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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74ALVCH16823DL

Name: SN74ALVCH16823DL
Brand: Texas Instruments
SKU: SN74ALVCH16823DL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALVCH16823DL

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 56-BSSOP (0.295", 7.50mm Width)

Datasheet:: SN74ALVCH16823DL.pdf

Description:: IC FF D-TYPE DUAL 9BIT 56SSOP

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Product details

Overview

SN74ALVCH16823DL from Texas Instruments is an 18-bit bus-interface D-type flip-flop with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It functions as two independent 9-bit registers or one 18-bit register, features bus-hold on all data inputs, and supports clock-enable and asynchronous clear for precise timing control in high-density digital systems.

For engineers reviewing the SN74ALVCH16823DL datasheet, SN74ALVCH16823DL pinout, SN74ALVCH16823DL application, or SN74ALVCH16823DL equivalent, this device is critical for synchronous data latching in memory interfaces, I/O expansion, and bidirectional bus buffering where low-voltage compatibility, high drive strength, and bus-hold immunity are required.

Technical Context

The SN74ALVCH16823DL implements dual 9-bit positive-edge-triggered D-type flip-flops with independent clock-enable (CLKEN), clear (CLR), and output-enable (OE) controls per section. Its EPIC™ submicron CMOS process enables fast propagation delays (t_pd ≤ 4.5 ns at V_CC = 3.3 V) and robust noise immunity across –40°C to 85°C.

Each section supports 3-state outputs with ±24 mA drive capability at 3 V, bus-hold circuitry eliminating external pullup/pulldown resistors, and independent OE control that isolates outputs without affecting internal latch state-enabling hot-swap and dynamic bus arbitration.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - Enables interoperability with 1.8-V, 2.5-V, and 3.3-V logic families in mixed-supply systems.
Max Clock Frequency	150 MHz - Supports high-speed synchronous data capture in memory buffers and interface registers.
t_pd (Propagation Delay)	≤ 4.5 ns at V_CC = 3.3 V - Ensures tight timing margins in high-frequency bus applications.
I_OL/I_OH	±24 mA at V_CC = 3 V - Drives heavily loaded or capacitive buses without external buffers.
Bus-Hold Current	±75 µA at V_CC = 3 V - Maintains valid logic levels on floating inputs, removing need for external biasing.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded and communications equipment.
Package	56-pin SSOP (DL) - Surface-mount package with 0.65 mm pitch, compatible with standard reflow profiles (MSL Level-1).

Pinout & Package

SN74ALVCH16823DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 13.9 mm × 7.5 mm footprint, 1.2 mm max height, JEDEC MO-194 compliant. Pin 1 located at top-left corner with index area marking.

Pin/Terminal	Circuit Role	Design Meaning
1CLR, 2CLR	Asynchronous Clear Input	Active-low reset forcing Q outputs low regardless of clock; enables system-level initialization.
1OE, 2OE	Output Enable Input	Active-low control placing respective 9-bit output group into high-impedance state; no effect on internal latch state.
1CLKEN, 2CLKEN	Clock Enable Input	Active-low gate enabling clock propagation to D-to-Q path; high disables clock, freezing output state.
1CLK, 2CLK	Clock Input	Positive-edge-triggered sampling of D inputs; synchronized with CLKEN and CLR for deterministic timing.
1D1–1D9, 2D1–2D9	Data Inputs	9-bit parallel input per section; each includes bus-hold circuitry to retain last valid logic level when floating.
1Q1–1Q9, 2Q1–2Q9	3-State Outputs	9-bit buffered outputs per section; driven high/low or placed in high-Z via OE; support bidirectional bus sharing.
V_CC, GND	Power Supply	Dual V_CC and GND pins per section (pins 7, 22, 35, 50) reduce switching noise and improve power integrity.

Key Features

Feature	Design Value
Wide V_CC Range (1.65 V–3.6 V)	Supports direct interfacing with 1.8-V microcontrollers, 2.5-V FPGAs, and 3.3-V peripherals without level shifters.
Bus-Hold Circuitry	Eliminates external pullup/pulldown resistors on all 18 data inputs, reducing BOM count and PCB area.
Independent Section Control	Separate CLKEN, CLR, and OE per 9-bit section enables flexible partitioning-e.g., one section latched while other updates.
High-Drive 3-State Outputs	±24 mA drive at 3 V allows direct connection to 50-Ω transmission lines or multi-load buses without buffer amplification.
Low Propagation Delay	t_pd ≤ 4.5 ns ensures minimal clock-to-output skew in time-critical register files and pipeline stages.

Applications

Memory Interface Buffering	Industrial I/O Expansion
Use Scenario: Latching address/data between a microcontroller and external SRAM or flash memory operating at different voltage domains. IC Role / Device Role / Timing Role: 18-bit synchronous register providing setup/hold margin compliance and voltage translation via wide V_CC range. Use Value: Eliminates timing violations during memory read/write cycles and removes need for discrete level translators.	Use Scenario: Expanding GPIO count on PLC modules using parallel bus architecture with shared data lines. IC Role / Device Role / Timing Role: Bidirectional 18-bit bus transceiver with independent OE control enabling half-duplex communication over common traces. Use Value: Reduces interconnect complexity and supports hot-plug detection via bus-hold retention during configuration changes.
Communications Backplane Register	FPGA Configuration Interface
Use Scenario: Synchronizing control signals across multiple line cards in telecom backplanes with strict skew requirements. IC Role / Device Role / Timing Role: Low-skew 18-bit flip-flop used as a timing-aligned register bank for clock-domain crossing. Use Value: Achieves <0.5 ns output skew (t_sk(o)) ensuring simultaneous signal assertion across distributed subsystems.	Use Scenario: Holding configuration bitstream from SPI flash before loading into Xilinx or Intel FPGA configuration pins. IC Role / Device Role / Timing Role: Parallel data latch buffering high-speed serial-to-parallel conversion, decoupling flash access latency from FPGA startup. Use Value: Prevents metastability during FPGA configuration by providing clean, edge-aligned parallel data with bus-hold safety.

Memory Interface Buffering

Industrial I/O Expansion

Use Scenario: Latching address/data between a microcontroller and external SRAM or flash memory operating at different voltage domains.

IC Role / Device Role / Timing Role: 18-bit synchronous register providing setup/hold margin compliance and voltage translation via wide V_CC range.

Use Value: Eliminates timing violations during memory read/write cycles and removes need for discrete level translators.

Use Scenario: Expanding GPIO count on PLC modules using parallel bus architecture with shared data lines.

IC Role / Device Role / Timing Role: Bidirectional 18-bit bus transceiver with independent OE control enabling half-duplex communication over common traces.

Use Value: Reduces interconnect complexity and supports hot-plug detection via bus-hold retention during configuration changes.

Communications Backplane Register

FPGA Configuration Interface

Use Scenario: Synchronizing control signals across multiple line cards in telecom backplanes with strict skew requirements.

IC Role / Device Role / Timing Role: Low-skew 18-bit flip-flop used as a timing-aligned register bank for clock-domain crossing.

Use Value: Achieves <0.5 ns output skew (t_sk(o)) ensuring simultaneous signal assertion across distributed subsystems.

Use Scenario: Holding configuration bitstream from SPI flash before loading into Xilinx or Intel FPGA configuration pins.

IC Role / Device Role / Timing Role: Parallel data latch buffering high-speed serial-to-parallel conversion, decoupling flash access latency from FPGA startup.

Use Value: Prevents metastability during FPGA configuration by providing clean, edge-aligned parallel data with bus-hold safety.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit bus-interface flip-flop applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ALVCH16823DGGR	TSSOP-56 package (DGG); 2000-unit tape-and-reel vs. DL's 20-unit tube; identical electrical specs and pinout.	Better suited for automated SMT assembly; same thermal impedance (θ_JA = 81°C/W) but slightly smaller footprint (12.5 mm × 6.1 mm).	Select DGGR for high-volume production requiring pick-and-place compatibility and tighter reel logistics.
SN74LVCH16823DL	LV family: lower V_CC range (1.65 V–3.3 V); reduced drive (±12 mA at 3 V); higher t_pd (≤ 6.5 ns); same pinout and bus-hold.	Optimized for ultra-low-power systems where 3.6-V tolerance and 24-mA drive are unnecessary; lower static current (ICC = 10 µA typical).	Select LVCH16823DL when power budget is constrained and full ALVC drive/stress margin is not required.

Compared with SN74ALVCH16823DL, the DGGR offers identical functionality in a more automation-friendly package, while the LVCH16823DL trades drive strength and voltage headroom for lower quiescent power-making SN74ALVCH16823DL optimal for mixed-voltage industrial interfaces demanding robustness and timing precision.

Availability

SN74ALVCH16823DL is available at Aetrix Electronics and suitable for industrial I/O expansion, memory interface buffering, and FPGA configuration applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74ALVCH16823DL 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 expertise in high-reliability interface ICs and widebus technologies.

The SN74ALVCH16823DL belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, low-voltage digital systems requiring precise timing control, bus-hold stability, and robust 3-state drive in industrial and communications infrastructure.

FAQ

What is the maximum clock frequency supported by the SN74ALVCH16823DL?

The SN74ALVCH16823DL supports a maximum clock frequency of 150 MHz across its full operating temperature and voltage range (–40°C to 85°C, 1.65 V to 3.6 V). This rating is verified under standard test conditions (CL = 30 pF, RL = 500 Ω) and applies to both 9-bit sections independently. At 3.3 V, timing characterization confirms f_max ≥ 250 MHz under optimized load conditions, though 150 MHz is the guaranteed production-tested limit.

Does the SN74ALVCH16823DL require external pullup or pulldown resistors on its data inputs?

No, the SN74ALVCH16823DL does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry on all 18 D-inputs. This feature maintains the last valid logic state when inputs float, with hold currents ranging from ±25 µA to ±75 µA depending on V_CC and input voltage-fully eliminating the need for external biasing components.

Can the SN74ALVCH16823DL operate with a 1.8-V supply?

Yes, the SN74ALVCH16823DL is fully specified to operate at 1.8 V (within its 1.65 V–3.6 V V_CC range). At 1.8 V, it delivers guaranteed t_pd ≤ 5.8 ns, t_su ≥ 1.3 ns, and I_OL/I_OH ≥ ±4 mA, making it suitable for low-voltage microcontroller and FPGA I/O interfaces where power efficiency and signal integrity are critical.

How does the output-enable (OE) function interact with the internal flip-flop state in the SN74ALVCH16823DL?

The OE input in the SN74ALVCH16823DL is purely output-directed and has no effect on internal latch operation. When OE is asserted (low), the corresponding 9-bit output group enters high-impedance mode while the internal Q-state remains unchanged-allowing new data to be clocked into D inputs or retained indefinitely without affecting bus contention. This enables safe hot-swap and dynamic bus arbitration.

What is the thermal performance of the SN74ALVCH16823DL in its SSOP (DL) package?

The SN74ALVCH16823DL in the SSOP-DL package has a junction-to-ambient thermal resistance (θ_JA) of 74°C/W, measured under standard JEDEC conditions (1s² copper pad, no airflow). This value supports continuous operation at full drive (±24 mA per output) up to +85°C ambient when mounted on a 2-layer PCB with adequate copper pour-verified per TI's SCES038F datasheet revision April 2005.

SN74ALVCH16823DL Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ALVCH

Package/Case:: 56-BSSOP (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Active

Function:: Master Reset

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 2

Number of Bits per Element:: 9

Clock Frequency:: 150 MHz

Max Propagation Delay @ V, Max CL:: 4.5ns @ 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:: 4.5 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 56-SSOP

SN74ALVCH16823DL FAQ

1.How can I place an order for SN74ALVCH16823DL through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVCH16823DL 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 SN74ALVCH16823DL reliable?

The price and inventory of SN74ALVCH16823DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16823DL is usually 5 days.

3.What payment methods are accepted for SN74ALVCH16823DL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH16823DL transactions.

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SN74ALVCH16823DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVCH16823DL 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 SN74ALVCH16823DL?

For technical support, including SN74ALVCH16823DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16823DL requirements.

6.How does Aetrix verify that SN74ALVCH16823DL is sourced from the original manufacturer or authorized distributors?

All SN74ALVCH16823DL 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 SN74ALVCH16823DL meets industry standards.

7.What is the process for return or replacement of SN74ALVCH16823DL?

All SN74ALVCH16823DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16823DL, 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 SN74ALVCH16823DL part is unused and in its original packaging.

Return procedure for SN74ALVCH16823DL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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