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Texas Instruments SN74BCT2244DW
- Part No.:
- SN74BCT2244DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT2244DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,533
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Product details
Overview
SN74BCT2244DW from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in TTL- and MOS-compatible systems. It operates from 4.5 V to 5.5 V, features integrated 33-Ω series output resistors, supports ±12 mA drive capability, and delivers propagation delays as low as 0.5 ns (tPLH) at 5 V.
For engineers reviewing the SN74BCT2244DW datasheet, SN74BCT2244DW pinout, SN74BCT2244DW application, or SN74BCT2244DW equivalent, this device is selected for high-density 3-state bus interface applications requiring low overshoot, symmetrical enable control, and BiCMOS power efficiency in industrial and embedded computing systems.
Technical Context
The SN74BCT2244DW implements two independent 4-bit noninverting buffer sections, each controlled by a dedicated active-low output-enable (OE) input. Its BiCMOS architecture combines bipolar input stages for TTL compatibility and CMOS output stages with integrated 33-Ω series termination to suppress ringing without external components.
Each output is rated for 12 mA sink/source under load, with guaranteed VOH ≥ 2.0 V at IOH = −12 mA and VOL ≤ 0.8 V at IOL = 12 mA. The device exhibits ICCZ of only 6.5–10 mA in 3-state mode-significantly lower than earlier TTL drivers-enabling stable operation during bus contention or partial power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across standard 5-V logic rails with ±10% tolerance. |
| Output Drive | ±12 mA - Supports direct connection to terminated transmission lines or high-fanout TTL loads without external buffers. |
| Propagation Delay | 0.5–4.9 ns (tPLH/tPHL) - Enables timing-critical address/data bus buffering up to ~200 MHz effective data rates. |
| 3-State Enable Time | tPZH = 1.7–7.8 ns - Allows fast bus arbitration and dynamic signal routing in multiplexed architectures. |
| Input Thresholds | VIL ≤ 0.8 V, VVIH ≥ 2.0 V - Guarantees reliable recognition of standard TTL logic levels across temperature. |
| Output Series Resistor | 33 Ω (integrated) - Eliminates need for external source termination, reducing BOM count and PCB area in point-to-point bus designs. |
| ICCZ (3-State Current) | 6.5–10 mA - Minimizes standby power in large-scale backplane or memory subsystems with many idle drivers. |
Pinout & Package
SN74BCT2244DW is housed in a 20-pin SOIC (DW) package measuring 12.83 mm × 5.07 mm × 2.65 mm max height, RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Independent control of each 4-bit section; must be pulled high via resistor during power-up to ensure defined high-Z state. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | Eight buffered inputs accepting TTL-level signals; all unused inputs must be tied to VCC or GND per SCBA004. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting outputs | Eight outputs with integrated 33-Ω series resistance; capable of sourcing/sinking 12 mA while suppressing edge overshoot. |
| VCC (Pin 20) | Positive supply | Primary 4.5–5.5 V rail; decoupling capacitor required within 1 cm for stable switching performance. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and internal circuitry; shared with adjacent pins for low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines TTL-compatible input thresholds with CMOS output drive and low ICCZ, enabling mixed-logic interfacing without level shifters. |
| Integrated 33-Ω output series resistors | Eliminates external termination components, reduces signal reflections on short traces (<15 cm), and simplifies layout for dense PCBs. |
| Symmetrical active-low OE inputs | Enables independent gating of two 4-bit channels using standard open-collector or microcontroller GPIO signals without inverters. |
| Guaranteed 3-state isolation | IOZH/IOZL ≤ ±50 μA ensures minimal leakage into disabled buses, critical for hot-swap or multi-master system reliability. |
| High noise immunity | VIH = 2.0 V min and VIL = 0.8 V max provide >0.4 V noise margin against ground bounce or crosstalk in noisy industrial environments. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple SRAM or EPROM chips on a shared memory bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing fan-out expansion and bus isolation between CPU and memory devices. Use Value: Integrated 33-Ω resistors suppress address line ringing during fast transitions, preventing setup/hold violations at memory inputs. |
Use Scenario: Bidirectional data bus conditioning between a DSP and peripheral FIFO or ADC/DAC in a real-time signal processing system. IC Role / Device Role / Timing Role: Unidirectional line driver used in conjunction with complementary receivers to manage direction-controlled data flow. Use Value: Low propagation delay (≤4.9 ns) and tight tPLH/tPHL matching preserve data eye integrity across all eight bits. |
| Industrial Backplane Driver | Legacy System Bus Extender |
|
Use Scenario: Interfacing a modern controller module to legacy ISA or VMEbus peripherals requiring TTL-compatible drive strength and voltage levels. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer ensuring signal integrity over long backplane traces (>10 cm). Use Value: ±12 mA output drive sustains logic levels across 50-Ω characteristic impedance traces, eliminating need for discrete transistor arrays. |
Use Scenario: Upgrading aging industrial PLC I/O modules where original 74LS244 parts exhibit marginal timing margins or excessive power draw. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement delivering faster switching and lower ICCZ than LS-family predecessors. Use Value: 6.5–10 mA ICCZ reduces total system quiescent current by >40% versus equivalent LS devices, extending thermal headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Lower drive (±15 mA), higher ICCZ (30 mA), no integrated series resistors, slower tPLH (15 ns typical). | Requires external termination; suitable only for low-speed (<10 MHz), low-density boards with ample layout margin. | Select when cost sensitivity outweighs timing/power requirements and legacy LS compatibility is mandatory. |
| SN74LVC244APWR | 3.3-V only (1.65–3.6 V), ±24 mA drive, no integrated resistors, 3.3-V logic thresholds, smaller TSSOP package. | Not voltage-compatible with 5-V systems; requires level translation if interfacing with legacy 5-V peripherals. | Choose for new 3.3-V designs prioritizing density and drive strength, but avoid in mixed-voltage or 5-V-only environments. |
Compared with SN74LS244N, the SN74BCT2244DW offers 3× lower ICCZ and eliminates external termination; compared with SN74LVC244APWR, it maintains native 5-V operation and built-in signal integrity features essential for retrofitting legacy systems.
Availability
SN74BCT2244DW is available at Aetrix Electronics and suitable for memory subsystem design, industrial backplane interfacing, and legacy bus extension applications requiring stable component supply and long-term manufacturability.
Supply support for SN74BCT2244DW 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 for industrial, automotive, and communications markets.
The SN74BCT2244DW belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically to replace 74LS devices in high-performance 5-V memory and bus systems while delivering superior speed, drive, and power efficiency.
FAQ
What is the recommended power-up sequence for SN74BCT2244DW to avoid bus contention?
TI recommends tying both 1OE and 2OE to VCC through a pullup resistor (minimum value determined by driver sink capability) during power-up. This ensures all outputs remain in high-impedance until valid logic levels stabilize. For SN74BCT2244DW, a 4.7-kΩ resistor is commonly used. Failure to do so may cause undefined output states and transient bus conflicts before system initialization completes.
Does SN74BCT2244DW require external series resistors for EMI reduction?
No. The SN74BCT2244DW integrates 33-Ω series resistors on all eight outputs, explicitly designed to dampen edge overshoot and undershoot in point-to-point or lightly loaded bus configurations. External resistors are unnecessary unless driving long (>20 cm), unterminated transmission lines or meeting specific EMC test limits beyond the device's inherent suppression capability.
Can SN74BCT2244DW interface directly with 3.3-V logic inputs?
No. SN74BCT2244DW is a 5-V-only device with TTL-compatible input thresholds (VIL ≤ 0.8 V, VVIH ≥ 2.0 V). While its outputs swing rail-to-rail (0 V to 5 V), connecting them directly to 3.3-V CMOS inputs risks overvoltage damage or unreliable logic interpretation. A level-shifter or voltage translator is required for safe interoperability with 3.3-V systems.
What is the maximum capacitive load SN74BCT2244DW can drive while maintaining specified timing?
The SN74BCT2244DW's switching characteristics-including tPLH, tPHL, and enable/disable times-are characterized at CL = 50 pF. Exceeding this load increases propagation delay nonlinearly and may degrade edge monotonicity. For loads >50 pF, derating curves in the datasheet show tPLH rising to ~8 ns at 100 pF; layout optimization and local decoupling are advised to maintain timing margins.
Is SN74BCT2244DW suitable for hot-swap applications?
SN74BCT2244DW supports partial power sequencing but is not fully hot-swap rated. Its absolute maximum ratings allow VCC = −0.5 V to 7 V and VO = −0.5 V to 5.5 V in disabled states, enabling safe insertion into live backplanes *if* OE is held inactive (high) and all inputs are clamped. However, TI does not guarantee operation under dynamic insertion stress; dedicated hot-swap controllers are recommended for robust field-replaceable designs.
SN74BCT2244DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT2244DW FAQ
1.How can I place an order for SN74BCT2244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2244DW 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 SN74BCT2244DW reliable?
The price and inventory of SN74BCT2244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2244DW is usually 5 days.
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SN74BCT2244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2244DW 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 SN74BCT2244DW?
For technical support, including SN74BCT2244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2244DW requirements.
6.How does Aetrix verify that SN74BCT2244DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT2244DW 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 SN74BCT2244DW meets industry standards.
7.What is the process for return or replacement of SN74BCT2244DW?
All SN74BCT2244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2244DW, 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 SN74BCT2244DW part is unused and in its original packaging.
Return procedure for SN74BCT2244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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