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Texas Instruments SN74BCT2827CNT
- Part No.:
- SN74BCT2827CNT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT2827CNT.pdf
- Description:
- IC BUF NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,048
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Product details
Overview
SN74BCT2827CNT from Texas Instruments is a 10-bit BiCMOS non-inverting buffer/driver with dual active-low 3-state enable inputs (OE1, OE2), designed specifically for driving MOS DRAM input capacitance. It features 25-Ω output impedance, 3.6 ns typical tPLH propagation delay at 5 V, and operates over 0°C to 70°C with 4.5–5.5 V supply. It is used in memory address buffering and wide-data-path bus interfacing.
For engineers reviewing the SN74BCT2827CNT datasheet, SN74BCT2827CNT pinout, SN74BCT2827CNT application, or SN74BCT2827CNT equivalent, key selection criteria include its flow-through pinout for PCB layout optimization, power-up high-impedance state, BiCMOS ICCZ reduction, and compatibility with 5-V TTL/CMOS logic systems requiring bus-driving capability without external termination resistors.
Technical Context
The SN74BCT2827CNT implements a dual-gated 3-state control architecture: both OE1 and OE2 must be low for outputs to drive; either high forces all ten Y outputs into high-impedance. Its BiCMOS design integrates bipolar pull-up and CMOS pull-down stages to achieve low ICCZ (3.8–6 mA) while sustaining 12 mA sink current per output.
Each output incorporates an internal 25-Ω series resistor, enabling direct connection to transmission lines or capacitive DRAM loads without external termination. The flow-through pinout (A1–A10 on one side, Y1–Y10 on the opposite) minimizes trace crossing and supports compact, noise-resilient PCB routing in memory subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS systems and stable operation across industrial voltage tolerances. |
| Propagation Delay (tPLH/tPHL) | 0.9–6.6 ns - Enables high-speed memory address or data bus buffering in sub-10 ns timing-critical paths. |
| Output Drive (IOL) | 12 mA sink per output - Sufficient to drive heavy capacitive loads of MOS DRAM address inputs without signal degradation. |
| Input/Output Capacitance (Ci/Co) | 5 pF / 8 pF - Low parasitic capacitance preserves signal integrity and reduces loading on upstream drivers. |
| Quiescent Current (ICCZ) | 3.8–6 mA - BiCMOS optimization cuts standby power vs. pure bipolar equivalents, critical for multi-device bus systems. |
| ESD Protection | >2000 V HBM - Meets MIL-STD-883C Method 3015, supporting robust handling in manufacturing and field environments. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded and computing applications where thermal margins are moderate. |
Pinout & Package
SN74BCT2827CNT is supplied in a 24-pin plastic DIP (NT package), with 300-mil body width and through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with standard DIP sockets and wave-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | OE1, OE2 | Active-low 3-state enable inputs - Dual gating ensures fail-safe high-Z during power sequencing or control faults. |
| 2–11 | A1–A10 | Non-inverting data inputs - Flow-through arrangement aligns inputs left-to-right matching physical board layout conventions. |
| 14–23 | Y1–Y10 | Buffered outputs with 25-Ω series resistance - Internally terminated to reduce ringing and simplify PCB routing to DRAM arrays. |
| 12 | GND | Ground reference - Dedicated low-inductance return path for all output drivers and internal logic. |
| 24 | VCC | Positive supply - Single 5-V rail powers both BiCMOS logic and output stages; no auxiliary supplies required. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ by >50% versus legacy bipolar BCT buffers, lowering system-level standby power in multi-driver buses. |
| Integrated 25-Ω output resistors | Eliminates need for 20 external series termination resistors in 10-bit memory address paths, saving board area and BOM cost. |
| Flow-through pinout (A1–A10 / Y1–Y10) | Enables straight-line PCB trace routing between controller and DRAM, minimizing crosstalk and stub length in high-speed layouts. |
| Power-up high-impedance state | Prevents bus contention during power ramp-up, removing requirement for external reset-synchronized OE control sequencing. |
| 2000-V HBM ESD rating | Supports direct handling and assembly without special ESD controls, reducing manufacturing overhead in contract electronics production. |
Applications
| DRAM Address Buffering | Wide Data Bus Interface |
|---|---|
Use Scenario: Driving 10-bit row/column address lines from a microprocessor or memory controller to multiple MOS DRAM chips on a single board. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing level translation, fanout expansion, and controlled bus release timing. Use Value: Internal 25-Ω termination and low tPHL (≤7.8 ns) ensure clean, monotonic address transitions meeting DRAM setup/hold windows without added components. |
Use Scenario: Interfacing a 10-bit peripheral data bus to a shared system data bus in an industrial controller with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Bidirectional-capable bus driver (via OE control) isolating subsystems and managing bus arbitration timing. Use Value: Dual OE inputs allow independent gating of two functional blocks; flow-through pinout simplifies routing across dense backplane traces. |
| Memory Expansion Module | Legacy System Bus Extender |
Use Scenario: Adding DRAM capacity to an older 80x86-based embedded system using ISA or proprietary memory expansion slots. IC Role / Device Role / Timing Role: Address latch interface buffer ensuring timing compliance between CPU address strobes and slower DRAM access cycles. Use Value: Guaranteed tPZH (≤10.7 ns) and tPLZ (≤10 ns) support reliable 8-MHz bus clocking with margin for aging components and temperature drift. |
Use Scenario: Upgrading a vintage test equipment mainframe with additional memory-mapped I/O cards requiring strict 5-V TTL-compatible signaling. IC Role / Device Role / Timing Role: Logic-level translator and bus load isolator maintaining signal integrity across long backplane runs. Use Value: Low Co (8 pF) and high noise immunity (VIH = 2 V, VIL = 0.8 V) prevent false triggering in electrically noisy rack-mounted environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT244N | Octal (8-bit), not 10-bit; identical BiCMOS process, 25-Ω outputs, same NT package footprint but 20-pin. | Lacks two address bits - unsuitable for full 10-bit DRAM row/column decoding; requires two devices for equivalent width. | Select only if system uses ≤8-bit addressing or allows cascaded octal buffers with added complexity. |
| SN74ACT244N | ACT-series CMOS; higher speed (tPLH = 2.5 ns typ), but no internal 25-Ω resistors and lower drive (24 mA sink). | Requires external series termination for DRAM loads; lacks power-up high-Z guarantee - may cause bus contention at startup. | Prefer for high-speed logic-only buses where termination is already implemented; avoid for direct DRAM interface without redesign. |
Compared with SN74BCT2827CNT, SN74BCT244N offers pin-compatible simplicity for narrower buses but mandates duplication for 10-bit width, while SN74ACT244N trades guaranteed DRAM drive capability for raw speed - making SN74BCT2827CNT the only single-package solution with integrated termination and fail-safe power sequencing for legacy memory subsystems.
Availability
SN74BCT2827CNT is available at Aetrix Electronics and suitable for DRAM address buffering, wide data bus interfacing, memory expansion modules, and legacy system bus extension requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT2827CNT 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 leader founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74BCT2827CNT belongs to TI's Bipolar-CMOS Transistor (BCT) logic family, engineered for high-speed, low-power memory interface applications where DRAM drive capability and bus isolation are critical.
FAQ
What is the function of the dual OE inputs on the SN74BCT2827CNT?
The SN74BCT2827CNT uses two active-low enable inputs (OE1 and OE2) wired to a 2-input AND gate. Both must be low for outputs to drive; if either is high, all ten Y outputs enter high-impedance. This provides redundant control for fault-tolerant bus arbitration and supports hierarchical enable schemes in multi-buffer systems. The SN74BCT2827CNT thus enables precise, fail-safe bus release without external logic.
Does the SN74BCT2827CNT require external termination resistors?
No. The SN74BCT2827CNT integrates 25-Ω series resistors on each output, explicitly designed to match typical PCB trace impedances and dampen reflections when driving capacitive DRAM loads. This eliminates the need for 20 discrete resistors in a 10-bit path, reducing BOM count, layout area, and signal integrity risk - a core feature confirmed in the SCBS007E datasheet.
What is the maximum operating temperature range for the SN74BCT2827CNT?
The SN74BCT2827CNT is characterized for operation from 0°C to 70°C, as specified in the "recommended operating conditions" table of the SCBS007E datasheet. This commercial-grade temperature range aligns with standard desktop, industrial control, and legacy computing environments - distinct from the −55°C to 125°C military-grade SN54BCT2827C variant.
Can the SN74BCT2827CNT be used with 3.3-V logic systems?
No. The SN74BCT2827CNT requires a 4.5–5.5 V supply and has TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V). Its outputs swing rail-to-rail within the 5-V domain and are not 3.3-V tolerant. Direct interfacing with 3.3-V systems risks overvoltage damage to receivers and violates recommended operating conditions - level-shifting circuitry is mandatory for such use cases.
Is the SN74BCT2827CNT pin-compatible with other 24-pin DIP logic buffers?
The SN74BCT2827CNT uses a unique flow-through pinout (A1–A10 on left, Y1–Y10 on right, OE1/OE2 at corners) optimized for memory bus layout. It is not pin-compatible with standard octal buffers like SN74LS244N or SN74HC244N due to differing pin counts, signal assignments, and dual-OE topology. Substitution requires PCB redesign - the SN74BCT2827CNT pinout is specific to its 10-bit DRAM interface role.
SN74BCT2827CNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 1mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74BCT2827CNT FAQ
1.How can I place an order for SN74BCT2827CNT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2827CNT 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 SN74BCT2827CNT reliable?
The price and inventory of SN74BCT2827CNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2827CNT is usually 5 days.
3.What payment methods are accepted for SN74BCT2827CNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT2827CNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT2827CNT?
SN74BCT2827CNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2827CNT 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 SN74BCT2827CNT?
For technical support, including SN74BCT2827CNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2827CNT requirements.
6.How does Aetrix verify that SN74BCT2827CNT is sourced from the original manufacturer or authorized distributors?
All SN74BCT2827CNT 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 SN74BCT2827CNT meets industry standards.
7.What is the process for return or replacement of SN74BCT2827CNT?
All SN74BCT2827CNT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2827CNT, 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 SN74BCT2827CNT part is unused and in its original packaging.
Return procedure for SN74BCT2827CNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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