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Texas Instruments SN74ABT16821DLR
- Part No.:
- SN74ABT16821DLR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT16821DLR.pdf
- Description:
- IC FF D-TYPE DUAL 10BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
SN74ABT16821DLR from Texas Instruments is a 20-bit, edge-triggered D-type bus-interface flip-flop with 3-state outputs, designed for high-speed bidirectional bus driving in industrial and embedded systems. It operates at 4.5–5.5 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 SN74ABT16821DLR datasheet, SN74ABT16821DLR pinout, SN74ABT16821DLR application, or SN74ABT16821DLR 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 optimized for capacitive bus loading without external pull-ups.
Technical Context
This device implements two independent 10-bit D-type flip-flop banks, each with separate clock (CLK) and output-enable (OE) controls. All 20 flip-flops trigger on the positive edge of their respective clocks, latching true input data (D) to Q outputs without inversion.
Its 3-state outputs are fully decoupled from internal register operation: OE assertion places outputs in high-impedance without affecting data retention or new data capture. The flow-through pinout and distributed power/ground layout minimize signal skew and ground bounce-VOLP < 1 V at 5 V and 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 20-bit edge-triggered D-type flip-flop with independent 3-state control per bank |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and ABT logic families |
| Max Clock Frequency | 150 MHz - enables high-throughput data latching in fast parallel bus interfaces |
| Output Drive | –32 mA IOH, +64 mA IOL - drives heavy capacitive loads directly, eliminating need for external buffers |
| Propagation Delay | tPLH/tPHL ≤ 6.7 ns - guarantees sub-7-ns timing margin for 150-MHz operation with 50-pF load |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and automation applications |
| ESD Protection | >2000 V HBM, >200 V MM - enhances robustness in handling and board-level assembly environments |
Pinout & Package
SN74ABT16821DLR uses a 56-pin Shrink Small-Outline Package (SSOP, DL), 300-mil body width, 0.5-mm lead pitch, 1.2-mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables/disables corresponding 10-bit output bank; no effect on internal register state |
| 1CLK, 2CLK | Positive-edge clock inputs | Simultaneously latch all 10 D inputs in respective bank on rising edge |
| 1D1–1D10, 2D1–2D10 | Data inputs | Asynchronous inputs routed to internal D latches; unaffected by OE state |
| 1Q1–1Q10, 2Q1–2Q10 | True-output terminals | Edge-triggered registered outputs; tri-stated when OE = high |
| VCC, GND | Power distribution network | Multiple distributed VCC and GND pins reduce simultaneous switching noise and improve signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive 3-State Outputs | –32 mA / +64 mA drive capability eliminates need for external bus drivers or pull-up resistors |
| Distributed Power/Ground Pins | Reduces ground bounce (VOLP < 1 V) and improves noise immunity in high-speed switching |
| Flow-Through Pinout | Input-to-output signal path alignment minimizes PCB trace length and crosstalk in dense layouts |
| Widebus™ Architecture | Optimized for parallel bus buffering, I/O port expansion, and parity-handling register applications |
| EPIC-IIB BiCMOS Process | Combines bipolar speed and CMOS low static power - ICC disabled < 500 µA at 5.5 V |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to high-capacitance backplane buses in programmable logic controllers. IC Role / Device Role / Timing Role: 20-bit registered buffer providing synchronized, noise-immune data transfer between CPU and peripheral modules. Use Value: High-drive outputs drive 100+ pF backplane traces directly; flow-through pinout simplifies routing and reduces layer count. | Use Scenario: Expanding digital I/O capacity for door lock, lighting, and sensor monitoring in automotive BCMs. IC Role / Device Role / Timing Role: Dual-bank 10-bit register enabling independent control of input sampling and output latching under ECU timing constraints. Use Value: –40°C to +85°C rating ensures reliability across vehicle thermal zones; 3-state isolation prevents bus contention during sleep/wake transitions. |
| Test Equipment Digital Pattern Generator | Legacy Industrial Communication Adapter |
Use Scenario: Generating synchronized multi-bit stimulus waveforms for functional testing of ASICs and FPGAs. IC Role / Device Role / Timing Role: Precision-timed 20-bit data latch triggered by system clock, feeding parallel test vectors into DUT interface. Use Value: 1.3 ns setup/1.3 ns hold time and 6.1 ns max tPHL support deterministic 150-MHz pattern rates with tight timing margins. | Use Scenario: Bridging modern microcontrollers to legacy parallel peripherals like dot-matrix displays or ISA-style expansion cards. IC Role / Device Role / Timing Role: Bus-interface register translating between MCU-native timing and slower, capacitively loaded legacy bus protocols. Use Value: 3-state outputs allow bidirectional bus sharing; high noise immunity tolerates long cable runs and EMI-prone factory floors. |
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 |
|---|---|---|---|
| SN74ABT16222DLR | 16-bit version, identical DL package, same voltage/timing specs but reduced channel count | Suitable where only 16-bit bus width is required; lower pin count eases layout but lacks 20-bit granularity | Select when BOM consolidation or footprint reuse with 16-bit variants is prioritized over full 20-bit width |
| SN74ALVCH16222ADLR | 16-bit, 3.3-V only (1.65–3.6 V), lower drive (–24/+24 mA), different timing parameters | Targeted for low-voltage mixed-signal systems; incompatible with 5-V buses without level translation | Choose only for 3.3-V domains requiring ALVC speed/power trade-off; not drop-in for 5-V SN74ABT16821DLR designs |
Compared with SN74ABT16821DLR, SN74ABT16222DLR offers identical 5-V operation and package but fewer bits, while SN74ALVCH16222ADLR shifts to 3.3-V logic with reduced drive and timing - neither is pin-compatible, and both require schematic and layout revision for substitution.
Availability
SN74ABT16821DLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, automated test equipment, and legacy communication adapters requiring stable component supply across extended temperature ranges.
Supply support for SN74ABT16821DLR 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 industrial and automotive ICs.
SN74ABT16821DLR belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for noise-resilient, high-drive parallel data transfer in demanding industrial and instrumentation applications.
FAQ
What is the operating voltage range for SN74ABT16821DLR?
The SN74ABT16821DLR operates from 4.5 V to 5.5 V. This 5-V nominal range ensures compatibility with legacy TTL and ABT logic families, supports robust noise margins, and aligns with industrial power rail standards. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings.
Does SN74ABT16821DLR support independent control of its two 10-bit banks?
Yes, SN74ABT16821DLR provides fully independent control: each 10-bit bank has its own clock (1CLK/2CLK) and output-enable (1OE/2OE) inputs. This allows asynchronous latching and 3-state control - for example, one bank can hold data while the other updates, or outputs can be isolated independently during bus arbitration.
What package type and dimensions does SN74ABT16821DLR use?
SN74ABT16821DLR uses a 56-pin Shrink Small-Outline Package (SSOP, DL) with 300-mil body width, 0.5-mm lead pitch, and 1.2-mm maximum height. Its JEDEC MO-153 compliant outline measures 13.9–14.1 mm × 6.0–6.2 mm, and it ships in 1000-unit tape-and-reel format (reel width 32.0 mm, quadrant Q1).
Can SN74ABT16821DLR drive a 100-pF bus load at 150 MHz?
Yes, SN74ABT16821DLR is characterized for 150 MHz operation with CL = 50 pF, and its ±32 mA/±64 mA drive strength enables reliable signaling into >100-pF loads. Real-world performance depends on trace impedance and termination, but the device's low output impedance and distributed power/ground structure maintain signal integrity under such conditions.
Is SN74ABT16821DLR pin-compatible with SN74ABT16821DGGR?
No, SN74ABT16821DLR (DL package) and SN74ABT16821DGGR (DGG package) share identical logic functionality and pin functions, but differ in physical dimensions, lead pitch (0.5 mm vs. 0.4 mm), and body size - making them mechanically incompatible without PCB redesign. Both are 56-pin packages but not interchangeable on the same footprint.
SN74ABT16821DLR 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
- 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
SN74ABT16821DLR FAQ
1.How can I place an order for SN74ABT16821DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT16821DLR 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 SN74ABT16821DLR reliable?
The price and inventory of SN74ABT16821DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT16821DLR is usually 5 days.
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Once your SN74ABT16821DLR 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 SN74ABT16821DLR?
For technical support, including SN74ABT16821DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT16821DLR requirements.
6.How does Aetrix verify that SN74ABT16821DLR is sourced from the original manufacturer or authorized distributors?
All SN74ABT16821DLR 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 SN74ABT16821DLR meets industry standards.
7.What is the process for return or replacement of SN74ABT16821DLR?
All SN74ABT16821DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT16821DLR, 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 SN74ABT16821DLR part is unused and in its original packaging.
Return procedure for SN74ABT16821DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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