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Texas Instruments SN74BCT29823NT
- Part No.:
- SN74BCT29823NT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74BCT29823NT.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Inventory:1,305
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Product details
Overview
SN74BCT29823NT from Texas Instruments is a 9-bit bus-interface D-type flip-flop with 3-state outputs, noninverting data inputs, clock-enable and asynchronous clear control, rated for 5 V operation (4.5–5.5 V), 125 MHz max clock frequency, and 48 mA output drive capability. It is designed for driving high-capacitance bus lines in I/O port and working register applications.
For engineers reviewing the SN74BCT29823NT datasheet, SN74BCT29823NT pinout, SN74BCT29823NT application, or SN74BCT29823NT equivalent, key selection considerations include its 9-bit edge-triggered storage, independent OE/CLKEN/CLR control logic, BiCMOS low-ICCZ quiescent current, and NT-packaged 24-pin PDIP footprint for through-hole prototyping and legacy industrial systems.
Technical Context
This device implements nine independent D-type flip-flops with positive-edge clock triggering, where CLKEN gates the clock path to enable synchronous latching or hold mode. The buffered OE input controls all nine outputs simultaneously into high-impedance without affecting internal state retention or clock/data sampling.
CLR operates asynchronously to force all Q outputs low regardless of clock or enable states. The BiCMOS process delivers rail-to-rail output swing, 7 pF typical output capacitance, and 2–12 ns output enable/disable propagation delays under 50 pF load - enabling direct bus driving without external pull-ups or interface buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard TTL/5 V logic systems and noise margin compliance. |
| Max Clock Frequency | 125 MHz - supports high-speed data latching in bus arbitration and register file timing paths. |
| Output Drive | 48 mA sink / −24 mA source - directly drives terminated or unterminated PCB traces and backplanes without buffer stages. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - enables sub-10 ns setup/hold timing margins in synchronous 100+ MHz designs. |
| Quiescent Current | ICCZ ≤ 6 mA - reduces standby power in multi-device bus interfaces during idle cycles. |
| Input Clamp Current | −18 mA - protects against transient overvoltage on D, CLK, or control inputs per MIL-STD-883C. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and computing equipment environments. |
Pinout & Package
The SN74BCT29823NT is supplied in a 24-pin plastic dual in-line package (PDIP), NT suffix, with 300-mil body width and through-hole mounting. Pin 1 is top-left corner, with notch or dot marking orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9 | Data Inputs (1D–9D) | Noninverting D inputs for each of nine flip-flops; sampled on CLK↑ when CLKEN = L. |
| 11 | Asynchronous Clear (CLR) | Active-low signal forcing all Q outputs low immediately, independent of clock or enable. |
| 13 | Output Enable (OE) | Active-low control placing all nine Q outputs in high-impedance state without affecting internal latch state. |
| 14 | Clock Enable (CLKEN) | Active-low gate controlling clock path; when high, clocks are blocked and outputs hold last value. |
| 15–23 | Outputs (1Q–9Q) | 3-state buffered noninverting Q outputs; driven low/high or tri-stated based on OE and flip-flop state. |
| 10, 12, 24 | GND, VCC, CLK | Ground reference (Pin 10), +5 V supply (Pin 24), and global clock input (Pin 12). |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process Technology | Combines bipolar speed and CMOS low ICCZ, reducing quiescent supply current to ≤6 mA while maintaining 125 MHz operation. |
| Independent Control Logic | Dedicated OE, CLKEN, and CLR inputs allow simultaneous bus isolation, clock gating, and system reset without shared timing constraints. |
| Direct Bus Driving Capability | 48 mA sink strength and 7 pF Co enable connection to >50 pF bus loads without external termination or level-shifting components. |
| ESD Robustness | Exceeds 2000 V HBM and 200 V machine model - suitable for handling in non-ESD-controlled manufacturing and repair environments. |
Applications
| Industrial I/O Expansion | Legacy System Bus Buffering |
|---|---|
Use Scenario: Adding parallel digital I/O to PLC modules using ISA or proprietary backplane buses with high trace capacitance. IC Role / Device Role / Timing Role: 9-bit bidirectional data register with independent OE and CLR, providing isolated input sampling and output latching synchronized to system clock. Use Value: Eliminates need for discrete transceivers or pull-up networks; supports hot-insertion via OE-controlled high-Z state during card swap. | Use Scenario: Interfacing 8-bit microprocessor address/data buses to peripheral ASICs requiring wider register width and timing isolation. IC Role / Device Role / Timing Role: Synchronous 9-bit latch acting as address latch or data pipeline stage with programmable clock enable and asynchronous reset. Use Value: Enables deterministic timing alignment across multiple data lanes using single CLK/CLKEN pair; CLR allows global register initialization without software overhead. |
| Test Equipment Data Capture | Avionics Maintenance Interface |
Use Scenario: Capturing parallel sensor outputs (e.g., 9-channel ADC or discrete status bits) in automated test fixtures with precise timestamping. IC Role / Device Role / Timing Role: Edge-triggered D flip-flop array capturing parallel inputs on rising CLK edge, with CLKEN used to freeze capture window. Use Value: Guarantees atomic snapshot of all 9 signals within ≤10 ns skew; high drive strength ensures reliable capture across long fixture cables. | Use Scenario: Implementing maintenance port registers in airborne line-replaceable units (LRUs) requiring ESD-hardened, through-hole mounted logic. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding boot-mode or diagnostic settings, retained via OE-controlled high-Z isolation during power cycling. Use Value: NT-package mechanical robustness and 2000 V HBM ESD rating meet DO-160 Section 22 lightning-induced transient requirements for ground support equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit bus-interface flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT29823N | TTL-compatible ACT family; 4.5–5.5 V supply, but lower ICCZ (≤2 mA) and higher speed (tPLH ≤ 6.5 ns), no BiCMOS optimization for bus drive. | Lacks integrated 48 mA drive; requires external buffers for >30 pF loads; better suited for low-power logic glue than direct bus loading. | Select when minimizing static power dominates over bus drive capability and board space is constrained. |
| 74F29823PC | Fast TTL family; 4.5–5.5 V, 100 MHz max clock, 20 mA output drive, higher ICC (35 mA typical), no CLKEN function - only OE and CLR. | No clock gating; all flip-flops always clocked - unsuitable for gated register files or power-gated subsystems. | Choose only for drop-in replacement in legacy F-series designs where CLKEN is unused and drive demand is ≤20 mA. |
Compared with SN74ACT29823N and 74F29823PC, the SN74BCT29823NT uniquely combines BiCMOS bus drive, clock-enable gating, and PDIP packaging - making it irreplaceable for through-hole, high-capacitance, and power-aware industrial register applications where layout change is not feasible.
Availability
SN74BCT29823NT is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy system bus buffering, test equipment data capture, and avionics maintenance interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT29823NT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT29823NT belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically for high-speed, high-drive bus interface applications where TTL compatibility, low quiescent current, and robust ESD performance are required.
FAQ
What is the maximum clock frequency supported by the SN74BCT29823NT?
The SN74BCT29823NT supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification is validated with CL = 50 pF load and accounts for worst-case tPLH/tPHL propagation delays up to 10 ns. At elevated temperatures or reduced supply voltage, the usable frequency may decrease due to increased delay variation.
Does the SN74BCT29823NT support asynchronous reset, and how does it interact with other controls?
Yes, the SN74BCT29823NT features an asynchronous active-low CLR input (Pin 11) that forces all nine Q outputs low immediately, regardless of CLK, CLKEN, or OE states. This override behavior is fully independent - it functions even when OE is active (outputs in high-Z) or CLKEN is high (clock disabled), ensuring deterministic system-level reset capability.
Can the SN74BCT29823NT drive a 100-pF bus load reliably?
No - the SN74BCT29823NT is characterized for CL = 50 pF in switching specifications, with tPZH/tPZL up to 12 ns and output drive rated at 48 mA sink under that condition. Driving 100 pF would increase rise/fall times and propagation delay beyond guaranteed limits, potentially violating setup/hold timing. For >50 pF loads, external buffering or series termination is recommended.
What is the purpose of the CLKEN pin on the SN74BCT29823NT, and how does it differ from OE?
The CLKEN pin (Pin 14) gates the internal clock path to each flip-flop: when high, it blocks CLK transitions and holds Q outputs at their last latched value; when low, it enables normal edge-triggered operation. Unlike OE - which only disables output drivers - CLKEN preserves internal state and allows new D inputs to be sampled only when enabled, making it essential for gated clock domains and power-managed register files.
Is the SN74BCT29823NT still in production, and what is its lifecycle status?
The SN74BCT29823NT is marked OBSOLETE by Texas Instruments per official packaging addendum (11-Apr-2013). It is no longer in active production, though limited legacy stock may be available. Aetrix Electronics provides traceable, tested inventory with full documentation and supports long-term design continuity through obsolescence mitigation planning and cross-reference guidance for the SN74BCT29823NT.
SN74BCT29823NT 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:
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- Input Type:
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- Output Type:
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- Current - Output High, Low:
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- Voltage - Supply:
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- Operating Temperature:
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SN74BCT29823NT FAQ
1.How can I place an order for SN74BCT29823NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29823NT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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For technical support, including SN74BCT29823NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29823NT requirements.
6.How does Aetrix verify that SN74BCT29823NT is sourced from the original manufacturer or authorized distributors?
All SN74BCT29823NT 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 SN74BCT29823NT meets industry standards.
7.What is the process for return or replacement of SN74BCT29823NT?
All SN74BCT29823NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29823NT, 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 SN74BCT29823NT part is unused and in its original packaging.
Return procedure for SN74BCT29823NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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