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Texas Instruments SN74BCT244DWR
- Part No.:
- SN74BCT244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT244DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
SN74BCT244DWR from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address and bus driving applications. It features two independent 4-bit channels, active-low output-enable (OE) control per channel, 5-V supply operation, ±64 mA low-level output drive, and 0°C to 70°C temperature range. Used in legacy industrial control backplanes and TTL-compatible data buses.
For engineers reviewing the SN74BCT244DWR datasheet, SN74BCT244DWR pinout, SN74BCT244DWR application, or SN74BCT244DWR equivalent, key selection factors include its BiCMOS output stage for reduced ICCZ, P-N-P input structure for low DC loading, ESD protection >2000 V, and SOIC-20 package compatibility with legacy 5-V logic systems.
Technical Context
The SN74BCT244DWR implements a dual 4-bit noninverting buffer architecture with separate 1OE and 2OE inputs enabling independent channel enable/disable control. Each channel passes A→Y when its OE is low; outputs enter high-impedance state when OE is high.
Its BiCMOS design combines bipolar input stages (P-N-P) for low input current and CMOS-like output drivers delivering TTL-compatible VOH ≥2.4 V at IOH = −12 mA and VOL ≤0.55 V at IOL = 64 mA, supporting direct interfacing with standard TTL loads without pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - operates reliably across full TTL-compatible 5-V rail tolerance. |
| Output Drive (IOL) | 64 mA - drives heavy capacitive bus loads or multiple TTL inputs without external buffers. |
| Propagation Delay | 0.9–5.0 ns (A→Y) - supports high-speed address/data buffering in 20–30 MHz bus systems. |
| Input Clamp Current | −18 mA - protects against transient overvoltage on address or control lines. |
| ICCZ (Quiescent) | 4–10 mA - significantly lower than bipolar-only equivalents, reducing system standby power. |
| ESD Protection | >2000 V (MIL-STD-883C) - withstands handling and board-level electrostatic discharge events. |
Pinout & Package
SN74BCT244DWR uses a 20-pin SOIC (DW) package, 7.5 mm wide, 2.65 mm max height, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - independently disable Channel 1 (pins 1A1–1A4 → 1Y1–1Y4) or Channel 2 (2A1–2A4 → 2Y1–2Y4). |
| 2–5, 13–16 | 1A1–1A4, 2A1–2A4 | Data inputs - accept TTL/CMOS logic levels; P-N-P input structure minimizes DC loading on upstream drivers. |
| 6–9, 11–14 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - drive bus lines directly; sink up to 64 mA while maintaining VOL ≤0.55 V. |
| 10 | GND | Ground reference - common return for all internal circuitry and output current paths. |
| 20 | VCC | Positive supply - powers both input and output stages; requires local 0.1 µF bypassing near pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Reduces ICCZ by >50% vs. legacy bipolar BCT devices, lowering system quiescent power in idle bus states. |
| P-N-P input structure | Limits IIH to 20 µA and IIL to −1 mA, minimizing loading on microcontroller port pins or clock generators. |
| 3-state bus interface capability | Enables bidirectional or shared-bus architectures via independent OE control-no external direction logic required. |
| TTL-compatible output voltage levels | VOH ≥2.4 V at −12 mA and VOL ≤0.55 V at 64 mA ensure robust noise margins when driving legacy TTL loads. |
Applications
| Memory Address Buffering | Industrial Backplane Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/ROM in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory module inputs; enables bus sharing with peripherals. Use Value: Delivers 64 mA sink current per output to meet TTL fan-out requirements without external transistors or level shifters. | Use Scenario: Interfacing ISA-style expansion slots in legacy test equipment where multiple cards share a common data/address bus. IC Role / Device Role / Timing Role: Bus driver with independent channel enables (1OE/2OE) allowing selective card activation without bus contention. Use Value: 0.9 ns min tPLH ensures timing compliance in 25 MHz synchronous backplane designs with 50 pF load. |
| Clock Distribution Network | Legacy System Bus Transceiver |
Use Scenario: Distributing buffered clock signals to multiple synchronous peripherals (e.g., ADCs, DACs) in measurement instruments. IC Role / Device Role / Timing Role: Low-skew, noninverting buffer with matched propagation delays across all 8 outputs. Use Value: tPLH/tPHL matching within 0.6 ns (typ) minimizes clock skew across parallel channels, preserving setup/hold timing. | Use Scenario: Bidirectional data bus isolation between Z80 CPU and peripheral I/O chips in retro-computing restoration projects. IC Role / Device Role / Timing Role: 3-state line driver acting as unidirectional data path under software-controlled OE assertion. Use Value: High-impedance state leakage (IOZH/IOZL ±50 µA) prevents signal corruption during bus arbitration cycles. |
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 | Bipolar TTL technology; higher ICCZ (30–50 mA), lower IOL (24 mA), slower propagation (15–25 ns). | Compatible with same 5-V bus but unsuitable for high-speed or low-power systems requiring <5 ns delay or <10 mA ICCZ. | Select SN74LS244N only if legacy board layout mandates identical pinout and speed/power trade-offs are acceptable. |
| SN74HC244PW | CMOS technology; rail-to-rail VOH/VOL, 74HC logic thresholds, 25 mA IOL, wider VCC range (2–6 V), no P-N-P inputs. | Requires level translation when interfacing with true TTL sources; not drop-in for systems relying on BCT's input current characteristics. | Choose SN74HC244PW for new 3.3/5-V mixed-signal designs where ultra-low ICC and wide supply range outweigh TTL compatibility needs. |
Compared with SN74LS244N, SN74BCT244DWR delivers 5× faster switching and 5× lower quiescent current; versus SN74HC244PW, it provides guaranteed TTL input compatibility and 2.6× higher sink drive-critical for legacy bus termination and fan-out.
Availability
SN74BCT244DWR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy instrumentation interfaces, and 5-V TTL bus expansion requiring stable component supply across extended production lifecycles.
Supply support for SN74BCT244DWR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT244DWR belongs to TI's legacy BCT (Bipolar-CMOS Transistor) logic family, engineered specifically to replace high-power 74LS devices in memory addressing and bus-driving roles while retaining pin compatibility and TTL electrical behavior.
FAQ
What is the operating temperature range of the SN74BCT244DWR?
The SN74BCT244DWR is characterized for operation from 0°C to 70°C, making it suitable for commercial and industrial indoor environments. This differs from the military-grade SN54BCT244, which operates from −55°C to 125°C. The SN74BCT244DWR's thermal specification aligns with standard plastic SOIC packaging and is validated per TI's recommended operating conditions in the SCBS006E datasheet.
Does the SN74BCT244DWR support hot insertion or live bus swapping?
The SN74BCT244DWR does not include explicit hot-swap protection circuitry. While its 3-state outputs and high-impedance disable mode reduce risk during insertion, the device lacks bus-hold, power-up 3-state, or Ioff (power-off protection) features. For live bus applications, external series resistors and careful sequencing of VCC and signal asserts are required. Always verify system-level robustness using the absolute maximum ratings: VO must remain within −0.5 V to 5.5 V in disabled state.
Can the SN74BCT244DWR drive a 50-pF bus capacitance at 25 MHz?
Yes-the SN74BCT244DWR's typical propagation delay is 2.5 ns (A→Y) and 5.7 ns (OE→Y) under 50-pF load conditions at 5 V and 25°C, supporting reliable operation in 25 MHz synchronous bus systems. Its 64 mA output drive ensures fast edge rates into capacitive loads, and the BiCMOS output stage maintains consistent VOH/VOL across process/voltage/temperature corners, preserving timing margins.
What is the pin 1 marking and orientation for SN74BCT244DWR tape-and-reel packaging?
The SN74BCT244DWR in SOIC-DW packaging uses quadrant Q1 pin 1 orientation in tape-and-reel format, per TI's PACKAGE MATERIALS INFORMATION documentation. The device marking "BCT244" appears on the top surface, and the carrier tape has sprocket holes aligned to deliver the part with pin 1 in the upper-left corner of each cavity when fed in standard orientation. Reel diameter is 330 mm, width 24.4 mm, and quantity 2000 units per reel.
Is the SN74BCT244DWR RoHS compliant and lead-free?
Yes-the SN74BCT244DWR is RoHS compliant with NiPdAu (nickel-palladium-gold) lead finish and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). It meets JEDEC J-STD-020 moisture sensitivity requirements and is qualified for lead-free reflow soldering at peak temperatures up to 260°C. TI's Package Option Addendum confirms RoHS status as "Yes" and lead finish as "NIPDAU" for this orderable part number.
SN74BCT244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- 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:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT244DWR FAQ
1.How can I place an order for SN74BCT244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT244DWR 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 SN74BCT244DWR reliable?
The price and inventory of SN74BCT244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT244DWR is usually 5 days.
3.What payment methods are accepted for SN74BCT244DWR?
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4.How is shipping managed for SN74BCT244DWR?
SN74BCT244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT244DWR 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 SN74BCT244DWR?
For technical support, including SN74BCT244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT244DWR requirements.
6.How does Aetrix verify that SN74BCT244DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT244DWR 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 SN74BCT244DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT244DWR?
All SN74BCT244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT244DWR, 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 SN74BCT244DWR part is unused and in its original packaging.
Return procedure for SN74BCT244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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