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Texas Instruments SN74BCT756DWR
- Part No.:
- SN74BCT756DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT756DWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,241
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Product details
Overview
SN74BCT756DWR from Texas Instruments is an octal buffer/driver IC with open-collector outputs, designed for memory address bus driving and clock distribution in 5-V TTL-compatible systems. It features dual 4-bit channels, symmetrical output-enable (OE) inputs, 64 mA sink capability per output, 4.5–5.5 V supply operation, and operates from 0°C to 70°C.
For engineers reviewing the SN74BCT756DWR datasheet, SN74BCT756DWR pinout, SN74BCT756DWR application, or SN74BCT756DWR equivalent, key selection criteria include open-collector drive strength, BiCMOS low ICCZ quiescent current, propagation delay (≤11.3 ns), 20-pin SOIC (DW) package compatibility, and bus-interface timing margins in legacy industrial control and memory subsystems.
Technical Context
The SN74BCT756DWR implements two independent 4-bit non-inverting buffer sections, each with dedicated OE control and open-collector outputs. Its BiCMOS process enables high-speed switching (tPHL as low as 0.5 ns) while limiting ICCZ to 6–10 mA during output disable.
Each output supports up to 64 mA sink current at VOL ≤ 0.55 V (VCC = 4.5 V), and input thresholds meet standard TTL levels (VIH ≥ 2 V, VIL ≤ 0.8 V). The device lacks internal pull-ups and requires external termination for wired-AND or bus arbitration use cases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5-V TTL and BCT logic families without level-shifting. |
| Output Sink Current | 64 mA per channel - Supports direct driving of 50-Ω transmission lines or multiple TTL inputs on shared buses. |
| Propagation Delay | tPHL ≤ 4.2 ns, tPLH ≤ 11.3 ns - Enables reliable timing in address latching and clock fanout up to ~100 MHz. |
| Input Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - Matches standard TTL voltage levels for seamless integration into legacy 5-V systems. |
| Quiescent ICCZ | 6–10 mA (OE disabled) - BiCMOS design minimizes standby power in high-density memory driver applications. |
| ESD Protection | >2000 V HBM, >200 V MM - Meets MIL-STD-883 requirements for robustness in industrial handling and assembly. |
Pinout & Package
SN74BCT756DWR uses a 20-pin SOIC (DW) package with 0.300-inch body width, 1.27 mm pitch, and 2.65 mm max height. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 and Channel 2 respectively; both must be low for output assertion. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Non-inverting data inputs for eight buffer channels; TTL-compatible voltage thresholds apply. |
| 18, 16, 14, 12, 9, 7, 5, 3 | 1Y1–1Y4, 2Y1–2Y4 | Open-collector outputs - require external pull-up for logic HIGH; support wired-AND and bus arbitration. |
| 10 | GND | Ground reference for all I/O and internal circuitry; must be low-impedance for noise immunity. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required within 1 cm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to 6–10 mA during output disable, lowering system-level standby power in multi-driver configurations. |
| Open-collector outputs | Enable wired-AND bus structures and interface with mixed-voltage peripherals via external pull-up selection. |
| Symmetrical OE inputs | Allow independent enable/disable control of two 4-bit channels, supporting staggered address strobing or clock gating. |
| TTL-compatible input thresholds | Eliminate need for level shifters when interfacing with legacy 74LS/74F or microcontroller GPIOs operating at 5 V. |
| 2000-V HBM ESD rating | Supports robust handling in manufacturing environments without additional protection circuitry on PCB. |
Applications
| Memory Address Buffering | Legacy Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus lines from a microprocessor to multiple SRAM or EPROM chips in industrial PLC backplanes. IC Role / Device Role / Timing Role: Non-inverting octal buffer with open-collector outputs provides current gain and bus isolation between CPU and memory devices. Use Value: 64 mA sink per output ensures clean signal integrity across 10+ inch traces with 50-Ω characteristic impedance and TTL load stacking. |
Use Scenario: Interfacing a Z80 or 8086 CPU to peripheral I/O devices sharing a common data/address bus with arbitration logic. IC Role / Device Role / Timing Role: Dual-channel buffer enables independent enable control for address vs. data phases, reducing bus contention. Use Value: Symmetrical OE inputs and sub-5 ns tPHL allow precise setup/hold margin compliance in 4–6 MHz CPU cycles. |
| Programmable Logic Driver | Industrial Clock Distribution |
|
Use Scenario: Output stage for GAL/PAL-based address decoders where wired-AND logic combines multiple chip-select signals. IC Role / Device Role / Timing Role: Open-collector outputs implement active-low CS summation without external diodes or resistors. Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA enables reliable low-state detection even under worst-case trace loading and temperature drift. |
Use Scenario: Fanout of a master clock signal to multiple synchronous peripherals (e.g., ADCs, DACs, UARTs) in test equipment. IC Role / Device Role / Timing Role: Low-skew buffer with matched tPLH/tPHL paths maintains phase alignment across eight downstream clocks. Use Value: Propagation delay variation ≤ 1.8 ns (tPLH–tPHL spread) preserves timing margins in 25-MHz clock trees with <1 ns jitter tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal open-collector buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT757DWR | Inverting outputs instead of non-inverting; identical pinout, timing, and drive strength. | Requires logic inversion in upstream signal path; suitable where active-low buffering is preferred. | Select when system architecture mandates inverted enable or address polarity - no layout change needed. |
| SN74ACT756DWR | ACT family: CMOS input structure (higher VIH/VIL), 5-V only, lower ICCZ (~1 µA), same open-collector outputs. | Better noise immunity and lower static power, but less tolerant of marginal TTL input drive. | Prefer for new designs targeting ultra-low standby current; verify source drive strength meets ACT input specs. |
Compared with SN74BCT756DWR, SN74BCT757DWR offers functional inversion without altering board layout, while SN74ACT756DWR reduces quiescent current by >99% but requires stricter input voltage compliance - both serve distinct trade-offs in legacy upgrade or green-design contexts.
Availability
SN74BCT756DWR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy memory subsystems, and programmable logic interface circuits requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT756DWR 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 SN74BCT756DWR belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered for high-speed, low-power 5-V bus interface applications in memory and microprocessor systems.
FAQ
What is the maximum sink current per output of the SN74BCT756DWR?
The SN74BCT756DWR supports up to 64 mA sink current per output at VCC = 4.5 V with VOL ≤ 0.55 V. This rating is specified under recommended operating conditions and validated across the full 0°C to 70°C temperature range. Exceeding this current may cause VOL to rise beyond specification limits or induce thermal stress in sustained operation.
Does the SN74BCT756DWR have internal pull-up resistors on its outputs?
No, the SN74BCT756DWR does not include internal pull-up resistors. Its outputs are strictly open-collector and require external pull-up resistors to establish HIGH logic levels. Typical values range from 1 kΩ to 10 kΩ depending on bus capacitance, speed requirements, and voltage rail - e.g., 4.7 kΩ for 5-V TTL-compatible operation with ≤50 pF load.
Can the SN74BCT756DWR operate at 3.3 V?
No, the SN74BCT756DWR is not rated for 3.3 V operation. Its absolute maximum VCC is 7 V, but the recommended operating range is 4.5 V to 5.5 V. Input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output drive characteristics are optimized for 5-V TTL systems; operation below 4.5 V risks undefined logic states and degraded VOL performance.
What is the function of pins 1 and 19 on the SN74BCT756DWR?
Pins 1 and 19 are the active-low output-enable inputs 1OE and 2OE, controlling the two independent 4-bit buffer channels. When either OE pin is HIGH, its corresponding four outputs enter high-impedance (disabled) state. Both OEs must be LOW for their respective outputs to respond to input changes - enabling selective channel activation in multiplexed address or data paths.
Is the SN74BCT756DWR pin-compatible with the SN74BCT756N?
Yes, the SN74BCT756DWR (SOIC-20) and SN74BCT756N (PDIP-20) share identical pin numbering, signal assignment, and electrical functionality. They differ only in package type and thermal characteristics (θJA = 97°C/W for DW vs. 67°C/W for N), making them direct drop-in replacements where board layout accommodates the mechanical form factor.
SN74BCT756DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- Open Collector
- Current - Output High, Low:
- -, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT756DWR FAQ
1.How can I place an order for SN74BCT756DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT756DWR 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 SN74BCT756DWR reliable?
The price and inventory of SN74BCT756DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT756DWR is usually 5 days.
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SN74BCT756DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT756DWR 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 SN74BCT756DWR?
For technical support, including SN74BCT756DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT756DWR requirements.
6.How does Aetrix verify that SN74BCT756DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT756DWR 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 SN74BCT756DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT756DWR?
All SN74BCT756DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT756DWR, 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 SN74BCT756DWR part is unused and in its original packaging.
Return procedure for SN74BCT756DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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