and robust 5.5 V absolute max ratings to withstand automotive load-dump and jump-start conditions. |
| Test Equipment Digital Pattern Generator | Legacy Industrial Computer I/O Expansion |
Use Scenario: Generating synchronized 20-bit stimulus vectors for ASIC validation under controlled timing windows. IC Role / Device Role / Timing Role: SN74ABT16821DLRG4 functions as a precision timing register - capturing pattern data on precise CLK edges with sub-2 ns setup/hold margins. Use Value: Achieves 150 MHz operation with 1.8 ns tsu and 1.3 ns th - meets tight timing budgets for high-speed digital test vector generation. | Use Scenario: Extending ISA or PC/104 bus width in retro-computing or legacy control systems requiring 20-bit parallel I/O expansion. IC Role / Device Role / Timing Role: SN74ABT16821DLRG4 operates as a buffered I/O port register - decoupling slow CPU bus cycles from faster peripheral response times via latch staging. Use Value: Provides 3-state isolation and high-current drive to interface modern peripherals with aging 5 V bus architectures without level-shifting or bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-interface flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT16221DLR | 16-bit version; identical DL package, timing, and drive strength; lacks 4 output bits | Suitable only where 16-bit bus width suffices; not drop-in for 20-bit designs | Select when board space or BOM count optimization outweighs need for full 20-bit width |
| SN74LVC16374DGVR | 3.3 V only; lower drive (–24/+24 mA); 16-bit; different pinout and timing parameters | Requires level translation for 5 V systems; unsuitable for legacy 5 V bus environments | Prefer only in new 3.3 V designs where LVC's lower power and smaller TSSOP package are prioritized |
Compared with SN74ABT16221DLR and SN74LVC16374DGVR, SN74ABT16821DLRG4 uniquely delivers 20-bit width, 5 V compatibility, and ±32/±64 mA drive in the DL package - making it irreplaceable for industrial 5 V bus expansion where full width and robust drive are mandatory.
Availability
SN74ABT16821DLRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, digital test equipment, and legacy computer I/O expansion requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT16821DLRG4 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 and bus technologies.
SN74ABT16821DLRG4 belongs to TI's Widebus™ family of high-speed bus-interface devices, engineered specifically for robust, noise-immune parallel data transfer in industrial, computing, and communications infrastructure.
FAQ
What is the operating voltage range for SN74ABT16821DLRG4?
SN74ABT16821DLRG4 operates over a supply voltage range of 4.5 V to 5.5 V, fully compliant with standard 5 V TTL logic systems. It is not rated for 3.3 V operation, and applying voltages outside this range may cause permanent damage per absolute maximum ratings.
Does SN74ABT16821DLRG4 support both 10-bit and 20-bit configurations?
Yes, SN74ABT16821DLRG4 can be used flexibly as either two independent 10-bit flip-flop banks (using separate 1CLK/1OE and 2CLK/2OE controls) or as a unified 20-bit register (by tying both clocks and OE inputs together). This dual-mode capability is explicitly defined in the functional description and timing diagrams.
What package type does SN74ABT16821DLRG4 use, and what are its key mechanical dimensions?
SN74ABT16821DLRG4 uses the SSOP (DL) package: 56-pin, 300-mil body width, 0.5 mm lead pitch, and maximum height of 2.0 mm. Its pin 1 identifier is a beveled corner, and it features 7 GND and 4 VCC pins distributed for optimal noise suppression - confirmed in TI's official package drawing DGG0056A and packaging addendum.
How does the flow-through architecture of SN74ABT16821DLRG4 benefit PCB layout?
The flow-through architecture of SN74ABT16821DLRG4 places all inputs on one side (e.g., left) and all outputs on the opposite side (e.g., right), enabling straight-line trace routing across the package. This minimizes vias, reduces crosstalk, improves signal integrity, and simplifies high-density bus fanout - a documented design advantage highlighted in the device's logic diagram and application notes.
Is SN74ABT16821DLRG4 pin-compatible with other Widebus™ devices like SN74ABT16221?
No, SN74ABT16821DLRG4 is not pin-compatible with SN74ABT16221 due to differing pin counts (56 vs. 48), distinct pin assignments for clocks and enables, and incompatible I/O channel grouping. While both belong to the Widebus™ family and share functional similarities, their physical layouts and signal mapping differ - requiring separate footprint and schematic design.
SN74ABT16821DLRG4 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:
- Discontinued at Digi-Key
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 10
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 5.1ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 500 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ABT16821DLRG4 FAQ
1.How can I place an order for SN74ABT16821DLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16821DLRG4 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 SN74ABT16821DLRG4 reliable?
The price and inventory of SN74ABT16821DLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16821DLRG4 is usually 5 days.
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SN74ABT16821DLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16821DLRG4 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 SN74ABT16821DLRG4?
For technical support, including SN74ABT16821DLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16821DLRG4 requirements.
6.How does Aetrix verify that SN74ABT16821DLRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT16821DLRG4 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 SN74ABT16821DLRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT16821DLRG4?
All SN74ABT16821DLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16821DLRG4, 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 SN74ABT16821DLRG4 part is unused and in its original packaging.
Return procedure for SN74ABT16821DLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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