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Texas Instruments SN74ABT833DWR
- Part No.:
- SN74ABT833DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT833DWR.pdf
- Description:
- IC TXRX INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
SN74ABT833 from Texas Instruments is an 8-bit to 9-bit parity bus transceiver with integrated parity generator/checker, ERR flag register, and dual-directional data flow control. It operates at 4.5–5.5 V, supports –40°C to 85°C, delivers ±32-mA/64-mA drive strength, and features open-collector ERR output for real-time parity error detection in backplane or multi-board communication systems.
For engineers reviewing the SN74ABT833 datasheet, SN74ABT833 pinout, SN74ABT833 application, or SN74ABT833 equivalent, this device is selected for high-reliability data integrity verification in industrial control backplanes, legacy bus arbitration networks, and fault-tolerant memory subsystems where parity-based error detection must be synchronized with clocked flag capture and isolation control.
Technical Context
The SN74ABT833 implements a synchronous parity-check architecture: on A→B transfer, it generates odd parity across A1–A8 plus PARITY output; on B→A transfer, it validates B1–B8 + PARITY and asserts ERR on mismatch. The ERR flag is edge-triggered by CLK and cleared asynchronously via CLR.
Its BiCMOS EPIC-IIB process enables high-drive outputs (–32 mA IOH, 64 mA IOL), low ground bounce (<1 V VOLP), and latch-up immunity (>500 mA). Dual OE controls (OEA/OEB) allow independent bus isolation, and inverted-parity mode (both OEs low) provides forced-error diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS logic rails and noise margin stability. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems without derating. |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads and long traces in backplane environments. |
| Propagation Delay | tPLH/tPHL ≤ 5.4 ns (VCC = 5 V) - supports >100-MHz bus timing margins in synchronous transfers. |
| Parity Function | Odd-parity generation & checking with registered ERR output - enables deterministic, clock-synchronized error reporting. |
| ESD Protection | >2000 V HBM, >200 V MM - withstands handling and board-level ESD events without latch-up or parameter shift. |
| Input Clamp Current | –18 mA - protects inputs during overvoltage transients without external diodes. |
Pinout & Package
SN74ABT833 is packaged in a 24-pin SOIC (DW) package with 300-mil body width, JEDEC MS-013 compliant, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Output Enable A | Active-low control enabling A-bus drivers; when high, A outputs enter high-impedance state. |
| OEB | Output Enable B | Active-low control enabling B-bus drivers; when high, B outputs enter high-impedance state. |
| CLK | Clock Input | Rising-edge trigger capturing ERR status into internal register; synchronizes error reporting. |
| CLR | Asynchronous Clear | Active-low reset of ERR flag register; clears stored error state independently of CLK. |
| ERR | Open-Collector Parity Error Flag | Active-low open-drain output indicating parity mismatch on B→A transfer; requires external pullup. |
| PARITY | Parity Output/Input | 9th bit carrying generated odd parity (A→B) or received parity (B→A); used in both directions. |
| A1–A8 | A-Bus Data Inputs/Outputs | 8-bit bidirectional I/O port for source data; driven when OEA low, high-Z when OEA high. |
| B1–B8 | B-Bus Data Inputs/Outputs | 8-bit bidirectional I/O port for destination data; driven when OEB low, high-Z when OEB high. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Parity Generator/Checker | Generates odd parity on A→B transfers and validates parity on B→A transfers with hardware logic-no firmware overhead. |
| Clocked ERR Flag Register | Latches parity error status on CLK rising edge, enabling synchronized error sampling in microcontroller or FPGA logic. |
| Inverted-Parity Diagnostic Mode | When both OEA and OEB are low, forces parity error condition-supports system-level diagnostic testing without external stimulus. |
| High-Drive BiCMOS Outputs | –32 mA source / 64 mA sink capability maintains signal integrity across 15-pF loads and 10-cm PCB traces. |
| Robust Bus Isolation | Independent OEA/OEB controls enable selective bus decoupling-prevents contention during hot-swap or power sequencing. |
Applications
| Industrial Backplane Communication | Legacy Memory Subsystem Integrity |
|---|---|
|
Use Scenario: Data exchange between CPU and I/O expansion cards across a 24-bit parallel backplane with shared address/data lines. IC Role / Device Role / Timing Role: SN74ABT833 acts as parity-aware transceiver, generating parity on write cycles and validating parity on read cycles with ERR flag synchronized to system clock. Use Value: Detects single-bit errors in real time before data reaches memory controller, reducing uncorrectable ECC failures in non-ECC DRAM systems. |
Use Scenario: Interfacing a 16-bit microprocessor with dual 8-bit SRAM banks requiring parity-checked access. IC Role / Device Role / Timing Role: SN74ABT833 buffers address/data between processor and SRAM while inserting parity bits on writes and verifying them on reads using dedicated PARITY and ERR signals. Use Value: Enables cost-effective parity protection without modifying processor bus protocol-leverages existing CLK and CLR for deterministic error capture. |
| Programmable Logic Controller (PLC) I/O Module | Fault-Tolerant Sensor Interface Hub |
|
Use Scenario: Aggregating 8-channel analog input data from isolated ADCs into a central PLC CPU via parallel bus. IC Role / Device Role / Timing Role: SN74ABT833 serves as parity-enabling interface, generating parity across digitized sensor values and flagging transmission errors via ERR to watchdog logic. Use Value: Provides hardware-level data path integrity verification-critical for SIL2-certifiable industrial safety functions without software polling latency. |
Use Scenario: Consolidating temperature, pressure, and current readings from 8 field sensors onto a shared diagnostic bus in hazardous-area equipment. IC Role / Device Role / Timing Role: SN74ABT833 transceives sensor data with parity and uses inverted-parity mode (OEA+OEB low) to inject known faults during self-test sequences. Use Value: Validates end-to-end parity logic path-including cabling, connectors, and receiver stages-during pre-operational diagnostics. |
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 |
|---|---|---|---|
| SN74ABT823DW | 8-bit to 9-bit parity transceiver without ERR register; ERR output is combinatorial, not clocked. | Lacks synchronized error capture-unsuitable where error logging must align with system clock domain. | Select SN74ABT823DW only if asynchronous ERR assertion suffices and no clocked flag storage is required. |
| SN74ACT833DW | TTL-compatible CMOS version; lower drive (–24 mA/24 mA), higher propagation delay (≤12 ns), no inverted-parity mode. | Insufficient drive for long backplane traces; lacks diagnostic forced-error capability. | Choose SN74ACT833DW only for low-power, short-distance 5-V systems where speed and drive are secondary to static power reduction. |
Compared with SN74ABT833, SN74ABT823DW omits clocked error registration-limiting use in synchronous logging-while SN74ACT833DW trades drive strength and diagnostic flexibility for lower ICC, making it viable only in benign, low-speed interconnects.
Availability
SN74ABT833 is available at Aetrix Electronics and suitable for industrial backplane communication, legacy memory subsystem integrity, and programmable logic controller (PLC) I/O modules requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT833 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 specializing in analog, embedded processing, and logic solutions with over 50 years of industrial-grade component development.
The SN74ABT833 belongs to TI's ABT logic family-designed specifically for high-speed, high-drive 5-V bus interfacing with robust noise immunity and system-level diagnostic features.
FAQ
What is the function of the PARITY pin on the SN74ABT833?
The PARITY pin on the SN74ABT833 serves as both output and input: during A→B data transfer, it outputs odd parity computed across A1–A8; during B→A transfer, it accepts the corresponding parity bit for validation. This dual-role design enables full 9-bit parity coverage without additional external logic, and its use is mandatory for correct ERR flag assertion on parity mismatch.
How does the SN74ABT833 handle bus isolation during power-up?
The SN74ABT833 enters a high-impedance state on all I/O ports during power-up only if OEA and OEB are held high. To ensure safe isolation, TI recommends tying OEA and OEB to VCC through pullup resistors (value determined by driver sink capability), preventing unintended bus contention before system initialization completes. This behavior is inherent to the BiCMOS input structure and requires no external circuitry beyond the pullups.
Can the SN74ABT833 generate even parity instead of odd parity?
No-the SN74ABT833 is hardwired for odd-parity generation and checking. Its internal logic computes Σ(High bits) mod 2 = 1 for valid parity; there is no configuration pin, register, or external control to select even parity. For even-parity systems, external XOR inversion of the PARITY output and ERR logic would be required-making SN74ABT833 unsuitable without supplemental circuitry.
What is the purpose of the inverted-parity mode in the SN74ABT833?
The inverted-parity mode (activated when both OEA and OEB are low) forces the SN74ABT833 to generate incorrect parity-intentionally creating a parity error condition. This feature enables system-level diagnostics: by asserting ERR under controlled conditions, designers verify downstream error-handling logic, interrupt routing, and flag-clearing sequences without injecting actual data corruption.
Is the ERR output on the SN74ABT833 compatible with 3.3-V logic interfaces?
No-the ERR output is open-collector but rated for 5-V operation only: its absolute maximum voltage is 5.5 V, and it requires a 5-V pullup to function correctly. Connecting ERR directly to a 3.3-V logic input risks overvoltage damage unless level-shifted. TI specifies ERR VOH = 5.5 V (min) under test, confirming it is designed exclusively for 5-V bus environments.
SN74ABT833DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ABT833DWR FAQ
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6.How does Aetrix verify that SN74ABT833DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT833DWR 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 SN74ABT833DWR meets industry standards.
7.What is the process for return or replacement of SN74ABT833DWR?
All SN74ABT833DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT833DWR, 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 SN74ABT833DWR part is unused and in its original packaging.
Return procedure for SN74ABT833DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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