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Texas Instruments SN74BCT29823DW
- Part No.:
- SN74BCT29823DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74BCT29823DW.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Inventory:161
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Product details
Overview
SN74BCT29823DW from Texas Instruments is a 9-bit edge-triggered D-type bus-interface flip-flop with 3-state outputs, noninverting data inputs, clock-enable (CLKEN), asynchronous clear (CLR), and buffered output-enable (OE). It operates at 5 V, supports up to 125 MHz clock frequency, drives capacitive bus loads directly, and is rated for 0°C to 70°C operation.
For engineers reviewing the SN74BCT29823DW datasheet, SN74BCT29823DW pinout, SN74BCT29823DW application, or SN74BCT29823DW equivalent, key selection considerations include its 9-bit synchronous latching capability, high-current 3-state drive (±48 mA IOL/IOH), BiCMOS low-ICCZ quiescent current, and compatibility with TTL-level control signals in legacy bus interface designs.
Technical Context
This device implements nine independent D-type flip-flops sharing common CLK, CLKEN, CLR, and OE controls. Clocking is positive-edge triggered with CLKEN gating the clock buffer; asserting CLR forces all Q outputs low asynchronously. OE places outputs in high-impedance without affecting internal state retention or clock/data sampling.
The BiCMOS process enables 3.2 V VOH at −24 mA load while maintaining ICCZ ≤ 6 mA at VCC = 5.5 V - significantly lower than equivalent bipolar TTL devices. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive strength are fully compatible with standard TTL logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | 9-bit edge-triggered D-type flip-flop with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems |
| Max Clock Frequency | 125 MHz - supports high-speed bus buffering in backplane and I/O applications |
| Output Drive | IOL = 48 mA / IOH = −24 mA - directly drives heavy capacitive bus lines without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 12 ns - ensures timing margin in 125 MHz synchronous interfaces |
| Quiescent Current | ICCZ ≤ 6 mA at VCC = 5.5 V - reduces system power in idle or high-impedance states |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and computing environments |
Pinout & Package
SN74BCT29823DW is housed in a 24-pin SOIC (DW) package with 300-mil width and standard pin pitch. The package is surface-mount, RoHS-compliant (Pb-Free per TI eco plan), and moisture-sensitive level not specified per official TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low output-enable controlling all nine Q outputs' high-impedance state |
| 2–10 | 1D–9D | Noninverting data inputs for each of nine D-type flip-flops |
| 11 | CLR | Asynchronous active-low clear resetting all Q outputs to logic low |
| 12 | GND | Ground reference for logic and power return path |
| 13 | VCC | Positive supply input (4.5–5.5 V) |
| 14–22 | 1Q–9Q | Noninverting registered outputs corresponding to 1D–9D |
| 23 | CLKEN | Active-low clock-enable disabling clock propagation to flip-flop inputs |
| 24 | CLK | Positive-edge-triggered clock input shared across all nine flip-flops |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to ≤6 mA while maintaining TTL-compatible output drive and speed |
| Asynchronous CLR | Forces all nine Q outputs low independently of clock or CLKEN state |
| Buffered OE input | Enables high-impedance outputs without disrupting internal register state or data capture |
| 9-bit bus interface capability | Supports direct connection to data/address buses without pull-up resistors or interface logic |
| TTL-compatible input thresholds | VIH = 2 V and VIL = 0.8 V ensure reliable interfacing with legacy 5 V TTL sources |
Applications
| Backplane Data Bus Buffering | I/O Port Expansion |
|---|---|
Use Scenario: Isolating and driving wide parallel data paths between CPU and peripheral cards in industrial backplanes. IC Role / Device Role / Timing Role: 9-bit synchronous latch and 3-state bus driver managing data flow direction and timing alignment. Use Value: Eliminates need for discrete buffers or pull-ups; 48 mA sink current handles typical backplane capacitance up to 100 pF per line. | Use Scenario: Expanding microcontroller GPIO count to support multiple parallel peripherals like LCDs, keypads, and ADCs. IC Role / Device Role / Timing Role: Registered I/O port with edge-triggered capture and tri-state output control for bidirectional data transfer. Use Value: Enables clean read-modify-write cycles via OE-controlled bus release; CLR allows hardware reset of port state. |
| Bidirectional Bus Transceiver with Parity | Working Register File |
Use Scenario: Implementing parity-checked data transfers between two processors sharing a common bus segment. IC Role / Device Role / Timing Role: 9-bit latch providing synchronized data staging and controlled bus access via CLKEN and OE. Use Value: CLKEN allows deterministic latching window; OE enables safe bus arbitration without glitches during parity generation. | Use Scenario: Storing intermediate computation results in real-time control systems requiring deterministic register access. IC Role / Device Role / Timing Role: Edge-triggered working register holding 9-bit status or configuration data with asynchronous reset. Use Value: CLR provides immediate register initialization on fault recovery; 125 MHz clock supports tight control loop timing. |
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 |
|---|---|---|---|
| SN74ACT273DW | 8-bit (not 9-bit), no CLKEN, single global CLR, same SOIC-20 package | Lacks clock enable and one bit; unsuitable for 9-bit bus widths or gated clock domains | Select only if 8-bit width suffices and clock gating is unnecessary |
| SN74LS273N | Bipolar TTL process, higher ICCZ (≈60 mA), slower max frequency (30 MHz), PDIP-20 package | Lower drive (IOL = 24 mA), incompatible with high-speed or low-power designs | Consider only for legacy board replacements where BiCMOS advantages are not required |
Compared with SN74ACT273DW and SN74LS273N, the SN74BCT29823DW uniquely delivers 9-bit width, clock-enable control, BiCMOS efficiency, and 125 MHz operation - making it the only option among the three for high-performance, pin-compatible 9-bit bus latching in modernized 5 V systems.
Availability
SN74BCT29823DW is available at Aetrix Electronics and suitable for backplane bus buffering, I/O port expansion, bidirectional transceiver implementation, and working register applications requiring stable component supply despite its obsolete status.
Supply support for SN74BCT29823DW 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 SN74BCT29823DW belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, designed specifically for high-speed, low-power 5 V bus interface applications requiring robust drive strength and TTL compatibility.
FAQ
What is the function of the CLKEN pin on the SN74BCT29823DW?
The CLKEN (clock-enable) pin on the SN74BCT29823DW is an active-low input that gates the clock signal path to the internal D-type flip-flops. When CLKEN is low, the device responds to rising edges on CLK; when CLKEN is high, the clock buffer is disabled and outputs retain their last latched state. This enables precise control over data capture windows without altering the clock signal itself - a key feature distinguishing the SN74BCT29823DW from simpler latches.
Does the SN74BCT29823DW support hot insertion or live bus swapping?
The SN74BCT29823DW does not include explicit hot-swap protection circuitry, but its absolute maximum ratings allow VO = −0.5 V to 5.5 V on disabled outputs and its high-impedance state (activated by OE) isolates the outputs from the bus. When OE is asserted before power-up or during removal, the SN74BCT29823DW can be safely inserted or removed in live-bus systems - provided external design measures (e.g., series resistors, slew-rate limiting) are implemented per system-level requirements.
What is the minimum pulse width required for the CLR signal on the SN74BCT29823DW?
The minimum pulse width for the CLR signal on the SN74BCT29823DW is 6 ns at VCC = 5 V and TA = 25°C, as specified in the timing requirements table. This short assertion time allows fast, reliable asynchronous reset of all nine Q outputs to logic low, independent of clock or CLKEN state - a critical capability for fault recovery in real-time control systems using the SN74BCT29823DW.
Can the SN74BCT29823DW operate reliably at 3.3 V supply voltage?
No, the SN74BCT29823DW is not characterized or guaranteed for operation at 3.3 V. Its recommended operating conditions specify VCC = 4.5 V to 5.5 V, and electrical characteristics (e.g., VOH ≥ 2.4 V at −15 mA) assume 4.5–5.5 V supply. Attempting to run the SN74BCT29823DW at 3.3 V may result in insufficient noise margin, marginal output drive, or functional failure - use a 5 V supply or select a 3.3 V–compatible alternative for such designs.
How does the BiCMOS process benefit the SN74BCT29823DW compared to standard TTL versions?
The BiCMOS process used in the SN74BCT29823DW reduces ICCZ (quiescent supply current) to ≤6 mA - roughly one-tenth that of equivalent bipolar TTL devices like the SN74LS273. This lowers static power consumption significantly while retaining full TTL-compatible output drive (48 mA sink), input thresholds, and speed. As a result, the SN74BCT29823DW delivers superior power efficiency without sacrificing interoperability in legacy 5 V systems.
SN74BCT29823DW 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:
- -
SN74BCT29823DW FAQ
1.How can I place an order for SN74BCT29823DW through Aetrix?
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6.How does Aetrix verify that SN74BCT29823DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT29823DW 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 SN74BCT29823DW meets industry standards.
7.What is the process for return or replacement of SN74BCT29823DW?
All SN74BCT29823DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29823DW, 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 SN74BCT29823DW part is unused and in its original packaging.
Return procedure for SN74BCT29823DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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