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Texas Instruments SN74BCT2953DW
- Part No.:
- SN74BCT2953DW
- Manufacturer:
- Texas Instruments
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- -
- Datasheet:
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SN74BCT2953DW.pdf
- Description:
- REGISTERED BUS TRANSCEIVER
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Product details
Overview
SN74BCT2953DW from Texas Instruments is an octal bus transceiver with two 8-bit back-to-back registers enabling bidirectional data flow between A and B buses. It operates at 5 V, supports up to 110 MHz clock frequency, delivers 64 mA sink capability on B ports, and features inverting outputs for TTL-compatible interfacing in memory and bus isolation applications.
For engineers reviewing the SN74BCT2953DW datasheet, SN74BCT2953DW pinout, SN74BCT2953DW application, or SN74BCT2953DW equivalent, key selection criteria include its dual-register clocking architecture, asymmetric drive strength (24 mA A-port / 64 mA B-port), OE-controlled three-state outputs, and SOIC-24 packaging for high-density board layouts.
Technical Context
The SN74BCT2953DW implements a BiCMOS-based dual 8-bit register architecture with independent clock-enable (CLKENAB/CLKENBA) and output-enable (OEAB/OEBA) controls per direction. Data latching occurs on the low-to-high transition of CLKAB or CLKBA when the corresponding CLKEN input is low.
It provides directionally asymmetric I/O drive: A-port outputs source 3 mA / sink 24 mA, while B-port outputs source 15 mA / sink 64 mA. All outputs are inverting, and the device is characterized for 0°C to 70°C operation with 4.5 V–5.5 V supply tolerance.
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. |
| Max Clock Frequency | 110 MHz - supports high-speed synchronous bus transfers in memory interface and data acquisition systems. |
| B-Port Sink Current | 64 mA - enables direct driving of multiple TTL loads or LED indicators without external buffers. |
| A-Port Sink Current | 24 mA - sufficient for interfacing with standard 5 V logic families and small-signal peripherals. |
| Propagation Delay (tPLH/tPHL) | 2.5 ns to 10.2 ns - guarantees sub-10 ns timing margins for 100 MHz system clocks with setup/hold compliance. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded and industrial control environments. |
| Input Clamp Current | −18 mA - protects against transient overvoltage events on control inputs during hot-insertion or ESD events. |
Pinout & Package
SN74BCT2953DW uses a 24-pin SOIC (DW) package with 300-mil body width and standard gull-wing lead form. Pin spacing is 0.050 inch (1.27 mm), compatible with automated SMT assembly and IPC-7351B footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | B8 to B1 | Active-low inverting outputs for B-side bus; driven only when OEBA = L and CLKBA↑ sampled with CLKENBA = L. |
| 9, 10, 11, 13, 14, 15, 16, 17 | A1 to A8 | Active-low inverting outputs for A-side bus; driven only when OEAB = L and CLKAB↑ sampled with CLKENAB = L. |
| 12 | GND | Power ground reference for all internal logic and I/O stages; must be low-impedance connection. |
| 24 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor (0.1 µF) required within 10 mm of this pin. |
| 18, 19, 20 | OEBA, CLKENBA, CLKBA | Control inputs for B→A data path: OEBA enables B-port outputs; CLKENBA gates CLKBA edge sampling. |
| 21, 22, 23 | OEAB, CLKENAB, CLKAB | Control inputs for A→B data path: OEAB enables A-port outputs; CLKENAB gates CLKAB edge sampling. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ quiescent current to 2–5 mA, lowering standby power in always-on bus interfaces. |
| Dual independent 8-bit register banks | Enables simultaneous A→B and B→A data staging without contention, supporting full-duplex memory-mapped I/O. |
| Asymmetric output drive strength | B-port's 64 mA sink supports legacy TTL fanout (10×) while A-port's 24 mA matches modern microcontroller I/O limits. |
| Inverting output polarity | Matches standard TTL bus transceiver conventions, eliminating need for external inverters in existing 74-series designs. |
| ESD protection >2000 V | Meets MIL-STD-883C Method 3015, allowing safe handling and board-level integration without additional protection circuitry. |
Applications
| Memory Bus Isolation | Microcontroller Peripheral Interface |
|---|---|
|
Use Scenario: Isolating address/data buses between CPU and SRAM/ROM in 8-bit embedded systems to prevent contention during DMA or multi-master arbitration. IC Role / Device Role / Timing Role: Bidirectional latch acting as a clocked bus barrier; samples and holds data on CLKAB/CLKBA edges under OE and CLKEN control. Use Value: Prevents bus conflicts during memory refresh cycles and enables deterministic timing via 110 MHz max clock rate and sub-10 ns propagation delays. |
Use Scenario: Interfacing an 8-bit microcontroller's parallel port with external peripherals such as LCD controllers or ADCs requiring separate read/write strobes. IC Role / Device Role / Timing Role: Direction-controlled transceiver providing isolated, latched data paths between MCU port pins and peripheral I/O lines. Use Value: Eliminates need for discrete latches and direction logic; B-port's 64 mA drive directly drives LCD segment drivers or optocoupler inputs. |
| Legacy System Bus Expansion | Industrial I/O Module Buffering |
|
Use Scenario: Extending ISA or similar 8-bit parallel buses in retro-computing or test equipment where signal integrity degrades over long traces. IC Role / Device Role / Timing Role: Active repeater with registered delay, regenerating and retiming signals across bus segments using local clock domains. Use Value: Maintains timing margin with 2.5 ns min tSU and 1.5 ns min tH; inverting outputs preserve logic polarity across expansion links. |
Use Scenario: Buffering digital I/O lines in programmable logic controller (PLC) modules where field-side signals require noise immunity and high-current drive. IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between low-power logic and industrial actuators/sensors. Use Value: B-port's 64 mA sink capability directly drives 24 V DC solenoids via external pull-up resistors; ESD rating simplifies field-side PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT2953DW | CMOS process; lower ICCZ (1 µA typical), but B-port sink limited to 24 mA; non-inverting outputs. | Suitable for low-power, low-noise systems where drive strength and polarity match newer logic families. | Select when power efficiency and compatibility with ACT-series logic outweigh need for high-current B-port drive. |
| 74F2953PC | Bipolar F-family; 100 MHz max clock; B-port sink 64 mA; inverting outputs; PDIP-24 only. | Preferred for through-hole prototyping or legacy repair where SOIC footprint is incompatible. | Choose for hand-soldered or socketed designs requiring identical functionality in DIP format. |
Compared with SN74BCT2953DW, SN74ACT2953DW reduces static power but sacrifices B-port drive and output polarity; 74F2953PC retains full electrical equivalence but lacks SOIC packaging and modern ESD robustness.
Availability
SN74BCT2953DW is available at Aetrix Electronics and suitable for memory bus isolation, microcontroller peripheral interfacing, and industrial I/O module buffering requiring stable component supply despite its obsolete status.
Supply support for SN74BCT2953DW 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 SN74BCT2953DW belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, designed specifically for high-speed, high-drive bidirectional bus interfacing in 5 V systems with mixed-technology signal domains.
FAQ
What is the primary function of the SN74BCT2953DW in a digital system?
The SN74BCT2953DW functions as an octal bidirectional bus transceiver with dual 8-bit registered paths. It latches and isolates data flowing between two buses-A and B-using independent clock and enable controls. Its inverting outputs, 64 mA B-port sink capability, and 110 MHz clock support make it ideal for memory bus isolation and microcontroller peripheral interfacing in 5 V TTL systems. The SN74BCT2953DW ensures deterministic timing and prevents bus contention in synchronous digital architectures.
Does the SN74BCT2953DW support both A-to-B and B-to-A data transfer simultaneously?
No, the SN74BCT2953DW does not support true simultaneous bidirectional transfer. While it contains two independent 8-bit register banks (A→B and B→A), each path requires its own dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) signals. Data can be staged in both directions, but output enable must be controlled separately to avoid bus contention. The SN74BCT2953DW relies on external sequencing logic to coordinate direction switching safely.
What are the absolute maximum ratings for VCC and operating temperature of the SN74BCT2953DW?
The SN74BCT2953DW has an absolute maximum supply voltage (VCC) of −0.5 V to 7 V and an absolute maximum operating free-air temperature range of 0°C to 70°C. Exceeding these limits-even momentarily-may cause permanent damage. The device is characterized for reliable operation only within the recommended range of 4.5 V to 5.5 V at 0°C to 70°C. The SN74BCT2953DW also specifies a storage temperature range of −65°C to 150°C for unpowered devices.
Can the SN74BCT2953DW be used with 3.3 V logic systems?
No, the SN74BCT2953DW is not designed for 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V TTL compatibility. Driving its inputs from 3.3 V logic may result in marginal noise margins or unreliable switching. For 3.3 V systems, TI recommends alternatives like the SN74LVC245A. The SN74BCT2953DW must be used in 5 V-only domains.
Is the SN74BCT2953DW pin-compatible with other members of the 74xx2953 family?
Yes, the SN74BCT2953DW shares identical pinout and functional behavior with other 24-pin variants in the 74xx2953 family-including the SN74BCT2953NT (PDIP) and SN74ACT2953DW-across all 24 pins. Signal names, positions, and electrical roles (e.g., A1–A8, B1–B8, CLKAB, OEBA) are consistent. However, differences in process technology, drive strength, and output polarity mean that direct substitution requires verification of timing, loading, and logic polarity requirements. The SN74BCT2953DW remains electrically and physically interchangeable within its own DW-package variants.
SN74BCT2953DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
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- Input Type:
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- Current - Output High, Low:
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- Operating Temperature:
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SN74BCT2953DW FAQ
1.How can I place an order for SN74BCT2953DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2953DW 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 SN74BCT2953DW reliable?
The price and inventory of SN74BCT2953DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2953DW is usually 5 days.
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SN74BCT2953DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2953DW 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 SN74BCT2953DW?
For technical support, including SN74BCT2953DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2953DW requirements.
6.How does Aetrix verify that SN74BCT2953DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT2953DW 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 SN74BCT2953DW meets industry standards.
7.What is the process for return or replacement of SN74BCT2953DW?
All SN74BCT2953DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2953DW, 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 SN74BCT2953DW part is unused and in its original packaging.
Return procedure for SN74BCT2953DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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