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Texas Instruments 74AC16823DLR
- Part No.:
- 74AC16823DLR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74AC16823DLR.pdf
- Description:
- BUS DRIVER, AC SERIES, 9-BIT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
74AC16823DLR from Texas Instruments is an 18-bit 3-state D-type flip-flop IC designed for high-capacitance bus driving and wide-data-path buffering. It operates across −40°C to 85°C, supports 3 V to 5.5 V supply, delivers ±24 mA output drive at 5 V, and achieves up to 115 MHz clock frequency. It is used in parity bus interfacing, I/O port expansion, and working register implementation.
For engineers reviewing the 74AC16823DLR datasheet, 74AC16823DLR pinout, 74AC16823DLR application, or 74AC16823DLR equivalent, key selection criteria include dual 9-bit configurable operation, independent clock-enable and clear control per section, 3-state output enable timing (tPZH = 2.2 ns typ), and SSOP-56 package compatibility with high-density PCB layouts.
Technical Context
This device 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 internal state retention.
It uses TI's EPIC 1-µm CMOS process, features distributed VCC/GND pins to suppress switching noise, and employs flow-through pin architecture to simplify PCB trace routing. The 3-state outputs support bus-hold-free bidirectional data flow with no impact on internal latch operation during high-impedance mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), compatible with TTL input thresholds |
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing |
| Max Clock Frequency | 115 MHz at VCC = 5 V - enables high-speed synchronous data capture |
| Output Drive | ±24 mA at VCC = 5 V - drives 50-pF loads with controlled edge rates |
| Propagation Delay | tPLH/tPHL = 3.1–12.7 ns at VCC = 5 V - ensures tight timing margin in 100+ MHz buses |
| Input/Output Capacitance | Ci = 3 pF, Co = 11 pF - minimizes loading on upstream drivers and downstream nets |
| Operating Temperature | −40°C to +85°C - qualified for commercial and industrial ambient environments |
Pinout & Package
Packaged in a 56-pin shrink small-outline package (SSOP-DL), 300-mil body width, 25-mil pin pitch, JEDEC MO-118 compliant, with gull-wing leads and exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active-low) | Resets corresponding 9-bit section Q outputs to low regardless of clock state |
| 1OE, 2OE | Output enable input (active-low) | Places all 9 outputs of respective section into high-impedance state without altering internal latch data |
| 1CLK, 2CLK | Clock input | Triggers data capture on rising edge when CLKEN is low |
| 1CLKEN, 2CLKEN | Clock enable input | Disables clock path when high, freezing output state while allowing new D-inputs to be loaded |
| 1D1–1D9, 2D1–2D9 | Data inputs | Parallel 9-bit data lanes per section; sampled on CLK↑ when CLKEN = L |
| 1Q1–1Q9, 2Q1–2Q9 | 3-state outputs | Corresponding registered outputs; high-Z when OE = H, driven otherwise |
| VCC (pins 7, 22, 35, 46, 50) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve power integrity |
| GND (pins 4, 11, 18, 29, 32, 41, 49) | Ground | Seven GND pins provide low-inductance return paths for high-speed switching currents |
Key Features
| Feature | Design Value |
|---|---|
| Dual 9-bit configurable operation | Supports either one 18-bit register or two independent 9-bit registers via separate control inputs |
| Flow-through pin architecture | Input and output pins aligned on opposite sides to minimize layer transitions and crosstalk in dense PCB layouts |
| Distributed power/ground pinning | Five VCC and seven GND pins suppress ground bounce and improve signal integrity at >100 MHz operation |
| Independent clock-enable per section | Enables selective latching of one 9-bit block while the other continues sampling - critical for staggered bus handshaking |
| High noise immunity | 500-mA latch-up immunity at 125°C ensures robustness in electrically noisy industrial environments |
Applications
| Parity Bus Interface | I/O Port Expansion |
|---|---|
Use Scenario: Adding 9-bit parity generation/correction logic between memory controller and DRAM subsystem. IC Role / Device Role / Timing Role: Captures address/data bits synchronously, holds parity result until error-check cycle completes. Use Value: Enables full-width parity validation without adding propagation delay beyond 12.7 ns, preserving memory access timing budgets. |
Use Scenario: Expanding microcontroller GPIO count for industrial PLC backplane communication. IC Role / Device Role / Timing Role: Buffers and isolates 18-bit parallel control/status lines between MCU and field I/O modules. Use Value: ±24 mA drive strength sustains signal integrity over 15-cm ribbon cables; 3-state OE allows shared bus arbitration. |
| Working Register Bank | Wide Address Buffering |
Use Scenario: Storing intermediate computation results in FPGA co-processor interface logic. IC Role / Device Role / Timing Role: Acts as double-buffered register file with independent CLKEN per section for ping-pong data staging. Use Value: Dual-section architecture eliminates external multiplexing; tPHL = 3.9 ns enables sub-10 ns pipeline stages. |
Use Scenario: Driving 18-bit address lines from a 32-bit CPU to legacy memory-mapped peripherals. IC Role / Device Role / Timing Role: Level-shifts and strengthens address signals while providing bus isolation during DMA cycles. Use Value: Flow-through pinout reduces trace length by >40% vs. zig-zag packages, cutting interconnect delay and EMI radiation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit 3-state D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC16374DGGR | Same AC logic family, 32-pin TSSOP, dual 8-bit (16-bit total), no CLKEN per section | Lacks per-section clock enable; requires external gating for independent section control | Preferred when board space is constrained and dual 8-bit operation suffices |
| 74ACT16823DLR | TTL-compatible inputs (VIH = 2 V min), identical pinout and function, higher ICC | Better interoperability with legacy 5-V TTL systems but consumes ~2× more quiescent current | Select when interfacing with mixed AC/ACT logic or legacy TTL buses requiring guaranteed VIH margin |
Compared with SN74AC16374DGGR, the 74AC16823DLR provides true dual 9-bit independence and finer-grained clock control; versus 74ACT16823DLR, it offers lower power and better noise immunity at the cost of reduced TTL input compatibility.
Availability
74AC16823DLR is available at Aetrix Electronics and suitable for parity bus interfacing, I/O port expansion, and working register applications requiring stable component supply despite its obsolete status - supported via verified legacy channel sourcing and extended lifecycle inventory.
Supply support for 74AC16823DLR 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, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74AC16823DLR belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for wide-data-path buffering, parity handling, and I/O expansion in high-density digital systems.
FAQ
What is the operating voltage range for the 74AC16823DLR?
The 74AC16823DLR operates from 3 V to 5.5 V DC. Its input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), ensuring reliable logic-level compatibility across this range. At 3 V, it supports 60 MHz maximum clock frequency; at 5 V, it reaches 115 MHz - verified per SCAS243A timing tables.
Does the 74AC16823DLR support independent control of its two 9-bit sections?
Yes, the 74AC16823DLR provides fully independent control: each 9-bit section has dedicated CLK, CLKEN, CLR, and OE inputs. This allows one section to latch data while the other remains transparent, enabling ping-pong buffering and asynchronous handshaking - confirmed by the FUNCTION TABLE and logic diagram in the datasheet.
What package type is used for the 74AC16823DLR?
The 74AC16823DLR uses a 56-pin shrink small-outline package (SSOP-DL) with 25-mil pin pitch and 300-mil body width, compliant with JEDEC MO-118. Mechanical drawing MSSO001C defines dimensions including 0.010-inch lead thickness and 0.020–0.040-inch seating plane variation - critical for automated optical inspection and reflow profiling.
How does the clock-enable (CLKEN) function work on the 74AC16823DLR?
When CLKEN is high, the clock buffer is disabled, holding the Q outputs at their last latched value regardless of CLK transitions. When CLKEN is low, data at D inputs transfers to Q on the next rising CLK edge. This behavior is explicitly defined in the FUNCTION TABLE and verified in timing parameters tsu(CLKEN low) = 4.2 ns at 5 V.
Is the 74AC16823DLR still in active production?
No - TI lists 74AC16823DLR as OBSOLETE in its packaging addendum. However, Aetrix Electronics maintains verified legacy inventory with full traceability, supporting ongoing production for industrial and aerospace programs where redesign is impractical or cost-prohibitive.
74AC16823DLR 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:
- -
74AC16823DLR FAQ
1.How can I place an order for 74AC16823DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16823DLR 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 74AC16823DLR reliable?
The price and inventory of 74AC16823DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16823DLR is usually 5 days.
3.What payment methods are accepted for 74AC16823DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16823DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC16823DLR?
74AC16823DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16823DLR 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 74AC16823DLR?
For technical support, including 74AC16823DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16823DLR requirements.
6.How does Aetrix verify that 74AC16823DLR is sourced from the original manufacturer or authorized distributors?
All 74AC16823DLR 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 74AC16823DLR meets industry standards.
7.What is the process for return or replacement of 74AC16823DLR?
All 74AC16823DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16823DLR, 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 74AC16823DLR part is unused and in its original packaging.
Return procedure for 74AC16823DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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