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Texas Instruments SN64BCT757DW
- Part No.:
- SN64BCT757DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN64BCT757DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,026
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Product details
Overview
SN64BCT757DW from Texas Instruments is an octal noninverting buffer/driver with open-collector outputs, designed for memory address and bus driving applications. It features complementary output-enable inputs (1OE and 2OE), operates from –40°C to 85°C, supports 5-V supply, and delivers 64 mA low-level output current with 0.55 V max VOL at IOL = 64 mA.
For engineers reviewing the SN64BCT757DW datasheet, SN64BCT757DW pinout, SN64BCT757DW application, or SN64BCT757DW equivalent, key selection criteria include open-collector drive capability, BiCMOS power efficiency, high-impedance state during power sequencing, and SOIC-20 package compatibility with legacy 300-mil DIP footprints.
Technical Context
The SN64BCT757DW implements dual 4-bit noninverting buffers with independent active-low and active-high output-enable controls (1OE and 2OE), enabling flexible bus arbitration. Each of the eight outputs is open-collector, allowing wired-AND logic and direct interface to terminated bus lines without external pull-ups in many configurations.
Its BiCMOS process ensures low ICCZ (10 mA typical quiescent current with outputs disabled) and fast switching: tPHL as low as 2.4 ns (A→Y, VCC = 5 V, TA = 25°C), while maintaining ESD robustness (>2000 V HBM, >200 V MM) and safe power-up/power-down behavior via inherent high-impedance state.
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 systems and margin against rail droop. |
| Output Drive | 64 mA sink per output - sufficient to drive 50-Ω transmission lines or multiple TTL inputs directly. |
| Propagation Delay | tPHL = 2.4 ns (min), tPLH = 6.9 ns (min) - enables high-speed address buffering in fast memory subsystems. |
| VOL @ IOL=64mA | 0.55 V max - guarantees solid logic-low margin under full load, critical for noise immunity on shared buses. |
| Input Clamp Current | –18 mA - protects inputs during overvoltage transients without requiring external clamps. |
| Power-Up State | High-impedance outputs - prevents bus contention during system reset or brown-out conditions. |
| ESD Rating | >2000 V HBM - meets industrial-grade handling requirements without special ESD precautions. |
Pinout & Package
SN64BCT757DW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, with 1.27 mm pitch and maximum height of 2.65 mm - compatible with automated SMT placement and reflow profiles (MSL Level-1, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Complementary output-enable controls: 1OE active-low, 2OE active-high - allows synchronous or staggered enable control of two 4-bit groups. |
| 2, 4, 6, 8 | 1A1–1A4 | Inputs for first 4-bit buffer group - routed to corresponding Y outputs when 1OE is asserted. |
| 11, 13, 15, 17 | 2A1–2A4 | Inputs for second 4-bit buffer group - enabled by 2OE; independent of first group's control. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Open-collector outputs for first group - require external pull-up for logic-high assertion; support wired-AND bus topology. |
| 3, 5, 7, 9 | 2Y1–2Y4 | Open-collector outputs for second group - electrically isolated from first group; enables dual-bus or redundant path driving. |
| 10 | GND | Ground reference for all inputs, outputs, and internal circuitry - must be low-impedance connection to minimize ground bounce. |
| 20 | VCC | +5-V supply - powers BiCMOS output stages and input buffers; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to 10 mA typical - cuts standby power in memory address drivers where outputs are frequently disabled. |
| Independent dual OE control | Allows interleaved or selective activation of two 4-bit channels - simplifies timing-critical bus arbitration without external logic. |
| Open-collector outputs | Enable direct wired-AND connection to shared data/address buses - eliminates need for external OR gates or level translators. |
| Power-up/power-down high-Z | Prevents bus contention during system initialization or shutdown - critical for hot-swap and fail-safe embedded designs. |
| Industrial temperature range | –40°C to +85°C operation - qualified for use in base stations, industrial PLCs, and automotive body control modules. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 20-bit address bus between microcontroller and SRAM/Flash memory in embedded instrumentation. IC Role / Device Role / Timing Role: Noninverting octal buffer providing fanout and noise margin; open-collector outputs allow shared bus with other peripherals. Use Value: Eliminates need for discrete pull-up resistors on address lines while maintaining <6 ns propagation delay for 20-MHz bus timing. | Use Scenario: Isolating and level-translating control signals between FPGA and legacy parallel EEPROM in test equipment. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control - enables FPGA to read/write EEPROM without bus contention. Use Value: Dual OE inputs permit precise timing control of data flow direction; 64 mA sink current drives EEPROM's write-enable line reliably. |
| Clock Distribution Network | Industrial I/O Expansion |
Use Scenario: Distributing buffered clock signal to multiple ASICs in telecom backplane with controlled edge rates. IC Role / Device Role / Timing Role: Low-skew buffer with open-collector outputs - used with single pull-up to reduce simultaneous switching noise. Use Value: tPHL/tPLH matching across channels minimizes clock skew; BiCMOS design limits ICCZ-induced supply ripple. | Use Scenario: Expanding GPIO count on programmable logic controller using 8-bit parallel I/O port with interrupt capability. IC Role / Device Role / Timing Role: Input latch and output driver for status/control lines - open-collector outputs interface directly to 24-V industrial sensors. Use Value: 0.55 V VOL at 64 mA ensures clean logic-low detection even with long cable runs and contact resistance. |
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 |
|---|---|---|---|
| SN74BCT757N | Dual-in-line ceramic package (300-mil), same electrical specs, higher thermal mass, no RoHS compliance. | Suitable for through-hole prototyping or legacy military/aerospace boards requiring ceramic DIP. | Choose SN74BCT757N only if board layout mandates DIP footprint or requires extended temperature validation beyond commercial grade. |
| SN64BCT757DWR | Same SOIC-20 DW package, tape-and-reel packaging (2000 pcs), active status, RoHS-compliant NIPDAU finish. | Drop-in replacement for SN64BCT757DW in volume SMT production; identical pinout and performance. | Select SN64BCT757DWR for new designs requiring active supply chain support and automated assembly compatibility. |
Compared with SN74BCT757N and SN64BCT757DWR, the SN64BCT757DW offers identical functionality in SOIC-20 but is marked obsolete; SN64BCT757DWR provides identical performance with active logistics support, while SN74BCT757N serves niche through-hole or ceramic-reliability needs.
Availability
SN64BCT757DW is available at Aetrix Electronics and suitable for memory address buffering, bus transceiver interfaces, and industrial I/O expansion requiring stable component supply and legacy-compatible SOIC-20 packaging.
Supply support for SN64BCT757DW 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 SN64BCT757DW belongs to TI's BCT logic family - engineered for high-speed, low-power bus interface applications where open-collector drive and power sequencing safety are essential.
FAQ
What is the operating temperature range for the SN64BCT757DW?
The SN64BCT757DW is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is confirmed in the absolute maximum ratings and recommended operating conditions sections of the official Texas Instruments datasheet SCBS479. The device maintains specified VOL, tPLH, and tPHL performance across this full span without derating.
Does the SN64BCT757DW have true 3-state outputs?
No, the SN64BCT757DW does not provide high-impedance (3-state) outputs. Its outputs are open-collector only - they can actively pull low or float high (requiring external pull-up). The high-impedance state occurs only during power-up/down transitions, not under normal logic control. This is explicitly stated in the functional description and confirmed by the absence of high-side drive circuitry in the logic diagram.
What is the maximum sink current per output on the SN64BCT757DW?
The SN64BCT757DW supports up to 64 mA DC sink current per output (IOL), as specified in the recommended operating conditions table. This value is validated at VCC = 4.5 V and TA = –40°C to +85°C. Exceeding this limit risks violating VOL specification (0.55 V max) or causing thermal stress in sustained operation.
Can the SN64BCT757DW be used with 3.3-V logic inputs?
Yes, the SN64BCT757DW accepts 3.3-V logic inputs safely: its VIH threshold is 2.0 V min and VIL is 0.8 V max, fully compatible with 3.3-V CMOS/TTL swing. However, it requires a 5-V supply (VCC = 4.5–5.5 V) and outputs are referenced to that rail - level translation must be handled externally if interfacing with 3.3-V receivers.
Is the SN64BCT757DW pin-compatible with the SN74LS757?
No, the SN64BCT757DW is not pin-compatible with the SN74LS757. While both are octal buffers with open-collector outputs, the SN74LS757 uses a different pinout (e.g., OE placement, Y/A assignment) and lacks complementary OE inputs. The SN64BCT757DW's unique 1OE/2OE dual-enable architecture and SOIC-20 layout do not match any 74LS-series DIP-20 variant.
SN64BCT757DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN64BCT757DW FAQ
1.How can I place an order for SN64BCT757DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT757DW 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 SN64BCT757DW reliable?
The price and inventory of SN64BCT757DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT757DW is usually 5 days.
3.What payment methods are accepted for SN64BCT757DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT757DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT757DW?
SN64BCT757DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT757DW 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 SN64BCT757DW?
For technical support, including SN64BCT757DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT757DW requirements.
6.How does Aetrix verify that SN64BCT757DW is sourced from the original manufacturer or authorized distributors?
All SN64BCT757DW 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 SN64BCT757DW meets industry standards.
7.What is the process for return or replacement of SN64BCT757DW?
All SN64BCT757DW units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT757DW, 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 SN64BCT757DW part is unused and in its original packaging.
Return procedure for SN64BCT757DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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