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Texas Instruments SN74ALVCH16721DLR
- Part No.:
- SN74ALVCH16721DLR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCH16721DLR.pdf
- Description:
- IC FF D-TYPE SNGL 20BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,480
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Product details
Overview
SN74ALVCH16721DLR from Texas Instruments is a 3.3-V, 20-bit edge-triggered D-type flip-flop with 3-state outputs, bus-hold inputs, and qualified clock storage. It operates across 1.65 V to 3.6 V supply range, supports up to 150 MHz clock frequency, and features ±24 mA output drive at 3 V. It is used in high-speed data latching and bus interface applications in industrial and communications systems.
For engineers reviewing the SN74ALVCH16721DLR datasheet, SN74ALVCH16721DLR pinout, SN74ALVCH16721DLR application, or SN74ALVCH16721DLR equivalent, key selection criteria include its 56-pin SSOP (DL) package, dual control inputs (CLKEN and OE), true-edge-triggered storage behavior, and bus-hold functionality eliminating external biasing components.
Technical Context
The SN74ALVCH16721DLR implements 20 independent D-type flip-flops with synchronous positive-edge clock triggering and clock-enable qualification. Each channel stores data only when CLKEN is low and samples on CLK rising edge - no metastability tolerance or asynchronous reset is provided.
Its 3-state outputs are controlled by an active-low buffered OE input that does not affect internal state retention; outputs enter high-impedance mode independently of clock or data activity. Bus-hold circuitry on all 20 data inputs maintains valid logic levels without external resistors, supporting floating-bus robustness in hot-swap or partial-population scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65 V to 3.6 V - enables interoperability with mixed-voltage 1.8 V/2.5 V/3.3 V digital systems |
| Max Clock Frequency | 150 MHz - supports high-throughput data capture in memory interfaces and parallel buses |
| Output Drive | ±24 mA at VCC = 3 V - drives standard 50 Ω transmission lines or multiple CMOS loads without buffers |
| Propagation Delay | 4.3 ns typical at 3.3 V - ensures tight timing margins in synchronous latch chains |
| Input Bus-Hold | Integrated on all 20 D inputs - eliminates need for 40 external pullup/pulldown resistors |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments without derating |
| I/O Capacitance | 6 pF (inputs), 7 pF (outputs) - minimizes signal loading and improves high-frequency integrity |
Pinout & Package
SN74ALVCH16721DLR 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 lead finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Clock input | Positive-edge trigger for all 20 flip-flops; requires clean, monotonic transition per JEDEC timing specs |
| CLKEN | Clock enable | Active-low qualifier: data latched only when CLKEN = L; high disables storage regardless of CLK |
| OE | Output enable | Active-low control: Q outputs go high-Z when OE = H; internal state unaffected during high-Z |
| D1–D20 | Data inputs | 20 individual D inputs, each with integrated bus-hold to retain last-valid logic level if undriven |
| Q1–Q20 | Registered outputs | True outputs reflecting stored D values; tri-stated simultaneously under OE control |
| VCC / GND | Power terminals | Four VCC and four GND pins distributed across package to reduce simultaneous switching noise and IR drop |
Key Features
| Feature | Design Value |
|---|---|
| Widebus™ architecture | Optimized for high-speed parallel bus interfacing with matched propagation delays across all 20 channels |
| EPIC™ submicron process | Delivers low dynamic power (59 pF typical Cpd) and high noise immunity (2000 V HBM ESD) |
| Bus-hold on all D inputs | Eliminates 40 discrete pullup/pulldown resistors, reducing BOM count and PCB area in dense layouts |
| Qualified clock storage | Ensures deterministic sampling: data captured only when CLKEN is asserted low before CLK edge |
| High-impedance output control | OE allows live bus sharing - outputs float cleanly without leakage or contention during system reconfiguration |
Applications
| Parallel Memory Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Latching address/data from microcontroller to SRAM or FIFO buffer in burst-mode transfers. IC Role / Device Role / Timing Role: 20-bit registered interface synchronizing asynchronous CPU writes to memory clock domain. Use Value: 4.3 ns tpd and 150 MHz fmax enable single-cycle write setup in 3.3 V systems with minimal timing margin overhead. | Use Scenario: Isolating and buffering 20-channel digital I/O between field sensors and controller backplane. IC Role / Device Role / Timing Role: Input register capturing real-time sensor states; output register driving actuators via shared bus. Use Value: Bus-hold on D inputs prevents floating inputs during sensor disconnect; OE enables safe hot-swap of I/O modules. |
| Telecom Line Card Buffering | Test Equipment Signal Conditioning |
Use Scenario: Temporarily storing 20-bit status flags from line interface units before serial conversion. IC Role / Device Role / Timing Role: Edge-triggered storage element aligning parallel status bits to system clock for JTAG or SPI readout. Use Value: Dual control (CLKEN + OE) allows selective capture and conditional output enabling - critical for multi-slot synchronization. | Use Scenario: Capturing parallel test vectors from pattern generator and holding stable during DUT evaluation phase. IC Role / Device Role / Timing Role: Synchronous latch providing glitch-free, noise-immune signal staging prior to device under test stimulus. Use Value: ±24 mA drive strength directly drives 50 Ω coaxial cables or multiple logic inputs without fanout buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit registered bus-interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH162244DLR | 20-bit non-inverting buffer (no storage); lacks CLK/CLKEN; only OE control | Suitable for level-shifting or fanout only - cannot replace clocked latching function | Select only when storage is unnecessary and pure signal buffering is required |
| SN74LVCH16374ADLR | Same 20-bit D-flip-flop function but LV family: 2.7–3.6 V range only; no bus-hold; higher tpd (5.8 ns) | Compatible for 3.3 V-only designs where bus-hold is handled externally | Prefer when lower static current (ICC = 10 µA) outweighs need for bus-hold and wider voltage range |
Compared with SN74ALVCH16721DLR, SN74ALVCH162244DLR omits clocked storage entirely, while SN74LVCH16374ADLR narrows supply range and removes bus-hold - both require layout or schematic changes to substitute, and neither offers identical functional coverage.
Availability
SN74ALVCH16721DLR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, telecom line card buffering, and parallel memory interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ALVCH16721DLR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALVCH16721DLR belongs to TI's Widebus™ family of high-speed, low-voltage bus-interface ICs designed specifically for robust, noise-immune parallel data transfer in 1.65–3.6 V systems.
FAQ
What is the recommended power-up sequence for SN74ALVCH16721DLR?
TI recommends tying OE to VCC through a pullup resistor at power-up to ensure outputs remain in high-impedance state until system initialization completes. The SN74ALVCH16721DLR has no internal power-on reset; uncontrolled OE during ramp-up may cause bus contention. This precaution applies regardless of CLK or CLKEN state, and is documented in the SCES052E datasheet section "To ensure the high-impedance state during power up or power down".
Does SN74ALVCH16721DLR support mixed-voltage operation between inputs and outputs?
Yes - SN74ALVCH16721DLR supports mixed-voltage operation: inputs tolerate VI up to VCC + 0.5 V (absolute max 4.6 V), and outputs swing rail-to-rail (0 to VCC). This allows interfacing with 1.8 V or 2.5 V controllers while powered at 3.3 V, provided input thresholds (VIH/VIL) are met per operating VCC. No level-shifter is needed for such configurations.
Can SN74ALVCH16721DLR be used without external pullup/pulldown resistors on D inputs?
Yes - SN74ALVCH16721DLR includes active bus-hold circuitry on all 20 D inputs, which maintains the last-valid logic state when inputs float. This eliminates the need for external pullup or pulldown resistors in most applications, reducing component count and board space. Bus-hold current is specified at ±75 µA maximum at 3 V, ensuring reliable retention without excessive power draw.
What is the thermal performance of SN74ALVCH16721DLR in its DL package?
The SN74ALVCH16721DLR in the DL (SSOP) package has a junction-to-ambient thermal resistance (θJA) of 74°C/W, measured per JESD 51. At full 20-channel toggle (59 pF Cpd, 10 MHz), typical power dissipation is ~1.8 mW, resulting in negligible junction temperature rise (<0.2°C) in still air. Derating is unnecessary below 85°C ambient for standard industrial use.
Is SN74ALVCH16721DLR pin-compatible with other 56-pin Widebus™ flip-flops?
No - SN74ALVCH16721DLR has a unique pinout optimized for 20-bit D/Q separation and distributed power/ground. It is not pin-compatible with SN74ALVCH16374 or SN74ALVCH162244, which differ in control signal placement (e.g., separate CLK/CLKEN vs. single CLK), terminal count per function group, and power pin distribution. Layout reuse requires verification against the DL-package top-view diagram in SCES052E.
SN74ALVCH16721DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- 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:
- 1
- Number of Bits per Element:
- 20
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 4.3ns @ 3.3V, 30pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Current - Quiescent (Iq):
- 40 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ALVCH16721DLR FAQ
1.How can I place an order for SN74ALVCH16721DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH16721DLR 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 SN74ALVCH16721DLR reliable?
The price and inventory of SN74ALVCH16721DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16721DLR is usually 5 days.
3.What payment methods are accepted for SN74ALVCH16721DLR?
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4.How is shipping managed for SN74ALVCH16721DLR?
SN74ALVCH16721DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH16721DLR 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 SN74ALVCH16721DLR?
For technical support, including SN74ALVCH16721DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16721DLR requirements.
6.How does Aetrix verify that SN74ALVCH16721DLR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH16721DLR 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 SN74ALVCH16721DLR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH16721DLR?
All SN74ALVCH16721DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16721DLR, 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 SN74ALVCH16721DLR part is unused and in its original packaging.
Return procedure for SN74ALVCH16721DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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