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Texas Instruments SN74ABT853DWR
- Part No.:
- SN74ABT853DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT853DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
SN74ABT853DWR from Texas Instruments is an 8-bit to 9-bit parity bus transceiver with integrated parity generator/checker, ERR flag latch, and high-drive outputs (−32 mA IOH, 64 mA IOL). It operates from 4.5 V to 5.5 V over −40°C to 85°C and supports bidirectional data transfer between A and B buses with real-time parity error detection in industrial backplane and memory subsystem applications.
For engineers reviewing the SN74ABT853DWR datasheet, SN74ABT853DWR pinout, SN74ABT853DWR application, or SN74ABT853DWR equivalent, key selection considerations include its 24-pin SOIC-DW package, open-collector ERR output with latch/clear control, true data output logic, and compatibility with TTL-level signaling in legacy bus integrity systems.
Technical Context
The SN74ABT853DWR implements a dual-directional 8-bit bus interface with dedicated 9th-bit parity generation (odd parity) and checking logic. Its internal architecture includes separate OEA/OEB enable controls, LE/CLR for ERR flag sampling and storage, and EPIC-IIB™ BiCMOS circuitry enabling low ground bounce (<1 V VOLP) and high noise immunity.
It features three distinct operational modes: A→B data transfer with parity generation, B→A data + parity transfer with error checking, and high-impedance isolation when both OEA and OEB are high. The ERR output is open-collector and latched; PARITY is actively driven, and all I/Os maintain high-impedance during power-up/down (VCC < 2.1 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Operating Temperature | −40°C to 85°C - Qualified for commercial and industrial ambient environments, not extended/military grade. |
| Output Drive | −32 mA IOH / 64 mA IOL - Supports heavy capacitive loads and fan-out to multiple TTL inputs on shared buses. |
| Propagation Delay | 1.2 ns to 6.4 ns (A↔B), 2.1 ns to 13.3 ns (A→PARITY) - Enables sub-10-ns timing-critical parity validation in high-speed backplanes. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic levels for direct interfacing with legacy controllers and FPGAs. |
| ESD Protection | >2000 V HBM, >200 V MM - Provides robust handling during board assembly and field maintenance without external protection. |
| Power-Up State | High-impedance below 2.1 V VCC - Prevents bus contention during uncontrolled power sequencing in multi-rail systems. |
Pinout & Package
SN74ABT853DWR is housed in a 24-pin SOIC (DW) package measuring 7.5 mm × 15.4 mm × 2.35 mm, RoHS-compliant with NiPdAu lead finish and JEDEC Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Output Enable A | Active-low control enabling A-port drivers; when high, A-side outputs enter high-Z state. |
| OEB | Output Enable B | Active-low control enabling B-port drivers; independent of OEA for asymmetric bus control. |
| LE | Latch Enable | Edge-triggered input capturing current ERR state into internal register for diagnostic readback. |
| CLR | Clear Input | Asynchronous active-low reset of ERR latch; clears stored error flag regardless of LE state. |
| ERR | Parity Error Flag | Open-collector output asserting low on detected parity mismatch; requires external pull-up for logic-high. |
| PARITY | Generated Parity Bit | Actively driven odd-parity bit reflecting A-bus data; used as input during B→A error-checking mode. |
| A1–A8 | A-Bus Data Inputs/Outputs | Bidirectional 8-bit port connected to source system (e.g., CPU or controller); true (non-inverted) data path. |
| B1–B8 | B-Bus Data Inputs/Outputs | Bidirectional 8-bit port connected to destination system (e.g., memory or peripheral); true data path. |
| VCC | Power Supply | +5 V supply rail; must be stabilized before enabling outputs to avoid metastability or bus glitches. |
| GND | Ground Reference | Common return path for all I/O and internal logic; requires low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Parity Generator/Checker | Generates odd parity on A→B transfers and validates parity on B→A transfers-eliminates need for external XOR networks. |
| Latched Parity-Error Flag | ERR state can be sampled, stored via LE, and cleared via CLR-enables non-intrusive error logging in interrupt-driven firmware. |
| High-Drive Outputs | −32 mA source / 64 mA sink capability drives long traces and multiple TTL loads without buffers-reduces BOM count in dense backplanes. |
| Power-Up/Down High-Z | Automatic tri-state activation when VCC < 2.1 V prevents bus conflicts during hot-swap or brownout conditions-no external power sequencer required. |
| EPIC-IIB™ BiCMOS Process | Combines bipolar speed and CMOS low static power-delivers 1.2 ns min propagation delay with <250 µA ICC in disabled state. |
Applications
| Industrial Backplane Integrity | Legacy Memory Subsystem |
|---|---|
Use Scenario: Bidirectional data routing between CPU and expansion slots in programmable logic controllers (PLCs), where bus corruption must be detected before write cycles commit. IC Role / Device Role / Timing Role: Parity transceiver performing real-time A→B parity generation and B→A error checking with sub-10 ns latency. Use Value: Detects single-bit errors on 8-bit parallel buses before data reaches memory or I/O peripherals-prevents silent data corruption in safety-critical automation. |
Use Scenario: Interfacing microcontrollers to external SRAM or EPROM banks requiring hardware parity validation per access cycle. IC Role / Device Role / Timing Role: Generates and checks odd parity across address/data lines during read/write operations using dedicated PARITY and ERR signals. Use Value: Eliminates need for software parity calculation-reduces CPU overhead by 3–5 cycles per memory transaction while maintaining deterministic timing. |
| Telecom Line Card Diagnostics | Test Equipment Bus Monitoring |
Use Scenario: Embedded diagnostics in TDM line cards verifying integrity of configuration registers and firmware update payloads transferred over parallel control buses. IC Role / Device Role / Timing Role: ERR flag latched on LE edge provides timestamped error capture; CLR enables automated fault recovery sequences. Use Value: Enables root-cause analysis of intermittent bus faults without oscilloscope intervention-supports remote service via JTAG-accessible status registers. |
Use Scenario: In-circuit bus analyzers monitoring legacy instrumentation buses (e.g., GPIB-parallel variants) for parity violations during calibration sequences. IC Role / Device Role / Timing Role: Transparently inserted between master and slave devices to inject/observe PARITY and monitor ERR without altering signal timing. Use Value: Provides hardware-level error visibility at full bus speed-detects marginal signal integrity issues missed by protocol-layer CRC checks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parity transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT854DWR | Same pinout and function but includes inverted parity mode (forced error) activated when both OEA and OEB are low-adds diagnostic flexibility. | Required where system-level parity inversion is needed for fault injection testing or redundancy verification. | Select SN74ABT854DWR only if forced-error capability is explicitly required; otherwise SN74ABT853DWR offers identical core functionality with simpler control logic. |
| 74F688PC | 8-bit magnitude comparator (not parity transceiver); no PARITY/ERR logic, no bidirectional bus interface, no latch/clear controls. | Used for address decoding or data matching-not applicable for parity generation/checking tasks. | Not a functional alternative; included only as common mis-selection due to similar part numbering-verify function before substitution. |
Compared with SN74ABT854DWR, SN74ABT853DWR lacks forced-error mode but simplifies control logic and reduces risk of accidental parity inversion; versus 74F688PC, it delivers complete parity infrastructure absent in comparators-making SN74ABT853DWR the only valid drop-in solution for bus integrity applications requiring hardware parity.
Availability
SN74ABT853DWR is available at Aetrix Electronics and suitable for industrial backplane integrity, legacy memory subsystems, telecom line card diagnostics, and test equipment bus monitoring requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT853DWR 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 innovation in industrial and automotive electronics.
The SN74ABT853DWR belongs to TI's ABT logic family-designed specifically for high-speed, high-drive 5-V bus interfacing with enhanced noise immunity and power efficiency in mission-critical data-path applications.
FAQ
What is the function of the ERR output on the SN74ABT853DWR?
The ERR output on the SN74ABT853DWR is an open-collector parity error flag that asserts low when a parity mismatch is detected during B→A data transfer with parity. It reflects real-time bus integrity status and can be latched via LE or cleared asynchronously via CLR. The SN74ABT853DWR requires an external pull-up resistor to define its high state, and its behavior is fully documented in the ERROR-FLAG FUNCTION TABLE of the datasheet.
Does the SN74ABT853DWR support 3.3-V operation?
No, the SN74ABT853DWR is specified only for 4.5 V to 5.5 V supply operation and does not support 3.3-V logic levels. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL compatibility. Using it with 3.3-V systems risks undriven inputs, incorrect logic interpretation, or excessive current draw-designers must use level translators or select a 3.3-V-compatible alternative such as the SN74LVC8T245.
How does the SN74ABT853DWR handle power sequencing?
The SN74ABT853DWR enters a guaranteed high-impedance state when VCC drops below 2.1 V during power-down and remains in high-Z until VCC exceeds that threshold during power-up-preventing bus contention in multi-rail systems. To ensure clean isolation above 2.1 V, OE pins should be tied to VCC via a pullup resistor sized per the driver's sink capability. This behavior is intrinsic to the SN74ABT853DWR and requires no external reset circuitry.
Can the SN74ABT853DWR generate even parity?
No, the SN74ABT853DWR generates and checks odd parity exclusively. Its internal logic computes Σ(A1–A8) mod 2 = 1 for valid parity, and the ERR output activates only when the sum of B1–B8 plus PARITY yields an even result. There is no provision for even-parity mode in the SN74ABT853DWR design-systems requiring even parity must implement external XOR inversion or select a different device with configurable parity mode.
What is the maximum capacitive load the SN74ABT853DWR can drive on its B-bus outputs?
The SN74ABT853DWR B-bus outputs (B1–B8) are rated for 64 mA low-level sink current at VO = 0.55 V, supporting typical PCB trace capacitances up to ~100 pF while maintaining ≤6.4 ns propagation delay (per datasheet switching characteristics). For loads exceeding this-such as driving >10 TTL inputs or >15 cm of 50-Ω trace-the SN74ABT853DWR may exhibit timing skew or voltage droop; designers should verify signal integrity with IBIS simulation or bench measurement using the actual SN74ABT853DWR layout.
SN74ABT853DWR 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:
- Active
- Logic Type:
- Transceiver, Non-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
SN74ABT853DWR FAQ
1.How can I place an order for SN74ABT853DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT853DWR 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 SN74ABT853DWR reliable?
The price and inventory of SN74ABT853DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT853DWR is usually 5 days.
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SN74ABT853DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT853DWR 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 SN74ABT853DWR?
For technical support, including SN74ABT853DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT853DWR requirements.
6.How does Aetrix verify that SN74ABT853DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT853DWR 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 SN74ABT853DWR meets industry standards.
7.What is the process for return or replacement of SN74ABT853DWR?
All SN74ABT853DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT853DWR, 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 SN74ABT853DWR part is unused and in its original packaging.
Return procedure for SN74ABT853DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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