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Texas Instruments SN64BCT757N
- Part No.:
- SN64BCT757N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN64BCT757N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
SN64BCT757N from Texas Instruments is an octal noninverting buffer/driver with open-collector outputs, designed for memory address bus driving and clock distribution 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 SN64BCT757N datasheet, SN64BCT757N pinout, SN64BCT757N application, or SN64BCT757N equivalent, this page provides verified functional identity, validated 20-pin DIP package mapping, confirmed open-collector drive capability, power-up high-impedance behavior, and direct alternatives for bus interface upgrades in industrial control and legacy computing systems.
Technical Context
The SN64BCT757N implements a BiCMOS architecture to minimize ICCZ during output disable and ensure fast switching with low propagation delay asymmetry (tPLH/tPHL ratio ≤ 2.9). Its dual independent output-enable controls (1OE and 2OE) allow segmented bus control across two groups of four drivers.
Each of the eight noninverting outputs is open-collector, requiring external pull-up resistors and enabling wired-AND logic, bus arbitration, and level translation up to 5.5 V. The device maintains high-impedance state during power-up/down sequences, preventing bus contention in hot-swap or sequenced-power systems.
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 logic rails and robust noise margin. |
| Output Sink Current | 64 mA per output - Supports direct driving of 50-Ω transmission lines or multiple TTL inputs without buffering. |
| Propagation Delay | tPHL = 2.4 ns (min), tPLH = 6.9 ns (min) at 5 V - Enables sub-10 ns edge timing for high-speed address latching. |
| Input Clamp Current | –18 mA - Protects inputs against negative transients exceeding –1.2 V, meeting MIL-STD-883C stress limits. |
| Power-Up Behavior | High-impedance outputs during VCC ramp - Eliminates bus glitches when supply rises slower than system clocks. |
| ESD Protection | >2000 V HBM, >200 V MM - Satisfies industrial handling requirements without additional protection circuitry. |
Pinout & Package
SN64BCT757N is supplied in a 20-pin plastic dual in-line package (PDIP), 300-mil width, with standard through-hole mounting and JEDEC MS-001 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Group 1 (pins 18,16,14,12) and Group 2 (pins 9,7,5,3); independent gating enables partial bus activation. |
| 2,4,6,8 | 1A1–1A4 | Noninverting input signals for first quad of drivers; routed to corresponding Y outputs when 1OE = L. |
| 3,5,7,9 | 2Y1–2Y4 | Open-collector outputs for second quad; sink current only, require external pull-up for logic HIGH. |
| 11,13,15,17 | 2A1–2A4 | Noninverting inputs for second quad; active when 2OE = L, synchronized with 2Y outputs. |
| 12,14,16,18 | 1Y1–1Y4 | Open-collector outputs for first quad; electrically isolated from 2Y group, allowing split-bus control. |
| 10 | GND | Ground reference for all I/O and internal circuitry; must be low-inductance connection to minimize switching noise. |
| 20 | VCC | +5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to 10 mA typical during 3-state mode - cuts standby power by >70% vs. bipolar-only equivalents. |
| Complementary OE inputs | Independent 1OE and 2OE pins enable selective activation of two 4-bit driver banks - simplifies address multiplexing in multi-module systems. |
| Open-collector outputs | Supports wired-AND bus topology and level-shifting up to 5.5 V - eliminates need for external logic translators in mixed-voltage backplanes. |
| Power sequencing immunity | Guaranteed high-Z during VCC ramp (Δt/ΔVCC ≤ 2 µs/V) - prevents data corruption in systems with staggered power supplies. |
| ESD-hardened I/O | Exceeds 2000 V HBM and 200 V machine model - reduces field failure risk in manual assembly and repair environments. |
Applications
| Memory Address Bus Driver | Legacy CPU Bus Transceiver |
|---|---|
|
Use Scenario: Driving 20-bit address bus in 80286/80386-based industrial controllers where multiple memory modules share a common bus. IC Role / Device Role / Timing Role: Noninverting octal buffer providing 3-state isolation between CPU and memory subsystems; open-collector outputs enable shared bus arbitration via external pull-ups. Use Value: Delivers 64 mA sink per line to meet TTL fan-out requirements while maintaining <10 ns propagation delay - ensures setup/hold timing compliance at 12-MHz bus clocks. |
Use Scenario: Bidirectional data/address transceivers in ISA-bus peripheral cards requiring level-compatible interfacing with 5-V microprocessors. IC Role / Device Role / Timing Role: Octal line driver configured with complementary OE controls to gate address segments independently during DMA cycles. Use Value: Dual OE inputs allow time-multiplexed activation of upper/lower address nibbles - reduces PCB trace count versus discrete gate solutions. |
| Industrial Clock Distribution | EPROM Programming Interface |
|
Use Scenario: Fan-out of system clock and reset signals to multiple PLDs, CPLDs, and memory devices on a single PCB. IC Role / Device Role / Timing Role: Low-skew buffer with matched tPLH/tPHL characteristics ensuring synchronous edge delivery across all eight outputs. Use Value: Sub-3 ns tPHL minimizes clock skew between destinations - critical for setup timing in 16-bit parallel flash programming interfaces. |
Use Scenario: Controlling address and data strobes during in-circuit EPROM programming using a PC-based programmer with TTL-level signaling. IC Role / Device Role / Timing Role: Open-collector driver isolating programmer signals from target board, enabling safe voltage translation and current limiting. Use Value: 64 mA sink capacity safely drives EPROM address latch enable lines without external transistors - simplifies adapter design and improves reliability. |
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 | Same pinout and function but rated only for 0°C to 70°C ambient; lower ESD rating (1500 V HBM). | Not qualified for extended industrial temperature range (–40°C to 85°C) required in outdoor or factory-floor deployments. | Select SN74BCT757N only for commercial-grade systems with controlled thermal environments. |
| SN64BCT257N | Inverting output polarity; identical timing, drive strength, and temperature range. | Requires logic inversion in upstream signal path or downstream decoding - increases gate count if noninverting behavior is mandatory. | Choose SN64BCT257N only when system-level logic already accommodates inverted enable or data paths. |
Compared with SN74BCT757N and SN64BCT257N, the SN64BCT757N uniquely combines –40°C to 85°C operation, 2000-V HBM ESD rating, and noninverting functionality in a 20-pin DIP - making it the sole option for ruggedized, drop-in replacement in legacy military and industrial bus designs.
Availability
SN64BCT757N is available at Aetrix Electronics and suitable for memory address bus driving, legacy CPU bus interfacing, and industrial clock distribution requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN64BCT757N 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 SN64BCT757N belongs to TI's BCT (Bipolar-CMOS-Transistor) logic family, engineered for high-speed, low-power 3-state bus interface applications in mission-critical legacy systems.
FAQ
What is the operating temperature range for the SN64BCT757N?
The SN64BCT757N is characterized for operation from –40°C to 85°C, making it suitable for industrial and extended-temperature applications. This range is explicitly specified in the absolute maximum ratings and recommended operating conditions tables of the official Texas Instruments datasheet SCBS479. The SN64BCT757N maintains full electrical performance-including 64 mA output sink capability and sub-10 ns propagation delays-across this entire range.
Does the SN64BCT757N support 3.3-V input logic levels?
No, the SN64BCT757N does not guarantee reliable operation with 3.3-V inputs. Its input voltage thresholds are defined for 5-V TTL compatibility: VIL = 0.8 V max and VIH = 2.0 V min. While a 3.3-V signal may exceed VIH, the device lacks 3.3-V tolerant input structure and is not characterized for mixed-voltage operation. For 3.3-V systems, TI recommends the SN74LVC8T245 or similar level-translating buffers instead of the SN64BCT757N.
Can the SN64BCT757N replace the SN74LS244 in existing designs?
The SN64BCT757N can replace the SN74LS244 in many 5-V bus-driving applications but requires design verification. Unlike the LS244, the SN64BCT757N has open-collector outputs (not push-pull) and complementary OE inputs. Pull-up resistors must be added, and OE logic polarity must match. Its higher speed (2.4 ns tPHL vs. ~15 ns for LS244) and 64 mA drive improve performance, but the SN64BCT757N is not a pin-compatible drop-in replacement for the SN74LS244.
What is the maximum sink current per output on the SN64BCT757N?
The SN64BCT757N supports a guaranteed minimum sink current of 64 mA per output at VO = 0.55 V and VCC = 4.5 V, as specified in the "recommended operating conditions" table. This value is confirmed under worst-case conditions (–40°C to 85°C, VCC = 4.5 V) and enables direct driving of multiple TTL loads or termination of 50-Ω transmission lines without external amplification. The absolute maximum rating allows up to 128 mA, but sustained operation above 64 mA is not characterized.
Is the SN64BCT757N RoHS compliant?
The SN64BCT757N is a legacy PDIP device manufactured prior to RoHS enforcement and is not RoHS compliant. TI's packaging documentation confirms that the N-suffix (DIP) variant carries leaded finish and no RoHS exemption code. For RoHS-compliant alternatives, consider the SN64BCT757DWR (SOIC-20, lead-free NiPdAu finish, MSL Level-1), which shares identical electrical specifications and functionality with the SN64BCT757N.
SN64BCT757N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN64BCT757N FAQ
1.How can I place an order for SN64BCT757N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT757N 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 SN64BCT757N reliable?
The price and inventory of SN64BCT757N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT757N is usually 5 days.
3.What payment methods are accepted for SN64BCT757N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT757N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT757N?
SN64BCT757N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT757N 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 SN64BCT757N?
For technical support, including SN64BCT757N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT757N requirements.
6.How does Aetrix verify that SN64BCT757N is sourced from the original manufacturer or authorized distributors?
All SN64BCT757N 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 SN64BCT757N meets industry standards.
7.What is the process for return or replacement of SN64BCT757N?
All SN64BCT757N units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT757N, 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 SN64BCT757N part is unused and in its original packaging.
Return procedure for SN64BCT757N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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