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

Texas Instruments SN74ALVCH16823DLR

Name: SN74ALVCH16823DLR
Brand: Texas Instruments
SKU: SN74ALVCH16823DLR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALVCH16823DLR

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74ALVCH16823DLR.pdf

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

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Product details

Overview

SN74ALVCH16823DLR 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 supports dual 9-bit or single 18-bit configuration, features clock-enable and asynchronous clear inputs, and delivers ±24 mA output drive at 3 V. It is used in high-speed I/O port buffering, bidirectional bus driving with parity, and working register applications in industrial and embedded systems.

For engineers reviewing the SN74ALVCH16823DLR datasheet, SN74ALVCH16823DLR pinout, SN74ALVCH16823DLR application, or SN74ALVCH16823DLR equivalent, key selection criteria include its 56-pin SSOP (DL) package, bus-hold on all data inputs, 150 MHz max clock frequency, and guaranteed –40°C to 85°C operation across supply voltages from 1.65 V to 3.6 V.

Technical Context

This device implements two independent 9-bit positive-edge-triggered D-type flip-flops, each with dedicated clock-enable (CLKEN), clear (CLR), and output-enable (OE) controls. The OE input places outputs in high-impedance state without affecting internal latch operation, enabling concurrent data retention or update during bus isolation.

It uses TI's EPIC™ submicron CMOS process and integrates bus-hold circuitry on all data inputs-eliminating external pullup/pulldown resistors-and meets JESD 17 latch-up immunity (>250 mA) and MIL-STD-883 ESD ratings (>2000 V HBM).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - Enables interoperability across 1.8-V, 2.5-V, and 3.3-V logic domains without level shifters.
Max Clock Frequency	150 MHz - Supports high-throughput data latching in wide parallel interfaces such as memory buffers and FPGA I/O expansion.
Output Drive	±24 mA at V_CC = 3 V - Sufficient to drive heavily loaded PCB traces or multiple CMOS inputs without signal degradation.
Propagation Delay (t_pd)	3.5 ns typical at V_CC = 3.3 V - Ensures tight timing margins in synchronous bus architectures with sub-5 ns critical paths.
Bus-Hold Current	±75 µA at V_CC = 3 V - Actively maintains valid logic levels on floating or unterminated data lines, reducing system-level noise susceptibility.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade deployment in factory automation, test equipment, and network infrastructure.
I/O Capacitance	6.5 pF (data inputs), 7 pF (outputs) - Minimizes capacitive loading on driving sources and improves signal integrity in high-speed routing.

Pinout & Package

SN74ALVCH16823DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP), designated DL, with 0.65 mm lead pitch and 13.9 mm × 7.5 mm body dimensions per JEDEC MO-194. The package is RoHS-compliant, NIPDAU lead-finished, and rated MSL Level-1 (260°C peak reflow).

Pin/Terminal	Circuit Role	Design Meaning
1CLR, 2CLR	Asynchronous clear (active-low)	Forces corresponding 9-bit Q outputs low independently of clock; enables hardware reset without timing dependency.
1OE, 2OE	Output enable (active-low)	Places respective 9-bit output groups into high-impedance state; allows shared bus arbitration and hot-swap isolation.
1CLKEN, 2CLKEN	Clock enable (active-low)	Disables clock buffer path when high, freezing Q outputs while preserving D-input sampling capability.
1CLK, 2CLK	Positive-edge clock inputs	Triggers data capture on rising edge; supports independent or synchronized operation of two 9-bit sections.
1D1–1D9, 2D1–2D9	Data inputs	Each has integrated bus-hold; eliminates need for external biasing on unused or intermittently driven lines.
1Q1–1Q9, 2Q1–2Q9	3-state outputs	Driven high/low or tri-stated under OE control; designed for direct connection to capacitive or low-impedance bus loads.
V_CC, GND	Power and ground terminals	Multiple distributed V_CC/GND pairs (8 total) minimize switching noise and improve power integrity across 18-bit switching events.

Key Features

Feature	Design Value
Wide V_CC range (1.65 V to 3.6 V)	Enables drop-in use across legacy 2.5-V and modern 1.8-V/3.3-V systems without voltage translation.
Integrated bus-hold on all data inputs	Removes requirement for 10-kΩ external pullup/down resistors, saving board space and BOM cost.
Dual independent 9-bit sections	Supports flexible partitioning-e.g., one section for address latching, another for data strobing-in compact 56-pin footprint.
High-impedance output control via OE	Permits non-disruptive data updates or retention while outputs are isolated-critical for glitch-free bus handoff.
–40°C to +85°C industrial temperature rating	Validated performance over full range ensures reliability in uncontrolled ambient environments like factory floors.

Applications

Industrial I/O Expansion	FPGA-to-ASIC Interface Buffering
Use Scenario: Expanding GPIO count on PLC controller modules using parallel backplane interconnects. IC Role / Device Role / Timing Role: Acts as 18-bit bidirectional latched interface between microcontroller and field I/O cards, synchronizing data on clock edges with configurable enable/disable. Use Value: Eliminates need for discrete level shifters and pull resistors while maintaining timing integrity up to 150 MHz across 1.8-V/3.3-V domain boundaries.	Use Scenario: Isolating and latching high-speed configuration data between FPGA configuration engine and ASIC boot ROM. IC Role / Device Role / Timing Role: Provides metastability-hardened, clock-domain-crossing register stage with independent OE control for safe read/write arbitration. Use Value: Bus-hold prevents floating states during partial reconfiguration; 3.5 ns t_pd ensures setup/hold compliance in <10 ns clock cycles.
Memory-Mapped Peripheral Interface	Test Equipment Data Capture Register
Use Scenario: Interfacing microprocessor address/data bus to legacy parallel EEPROM or SRAM devices with strict timing windows. IC Role / Device Role / Timing Role: Functions as 18-bit transparent latch and driver, decoupling processor timing from slower peripheral access cycles. Use Value: ±24 mA drive strength sustains signal integrity across 10 cm PCB traces; 1.65 V minimum V_CC supports low-power sleep modes.	Use Scenario: Capturing parallel sensor output streams (e.g., 16-bit ADC + 2 status bits) in automated test fixtures. IC Role / Device Role / Timing Role: Serves as synchronized acquisition register, triggered by test sequencer clock with simultaneous CLR for known initial state. Use Value: Asynchronous CLR guarantees deterministic startup; 150 MHz clock support matches high-speed digitizer sampling rates.

Industrial I/O Expansion

FPGA-to-ASIC Interface Buffering

Use Scenario: Expanding GPIO count on PLC controller modules using parallel backplane interconnects.

IC Role / Device Role / Timing Role: Acts as 18-bit bidirectional latched interface between microcontroller and field I/O cards, synchronizing data on clock edges with configurable enable/disable.

Use Value: Eliminates need for discrete level shifters and pull resistors while maintaining timing integrity up to 150 MHz across 1.8-V/3.3-V domain boundaries.

Use Scenario: Isolating and latching high-speed configuration data between FPGA configuration engine and ASIC boot ROM.

IC Role / Device Role / Timing Role: Provides metastability-hardened, clock-domain-crossing register stage with independent OE control for safe read/write arbitration.

Use Value: Bus-hold prevents floating states during partial reconfiguration; 3.5 ns t_pd ensures setup/hold compliance in <10 ns clock cycles.

Memory-Mapped Peripheral Interface

Test Equipment Data Capture Register

Use Scenario: Interfacing microprocessor address/data bus to legacy parallel EEPROM or SRAM devices with strict timing windows.

IC Role / Device Role / Timing Role: Functions as 18-bit transparent latch and driver, decoupling processor timing from slower peripheral access cycles.

Use Value: ±24 mA drive strength sustains signal integrity across 10 cm PCB traces; 1.65 V minimum V_CC supports low-power sleep modes.

Use Scenario: Capturing parallel sensor output streams (e.g., 16-bit ADC + 2 status bits) in automated test fixtures.

IC Role / Device Role / Timing Role: Serves as synchronized acquisition register, triggered by test sequencer clock with simultaneous CLR for known initial state.

Use Value: Asynchronous CLR guarantees deterministic startup; 150 MHz clock support matches high-speed digitizer sampling rates.

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
SN74ALVCH16827DLR	Same 56-pin DL package but configured as 20-bit universal bus transceiver (A/B direction control instead of dual CLK/OE).	Better suited for bidirectional data flow (e.g., memory data bus), not unidirectional latching with independent clock domains.	Select SN74ALVCH16827DLR only when direction-controlled data transfer-not clocked register storage-is required.
SN74LVC16373ADLR	16-bit latch (not flip-flop); transparent mode when LE high, latched when LE low; no clock-enable or asynchronous clear.	Lacks edge-triggered behavior and independent section control-unsuitable for synchronous pipeline stages or reset-critical registers.	Choose SN74LVC16373ADLR for simple level-sensitive latching where clock edge timing and hardware reset are unnecessary.

Compared with SN74ALVCH16823DLR, SN74ALVCH16827DLR provides bidirectional data flow but sacrifices independent clock-domain control, while SN74LVC16373ADLR offers lower propagation delay (2.5 ns) but lacks asynchronous reset and clock-enable-making it unsuitable for systems requiring deterministic initialization or gated clocking.

Availability

SN74ALVCH16823DLR is available at Aetrix Electronics and suitable for industrial I/O expansion, FPGA interface buffering, and memory-mapped peripheral interfacing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74ALVCH16823DLR 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 IC design.

The SN74ALVCH16823DLR belongs to TI's Widebus™ family of advanced bus-interface logic, engineered specifically for robust, low-voltage, high-speed parallel data transfer in industrial, communications, and computing infrastructure.

FAQ

What is the function of the CLKEN input on the SN74ALVCH16823DLR?

The CLKEN (clock enable) input on the SN74ALVCH16823DLR is an active-low control that disables the internal clock buffer when high, preventing new data from being latched while retaining the current Q-output state. When CLKEN is low, the device operates normally, capturing D-input data on the rising edge of CLK. This feature allows precise gating of clock distribution without adding external logic, and is implemented separately for each 9-bit section (1CLKEN and 2CLKEN) in the SN74ALVCH16823DLR.

Does the SN74ALVCH16823DLR require external pullup or pulldown resistors on its data inputs?

No, the SN74ALVCH16823DLR does not require external pullup or pulldown resistors on its data inputs because it integrates active bus-hold circuitry on all 18 D-input pins. This circuitry maintains a valid logic level (high or low) on floating or unterminated inputs using ±75 µA hold current at 3 V, eliminating risk of undefined states and reducing BOM count. This functionality is inherent to the SN74ALVCH16823DLR design and requires no external components or configuration.

What is the maximum clock frequency supported by the SN74ALVCH16823DLR across its full voltage range?

The SN74ALVCH16823DLR supports a maximum clock frequency of 150 MHz across its entire recommended operating range (1.65 V to 3.6 V), as specified in the timing requirements table. At 3.3 V, characterization shows f_max reaches 250 MHz, though this higher value is not production-tested and is not guaranteed. For reliable, production-validated operation, engineers should design to the 150 MHz limit stated in the SN74ALVCH16823DLR datasheet under all V_CC conditions.

How does the OE (output enable) function interact with internal flip-flop operation in the SN74ALVCH16823DLR?

In the SN74ALVCH16823DLR, the OE (output enable) input operates independently of internal flip-flop timing-asserting OE (low) places the corresponding 9-bit Q outputs in high-impedance state without halting clocking, data capture, or latch retention. This means new D-input data can be sampled and stored on subsequent clock edges while outputs remain isolated, enabling seamless bus arbitration and glitch-free transitions. This decoupled behavior is a core architectural feature of the SN74ALVCH16823DLR.

What package type and lead finish does the SN74ALVCH16823DLR use, and is it RoHS-compliant?

The SN74ALVCH16823DLR uses a 56-pin Shrink Small-Outline Package (SSOP), designated DL, with 0.65 mm lead pitch and JEDEC MO-194 compliance. It features NIPDAU (nickel-palladium-gold) lead finish and is fully RoHS-compliant (lead-free). The device carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for peak reflow temperatures up to 260°C, making it compatible with standard lead-free assembly processes. This package specification applies exclusively to the SN74ALVCH16823DLR variant.

SN74ALVCH16823DLR 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:: 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

SN74ALVCH16823DLR FAQ

1.How can I place an order for SN74ALVCH16823DLR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVCH16823DLR 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 SN74ALVCH16823DLR reliable?

The price and inventory of SN74ALVCH16823DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16823DLR is usually 5 days.

3.What payment methods are accepted for SN74ALVCH16823DLR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH16823DLR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALVCH16823DLR?

SN74ALVCH16823DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVCH16823DLR 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 SN74ALVCH16823DLR?

For technical support, including SN74ALVCH16823DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16823DLR requirements.

6.How does Aetrix verify that SN74ALVCH16823DLR is sourced from the original manufacturer or authorized distributors?

All SN74ALVCH16823DLR 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 SN74ALVCH16823DLR meets industry standards.

7.What is the process for return or replacement of SN74ALVCH16823DLR?

All SN74ALVCH16823DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16823DLR, 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 SN74ALVCH16823DLR part is unused and in its original packaging.

Return procedure for SN74ALVCH16823DLR:

1.Submit a request within 90 days.

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

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