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Texas Instruments SN74BCT29853DWR
- Part No.:
- SN74BCT29853DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74BCT29853DWR.pdf
- Description:
- BUS TRANSCEIVER
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Product details
Overview
SN74BCT29853DWR 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 and supports bidirectional asynchronous data transfer between A and B buses with real-time parity validation.
For engineers reviewing the SN74BCT29853DWR datasheet, SN74BCT29853DWR pinout, SN74BCT29853DWR application, or SN74BCT29853DWR equivalent, key selection criteria include its flow-through pinout, inverted-parity diagnostic mode, ERR flag latching behavior, and BiCMOS standby current reduction versus legacy TTL bus transceivers.
Technical Context
The SN74BCT29853DWR implements a dual-mode 9-bit parity engine: it generates odd parity during A→B transmission and checks parity (including forced-inverted parity for diagnostics) during B→A transmission. Its ERR output is open-collector and can be sampled, stored via LE, or cleared via CLR - independent of bus direction control.
Control logic decodes OEA/OEB states to enable A→B transfer with parity generation, B→A transfer with parity checking, isolation mode (both enables high), or inverted-parity mode (OEA=OEB=L). The device uses BiCMOS process technology to achieve TTL-level interface compatibility while reducing ICCZ to 30–45 mA versus standard bipolar 29853 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS system rails without level-shifting. |
| Operating Temperature | 0°C to 70°C - specified for commercial-grade embedded and industrial control applications. |
| Propagation Delay | 1 ns to 10 ns - ensures sub-10 ns bus turnaround in high-speed backplane or memory-mapped I/O systems. |
| Output Drive | −24 mA IOH / 48 mA IOL - sufficient to drive multiple TTL loads or terminated transmission lines. |
| ERR Output Type | Open-collector - allows wired-OR fault-bus architectures and direct connection to 3.3 V or 5 V interrupt controllers. |
| Parity Function | Odd parity generation and checking - detects single-bit errors on 8-bit data + 1 parity bit paths. |
| Standby Current | 30–45 mA ICCZ - reduced vs. bipolar equivalents, enabling lower power in idle bus segments. |
Pinout & Package
SN74BCT29853DWR is housed in a 24-pin SOIC (DW) package with 300-mil width and gull-wing leads. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant per TI's Pb-Free (RoHS) eco plan.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Output Enable A | Active-low control enabling A-port drivers; when low, A1–A8 drive B1–B8 (with parity gen). |
| A1–A8 | Data Inputs / Outputs (A side) | Bidirectional I/O ports for A bus; function as inputs when OEA high, outputs when OEA low. |
| ERR | Parity Error Flag | Open-collector output asserting low on parity mismatch; requires external pull-up for logic-high state. |
| CLR | Clear Input | Active-low asynchronous reset of ERR latch; forces ERR output high regardless of parity state. |
| GND | Ground Reference | Primary return path for all internal logic and I/O currents; must be low-impedance for noise immunity. |
| VCC | Power Supply | +5 V supply rail; decoupling capacitor required within 1 cm of pin to suppress switching noise. |
| B1–B8 | Data Inputs / Outputs (B side) | Bidirectional I/O ports for B bus; function as inputs when OEB high, outputs when OEB low. |
| PARITY | Parity Output | 9th-bit output reflecting odd parity of A1–A8; used as input during B→A parity check mode. |
| OEB | Output Enable B | Active-low control enabling B-port drivers; when low, B1–B8 drive A1–A8 (with parity check). |
| LE | Latch Enable | Active-high edge-triggered strobe capturing current ERR state into internal latch for diagnostic hold. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | All inputs (A1–A8, OEA, OEB, LE, CLR) located on left side; all outputs (B1–B8, PARITY, ERR) on right - simplifies PCB routing and reduces crosstalk. |
| Inverted-parity diagnostic mode | When OEA=OEB=L, generated parity is inverted to force ERR assertion - enables hardware-level fault injection for system self-test. |
| ERR flag latching | LE input captures transient parity errors for persistent fault reporting, eliminating need for continuous polling or fast ISR response. |
| BiCMOS process | Combines TTL input thresholds with CMOS-like standby current (ICCZ ≤ 45 mA), reducing thermal load in dense bus interfaces. |
| Functionally equivalent to Am29853 | Direct drop-in replacement for AMD's industry-standard 29853 in legacy designs, preserving timing, pinout, and logic behavior. |
Applications
| Backplane Data Transfer | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Asynchronous data exchange between CPU and peripheral cards across a 24-pin parallel backplane with error detection. IC Role / Device Role / Timing Role: Bidirectional 8-bit transceiver with real-time parity generation/checking and latched error flag for fault logging. Use Value: Enables single-bit error detection without software overhead; ERR latch holds fault state until cleared by host controller. |
Use Scenario: Isolating and validating sensor/actuator data between field-side and controller-side buses in programmable logic controllers. IC Role / Device Role / Timing Role: Parity-aware bus interface IC managing data integrity across galvanically isolated communication links. Use Value: Detects wiring faults or EMI-induced bit flips on noisy factory-floor buses; open-collector ERR integrates directly with PLC interrupt inputs. |
| Legacy System Bus Expansion | Diagnostic Test Equipment |
|
Use Scenario: Extending ISA or VMEbus-based systems with additional memory-mapped peripherals requiring parity-protected data paths. IC Role / Device Role / Timing Role: High-speed TTL-compatible transceiver providing flow-through layout and sub-10 ns propagation for cycle-accurate timing. Use Value: Maintains strict timing compliance with legacy bus protocols while adding hardware-level parity validation previously implemented in FPGA logic. |
Use Scenario: Embedded self-test subsystem in automated test equipment that validates data path integrity before functional testing. IC Role / Device Role / Timing Role: Programmable parity injector/checker using inverted-parity mode (OEA=OEB=L) to force known-error conditions. Use Value: Eliminates need for external pattern generators during production test; ERR latch captures pass/fail status for automated result capture. |
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 |
|---|---|---|---|
| SN74BCT29853NT | Dual-in-line package (PDIP, NT), same electrical specs and pinout; higher thermal resistance and larger footprint. | Suitable for through-hole prototyping or legacy board rework where SOIC reflow is unavailable. | Select SN74BCT29853NT only when manual assembly or socket-based debugging is required. |
| Am29853PC | Identical function and pinout; bipolar process yields higher ICCZ (≈120 mA) and slower tPLH/tPHL (≈15 ns typical). | Compatible in existing Am29853-based designs but increases power and reduces maximum bus frequency. | Choose Am29853PC only if BiCMOS availability is constrained and system thermal budget permits higher standby current. |
Compared with SN74BCT29853NT and Am29853PC, the SN74BCT29853DWR delivers identical functionality in a space-efficient SOIC package with 60% lower standby current and 30% faster propagation - making it optimal for new designs prioritizing density and power efficiency.
Availability
SN74BCT29853DWR is available at Aetrix Electronics and suitable for backplane data transfer, industrial PLC I/O modules, legacy system bus expansion, and diagnostic test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT29853DWR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT29853DWR belongs to TI's BCT-series advanced bus-interface logic family, designed specifically for high-reliability, parity-protected data transfer in commercial-grade computing and control systems.
FAQ
What is the primary function of the SN74BCT29853DWR in a data bus system?
The SN74BCT29853DWR serves as an 8-bit bidirectional bus transceiver with integrated odd-parity generation and checking. During A→B transfer, it appends a parity bit; during B→A transfer, it validates that parity. Its ERR output flags mismatches, and the latch-enable (LE) and clear (CLR) inputs allow controlled capture and reset of error states - making the SN74BCT29853DWR essential for hardware-level data integrity in mission-critical bus architectures.
Does the SN74BCT29853DWR support both 3.3 V and 5 V logic levels?
No, the SN74BCT29853DWR is a 5 V-only device with TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) and operates strictly from 4.5 V to 5.5 V. It does not tolerate 3.3 V supply or I/O voltages. Driving its inputs from 3.3 V sources may cause undefined logic states; level translation is required for mixed-voltage systems using the SN74BCT29853DWR.
How does the inverted-parity mode work on the SN74BCT29853DWR?
When both OEA and OEB are low, the SN74BCT29853DWR enters inverted-parity mode: it generates even parity instead of odd parity during A→B transfer, forcing the ERR output active (low) regardless of data content. This provides a deterministic fault condition for system diagnostics - allowing engineers to verify ERR path integrity, latch behavior, and interrupt handling without injecting actual bit errors. The SN74BCT29853DWR's datasheet explicitly defines this as a design feature for enhanced testability.
Can the ERR output of the SN74BCT29853DWR drive multiple loads directly?
Yes - the ERR output is open-collector and rated for 20 µA leakage at VOH = 2.4 V, supporting wired-OR configurations. It can sink up to 48 mA (IOL), enabling direct connection to multiple 5 V interrupt inputs or pull-up resistors. However, total capacitive load must remain ≤50 pF to meet specified 1.5–24 ns timing; exceeding this degrades setup/hold margins for LE- and CLR-triggered operations in the SN74BCT29853DWR.
Is the SN74BCT29853DWR still in active production?
No - according to Texas Instruments' official packaging addendum, the SN74BCT29853DWR is marked "OBSOLETE". TI discontinued manufacturing, but Aetrix Electronics maintains legacy inventory and offers full traceability, extended lifecycle support, and obsolescence mitigation services for the SN74BCT29853DWR to sustain long-life industrial and defense programs.
SN74BCT29853DWR 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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SN74BCT29853DWR FAQ
1.How can I place an order for SN74BCT29853DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29853DWR 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 SN74BCT29853DWR reliable?
The price and inventory of SN74BCT29853DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT29853DWR is usually 5 days.
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Once your SN74BCT29853DWR 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 SN74BCT29853DWR?
For technical support, including SN74BCT29853DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29853DWR requirements.
6.How does Aetrix verify that SN74BCT29853DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT29853DWR 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 SN74BCT29853DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT29853DWR?
All SN74BCT29853DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29853DWR, 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 SN74BCT29853DWR part is unused and in its original packaging.
Return procedure for SN74BCT29853DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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