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Texas Instruments SN74ALVTH16821VR
- Part No.:
- SN74ALVTH16821VR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVTH16821VR.pdf
- Description:
- IC FF D-TYPE DUAL 10BIT 56TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,624
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Product details
Overview
SN74ALVTH16821VR from Texas Instruments is a 20-bit bus-interface D-type flip-flop with 3-state outputs, designed for 2.5-V/3.3-V operation and mixed-mode (5-V input-tolerant) interfacing. It features edge-triggered storage on CLK↑, bus-hold inputs eliminating external pull resistors, and high-drive capability of –32/64 mA at 3.3 V. It is used in high-speed backplane and memory interface applications requiring level translation and bus isolation.
For engineers reviewing the SN74ALVTH16821VR datasheet, SN74ALVTH16821VR pinout, SN74ALVTH16821VR application, or SN74ALVTH16821VR equivalent, key selection considerations include its 56-pin TVSOP (DGV) package, 150-MHz maximum clock frequency, Auto3-State functionality, power-off output disable, and guaranteed high-impedance state during power-up/down.
Technical Context
The SN74ALVTH16821VR implements two independent 10-bit sections, each with separate clock (CLK) and output-enable (OE) controls, enabling flexible partitioning as either one 20-bit or two 10-bit registers. Its Advanced BiCMOS Technology (ABT) delivers low static power dissipation while supporting TTL-level signal integrity in 5-V systems via 5-V-tolerant inputs.
It integrates distributed VCC/GND pinning to minimize switching noise, flow-through architecture for simplified PCB routing, and active bus-hold circuitry (IBHL = 75 µA, IBHH = –75 µA at 3 V) that maintains valid logic states on floating data inputs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.3 V to 3.6 V - supports dual-voltage system interoperability and eliminates need for level-shifter ICs |
| Max clock frequency | 150 MHz - enables high-throughput data latching in memory buffers and bus repeaters |
| Output drive strength | –32 mA / +64 mA at 3.3 V - drives heavy capacitive loads (e.g., long traces, multiple receivers) without signal degradation |
| Input voltage tolerance | 0 V to 5.5 V - allows direct connection to legacy 5-V logic without external clamping or translation |
| Propagation delay | tPLH/tPHL ≤ 3.6 ns (CL = 50 pF, VCC = 3.3 V) - ensures tight timing margins in synchronous bus architectures |
| Bus-hold current | IBHL = 75 µA, IBHH = –75 µA - actively sustains logic levels on unused inputs, preventing metastability in unterminated buses |
| Power-up behavior | High-impedance outputs when VCC ≤ 1.2 V - prevents bus contention during hot-insertion or staggered power sequencing |
Pinout & Package
SN74ALVTH16821VR is housed in a 56-pin Thin Very Small-Outline Package (TVSOP, JEDEC MO-194, TI designation DGV), 11.4 mm × 4.5 mm × 1.2 mm max height, with gull-wing leads and exposed metal pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control (active-low) | Independent enable for each 10-bit section; does not affect internal register state - allows concurrent data capture and selective bus release |
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Edge-sensitive latch control; synchronizes D-input sampling to system clock domain with 1.1 ns minimum hold time (data low) |
| 1D1–1D10, 2D1–2D10 | Data inputs | 20 total inputs with integrated bus-hold - eliminates need for 20 external pullup/pulldown resistors in point-to-point or stubbed bus topologies |
| 1Q1–1Q10, 2Q1–2Q10 | 3-state outputs | Auto3-State disables output when VO exceeds VCC + 0.5 V - prevents current backflow during hot-swap or voltage-rail mismatch |
| VCC, GND | Power and ground | Distributed across package (12× VCC, 12× GND pins) - reduces simultaneous switching noise and improves signal integrity at 150 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs with 2.3–3.6-V VCC supply - enables seamless interface between 3.3-V logic and legacy 5-V peripherals without external translators |
| Power-off output disable | Outputs enter high-Z when VCC = 0 - permits live insertion into powered backplanes without disrupting bus activity |
| Auto3-State protection | Automatic high-impedance transition when output voltage exceeds VCC + 0.5 V - prevents latch-up and reverse-current damage during voltage transients |
| Flow-through pinout | Input pins on one side, outputs on opposite side - simplifies layer routing and minimizes trace crossovers in dense PCB layouts |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robust operation in noisy industrial environments with ESD or surge events |
Applications
| Backplane Data Buffering | Memory Interface Isolation |
|---|---|
Use Scenario: High-speed parallel data transfer across multi-slot backplanes with varying power-up sequences and mixed-voltage modules. IC Role / Device Role / Timing Role: 20-bit registered buffer providing clock-domain synchronization, bus contention prevention, and voltage-level bridging between 3.3-V controllers and 5-V peripheral cards. Use Value: Eliminates need for discrete level shifters and pull resistors while guaranteeing glitch-free bus access during hot-plug events via power-off disable and Auto3-State. | Use Scenario: Interfacing a 3.3-V microprocessor to asynchronous SRAM or Flash devices operating at 5 V or sharing a common data bus with other 5-V peripherals. IC Role / Device Role / Timing Role: Bidirectional bus interface flip-flop acting as a timing-controlled, 3-state isolator with edge-triggered write-data capture and read-data staging. Use Value: Enables reliable 150-MHz burst transfers with sub-4-ns propagation delay and zero external biasing - reducing BOM count and layout area by 20+ passive components. |
| Industrial PLC I/O Expansion | Test Equipment Signal Conditioning |
Use Scenario: Modular I/O carrier boards in programmable logic controllers where field modules may be inserted or removed under power. IC Role / Device Role / Timing Role: Bus-interface register providing galvanically isolated data staging, fault-tolerant input retention (bus-hold), and controlled output enable/disable sequencing. Use Value: Prevents bus conflicts during module hot-swap via high-Z power-up behavior and eliminates floating-input failures using on-chip bus-hold - improving system uptime and diagnostic reliability. | Use Scenario: Automated test equipment requiring precise timing alignment of stimulus signals to DUT inputs while maintaining signal integrity across variable load conditions. IC Role / Device Role / Timing Role: Precision clocked buffer generating clean, slew-controlled, high-drive outputs synchronized to system trigger clocks. Use Value: Delivers <0.8 V output ground bounce at 3.3 V and ±64 mA drive - ensuring accurate voltage thresholds and stable logic transitions even under 50-pF capacitive loading. |
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 |
|---|---|---|---|
| SN74ALVCH16821GR | Same pinout (56-pin TSSOP), but uses ALVC instead of ALVTH core - lower drive (–24/24 mA), no 5-V input tolerance, no Auto3-State | Suitable only for pure 3.3-V systems without hot-swap or mixed-voltage requirements | Select when cost sensitivity outweighs mixed-mode capability and higher drive is unnecessary |
| SN74LVC16374DGGR | 56-pin TSSOP, LVC family - 3.3-V-only, no 5-V tolerance, no bus-hold, no Auto3-State, lower ICC (1.5 mA typical) | Targeted at low-power, space-constrained applications with no bus contention or hot-swap needs | Choose for battery-powered or thermally constrained designs where full ALVTH feature set is over-spec |
Compared with SN74ALVCH16821GR and SN74LVC16374DGGR, the SN74ALVTH16821VR uniquely combines 5-V-tolerant inputs, Auto3-State, bus-hold, and –32/64 mA drive - making it the only option among the three qualified for mixed-voltage backplane buffering with live-insertion support.
Availability
SN74ALVTH16821VR is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory subsystem interfaces, automated test equipment, and telecom line-card designs requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALVTH16821VR 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 connectivity technologies, with decades of heritage in logic and interface solutions.
The SN74ALVTH16821VR belongs to TI's Advanced Low-Voltage BiCMOS (ALVTH) logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in mission-critical industrial and communications infrastructure.
FAQ
What is the operating temperature range for the SN74ALVTH16821VR?
The SN74ALVTH16821VR is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is explicitly specified in the SCES078E datasheet and applies to all electrical and timing parameters under recommended operating conditions (VCC = 2.3 V to 3.6 V). The device does not support extended military or automotive temperature grades.
Does the SN74ALVTH16821VR support hot-plug insertion?
Yes, the SN74ALVTH16821VR supports hot-plug insertion due to its power-off output disable feature: when VCC = 0 V, all outputs automatically enter a high-impedance state. This prevents bus contention during live insertion into powered systems. Additionally, its high-impedance state during power-up (VCC ≤ 1.2 V) and Auto3-State protection further enhance hot-swap robustness.
What package type is used for the SN74ALVTH16821VR?
The SN74ALVTH16821VR uses a 56-pin Thin Very Small-Outline Package (TVSOP), designated by Texas Instruments as DGV. It measures 11.4 mm × 4.5 mm × 1.2 mm max height, conforms to JEDEC MO-194, and features gull-wing leads with an exposed thermal pad. This package is distinct from the DL (SSOP) and DGG (TSSOP) variants offered for other members of the same family.
How does the bus-hold feature work on the SN74ALVTH16821VR?
The SN74ALVTH16821VR integrates active bus-hold circuitry on all 20 data inputs, with IBHL = 75 µA and IBHH = –75 µA at VCC = 3 V. This circuitry detects floating inputs and sources/sinks sufficient current to maintain the last-valid logic state - eliminating the need for external pullup or pulldown resistors and preventing undefined states in unterminated or stubbed bus configurations.
Is the SN74ALVTH16821VR pin-compatible with other 20-bit flip-flops in the ALVT/ALVCH families?
No, the SN74ALVTH16821VR is not pin-compatible with non-ALVTH variants such as SN74ALVCH16821GR or SN74LVC16374DGGR, despite sharing the same 56-pin TSSOP/TVSOP footprint. Differences in internal logic, OE polarity interpretation, and bus-hold implementation require validation of signal routing and timing - the SN74ALVTH16821VR must be treated as a unique pinout within its ALVTH family group.
SN74ALVTH16821VR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVTH
- Package/Case:
- 56-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 3.5ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 24mA; 32mA, 64mA
- Voltage - Supply:
- 2.3V ~ 2.7V, 3V ~ 3.6V
- Current - Quiescent (Iq):
- 100 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TVSOP
SN74ALVTH16821VR FAQ
1.How can I place an order for SN74ALVTH16821VR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVTH16821VR 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 SN74ALVTH16821VR reliable?
The price and inventory of SN74ALVTH16821VR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVTH16821VR is usually 5 days.
3.What payment methods are accepted for SN74ALVTH16821VR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVTH16821VR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVTH16821VR?
SN74ALVTH16821VR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVTH16821VR 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 SN74ALVTH16821VR?
For technical support, including SN74ALVTH16821VR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVTH16821VR requirements.
6.How does Aetrix verify that SN74ALVTH16821VR is sourced from the original manufacturer or authorized distributors?
All SN74ALVTH16821VR 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 SN74ALVTH16821VR meets industry standards.
7.What is the process for return or replacement of SN74ALVTH16821VR?
All SN74ALVTH16821VR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVTH16821VR, 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 SN74ALVTH16821VR part is unused and in its original packaging.
Return procedure for SN74ALVTH16821VR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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