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Texas Instruments SN74BCT534DWR
- Part No.:
- SN74BCT534DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74BCT534DWR.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Inventory:2,000
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Product details
Overview
SN74BCT534DWR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state inverted outputs, designed for bus-driving applications in TTL-compatible systems. It operates at 5 V, supports 70 MHz clock frequency, delivers ±64 mA output drive, features BiCMOS architecture to minimize ICCZ quiescent current, and is qualified for 0°C to 70°C industrial temperature range.
For engineers reviewing the SN74BCT534DWR datasheet, SN74BCT534DWR pinout, SN74BCT534DWR application, or SN74BCT534DWR equivalent, key selection factors include its inverted 3-state output behavior, positive-edge clocking, OE-controlled high-impedance state retention of internal data, and SOIC-20 package compatibility with legacy 5-V bus interface designs.
Technical Context
The SN74BCT534DWR implements eight independent D-type flip-flops, each triggered on the positive edge of CLK to latch the complement of the D-input value onto the Q-output. Its BiCMOS design combines bipolar switching speed with CMOS input impedance and reduced ICCZ standby current.
Output-enable (OE) is buffered and asynchronous: asserting OE = high forces all eight outputs into high-impedance (Z) without affecting internal flip-flop state or clock/data sampling. Internal storage remains fully functional during output disable, enabling seamless data staging before bus release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | BCT (BiCMOS TTL-compatible), ensuring direct replacement for 74LS/74AS logic in 5-V systems |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V rail; no 3.3-V operation supported |
| Clock Frequency | 70 MHz max - enables high-speed data latching in memory buffers and I/O ports |
| Output Drive | ±64 mA (IOL/IOH) - sufficient to drive 50-pF loads with <12 ns propagation delay |
| Propagation Delay | tPLH/tPHL ≤ 11.4 ns - ensures timing closure in fast synchronous bus interfaces |
| Input/Output Capacitance | Ci = 6 pF, Co = 10 pF - minimizes loading on upstream drivers and downstream traces |
| Operating Temperature | 0°C to 70°C - rated for commercial/industrial ambient environments, not extended or military grade |
Pinout & Package
SN74BCT534DWR is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW suffix), 7.5 mm wide, with 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant per TI's historical eco-plan documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (active-high) | Asynchronous control: high = outputs in high-Z; low = normal inverted Q outputs |
| 2–9, 11–18 (1D–8D, 1Q–8Q) | Data inputs / Complemented outputs | Each D-Q pair is inverted: Q = NOT(D) after CLK↑; pins arranged for byte-wide layout |
| 10 (GND) | Ground reference | Power return path for all logic and output stages; requires low-impedance PCB connection |
| 20 (VCC) | Positive supply | 5-V nominal supply; decoupling capacitor required near pin to suppress BiCMOS switching noise |
| 19 (CLK) | Clock input | Positive-edge sensitive; internally buffered to reduce skew and improve noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Inverted 3-state outputs | Eliminates need for external inverters in bus-inversion schemes while enabling shared-bus contention control |
| BiCMOS process technology | Reduces ICCZ to 4.5–7 mA vs. >20 mA in equivalent bipolar TTL, lowering system power at idle |
| Buffered OE input | Prevents false output transitions during OE signal rise/fall; supports clean bus turn-around timing |
| Full parallel D-input access | Enables simultaneous loading of all 8 bits without multiplexing or serialization overhead |
| ESD protection ≥2000 V | Meets MIL-STD-883C Method 3015, supporting handling in non-ESD-controlled assembly environments |
Applications
| Memory Buffer Register | I/O Port Interface |
|---|---|
Use Scenario: Latching address/data between microcontroller and external SRAM or EPROM. IC Role / Device Role / Timing Role: Acts as an octal transparent latch with edge-triggered capture and 3-state bus isolation. Use Value: Enables clean separation of read/write cycles via OE control, preventing bus contention during memory access arbitration. |
Use Scenario: Bidirectional data transfer between 8-bit MCU and peripheral devices (e.g., ADC, DAC, display controller). IC Role / Device Role / Timing Role: Provides direction-controlled, inverted data buffering with synchronized sampling on CLK↑. Use Value: Eliminates external pull-ups and direction logic by combining inversion, latching, and high-Z control in one SOIC-20 device. |
| Bus Transceiver Stage | Working Register File |
Use Scenario: Driving long PCB traces or backplane stubs in industrial control backplanes. IC Role / Device Role / Timing Role: Functions as a low-skew, high-drive bus driver with programmable output enable. Use Value: Delivers 64 mA sink/source capability and <12 ns tPLH/tPHL to maintain signal integrity across 50-pF distributed loads. |
Use Scenario: Storing intermediate computation results in fixed-function digital controllers (e.g., motor commutation logic). IC Role / Device Role / Timing Role: Serves as a static 8-bit working register with retained state during OE assertion. Use Value: Allows internal pipeline staging - new data can be loaded while prior result remains held and isolated from bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state outputs applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT534N | ACT family: 3.3-V tolerant inputs, 5-V supply; higher speed (tPD ≈ 7 ns), lower drive (±24 mA) | Requires level-shifting for legacy 5-V-only systems; unsuitable where >48 mA bus drive is needed | Select when migrating to mixed-voltage systems with tighter timing budgets and lower power constraints |
| 74F534N | F-family: ECL-derived TTL, 5-V only; faster (tPD ≈ 5 ns) but higher ICCZ (≈15 mA), no BiCMOS power advantage | Lacks OE-buffering robustness; more susceptible to noise-induced output glitches during OE transitions | Choose only for legacy F-series designs requiring maximum speed and where power efficiency is secondary |
Compared with SN74ACT534N and 74F534N, the SN74BCT534DWR offers superior bus-drive strength and lower standby current in pure 5-V environments, making it optimal for cost-sensitive industrial I/O modules where reliability under capacitive loading is critical.
Availability
SN74BCT534DWR is available at Aetrix Electronics and suitable for memory buffer registers, industrial I/O port interfaces, bus transceiver stages, and working register files requiring stable component supply despite its obsolete status.
Supply support for SN74BCT534DWR 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 BCT logic family was developed by Texas Instruments to bridge TTL performance and CMOS power efficiency, targeting high-reliability 5-V bus interface and register applications in industrial control and instrumentation.
FAQ
What is the operating voltage range for SN74BCT534DWR?
The SN74BCT534DWR operates over a supply voltage range of 4.5 V to 5.5 V. It is not rated for 3.3-V operation. Absolute maximum VCC is 7 V, but sustained operation outside the recommended 4.5–5.5 V range may compromise timing, drive strength, or reliability. All electrical characteristics in the datasheet are specified at VCC = 5 V.
Does SN74BCT534DWR support true bidirectional data flow?
No - the SN74BCT534DWR is unidirectional: data flows from D inputs to inverted Q outputs on CLK↑. Bidirectional bus control requires pairing with complementary devices or using dedicated transceivers. Its 3-state outputs allow shared-bus arbitration, but internal logic path is strictly D → Q (inverted), not reversible.
Is SN74BCT534DWR pin-compatible with SN74LS534 or SN74ALS534?
Yes - SN74BCT534DWR shares identical pinout, function table, and SOIC-20 (DW) footprint with SN74LS534 and SN74ALS534. However, it is not a drop-in replacement due to differences in drive strength (±64 mA vs. ±24 mA), propagation delay (<12 ns vs. ~18 ns), and ICCZ (4.5–7 mA vs. >15 mA). System-level timing and loading must be re-verified.
What does the "BCT" designation indicate in SN74BCT534DWR?
"BCT" denotes Texas Instruments' BiCMOS-Compatible TTL logic family. It integrates bipolar transistors for high-speed switching and CMOS circuitry for low input current and reduced ICCZ. This architecture delivers LS-level speed with significantly lower quiescent power than standard TTL, while maintaining full 5-V TTL voltage thresholds and drive compatibility.
Can SN74BCT534DWR outputs be safely tied together in wired-OR configuration?
No - SN74BCT534DWR outputs are push-pull (not open-collector) and actively drive both high and low states. Direct tying risks destructive current flow if outputs conflict. Wired-OR requires open-drain/open-collector topology. Use the 3-state OE control instead to share a common bus line safely among multiple SN74BCT534DWR devices.
SN74BCT534DWR 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:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
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SN74BCT534DWR FAQ
1.How can I place an order for SN74BCT534DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT534DWR 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 SN74BCT534DWR reliable?
The price and inventory of SN74BCT534DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT534DWR is usually 5 days.
3.What payment methods are accepted for SN74BCT534DWR?
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4.How is shipping managed for SN74BCT534DWR?
SN74BCT534DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT534DWR 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 SN74BCT534DWR?
For technical support, including SN74BCT534DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT534DWR requirements.
6.How does Aetrix verify that SN74BCT534DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT534DWR 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 SN74BCT534DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT534DWR?
All SN74BCT534DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT534DWR, 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 SN74BCT534DWR part is unused and in its original packaging.
Return procedure for SN74BCT534DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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