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Texas Instruments SN74BCT244NSR
- Part No.:
- SN74BCT244NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74BCT244NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,893
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Product details
Overview
SN74BCT244NSR 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 sections with active-low output-enable (OE) inputs, 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 SN74BCT244NSR datasheet, SN74BCT244NSR pinout, SN74BCT244NSR application, or SN74BCT244NSR equivalent, key selection criteria include 3-state bus-driving capability, BiCMOS output stage performance, SOIC-20 package compatibility, and legacy TTL-level interface requirements.
Technical Context
The SN74BCT244NSR implements a dual 4-bit noninverting buffer architecture with separate 1OE and 2OE controls, enabling independent enablement of each 4-bit channel. Its BiCMOS output stage combines bipolar pull-up and MOS pull-down transistors to achieve high-speed switching (tPLH/tPHL ≤ 5 ns) while reducing quiescent current (ICCZ ≤ 10 mA).
Input structure uses P-N-P transistors to minimize DC loading on driving sources, and ESD protection exceeds 2000 V per MIL-STD-883C Method 3015. The device operates strictly within 4.5 V–5.5 V supply range and requires no external biasing or termination for standard TTL bus interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL and CMOS systems without level-shifting. |
| Output Drive (IOL) | 64 mA - Sustains robust fan-out to ≥20 standard TTL loads on shared bus lines. |
| Propagation Delay | ≤5 ns (A→Y, VCC=5 V, CL=50 pF) - Supports bus clock rates up to ~100 MHz in short-line configurations. |
| Quiescent Current (ICCZ) | ≤10 mA - Minimizes standby power in 3-state disabled mode, critical for multi-driver bus architectures. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded control and instrumentation environments. |
| ESD Protection | >2000 V HBM - Meets MIL-STD-883C for handling robustness in manual assembly and field service. |
| Logic Family | BCT (BiCMOS TTL-compatible) - Provides TTL input thresholds (VIL=0.8 V, VIH=2.0 V) and output voltage levels compatible with 74LS/74ALS. |
Pinout & Package
SOP-20 (NS) package: 20-pin small-outline plastic package with 0.65 mm lead pitch, 7.6 mm body width, and 13.0 mm length; RoHS-compliant NiPdAu lead finish; MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 and Channel 2 - Asserting either disables its four outputs to high-impedance state. |
| 2–5, 13–16 | 1A1–1A4, 2A1–2A4 | Noninverting input terminals - Directly accept TTL-level signals; P-N-P input structure reduces source loading. |
| 6–9, 11–14 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - Deliver rail-to-rail logic levels with ±64 mA sink/source capability into bus loads. |
| 10 | GND | Ground reference - Shared return path for all internal circuitry and output drivers. |
| 20 | VCC | Positive supply - Must be decoupled locally (0.1 µF ceramic) due to BiCMOS transient current demands. |
Key Features
| Feature | Design Value |
|---|---|
| State-of-the-art BiCMOS design | Reduces ICCZ by >50% versus equivalent bipolar TTL buffers, lowering system power in idle bus states. |
| P-N-P input structure | Limits input current to ≤1 mA at VI = 0.5 V, preventing excessive loading on upstream TTL or CMOS drivers. |
| 3-state bus-driving capability | Enables time-multiplexed sharing of single data/address bus among multiple SN74BCT244NSR devices without contention. |
| High-current output stage | Delivers 64 mA sink current per output - sufficient to drive terminated 50 Ω transmission lines or 20+ TTL inputs simultaneously. |
| MIL-STD-883C ESD rating | Exceeds 2000 V HBM - eliminates need for external ESD protection diodes in board-level designs. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from microcontroller to multiple SRAM/ROM chips on a shared memory bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory chip inputs; enables address decoding and chip-select gating. Use Value: Prevents bus contention during DMA cycles; 5 ns propagation delay ensures setup/hold timing margins are maintained at 8 MHz bus clocks. | Use Scenario: Interfacing ISA-style peripheral cards with a host controller using unidirectional data/address buses. IC Role / Device Role / Timing Role: Unidirectional line driver translating controller-side TTL signals to backplane bus segments with controlled edge rates. Use Value: 64 mA drive strength maintains signal integrity across 15 cm daisy-chained traces; BiCMOS output reduces ground bounce vs. pure bipolar alternatives. |
| Industrial I/O Expansion Module | TTL-Level Logic Level Translation |
Use Scenario: Isolating PLC CPU outputs from relay driver banks via optocoupler inputs requiring clean, high-drive digital signals. IC Role / Device Role / Timing Role: Output buffer amplifying weak microcontroller GPIOs to drive optocoupler LEDs with consistent turn-on current. Use Value: Guaranteed VOH ≥2.4 V at IOL = 64 mA ensures reliable LED activation across temperature; 3-state allows dynamic reconfiguration of I/O mapping. | Use Scenario: Bridging 3.3 V FPGA I/O banks to legacy 5 V TTL peripherals where level shifters are unavailable. IC Role / Device Role / Timing Role: Input-tolerant buffer accepting 3.3 V logic highs (VIH = 2.0 V min) and outputting full 5 V TTL levels to downstream receivers. Use Value: Eliminates need for discrete level-shifting resistors; P-N-P inputs tolerate 3.3 V drive without clamping diode conduction or excessive leakage. |
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 design; higher ICCZ (30 mA), slower tPLH (15 ns), lower IOL (24 mA). | Compatible pinout but reduced drive and speed; suitable only for low-frequency, low-fanout legacy systems. | Select when cost sensitivity outweighs performance; avoid in new designs requiring <10 ns timing or >40 mA drive. |
| SN74LVC244APWR | Low-voltage CMOS; supports 1.65–3.6 V VCC; 3.3 V logic levels; 24 mA IOL; 3.3 V tolerant inputs. | Not pin-compatible; requires level-shifting for 5 V bus use; optimized for modern low-power MCU interfaces. | Choose for battery-powered or mixed-voltage systems; not a drop-in replacement for SN74BCT244NSR in 5 V-only designs. |
Compared with SN74LS244N, SN74BCT244NSR delivers 3× faster switching and 3× higher drive with 65% lower standby current; versus SN74LVC244APWR, it provides native 5 V operation and bus-driving strength but lacks voltage flexibility and modern packaging density.
Availability
SN74BCT244NSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test equipment interfaces, and 5 V TTL bus expansion modules requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT244NSR 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 SN74BCT244NSR belongs to TI's legacy BCT logic family, engineered specifically to replace 74LS devices with improved speed, drive strength, and power efficiency in 5 V bus-oriented systems.
FAQ
What is the maximum output current specification for SN74BCT244NSR?
The SN74BCT244NSR specifies a low-level output current (IOL) of 64 mA per output under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating ensures reliable drive into heavy TTL loads or moderately terminated transmission lines without violating VOL limits (≤0.55 V). Exceeding this current may cause output voltage degradation or thermal stress.
Does SN74BCT244NSR support 3.3 V input logic levels?
Yes, SN74BCT244NSR accepts 3.3 V as a valid high-level input (VIH ≥ 2.0 V) due to its TTL-compatible input threshold. Inputs are rated for VI up to 7 V, allowing safe interfacing with 3.3 V microcontrollers or FPGAs without external level shifting-provided the 5 V VCC supply is present and stable.
What package type does SN74BCT244NSR use, and is it RoHS compliant?
SN74BCT244NSR uses the SOP-20 (NS) package: a 20-pin small-outline plastic package with 0.65 mm lead pitch. It is RoHS compliant with NiPdAu lead finish and MSL Level-1 rating (unlimited floor life), making it suitable for lead-free reflow processes per J-STD-020.
Can SN74BCT244NSR be used in place of SN74LS244 in existing designs?
Yes, SN74BCT244NSR is pin-compatible and functionally equivalent to SN74LS244, with identical pinout, logic behavior, and 5 V operation. However, SN74BCT244NSR offers superior performance: 3× faster propagation delay, 2.7× higher output drive, and 65% lower quiescent current-enabling direct replacement with measurable system-level improvements.
What is the purpose of the two separate OE inputs on SN74BCT244NSR?
The SN74BCT244NSR features two independent active-low output-enable inputs (1OE and 2OE) to control its two 4-bit channels separately. This allows selective 3-state disabling of Channel 1 (pins 1A1–1A4 → 1Y1–1Y4) or Channel 2 (2A1–2A4 → 2Y1–2Y4), enabling flexible bus arbitration, partial bus isolation, or staggered enable sequencing in multi-buffer systems.
SN74BCT244NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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-SO
SN74BCT244NSR FAQ
1.How can I place an order for SN74BCT244NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT244NSR 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 SN74BCT244NSR reliable?
The price and inventory of SN74BCT244NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT244NSR is usually 5 days.
3.What payment methods are accepted for SN74BCT244NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT244NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT244NSR?
SN74BCT244NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT244NSR 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 SN74BCT244NSR?
For technical support, including SN74BCT244NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT244NSR requirements.
6.How does Aetrix verify that SN74BCT244NSR is sourced from the original manufacturer or authorized distributors?
All SN74BCT244NSR 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 SN74BCT244NSR meets industry standards.
7.What is the process for return or replacement of SN74BCT244NSR?
All SN74BCT244NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT244NSR, 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 SN74BCT244NSR part is unused and in its original packaging.
Return procedure for SN74BCT244NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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