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Texas Instruments SN74ALVCH162721DL
- Part No.:
- SN74ALVCH162721DL
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCH162721DL.pdf
- Description:
- IC FF D-TYPE SNGL 20BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,278
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Product details
Overview
SN74ALVCH162721DL from Texas Instruments is a 3.3-V, 20-bit edge-triggered D-type flip-flop with 3-state outputs, bus-hold inputs, and integrated 26-Ω output series resistors. It operates from 1.65 V to 3.6 V, supports 150 MHz clock frequency, and is qualified for -40°C to 85°C industrial temperature range. It serves as a high-drive, low-overshoot data register in memory interface and bus buffering applications.
For engineers reviewing the SN74ALVCH162721DL datasheet, SN74ALVCH162721DL pinout, SN74ALVCH162721DL application, or SN74ALVCH162721DL equivalent, key selection criteria include its 20-bit parallel register function, true 3-state output control via OE, CLKEN-gated clock qualification, bus-hold on all 20 data inputs, and DL-package thermal impedance of 74°C/W.
Technical Context
This device implements 20 independent D-type flip-flops sharing a common clock (CLK) and clock-enable (CLKEN) input, where data is latched only on the rising edge of CLK when CLKEN is low. The buffered output-enable (OE) controls all 20 Q outputs simultaneously, placing them in high-impedance state without affecting internal storage.
Each input features active bus-hold circuitry eliminating external pullup/pulldown resistors, and each output integrates a 26-Ω series resistor to dampen signal reflections-enabling direct connection to transmission lines or stub-loaded buses without termination components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing and low-power operation down to 1.65 V logic levels |
| Max Clock Frequency | 150 MHz - enables high-speed synchronous data capture in DDR memory buffers and address latches |
| Output Drive | ±12 mA - sufficient to drive multiple LVTTL loads or stubbed backplanes without fanout buffers |
| Propagation Delay | 5.3 ns (typ, VCC = 3.3 V) - ensures tight timing margins in sub-10 ns clock domains |
| Bus-Hold Current | ±25 µA to ±75 µA (depending on VCC) - actively maintains valid logic state on unused D inputs without external biasing |
| Input Capacitance | 3.5 pF - minimizes loading on preceding drivers and preserves signal integrity at high frequencies |
| Thermal Impedance θJA | 74°C/W (DL package) - defines power dissipation limit under natural convection for thermal design |
Pinout & Package
SN74ALVCH162721DL uses a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5 mm pitch, 13.9 mm × 7.9 mm body size, and 1.2 mm max height. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Clock input | Rising-edge trigger for all 20 flip-flops; must meet min pulse width (3.3 ns) and transition rate (10 ns/V) |
| CLKEN | Clock enable | Asynchronous gate: latching occurs only when CLKEN = L; no effect on stored data when high |
| OE | Output enable | Active-low control: Q outputs go high-Z when OE = H; does not affect internal flip-flop state |
| D1–D20 | Data inputs | 20 individual D inputs, each with bus-hold circuitry to prevent floating states |
| Q1–Q20 | Registered outputs | 20 true-level 3-state outputs, each with built-in 26-Ω series resistor for controlled edge rates |
| VCC / GND | Power terminals | Four VCC and four GND pins distributed across package for low-impedance supply routing and noise reduction |
| NC | No-connect | Pin 29 is unconnected internally - must remain unpopulated or left floating (no tie required) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 26-Ω output series resistors | Eliminates need for external source-series termination, reducing BOM count and PCB area in high-speed bus designs |
| Bus-hold on all 20 data inputs | Maintains valid logic level on unterminated or disconnected D inputs, preventing metastability and system glitches |
| Wide VCC range (1.65 V to 3.6 V) | Enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic families without level shifters |
| EPIC™ submicron CMOS process | Delivers high speed with low static current (ICC = 40 µA typ) and robust latch-up immunity (>250 mA) |
| ESD protection | Exceeds 2000 V HBM and 200 V machine model - reduces need for external ESD protection in board-level design |
Applications
| Memory Interface Buffer | Industrial Bus Transceiver |
|---|---|
Use Scenario: Latching address/data between a microcontroller and parallel SRAM or Flash memory. IC Role / Device Role / Timing Role: 20-bit registered buffer providing setup/hold time margin and isolating memory bus during write cycles. Use Value: Built-in bus-hold prevents address glitches during bus release; 3-state outputs allow shared bus arbitration without contention. | Use Scenario: Synchronizing and driving 20-bit control signals across noisy factory-floor cabling. IC Role / Device Role / Timing Role: Edge-triggered register capturing PLC output commands with precise clock alignment. Use Value: 26-Ω output resistors suppress ringing on long traces; wide VCC range accommodates 2.5 V sensor logic and 3.3 V controller I/O. |
| Test Equipment Data Capture | Automated Test Fixture Latch |
Use Scenario: Capturing parallel digital stimulus patterns from FPGA-based pattern generators. IC Role / Device Role / Timing Role: High-speed 20-bit D-flip-flop array sampling test vectors synchronized to system clock. Use Value: 150 MHz max clock and 5.3 ns tpd ensure accurate capture at >100 Mbps; low input capacitance minimizes driver loading. | Use Scenario: Holding fixture configuration bits (e.g., socket selection, voltage rail enable) during power-up sequencing. IC Role / Device Role / Timing Role: Nonvolatile latch holding static configuration until reprogrammed by host controller. Use Value: OE-controlled high-Z outputs prevent back-driving during hot-swap events; bus-hold retains state if D inputs float during reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit registered buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH162722DLR | Inverting output version (Q̅ instead of Q); identical timing, drive, and bus-hold specs | Required where downstream logic expects inverted data path or complementary signaling | Select when system-level polarity matching dictates inversion - otherwise functionally interchangeable |
| SN74LVC16374ADGGR | Same pinout, 16-bit (not 20-bit), 3.3-V only (1.65–3.6 V), no bus-hold, higher ICC (100 µA) | Suitable for 16-bit buses; lacks bus-hold so requires external biasing on unused inputs | Choose only if 16-bit width suffices and bus-hold is unnecessary; verify OE timing compatibility |
Compared with SN74ALVCH162721DL, SN74ALVCH162722DLR provides identical performance with inverted outputs, while SN74LVC16374ADGGR offers pin-compatible 16-bit functionality but omits bus-hold and has reduced voltage flexibility - making SN74ALVCH162721DL optimal for 20-bit, floating-input, wide-VCC applications.
Availability
SN74ALVCH162721DL is available at Aetrix Electronics and suitable for memory interface buffering, industrial bus synchronization, automated test fixture control, and high-speed data capture systems requiring stable component supply across extended temperature ranges.
Supply support for SN74ALVCH162721DL 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 50 years of innovation in high-reliability interface and timing products.
The SN74ALVCH162721DL belongs to TI's Widebus™ family of advanced logic devices, engineered specifically for high-speed, low-voltage parallel bus applications in industrial, communications, and test equipment where signal integrity and input robustness are critical.
FAQ
What is the maximum operating frequency of the SN74ALVCH162721DL?
The SN74ALVCH162721DL supports a maximum clock frequency of 150 MHz across its full VCC range (1.65 V to 3.6 V) and operating temperature range (-40°C to 85°C). This rating is validated per TI's SCES055G datasheet timing specifications under recommended conditions, including proper load (CL ≤ 50 pF) and input transition rates (≤10 ns/V). Performance remains consistent at 3.3 V, 2.5 V, and 1.8 V supply voltages.
Does the SN74ALVCH162721DL require external pull-up or pull-down resistors on its data inputs?
No, the SN74ALVCH162721DL does not require external pull-up or pull-down resistors on its D1–D20 inputs because it integrates active bus-hold circuitry on all 20 data inputs. This feature maintains a valid logic state (high or low) on floating or unterminated inputs, eliminating risk of metastability and reducing BOM complexity - a key differentiator versus standard LVC or LVCH logic families.
What is the purpose of the NC pin on the SN74ALVCH162721DL package?
Pin 29 of the SN74ALVCH162721DL is designated NC (No internal connection) and has no electrical function. It must remain unconnected - neither tied to VCC, GND, nor any signal. TI's datasheet explicitly states "NC − No internal connection", and the DL package outline confirms this pin is electrically isolated. Leaving it unpopulated avoids unintended coupling or mechanical stress during assembly.
How does the SN74ALVCH162721DL handle power-up and power-down sequencing?
To ensure outputs remain in high-impedance during power-up/down, TI recommends tying OE to VCC through a pull-up resistor. The minimum resistance value depends on the current-sinking capability of the OE driver - typically ≥10 kΩ for standard use. This prevents bus contention before system controllers initialize, and the SN74ALVCH162721DL's bus-hold inputs further stabilize D-line states during brown-out conditions.
Can the SN74ALVCH162721DL be used in a 2.5-V system?
Yes, the SN74ALVCH162721DL is fully specified for 2.5-V operation within its recommended 1.65 V to 3.6 V VCC range. Electrical characteristics including VOH (≥1.7 V), VOL (≤0.55 V), tpd (6.2 ns typ), and bus-hold current (±45 µA) are guaranteed at VCC = 2.5 V ± 0.2 V per the SCES055G datasheet. Its EPIC™ process ensures stable timing and drive strength across this voltage band.
SN74ALVCH162721DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 5.3ns @ 3.3V, 30pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 12mA, 12mA
- 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
SN74ALVCH162721DL FAQ
1.How can I place an order for SN74ALVCH162721DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH162721DL 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 SN74ALVCH162721DL reliable?
The price and inventory of SN74ALVCH162721DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH162721DL is usually 5 days.
3.What payment methods are accepted for SN74ALVCH162721DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH162721DL transactions.
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4.How is shipping managed for SN74ALVCH162721DL?
SN74ALVCH162721DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH162721DL 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 SN74ALVCH162721DL?
For technical support, including SN74ALVCH162721DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH162721DL requirements.
6.How does Aetrix verify that SN74ALVCH162721DL is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH162721DL 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 SN74ALVCH162721DL meets industry standards.
7.What is the process for return or replacement of SN74ALVCH162721DL?
All SN74ALVCH162721DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH162721DL, 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 SN74ALVCH162721DL part is unused and in its original packaging.
Return procedure for SN74ALVCH162721DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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