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Texas Instruments SN64BCT757DWR
- Part No.:
- SN64BCT757DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN64BCT757DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:358
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Product details
Overview
SN64BCT757DWR from Texas Instruments is an octal noninverting buffer/driver with open-collector outputs, designed for memory address and bus driving in 3-state systems. It features complementary output-enable inputs (1OE/2OE), operates from –40°C to 85°C, supports 5-V supply (4.5–5.5 V), delivers 64 mA sink current per output, and exhibits tPHL as low as 2.4 ns at 5 V.
For engineers reviewing the SN64BCT757DWR datasheet, SN64BCT757DWR pinout, SN64BCT757DWR application, or SN64BCT757DWR equivalent, key selection criteria include open-collector drive capability, high-impedance state during power sequencing, BiCMOS low ICCZ quiescent current, and SOIC-20 package compatibility with legacy bus architectures.
Technical Context
The SN64BCT757DWR implements dual 4-bit channels-each with independent active-low and active-high output-enable controls (1OE/2OE)-enabling flexible bus arbitration and staggered enable timing. Its BiCMOS process ensures fast switching (tPLH ≤ 9.6 ns, tPHL ≤ 6 ns) while maintaining low input capacitance (6 pF) and high noise immunity (VIH = 2 V, VIL = 0.8 V).
Open-collector outputs support wired-AND logic and bus termination via external pull-ups; the device enters high-impedance state during power-up/down (IOZ ≤ 50 µA at VCC ramp), preventing bus contention. Absolute max ratings include 7-V supply tolerance and 128-mA absolute output sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS bus systems and robust operation across supply variation. |
| IOL (per output) | 64 mA - Supports direct drive of multiple TTL loads or termination resistors on shared data/address buses. |
| tPHL / tPLH | 2.4 ns / 6.9 ns (min/max at 5 V) - Enables high-speed address buffering in memory subsystems with sub-10-ns timing budgets. |
| Input Clamp Current | –18 mA - Protects inputs against negative transients without external diodes in noisy industrial environments. |
| Power-Up IOZ | ≤50 µA - Guarantees safe high-Z state during VCC ramp, eliminating false bus writes or latch-up risk during cold start. |
| Operating Temp | –40°C to 85°C - Qualified for industrial-grade embedded control, instrumentation, and telecom infrastructure applications. |
Pinout & Package
SN64BCT757DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Complementary active-low output-enable controls - allow independent gating of two 4-bit output groups for time-multiplexed bus access. |
| 2, 4, 6, 8 | 1A1–1A4 | Noninverting input channels for first 4-bit group - accept address/data signals directly from microcontroller or FPGA I/O. |
| 11, 13, 15, 17 | 2A1–2A4 | Noninverting input channels for second 4-bit group - enable parallel or split-bus configuration with independent enable control. |
| 18, 16, 14, 12 | 1Y1–1Y4 | Open-collector outputs for first group - require external pull-up to define logic-high level and support wired-AND or bus arbitration. |
| 9, 7, 5, 3 | 2Y1–2Y4 | Open-collector outputs for second group - electrically isolated from first group, enabling dual-bus isolation or redundancy. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in high-current switching. |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 10 mm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ quiescent current significantly versus pure bipolar designs - critical for low-power standby in memory buffers. |
| High-impedance during power sequencing | IOZ ≤ 50 µA at VCC = 0–2.3 V - prevents bus conflicts during system boot or brownout recovery without external reset logic. |
| ESD protection | >2000 V HBM, >200 V machine model - eliminates need for external ESD protection in board-level I/O zones. |
| Complementary OE inputs | 1OE (active-low) and 2OE (active-high) per channel pair - simplifies interface with both active-low and active-high control logic (e.g., FPGA GPIO or ASIC enable signals). |
| Open-collector output architecture | Supports wired-AND logic, bus termination, level translation (with pull-up to different VCC), and multi-driver arbitration without external logic. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or EPROM chips in an industrial PLC backplane. IC Role / Device Role / Timing Role: Noninverting octal buffer providing fanout and voltage-level integrity between controller and memory devices, with open-collector outputs enabling shared bus arbitration. Use Value: Eliminates need for discrete transistor arrays or additional logic gates; 64 mA sink capability ensures reliable low-level assertion across long traces and multiple loads. | Use Scenario: Interfacing a DSP's data bus to external peripherals (ADC/DAC, FIFO) using a bidirectional data path with direction control. IC Role / Device Role / Timing Role: Unidirectional bus driver stage that conditions and isolates signals, leveraging open-collector outputs to support wired-OR handshaking protocols. Use Value: Enables clean signal edge integrity and controlled bus release timing; complementary OE inputs simplify synchronization with DSP READY/VALID strobes. |
| Clock Distribution Network | Legacy System Bus Expansion |
Use Scenario: Distributing a 25-MHz system clock to multiple synchronous logic blocks (CPLDs, counters) on a test equipment mainboard. IC Role / Device Role / Timing Role: Low-skew, noninverting clock buffer with open-collector outputs allowing series-terminated or parallel-terminated clock tree configurations. Use Value: Sub-10 ns propagation delay and 6 pF input capacitance minimize jitter accumulation and loading effects on the source clock generator. | Use Scenario: Adding ISA-compatible peripheral slots to a retro-computing motherboard using modern PCB fabrication. IC Role / Device Role / Timing Role: Pin-compatible replacement for obsolete 74LS/BCT-series octal drivers, supporting legacy 5-V TTL signaling levels and timing margins. Use Value: Maintains functional equivalence with original design intent while offering improved ESD robustness and power-up safety over older bipolar parts. |
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 DIP), same electrical specs, higher thermal mass, no tape-and-reel option. | Suitable for prototyping, through-hole assembly, or legacy repair where SOIC footprint is incompatible. | Select when manual soldering, socket-based testing, or mechanical ruggedness outweighs density and reflow compatibility requirements. |
| SN64BCT757DW | Same SOIC-20 package but marked as Obsolete in TI documentation; identical pinout and specs, no volume availability. | Not recommended for new designs due to discontinuation status and lack of long-term supply assurance. | Prefer SN64BCT757DWR for production use - it is Active, supplied in 2000-piece tape-and-reel, and qualified for industrial temperature range. |
Compared with SN74BCT757N and SN64BCT757DW, the SN64BCT757DWR offers optimal balance of modern SMT manufacturability, guaranteed industrial temperature operation, and active supply chain support - making it the preferred choice for volume production of bus-critical embedded systems.
Availability
SN64BCT757DWR is available at Aetrix Electronics and suitable for memory address buffering, bus transceiver interfaces, clock distribution networks, and legacy system bus expansion requiring stable component supply and industrial temperature qualification.
Supply support for SN64BCT757DWR 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 ICs for industrial, automotive, and communications markets.
The SN64BCT757DWR belongs to TI's BCT logic family - engineered for high-speed, low-noise 5-V bus interfacing with enhanced power-up safety and open-collector flexibility in memory and control subsystems.
FAQ
What is the function of the complementary OE inputs on the SN64BCT757DWR?
The SN64BCT757DWR features two output-enable inputs per 4-bit channel: 1OE (active-low) and 2OE (active-high). This allows flexible control from either active-low or active-high logic sources - for example, connecting 1OE to a microcontroller's active-low chip select and 2OE to an FPGA's active-high enable signal. Both must be asserted simultaneously to activate the corresponding outputs, ensuring deterministic bus control in mixed-signal systems.
Does the SN64BCT757DWR support 3.3-V input logic levels?
No, the SN64BCT757DWR is a 5-V-only device with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V). While 3.3-V logic may occasionally meet VIH under ideal conditions, it is not guaranteed across temperature and voltage tolerances. For reliable 3.3-V interfacing, level-shifting circuitry or a 3.3-V–tolerant buffer such as the SN74LVC8T245 is required alongside the SN64BCT757DWR.
Can the SN64BCT757DWR drive a 50-Ω transmission line directly?
No - the SN64BCT757DWR's open-collector outputs are not designed for direct 50-Ω line driving. Its 64-mA sink capability targets TTL fanout and bus termination, not RF impedance matching. For 50-Ω lines, use a dedicated line driver (e.g., SN65LVDS1) or add series termination and proper AC coupling. The SN64BCT757DWR should be used with pull-up resistors (e.g., 330 Ω to 5 V) for standard bus applications.
Is the SN64BCT757DWR pin-compatible with the 74LS757?
Yes - the SN64BCT757DWR is functionally and pin-compatible with the 74LS757 in the SOIC-20 (DW) package. Both share identical pin assignments, open-collector outputs, complementary OE structure, and 5-V operation. However, the SN64BCT757DWR improves upon the LS version with BiCMOS speed (sub-10 ns vs. ~25 ns), lower ICCZ, and enhanced ESD protection - making it a drop-in upgrade for performance-critical or reliability-sensitive designs.
What is the maximum capacitive load the SN64BCT757DWR can drive reliably?
The SN64BCT757DWR is characterized with CL = 50 pF for switching specifications (e.g., tPLH/tPHL). While it can drive higher capacitance, timing degrades predictably: at 100 pF, propagation delays increase by ~20–25%. For loads exceeding 75 pF, verify setup/hold margins in the target system. The SN64BCT757DWR's 64-mA sink strength supports moderate fanout, but heavy capacitive loads require careful layout and possibly local buffering.
SN64BCT757DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN64BCT757DWR FAQ
1.How can I place an order for SN64BCT757DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT757DWR 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 SN64BCT757DWR reliable?
The price and inventory of SN64BCT757DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT757DWR is usually 5 days.
3.What payment methods are accepted for SN64BCT757DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT757DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT757DWR?
SN64BCT757DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT757DWR 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 SN64BCT757DWR?
For technical support, including SN64BCT757DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT757DWR requirements.
6.How does Aetrix verify that SN64BCT757DWR is sourced from the original manufacturer or authorized distributors?
All SN64BCT757DWR 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 SN64BCT757DWR meets industry standards.
7.What is the process for return or replacement of SN64BCT757DWR?
All SN64BCT757DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT757DWR, 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 SN64BCT757DWR part is unused and in its original packaging.
Return procedure for SN64BCT757DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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