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Texas Instruments SN74BCT244DBR
- Part No.:
- SN74BCT244DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74BCT244DBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,942
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Product details
Overview
SN74BCT244DBR from Texas Instruments is a noninverting octal buffer/line driver with 3-state outputs, designed for memory address and bus driving in 5-V TTL-compatible systems. It features two independent 4-bit sections, each with active-low output-enable (OE) control, 128-mA low-level output drive, 5.5-V absolute max supply voltage, and operation from 0°C to 70°C.
For engineers reviewing the SN74BCT244DBR datasheet, SN74BCT244DBR pinout, SN74BCT244DBR application, or SN74BCT244DBR equivalent, this page delivers verified electrical specs, package mapping to SOIC-20 (DB), functional timing behavior, real-world use cases in legacy bus interfacing, and validated alternative options for industrial control and retro-computing designs.
Technical Context
The SN74BCT244DBR uses BiCMOS technology to combine TTL input compatibility with CMOS output drive strength-enabling high fan-out while reducing ICCZ quiescent current. Its P-N-P input stage minimizes DC loading on upstream logic sources.
Each of its two 4-bit sections operates independently: when OE is low, A→Y data passes transparently; when OE is high, Y outputs enter high-impedance state. Propagation delays range from 0.9 ns to 5.5 ns (tPLH/tPHL) under 5-V/50-pF conditions, supporting reliable 100+ MHz bus toggling in legacy systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances in industrial and computing environments. |
| Output Drive (IOL) | 64 mA per output - supports direct connection to multiple TTL loads or long PCB traces without external buffering. |
| Propagation Delay | 0.9–5.5 ns (A→Y) - enables synchronization in high-speed address/data buses up to ~100 MHz in controlled-impedance layouts. |
| Input Compatibility | TTL-level VIH ≥ 2 V, VIL ≤ 0.8 V - interoperates seamlessly with legacy 74LS, 74ALS, and microprocessor address/data buses. |
| 3-State Enable Time | tPZL = 2–8.9 ns, tPHZ = 2–7.7 ns - guarantees fast bus release and acquisition critical for dynamic bus arbitration schemes. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, test equipment, and industrial controllers. |
| ESD Protection | >2000 V HBM - exceeds MIL-STD-883C Method 3015, enhancing robustness during handling and board insertion. |
Pinout & Package
SN74BCT244DBR is packaged in a 20-pin SOIC (Small-Outline Integrated Circuit) with 0.300-inch body width and 1.27-mm pitch - designated DB package per TI's drawing DW0020A. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Independent control of each 4-bit section; asserted low enables A→Y pass-through, high places Y outputs in high-Z. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | Eight buffered inputs accepting TTL-compatible logic levels; no inversion applied between A and Y. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting outputs | Eight high-drive outputs capable of sinking 64 mA each; tri-stated when corresponding OE is high. |
| VCC (Pin 20), GND (Pin 10) | Power supply terminals | Single 5-V supply only; decoupling capacitor required near Pin 20 to suppress switching noise on shared rails. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS architecture | Reduces ICCZ quiescent current to 4–10 mA vs. 23–80 mA in standard BCT, lowering system power in idle bus states. |
| P-N-P input stage | Minimizes input DC loading (IIL = −1 mA max), preventing signal degradation when driving multiple SN74BCT244DBR inputs from one source. |
| High-current 3-state outputs | 64-mA sink capability per output allows direct termination of unterminated bus stubs or driving of multiple TTL inputs without pull-up resistors. |
| Fast enable/disable timing | tPZL/tPHZ ≤ 8.9 ns ensures minimal bus contention window during output transitions-critical for multi-master arbitration. |
| MIL-STD-883C ESD rating | Exceeds 2000 V HBM, enabling safe manual handling and integration into field-serviceable equipment without extra protection circuitry. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microprocessor (e.g., 8086/80286) to multiple memory ICs on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory decode logic and DRAM address latches. Use Value: 64-mA drive strength eliminates need for additional line drivers; fast tPLH/tPHL ensures setup/hold compliance with 80 ns–120 ns memory access cycles. |
Use Scenario: Interfacing ISA-bus peripherals requiring bidirectional data flow with unidirectional buffers. IC Role / Device Role / Timing Role: Unidirectional bus driver enabling CPU-to-peripheral data transfer, paired with complementary SN74BCT240 for reverse direction. Use Value: Independent OE pins allow precise timing control over data launch windows, avoiding bus contention during read-modify-write sequences. |
| Industrial I/O Expansion | Retrocomputing System Board |
|
Use Scenario: Expanding parallel I/O on PLC backplanes where microcontroller GPIOs must drive multiple optocouplers or relay drivers. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between 3.3-V/5-V MCU ports and 5-V industrial loads. Use Value: TTL-compatible inputs accept 3.3-V logic highs via margin (VIH = 2 V min); 64-mA sink drives LED indicators or base inputs of discrete NPN switches directly. |
Use Scenario: Replacing obsolete 74LS244 in vintage computer motherboard repairs (e.g., IBM PC/XT clones, early arcade boards). IC Role / Device Role / Timing Role: Drop-in compatible address/data buffer maintaining original timing margins and load drive capability. Use Value: Identical pinout and function to 74LS244 but with higher drive and lower ICCZ-extends system reliability without PCB modification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Lower output drive (24 mA), higher ICC (48 mA typical), slower propagation (15–25 ns), same SOIC-20 pinout. | Acceptable for low-speed, low-fanout legacy systems; insufficient for driving long traces or multiple TTL loads simultaneously. | Select SN74LS244N only if strict LS-family timing compliance is required and drive demand is ≤24 mA per line. |
| SN74ACT244NSR | CMOS input (VIH = 3.5 V), 24-mA output drive, faster tPLH/tPHL (2.5–5.5 ns), 4.5–5.5 V supply, same SOP-20 footprint. | Better noise immunity and speed, but incompatible with TTL-level inputs unless level-shifted; unsuitable for direct replacement in 74BCT/LS systems. | Choose SN74ACT244NSR for new designs needing lower power and higher speed, provided input logic levels are CMOS-compatible. |
Compared with SN74LS244N, SN74BCT244DBR delivers 2.7× higher output current and 40% lower propagation delay-enabling robust bus driving in dense layouts. Against SN74ACT244NSR, it retains full TTL input compatibility at the cost of higher static current, making it the preferred choice for drop-in upgrades of legacy 5-V systems.
Availability
SN74BCT244DBR is available at Aetrix Electronics and suitable for industrial control panels, retrocomputing restoration projects, and legacy test equipment requiring stable component supply with long-term lifecycle support.
Supply support for SN74BCT244DBR 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 leader founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT244DBR belongs to TI's Bipolar-CMOS Transistor (BCT) logic family-designed specifically to bridge performance gaps between TTL and CMOS by combining TTL input thresholds with high-current BiCMOS outputs for bus interface applications.
FAQ
What is the maximum output current per pin for SN74BCT244DBR?
The SN74BCT244DBR supports up to 64 mA of low-level output current (IOL) per Y pin under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This value is specified in the electrical characteristics table of the SCBS006E datasheet and enables direct driving of multiple TTL loads or moderate-length PCB traces without external amplification. Exceeding this limit risks thermal overstress or parameter shift.
Is SN74BCT244DBR pin-compatible with SN74LS244?
Yes, SN74BCT244DBR is pin-compatible with SN74LS244 in SOIC-20 (DB) and PDIP-20 packages, sharing identical pin numbering, function assignment, and 20-pin layout. However, SN74BCT244DBR offers higher output drive (64 mA vs. 24 mA), faster propagation (0.9–5.5 ns vs. 15–25 ns), and lower quiescent current-making it a functional upgrade without PCB changes.
Does SN74BCT244DBR support 3.3-V input logic levels?
No, SN74BCT244DBR does not reliably recognize 3.3-V logic-high inputs. Its TTL-compatible input threshold requires VIH ≥ 2.0 V (min), but 3.3-V CMOS outputs may fall below guaranteed switching margins under capacitive loading or temperature variation. For mixed-voltage systems, use a level translator or select an ACT/HC-series buffer with explicit 3.3-V input support instead of relying on SN74BCT244DBR.
What is the operating temperature range of SN74BCT244DBR?
The SN74BCT244DBR is characterized for commercial operation from 0°C to 70°C, as confirmed in the "recommended operating conditions" table of the SCBS006E datasheet. This distinguishes it from the military-grade SN54BCT244 (−55°C to 125°C) and confirms its suitability for indoor industrial controls, desktop computing peripherals, and laboratory instrumentation-not extended-temperature outdoor or automotive applications.
Can SN74BCT244DBR be used in place of SN74BCT240?
No, SN74BCT244DBR cannot substitute for SN74BCT240 because they differ in logic function: SN74BCT244DBR provides eight noninverting buffers (A→Y), while SN74BCT240 offers four inverting and four noninverting buffers (A→Y with polarity split). Their pinouts are also incompatible-SN74BCT240 uses different OE placement and output ordering. Use SN74BCT244DBR only where uniform noninverting buffering is required.
SN74BCT244DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SSOP
SN74BCT244DBR FAQ
1.How can I place an order for SN74BCT244DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT244DBR 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 SN74BCT244DBR reliable?
The price and inventory of SN74BCT244DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT244DBR is usually 5 days.
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Once your SN74BCT244DBR 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 SN74BCT244DBR?
For technical support, including SN74BCT244DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT244DBR requirements.
6.How does Aetrix verify that SN74BCT244DBR is sourced from the original manufacturer or authorized distributors?
All SN74BCT244DBR 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 SN74BCT244DBR meets industry standards.
7.What is the process for return or replacement of SN74BCT244DBR?
All SN74BCT244DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT244DBR, 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 SN74BCT244DBR part is unused and in its original packaging.
Return procedure for SN74BCT244DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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