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Texas Instruments SN74BCT29854DW
- Part No.:
- SN74BCT29854DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT29854DW.pdf
- Description:
- IC TRANSCEIVER 1-9BIT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,964
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Product details
Overview
SN74BCT29854DW from Texas Instruments is an 8-bit to 9-bit BiCMOS bus transceiver with integrated parity generator/checker, TTL-compatible inputs/outputs, open-collector ERR flag, and latch-enable/clear control. It operates from 4.5 V to 5.5 V at 0°C–70°C, supports bidirectional A↔B data transfer with parity validation, and is used in legacy industrial backplane and asynchronous bus diagnostic systems.
For engineers reviewing the SN74BCT29854DW datasheet, SN74BCT29854DW pinout, SN74BCT29854DW application, or SN74BCT29854DW equivalent, key selection considerations include its flow-through pinout, inverted-parity diagnostic mode, ERR flag latching behavior, and SOIC-24 package compatibility with legacy 300-mil DIP footprints.
Technical Context
The SN74BCT29854DW implements a dual-function parity-aware transceiver: it generates odd parity during A→B transmission and checks parity (including forced-inverted parity for diagnostics) during B→A transmission. Its BiCMOS process delivers TTL-level drive strength (−24 mA/48 mA) with reduced standby current versus standard bipolar designs.
Control logic includes independent OEA/OEB enables, LE-driven error-flag latching, and active-low CLR that asynchronously resets the ERR latch. The ERR output is open-collector, allowing wired-OR fault-bus implementation, and PARITY is actively driven as a 9th-bit output during A→B transfer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with 5 V TTL/CMOS systems and margin against supply droop. |
| Propagation Delay | 1 ns to 8 ns - Enables high-speed bus handshaking in sub-10 ns timing-critical backplane interfaces. |
| Output Drive | −24 mA (IOH), 48 mA (IOL) - Sustains robust TTL fan-out (≥10) under loaded bus conditions. |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade industrial control and instrumentation environments. |
| Parity Logic | Odd parity generation & checking - Provides deterministic single-bit error detection on 8-bit data paths. |
| ERR Output Type | Open-collector - Allows multi-device fault-bus wiring without external logic or pull-ups. |
| Package | SOIC-24 (DW) - Surface-mount footprint compatible with automated assembly and legacy 300-mil DIP layouts. |
Pinout & Package
SN74BCT29854DW uses a 24-pin SOIC (DW) package with 300-mil width, JEDEC MS-013 compliant, moisture sensitivity level 1, and NiPdAu lead finish. Pin 1 is top-left corner (OEA), with flow-through layout: all A-side inputs (A1–A8, OEA, CLR, LE) on left side; all B-side I/Os (B1–B8, PARITY, OEB, ERR) on right side; GND (pin 12) and VCC (pin 13) centrally located.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Output Enable A | Active-low control enabling A→B data transfer and parity generation; disables A outputs when high. |
| A1–A8 | Data Inputs A | 8-bit parallel input bus from source system; sampled when OEA low and OEB high. |
| CLR | Clear Input | Asynchronous active-low reset of ERR latch; forces ERR high regardless of parity state. |
| LE | Latch Enable | Active-high edge-triggered capture of ERR state into internal register for diagnostic hold. |
| GND | Ground Reference | Signal and power return path; pin 12 provides low-inductance reference for BiCMOS switching. |
| VCC | Supply Voltage | +5 V power rail; pin 13 placement minimizes supply loop inductance between adjacent GND/VCC pair. |
| OEB | Output Enable B | Active-low control enabling B→A data transfer and parity checking; disables B outputs when high. |
| B1–B8 | Data I/O B | 8-bit bidirectional bus port; drives data to A side when OEB low, receives data from A when OEB high. |
| PARITY | Parity Output | 9th-bit odd-parity signal generated during A→B transfer; monitored during B→A parity check. |
| ERR | Error Flag Output | Open-collector output asserting low on parity mismatch; latched/stored/cleared via LE/CLR. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Separates A-side inputs and B-side I/Os across package width, simplifying PCB routing and reducing crosstalk in dense backplane layouts. |
| Inverted-parity diagnostic mode | When both OEA and OEB are low, forces parity error to validate system error-handling logic without actual bit corruption. |
| ERR latch with LE/CLR | Enables persistent fault capture across clock domain boundaries or during transient bus activity, supporting post-mortem diagnostics. |
| TTL-compatible BiCMOS process | Delivers bipolar-level drive strength with CMOS-like standby current reduction, extending thermal margin in high-density boards. |
| Functionally equivalent to Am29854 | Direct second-source option for AMD-based legacy systems, preserving firmware, layout, and test infrastructure. |
Applications
| Industrial Backplane Bus | Legacy Computer Memory Expansion |
|---|---|
Use Scenario: Asynchronous data transfer between CPU and peripheral cards in modular PLC chassis with parity-checked address/data lines. IC Role / Device Role / Timing Role: Bidirectional 8-bit transceiver with real-time parity generation (A→B) and checking (B→A), ERR flag signaling bus integrity failure. Use Value: Detects single-bit errors on hot-swappable I/O modules without requiring host CPU intervention or additional error-correction logic. | Use Scenario: Interfacing memory controller to expansion RAM banks in 1980s–1990s minicomputers where parity was mandatory per JEDEC standards. IC Role / Device Role / Timing Role: Generates odd parity during write cycles and validates parity on read cycles, with ERR flag routed to NMI interrupt line. Use Value: Maintains strict JEDEC-compliant memory subsystem reliability using only one IC per 8-bit data lane, eliminating discrete XOR networks. |
| Telecom Line Card Diagnostics | Test Equipment Data Path Validation |
Use Scenario: Embedded diagnostics in T1/E1 line interface units verifying framing alignment and payload integrity across multiple DS0 channels. IC Role / Device Role / Timing Role: Parity checker for time-slot multiplexed data streams; inverted-parity mode injects controlled faults for self-test verification. Use Value: Confirms end-to-end fault-detection chain (from SERDES through buffer to processor) without external pattern generators. | Use Scenario: Automated test fixture validating signal integrity and timing margins on prototype PCBs with parallel data buses. IC Role / Device Role / Timing Role: Reference transceiver generating known-good parity patterns while monitoring ERR response under varying VCC/load conditions. Use Value: Quantifies setup/hold timing margins and noise immunity by measuring ERR assertion latency across temperature/voltage corners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parity transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT29854NT | Dual-in-line package (300-mil DIP), same electrical specs and pinout as DW variant; through-hole mounting. | Used where legacy through-hole assembly or socket-based prototyping is required; no surface-mount rework needed. | Select SN74BCT29854NT for manual assembly, breadboarding, or field-replaceable modules with DIP sockets. |
| Am29854PC | AMD-manufactured functional equivalent; identical logic, timing, and pinout; minor differences in ICCZ (45 mA vs 45 mA typical) and VOL (0.5 V max). | Drop-in replacement in AMD-designed systems; requires verification of RoHS compliance and MSL rating for new production. | Select Am29854PC only if sourcing from authorized AMD channels and legacy board documentation specifies AMD part numbers. |
Compared with SN74BCT29854NT and Am29854PC, the SN74BCT29854DW offers SOIC-24 surface-mount compatibility for automated manufacturing, identical core functionality, and TI's long-term commercial temperature support-making it optimal for new industrial PCB designs requiring volume assembly and lifecycle stability.
Availability
SN74BCT29854DW is available at Aetrix Electronics and suitable for industrial backplane bus interfaces, legacy computer memory expansion, telecom line card diagnostics, and test equipment data path validation requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT29854DW 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT29854DW belongs to TI's legacy BCT logic family, designed specifically for high-speed, parity-protected asynchronous bus interfacing in commercial-temperature industrial control and computing systems.
FAQ
What is the primary function of the SN74BCT29854DW in a data bus system?
The SN74BCT29854DW serves as an 8-bit bidirectional bus transceiver with integrated odd-parity generation and checking. During A→B transmission, it appends a parity bit; during B→A transmission, it validates that parity. Its ERR output signals mismatches, and the latch-enable (LE) and clear (CLR) inputs allow diagnostic capture and reset of error states-making the SN74BCT29854DW essential for fault-tolerant industrial backplane communication.
Does the SN74BCT29854DW support both 5 V TTL and CMOS logic levels?
Yes, the SN74BCT29854DW features TTL-compatible inputs and outputs, with VIH = 2 V minimum and VIL = 0.8 V maximum, ensuring reliable interfacing with standard 5 V TTL devices. Its BiCMOS output stage delivers −24 mA high-level and 48 mA low-level drive, matching TTL fan-out requirements. While not optimized for CMOS voltage thresholds, it operates correctly across the full 4.5 V–5.5 V VCC range required by mixed-logic systems containing the SN74BCT29854DW.
How does the inverted-parity mode work on the SN74BCT29854DW?
The SN74BCT29854DW enters inverted-parity mode when both OEA and OEB are low-forcing a deliberate parity error regardless of input data. This feature allows system designers to verify error-handling firmware, interrupt routing, and ERR flag propagation without inducing actual data corruption. The mode is documented in the function table and is a unique diagnostic capability of the SN74BCT29854DW not found in basic transceivers.
Can the ERR output of the SN74BCT29854DW be directly connected to multiple devices on a shared fault bus?
Yes, the ERR output of the SN74BCT29854DW is open-collector, enabling direct wired-OR connection with other open-collector ERR outputs on the same fault bus. A single pull-up resistor suffices for the entire bus, and any device asserting low will pull the line low-allowing centralized fault monitoring. This behavior is electrically specified in the datasheet and is a core design feature of the SN74BCT29854DW for multi-module systems.
Is the SN74BCT29854DW pin-compatible with the Am29854 from AMD?
Yes, the SN74BCT29854DW is functionally and pin-compatible with the AMD Am29854, including identical pin assignments, logic behavior, timing parameters, and DC specifications. TI explicitly states functional equivalence in the datasheet, and both parts share the same 24-pin layout (A1–A8, B1–B8, OEA, OEB, LE, CLR, PARITY, ERR, GND, VCC). This makes the SN74BCT29854DW a validated second-source replacement for Am29854-based designs.
SN74BCT29854DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- 8-Bit to 9-Bit Parity Bus Transceiver
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74BCT29854DW FAQ
1.How can I place an order for SN74BCT29854DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29854DW 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 SN74BCT29854DW reliable?
The price and inventory of SN74BCT29854DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT29854DW is usually 5 days.
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SN74BCT29854DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT29854DW 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 SN74BCT29854DW?
For technical support, including SN74BCT29854DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29854DW requirements.
6.How does Aetrix verify that SN74BCT29854DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT29854DW 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 SN74BCT29854DW meets industry standards.
7.What is the process for return or replacement of SN74BCT29854DW?
All SN74BCT29854DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29854DW, 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 SN74BCT29854DW part is unused and in its original packaging.
Return procedure for SN74BCT29854DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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