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Texas Instruments SN74ABT16821DL
- Part No.:
- SN74ABT16821DL
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16821DL.pdf
- Description:
- IC FF D-TYPE DUAL 10BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,485
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Product details
Overview
SN74ABT16821DL 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 computing systems. It operates at 5 V, supports 150 MHz clock frequency, delivers ±32 mA/±64 mA output drive, and features distributed VCC/GND pins to suppress switching noise.
For engineers reviewing the SN74ABT16821DL datasheet, SN74ABT16821DL pinout, SN74ABT16821DL application, or SN74ABT16821DL 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, and OE controls all ten outputs per bank simultaneously into high-impedance state without affecting internal register state.
The architecture uses EPIC-IIB BiCMOS process for low power dissipation and high noise immunity. Distributed power/ground pin layout and flow-through pin arrangement minimize trace crosstalk and optimize PCB routing for high-density backplane or motherboard applications.
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 - ensures compatibility with standard 5-V TTL and CMOS buses |
| Max Clock Frequency | 150 MHz - enables high-throughput data latching in fast I/O 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) - guarantees sub-7 ns timing margin for 150-MHz operation |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing environments |
| ESD Protection | >2000 V HBM, >200 V MM - robust handling during board assembly and field service |
Pinout & Package
SN74ABT16821DL is housed in a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5-mm lead pitch, 13.9 mm × 6.0 mm body size, and 1.2-mm max height. The package features symmetric pin 1 quadrant orientation and is RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control (active-low) | Independent enable for each 10-bit bank; asserts high-impedance on all Q outputs without affecting internal latch state |
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Synchronizes data capture from D inputs to Q outputs; no internal clock distribution delay between banks |
| 1D1–1D10, 2D1–2D10 | Data inputs | 20 individual D inputs - accepts asynchronous data prior to clock edge; no setup/hold dependency across banks |
| 1Q1–1Q10, 2Q1–2Q10 | True-output terminals | 20 buffered, 3-state outputs - each capable of –32 mA sink / +64 mA source into bus lines |
| VCC (pins 7, 22, 36, 47, 50) | Power supply | Five distributed VCC pins reduce simultaneous switching noise and improve power integrity across wide bus |
| GND (pins 4, 11, 18, 25, 33, 40, 45) | Ground reference | Seven GND pins provide low-inductance return paths and support clean signal integrity for all 20 outputs |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive 3-State Outputs | –32 mA IOH / +64 mA IOL eliminates need for external bus drivers or pull-up resistors in 5-V systems |
| Distributed Power/Ground Pins | 5 VCC + 7 GND pins minimize ground bounce (VOLP < 1 V) and ensure stable timing under full-load switching |
| Flow-Through Pin Architecture | Input-to-output signal path traverses package linearly - simplifies layer stacking and reduces trace length mismatch |
| Widebus™ Compatibility | Fully interoperable with TI's Widebus family timing and logic levels - enables drop-in replacement in existing 20-bit buffer designs |
| Industrial Temperature Range | –40°C to +85°C operation - validated for use in programmable logic controllers, server I/O modules, and industrial backplanes |
Applications
| Industrial Backplane Interface | Server Memory Buffer |
|---|---|
|
Use Scenario: Interfacing FPGA-based control logic to parallel address/data buses in modular PLC chassis. IC Role / Device Role / Timing Role: 20-bit registered bus transceiver providing synchronized, noise-immune data transfer between processor and I/O modules. Use Value: High-drive outputs directly drive 30-cm, 50-pF backplane traces at 100+ MHz without termination or repeaters. |
Use Scenario: Latching memory command/address signals between CPU and DDR SDRAM controller in enterprise storage servers. IC Role / Device Role / Timing Role: Edge-triggered register holding burst-mode control signals with precise setup/hold timing (tsu = 1.8 ns, th = 1.3 ns). Use Value: Enables reliable 150-MHz clock domain crossing while maintaining signal integrity across multi-layer motherboard routing. |
| Test Equipment Digital I/O Module | Automated Test Fixture Controller |
|
Use Scenario: Providing programmable, isolated digital stimulus and response capture in ATE rack-mounted cards. IC Role / Device Role / Timing Role: Dual 10-bit register buffering pattern generator outputs and capturing DUT response with deterministic latency. Use Value: Independent OE control allows dynamic bus sharing between multiple test channels without hardware reconfiguration. |
Use Scenario: Managing parallel control lines (enable, reset, mode select) for multi-sensor industrial fixtures. IC Role / Device Role / Timing Role: Synchronized register holding fixture configuration bits, updated only on clock edge to prevent metastability. Use Value: Robust ESD protection (>2000 V HBM) ensures reliability during frequent probe contact and cable hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit bus-interface flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT16821DGGR | Same logic function and timing, but in 56-pin TSSOP (DGG) package with 0.65-mm pitch and 2000-piece tape-and-reel packaging | Preferred for automated SMT assembly with higher volume and finer-pitch board layouts | Select SN74ABT16821DGGR when using pick-and-place equipment optimized for TSSOP; SN74ABT16821DL remains optimal for tube-based prototyping or low-volume DL-compatible designs |
| SN74ALVCH16821DL | Lower-voltage 3.3-V operation (1.65–3.6 V), reduced drive (–24/+24 mA), and higher input capacitance (5.5 pF vs. 3.5 pF) | Suitable for mixed-voltage systems where 5-V tolerance is not required and lower power is prioritized | Choose SN74ALVCH16821DL only if migrating to 3.3-V infrastructure; SN74ABT16821DL maintains full 5-V TTL compatibility and superior drive for legacy bus loading |
Compared with SN74ABT16821DGGR, SN74ABT16821DL offers identical electrical performance in a through-hole-compatible SSOP package ideal for manual assembly and validation. Against SN74ALVCH16821DL, it provides higher noise margin, stronger drive, and guaranteed 5-V operation - critical for industrial bus integrity.
Availability
SN74ABT16821DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, server memory buffers, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT16821DL 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74ABT16821DL belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for noise-resilient, high-drive 5-V parallel bus applications in demanding industrial and computing environments.
FAQ
What is the maximum clock frequency supported by the SN74ABT16821DL?
The SN74ABT16821DL supports a maximum clock frequency of 150 MHz across its full operating temperature range (–40°C to +85°C), verified under recommended conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF). This rating is guaranteed by TI's characterization and appears in the official SCBS216B datasheet timing tables.
Does the SN74ABT16821DL support independent clocking of its two 10-bit sections?
Yes, the SN74ABT16821DL has two separate clock inputs - 1CLK for the first 10-bit bank and 2CLK for the second - allowing fully independent synchronization of data latching. Each bank also has its own output-enable (1OE/2OE), enabling asymmetric bus control without shared timing constraints.
Can the SN74ABT16821DL be used in a 3.3-V system?
No - the SN74ABT16821DL is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive characteristics are optimized for 5-V TTL compatibility. For 3.3-V systems, TI recommends the SN74ALVCH16821DL instead.
How does the SN74ABT16821DL handle power-up sequencing to avoid bus contention?
To ensure high-impedance outputs during power-up, TI specifies that OE should be tied to VCC via a pull-up resistor. The minimum resistance value depends on the driver's current-sinking capability; this prevents unintended logic states on the bus before system initialization completes - a requirement explicitly stated in the SN74ABT16821DL datasheet.
Is the SN74ABT16821DL pin-compatible with other members of the ABT16821 family?
Yes - the SN74ABT16821DL shares identical pinout and functionality with SN74ABT16821DGGR and SN54ABT16821WD. All variants use the same 56-pin mapping, including dual OE/CLK sets, distributed power/ground pins, and flow-through I/O arrangement, enabling mechanical interchangeability within the same package footprint constraints.
SN74ABT16821DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74ABT16821DL FAQ
1.How can I place an order for SN74ABT16821DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16821DL 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 SN74ABT16821DL reliable?
The price and inventory of SN74ABT16821DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16821DL is usually 5 days.
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SN74ABT16821DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT16821DL 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 SN74ABT16821DL?
For technical support, including SN74ABT16821DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16821DL requirements.
6.How does Aetrix verify that SN74ABT16821DL is sourced from the original manufacturer or authorized distributors?
All SN74ABT16821DL 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 SN74ABT16821DL meets industry standards.
7.What is the process for return or replacement of SN74ABT16821DL?
All SN74ABT16821DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16821DL, 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 SN74ABT16821DL part is unused and in its original packaging.
Return procedure for SN74ABT16821DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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