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Nexperia USA Inc. 74ALVCH16821DL,518
- Part No.:
- 74ALVCH16821DL,518
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Flip Flops
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ALVCH16821DL,518.pdf
- Description:
- IC FF D-TYPE DUAL 10BIT 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,122
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Product details
Overview
74ALVCH16821DL,518 from Nexperia is a 20-bit bus-interface D-type flip-flop with dual 10-bit edge-triggered registers, positive-edge clocking, independent 3-state output enables (1OE/2OE), bus-hold inputs, and operation across 1.2 V to 3.6 V supply. It delivers 24 mA drive at 3.0 V, supports 350 MHz max clock frequency at 3.3 V, and is used in high-speed data latching and bus isolation in industrial control backplanes.
For engineers reviewing the 74ALVCH16821DL,518 datasheet, 74ALVCH16821DL,518 pinout, 74ALVCH16821DL,518 application, or 74ALVCH16821DL,518 equivalent, this device serves as a low-voltage, high-drive, noise-immune register for bidirectional bus buffering, memory address latching, and synchronous data capture where setup/hold timing margins and bus stability without external resistors are critical.
Technical Context
The device implements two independent 10-bit D-type registers, each with dedicated rising-edge clock (1CP/2CP) and active-low output enable (1OE/2OE). Data on D inputs is captured one setup time before the LOW-to-HIGH clock transition and appears at Q outputs only when OE is LOW; otherwise outputs enter high-impedance state without affecting internal latch states.
It integrates bus-hold circuitry on all 20 data inputs (1D0–1D9, 2D0–2D9), eliminating need for external pull resistors. The TSSOP56 package features multiple VCC/GND pins (4×VCC, 8×GND) to minimize ground bounce and inductive noise, supporting stable operation into 50 Ω transmission lines at 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.2 V to 3.6 V - Enables direct interface with 1.2 V, 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Max clock frequency | 350 MHz at VCC = 3.3 V - Supports high-throughput data capture in fast parallel interfaces like legacy PCI or memory controllers. |
| Propagation delay (tpd) | 4.5 ns max at VCC = 3.3 V - Ensures tight timing closure in systems with sub-5 ns cycle budgets. |
| Output drive strength | ±24 mA at VCC = 3.0 V - Drives 50 Ω transmission lines directly, reducing need for external buffers in point-to-point interconnects. |
| Set-up / hold time | 0.2 ns setup / 0.4 ns hold at VCC = 3.3 V - Allows reliable sampling of fast data edges with minimal timing margin overhead. |
| Bus-hold current | ±75 μA typical at VCC = 3.0 V - Maintains valid logic levels on floating inputs, preventing metastability in unconnected or tri-stated buses. |
| Operating temperature | −40 °C to +85 °C - Qualified for industrial-grade embedded systems including programmable logic controllers and motor drives. |
Pinout & Package
TSSOP56 package (SOT364-1), 56-pin plastic thin shrink small outline, 6.1 mm body width, 1.2 mm max height, with 4 VCC and 8 GND pins for low-noise power distribution.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CP, 2CP (pins 56, 29) | Rising-edge clock inputs | Trigger independent 10-bit registers on LOW-to-HIGH transition; require clean, monotonic edges to avoid double-clocking. |
| 1OE, 2OE (pins 1, 28) | Active-low output enable | Enable/disable corresponding 10-bit output group independently; HIGH forces high-impedance, preserving register state. |
| 1D0–1D9 (pins 55,54,52,51,49,48,47,45,44,43) | Data inputs, section 1 | Sampled on 1CP rising edge; include bus-hold to prevent floating states during bus contention or idle periods. |
| 2D0–2D9 (pins 42,41,40,38,37,36,34,33,31,30) | Data inputs, section 2 | Sampled on 2CP rising edge; electrically isolated from section 1 except shared VCC/GND rails. |
| 1Q0–1Q9 (pins 2,3,5,6,8,9,10,12,13,14) | Data outputs, section 1 | 3-state outputs enabled by 1OE; capable of driving 50 Ω loads with <4.5 ns propagation delay at 3.3 V. |
| 2Q0–2Q9 (pins 15,16,17,19,20,21,23,24,26,27) | Data outputs, section 2 | 3-state outputs enabled by 2OE; identical timing and drive specs to section 1; supports split-bus architectures. |
| VCC (pins 7,22,35,50) | Power supply | Four distributed supply pins reduce IR drop and improve transient response; must be decoupled locally with 100 nF ceramic capacitors. |
| GND (pins 4,11,18,25,32,39,46,53) | Ground reference | Eight ground pins minimize ground loop inductance and suppress simultaneous switching noise in high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| MULTIBYTE™ flow-through pinout | Input/output pairs aligned across package width (e.g., 1D0/1Q0 adjacent) simplifies PCB routing and reduces trace length mismatch in parallel buses. |
| Bus-hold on all 20 data inputs | Eliminates need for 20 external pull-up/down resistors, reducing BOM count, board area, and risk of signal integrity degradation from stubs. |
| Low-inductance power delivery | 4 VCC and 8 GND pins placed symmetrically minimize ground bounce and supply rail collapse during simultaneous 20-bit output switching. |
| JEDEC-compliant voltage ranges | Valid operation per JESD8-5 (2.3–2.7 V) and JESD8B/JESD36 (2.7–3.6 V) ensures interoperability with industry-standard logic families. |
| ESD robustness | HBM >2000 V and CDM >1000 V meet industrial handling requirements without additional protection circuitry. |
Applications
| Industrial Backplane Interface | Memory Address Latching |
|---|---|
|
Use Scenario: Isolating CPU address/data buses from modular I/O cards in PLC chassis with hot-swap capability. IC Role / Device Role / Timing Role: Dual 10-bit register latches address bits during bus arbitration; 3-state outputs prevent contention during card insertion/removal. Use Value: Bus-hold maintains valid address state during brief disconnection, avoiding spurious memory accesses or controller lockup. |
Use Scenario: Capturing 20-bit memory address from a microcontroller before enabling DRAM row/column decoding. IC Role / Device Role / Timing Role: Synchronizes asynchronous address transitions to memory controller clock domain using positive-edge triggered registers. Use Value: 0.2 ns setup time at 3.3 V allows reliable latching even with marginal address skew, improving system boot reliability. |
| Legacy Parallel Peripheral Interface | High-Speed Test Equipment Bus Buffer |
|
Use Scenario: Interfacing FPGA-based test pattern generators to 20-bit DUT control buses operating at 100+ MHz. IC Role / Device Role / Timing Role: Provides level translation between 1.8 V FPGA I/O and 3.3 V peripheral logic while isolating drive loads. Use Value: ±24 mA drive at 3.0 V ensures full-swing signals into 50 Ω scope probes or logic analyzers without signal degradation. |
Use Scenario: Buffering and latching stimulus data between ATE controller and multi-channel DUT interface boards. IC Role / Device Role / Timing Role: Dual-section architecture allows independent clocking of stimulus and response capture paths for precise timing alignment. Use Value: 4.5 ns max tpd enables sub-5 ns timing resolution in automated test sequences, meeting Class B ATE accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit bus-interface register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVTH16821DGGR | TI part with identical pinout and function but higher ICC (max 100 mA vs 40 µA quiescent); no bus-hold circuitry. | Requires external pull resistors on all 20 inputs; less suitable for floating-bus environments like hot-swap backplanes. | Select when interfacing with TI-optimized toolchains or where bus-hold is unnecessary and higher drive (±32 mA) is needed. |
| 74LVC16374APAG | ON Semiconductor 16-bit version (not 20-bit); lacks bus-hold; max fmax = 170 MHz at 3.3 V. | Insufficient bit width for 20-bit address/data paths; requires two devices plus glue logic for full functionality. | Consider only if 16-bit width suffices and cost-per-bit is prioritized over integration and timing performance. |
Compared with SN74ALVTH16821DGGR and 74LVC16374APAG, the 74ALVCH16821DL,518 uniquely combines 20-bit width, integrated bus-hold, 350 MHz speed, and ultra-low quiescent current-making it optimal for space-constrained, noise-sensitive industrial bus interfaces where reliability under undefined input conditions is mandatory.
Availability
74ALVCH16821DL,518 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address latching, legacy parallel peripheral interfacing, and high-speed test equipment bus buffering requiring stable component supply across extended temperature ranges.
Supply support for 74ALVCH16821DL,518 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74ALVCH series targets low-voltage, high-speed bus interface applications demanding robust noise immunity, wide supply tolerance, and minimal external components-designed specifically for industrial control, communications infrastructure, and test instrumentation.
FAQ
What is the minimum recommended supply voltage for guaranteed operation?
The 74ALVCH16821DL,518 is specified for operation down to 1.2 V per JEDEC JESD8-1A, with full functionality-including 24 mA drive, 350 MHz max frequency, and bus-hold-verified at 1.2 V. Below 1.2 V, timing and drive parameters degrade non-linearly and are not characterized.
Can both register sections share the same clock signal?
Yes-1CP (pin 56) and 2CP (pin 29) may be tied together externally to synchronize both 10-bit sections. However, independent clocking is supported and often used to stagger data capture or isolate timing domains; no internal coupling exists between the clock paths.
How does bus-hold behave during power-up or brown-out conditions?
Bus-hold remains functional as long as VCC ≥ 0.8 V, holding inputs at their last valid logic state. Below 0.8 V, bus-hold disables gracefully; inputs float but do not oscillate due to hysteresis design. No external reset sequencing is required for deterministic startup.
Is the TSSOP56 package RoHS-compliant and lead-free?
Yes-the 74ALVCH16821DL,518 in SOT364-1 (TSSOP56) packaging meets RoHS Directive 2011/65/EU and is fully lead-free, with matte tin termination and halogen-free molding compound per Nexperia's standard compliance documentation.
74ALVCH16821DL,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74ALVCH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 10
- Clock Frequency:
- 350 MHz
- Max Propagation Delay @ V, Max CL:
- 4.5ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2.3V ~ 2.7V, 3V ~ 3.6V
- Current - Quiescent (Iq):
- 40 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
74ALVCH16821DL,518 FAQ
1.How can I place an order for 74ALVCH16821DL,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALVCH16821DL,518 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 74ALVCH16821DL,518 reliable?
The price and inventory of 74ALVCH16821DL,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH16821DL,518 is usually 5 days.
3.What payment methods are accepted for 74ALVCH16821DL,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH16821DL,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ALVCH16821DL,518?
74ALVCH16821DL,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALVCH16821DL,518 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 74ALVCH16821DL,518?
For technical support, including 74ALVCH16821DL,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH16821DL,518 requirements.
6.How does Aetrix verify that 74ALVCH16821DL,518 is sourced from the original manufacturer or authorized distributors?
All 74ALVCH16821DL,518 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 74ALVCH16821DL,518 meets industry standards.
7.What is the process for return or replacement of 74ALVCH16821DL,518?
All 74ALVCH16821DL,518 units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH16821DL,518, 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 74ALVCH16821DL,518 part is unused and in its original packaging.
Return procedure for 74ALVCH16821DL,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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