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Texas Instruments 74AC16823DL
- Part No.:
- 74AC16823DL
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74AC16823DL.pdf
- Description:
- BUS DRIVER, AC SERIES, 9-BIT6
- Quantity:
- Payment:
- Shipping:
Inventory:787
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Product details
Overview
74AC16823DL from Texas Instruments is an 18-bit 3-state D-type flip-flop IC designed for high-capacitance bus driving and parity/data path expansion in wide-bus systems. It operates from −40°C to 85°C, supports 115 MHz clock frequency at 5 V, delivers ±24 mA output drive, and features independent clock-enable and clear controls per 9-bit section.
For engineers reviewing the 74AC16823DL datasheet, 74AC16823DL pinout, 74AC16823DL application, or 74AC16823DL equivalent, key selection criteria include dual 9-bit configurable operation, flow-through pinout for PCB layout optimization, distributed VCC/GND for noise suppression, EPIC™ 1-µm CMOS process, and 500-mA latch-up immunity at 125°C.
Technical Context
The 74AC16823DL implements two independent 9-bit D-type flip-flop sections, each with dedicated CLK, CLKEN, CLR, and OE inputs. Clock-enable logic disables the clock buffer when high, latching outputs without affecting data retention.
Its flow-through architecture places inputs on one side and outputs on the opposite side of the 56-pin DL package, minimizing trace crossovers. Distributed VCC and GND pins across the package reduce simultaneous switching noise during high-speed toggling of all 18 outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), compatible with TTL input thresholds and 5-V supply |
| Function | Dual 9-bit or single 18-bit edge-triggered D-type flip-flop with 3-state outputs |
| Max Clock Frequency | 115 MHz at VCC = 5 V - enables high-speed register buffering in data-path applications |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive 50-pF loads with <13 ns propagation delay |
| Propagation Delay (tPLH/tPHL) | 3.1–12.0 ns (CLK to Q) at VCC = 5 V - ensures tight timing margins in synchronous bus interfaces |
| Supply Range | 3 V to 5.5 V - supports mixed-voltage system integration and legacy 5-V designs |
| Latch-Up Immunity | 500 mA typical at 125°C - meets stringent reliability requirements for industrial temperature operation |
Pinout & Package
74AC16823DL is housed in a 56-pin plastic shrink small-outline package (SSOP-DL), 300-mil body width, 25-mil pin pitch, JEDEC MO-118 compliant, with gull-wing leads and 0.050-inch lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear (active-low) | Resets corresponding 9-bit section's Q outputs to low independently of clock or CLKEN state |
| 1OE, 2OE | Output enable (active-low) | Places respective 9-bit outputs in high-impedance state without affecting internal flip-flop operation |
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Transfers D-input data to Q outputs on low-to-high transition when CLKEN is low |
| 1CLKEN, 2CLKEN | Clock enable (active-low) | Disables clock path when high, freezing Q outputs while allowing new D-data entry |
| 1D1–1D9, 2D1–2D9 | Data inputs | Parallel 9-bit data inputs per section; support independent loading into each 9-bit register |
| 1Q1–1Q9, 2Q1–2Q9 | 3-state outputs | Corresponding registered outputs; tri-stated when OE is high, driven otherwise |
| VCC (Pins 7, 22, 35, 46) | Power supply | Four distributed VCC pins minimize IR drop and supply noise across the 18-bit output bank |
| GND (Pins 4, 11, 18, 27, 32, 39, 44, 53) | Ground reference | Eight GND pins provide low-inductance return paths and reduce ground bounce during simultaneous switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual 9-bit configuration | Enables flexible partitioning: use as two independent registers or one 18-bit register via shared control signals |
| Flow-through pinout | Input pins on left side, outputs on right side - eliminates layer jumps and reduces signal crosstalk in dense PCB layouts |
| Distributed power/ground | 4 VCC and 8 GND pins suppress simultaneous switching noise, critical for stable 115-MHz operation |
| EPIC™ 1-µm CMOS process | Delivers high speed with low static current (8 µA typical ICC) and robust latch-up immunity (500 mA @ 125°C) |
| Independent CLKEN per section | Allows selective clock gating of either 9-bit block without disturbing the other, enabling power-aware register control |
Applications
| Memory Interface Buffering | Parity Bus Expansion |
|---|---|
|
Use Scenario: Buffering address/data lines between microprocessor and SRAM/DRAM banks with parity checking. IC Role / Device Role / Timing Role: 18-bit registered transceiver providing setup/hold margin extension and bus isolation during memory cycles. Use Value: Enables reliable 115-MHz data transfer with ±24 mA drive into 50-pF loads, reducing timing closure risk in wide-memory buses. |
Use Scenario: Expanding 8-bit data bus to 9-bit with parity generation and latching in industrial PLC backplanes. IC Role / Device Role / Timing Role: Dual 9-bit register holding even/odd parity bits alongside data, synchronized to system clock with independent clear. Use Value: Supports real-time parity validation using dedicated CLR and OE controls-no external glue logic required. |
| I/O Port Expansion | High-Capacitance Bus Driver |
|
Use Scenario: Adding 18-bit parallel I/O capability to microcontroller-based test equipment with isolated control lines. IC Role / Device Role / Timing Role: Configurable as two 9-bit ports with separate clock-enable and output-enable for independent peripheral interfacing. Use Value: Eliminates need for discrete buffers; 3-state outputs allow bidirectional sharing of test bus lines under software control. |
Use Scenario: Driving long, unterminated backplane traces (>10 cm) in telecom line cards with >100 pF total load capacitance. IC Role / Device Role / Timing Role: High-current 3-state driver delivering 24 mA per output to overcome capacitive loading and maintain signal integrity. Use Value: Maintains <12 ns propagation delay despite heavy loading-critical for deterministic timing in packet-forwarding hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit registered buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16823DL | Higher drive (±24 mA vs ±24 mA same, but ACT has faster tPLH/tPHL: 2.8 ns typ at 5 V), TTL-compatible inputs | Better suited for systems requiring tighter timing margins or interfacing directly with legacy TTL logic | Select when interfacing with 5-V TTL families or needing sub-3 ns propagation at full speed |
| SN74ALVCH16823GR | Lower voltage (1.65–3.6 V), higher density (32-pin TVSOP), no CLKEN per section - uses global clock enable | Targeted at portable/embedded systems with space constraints and lower-power budgets, not industrial 5-V buses | Choose only for 3.3-V or mixed-voltage designs where board area is critical and per-section clock gating is unnecessary |
Compared with 74AC16823DL, the 74ACT16823DL offers marginally faster timing and TTL input compatibility, while the SN74ALVCH16823GR trades voltage flexibility and compactness for loss of independent clock-enable control and reduced noise immunity - making 74AC16823DL optimal for robust 5-V industrial bus buffering.
Availability
74AC16823DL is available at Aetrix Electronics and suitable for memory interface buffering, parity bus expansion, I/O port expansion, and high-capacitance bus driving requiring stable component supply across industrial temperature ranges.
Supply support for 74AC16823DL 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 founded in 1930, specializing in analog, embedded processing, logic, and interface solutions for industrial, automotive, and communications markets.
The 74AC16823DL belongs to TI's Widebus™ family of high-speed, wide-bus interface ICs, engineered specifically for expanding data/address paths and implementing robust, noise-immune register buffers in demanding industrial and computing systems.
FAQ
What is the operating temperature range for the 74AC16823DL?
The 74AC16823DL is characterized for operation from −40°C to +85°C. This industrial temperature range ensures reliable performance in factory automation controllers, test equipment, and telecom infrastructure where ambient conditions exceed commercial limits. The device maintains full AC and DC specifications across this range without derating.
Does the 74AC16823DL support independent clock enable for each 9-bit section?
Yes, the 74AC16823DL provides dedicated 1CLKEN and 2CLKEN inputs - one per 9-bit section. When either CLKEN is high, its associated clock buffer is disabled, freezing the Q outputs while allowing continued D-input updates. This enables selective register gating without affecting the other section's operation.
Can the 74AC16823DL be used in 3.3-V systems?
Yes, the 74AC16823DL supports VCC from 3 V to 5.5 V. At 3.3 V, it delivers 60 MHz maximum clock frequency and maintains valid logic thresholds (VIH = 2.1 V, VIL = 0.9 V), making it interoperable with 3.3-V microcontrollers and FPGAs - though output drive strength is reduced versus 5-V operation.
How does the flow-through pinout of the 74AC16823DL improve PCB layout?
The 74AC16823DL places all inputs (D, CLK, CLKEN, CLR, OE) on the left side and all outputs (Q) on the right side of the DL package. This flow-through arrangement allows straight trace routing from controller to IC to load, eliminating vias and layer changes - reducing crosstalk, impedance discontinuities, and layout time in high-density bus designs.
What is the latch-up immunity specification for the 74AC16823DL?
The 74AC16823DL provides 500-mA typical latch-up immunity at 125°C, verified per JEDEC JESD78. This robustness stems from TI's EPIC™ implanted CMOS process and ensures sustained operation in electrically noisy industrial environments where transient overcurrent events may occur on VCC or I/O lines.
74AC16823DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74AC16823DL FAQ
1.How can I place an order for 74AC16823DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16823DL 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 74AC16823DL reliable?
The price and inventory of 74AC16823DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16823DL is usually 5 days.
3.What payment methods are accepted for 74AC16823DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16823DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC16823DL?
74AC16823DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16823DL 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 74AC16823DL?
For technical support, including 74AC16823DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16823DL requirements.
6.How does Aetrix verify that 74AC16823DL is sourced from the original manufacturer or authorized distributors?
All 74AC16823DL 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 74AC16823DL meets industry standards.
7.What is the process for return or replacement of 74AC16823DL?
All 74AC16823DL units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16823DL, 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 74AC16823DL part is unused and in its original packaging.
Return procedure for 74AC16823DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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