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Texas Instruments SN74BCT244NG4
- Part No.:
- SN74BCT244NG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT244NG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,396
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Product details
Overview
SN74BCT244NG4 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, 128-mA low-level output drive capability, and propagation delays as low as 0.9 ns (tPLH) at 5 V. It is used in legacy industrial control backplanes and TTL-compatible data bus interfaces.
For engineers reviewing the SN74BCT244NG4 datasheet, SN74BCT244NG4 pinout, SN74BCT244NG4 application, or SN74BCT244NG4 equivalent, key selection criteria include its BiCMOS output stage for reduced ICCZ, P-N-P input structure for low DC loading, ESD protection >2000 V, and compatibility with standard 5-V TTL logic families in memory and address buffering roles.
Technical Context
The SN74BCT244NG4 implements a dual 4-bit noninverting buffer architecture with separate OE\ controls per section, enabling selective bus isolation. Its BiCMOS output stage combines bipolar pull-down transistors (for high sink current: 128 mA) and CMOS pull-up circuitry (for low ICCZ: 4–10 mA), delivering TTL-compatible voltage levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V) while minimizing quiescent power.
Input structure uses P-N-P transistors to reduce DC loading on upstream drivers, and all inputs tolerate 0–7 V regardless of VCC. The device operates strictly within 0°C to 70°C and requires VCC = 4.5–5.5 V; it does not support 3.3-V operation or hot-swap functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Must be regulated 5-V rail; no 3.3-V tolerance. |
| Output Drive (IOL) | 128 mA - Enables direct driving of multiple TTL loads or unterminated transmission lines. |
| Propagation Delay | 0.9 ns (min tPLH) - Supports high-speed address/data bus timing in legacy microprocessor systems. |
| Quiescent Current (ICCZ) | 4–10 mA - Significantly lower than bipolar-only equivalents, reducing system power in standby. |
| ESD Protection | >2000 V (MIL-STD-883C) - Robust handling during board assembly and field service. |
| Operating Temperature | 0°C to 70°C - Commercial-grade rating; not suitable for extended industrial or automotive environments. |
| Input Clamp Current | −18 mA - Limits damage from transient overvoltage at inputs without external clamps. |
Pinout & Package
SN74BCT244NG4 is supplied in a 20-pin plastic DIP (PDIP) package (package code N), 300-mil width, through-hole mountable. Pin 1 is marked by a notch or dot; package height is 4.57 mm max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE\, 2OE\ | Active-low output-enable inputs - Assert low to enable respective 4-bit buffer section. |
| 2–5, 13–16 | 1A1–1A4, 2A1–2A4 | Data inputs - Noninverting inputs for each of eight channels across two groups. |
| 6–9, 11–14 | 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs - High-impedance when OE\ is high; otherwise pass A-to-Y logic level. |
| 10 | GND | Ground reference - Single ground pin for entire device; layout must minimize impedance. |
| 20 | VCC | Positive supply - Requires local 0.1-µF ceramic decoupling capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Stage | Combines bipolar sink strength (128 mA) with CMOS-like low ICCZ (4–10 mA), reducing heat and power in dense bus buffers. |
| P-N-P Input Structure | Reduces input DC loading to <1 mA per input, preserving fanout margin of upstream TTL or BCT drivers. |
| 3-State Bus Interface | Two independent OE\ controls allow interleaved or segmented bus arbitration without external logic. |
| TTL-Compatible Output Levels | VOH ≥ 2.4 V @ IOL = 48 mA and VOL ≤ 0.55 V @ IOL = 64 mA ensure reliable interfacing with legacy 5-V TTL systems. |
| MIL-STD-883C ESD Rating | Exceeds 2000 V HBM - Eliminates need for external ESD protection diodes in controlled assembly environments. |
Applications
| Memory Address Buffering | Parallel Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing fanout expansion and bus contention control via OE\ signals. Use Value: Delivers 128-mA sink current per output to meet TTL input current requirements across up to 10 downstream devices. | Use Scenario: Isolating bidirectional data paths between CPU and peripheral controllers using discrete direction control. IC Role / Device Role / Timing Role: Unidirectional buffer section enabling time-multiplexed read/write cycles on shared data lines. Use Value: Sub-5-ns propagation delay ensures setup/hold timing compliance in 8-MHz bus systems with minimal skew. |
| Legacy Industrial Backplane | TTL-Level Clock Distribution |
Use Scenario: Signal conditioning and level restoration across long PCB traces in factory automation rack-mounted I/O modules. IC Role / Device Role / Timing Role: Repeater/buffer compensating for trace capacitance-induced rise/fall time degradation. Use Value: Low ICCZ (4–10 mA) minimizes cumulative quiescent power in multi-channel backplane driver cards. | Use Scenario: Distributing a master clock signal to multiple synchronous peripherals requiring TTL-compatible thresholds. IC Role / Device Role / Timing Role: Fanout buffer ensuring monotonic edge integrity and load-matched drive strength. Use Value: P-N-P inputs prevent loading of sensitive oscillator outputs, preserving jitter performance in timing-critical subsystems. |
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 (32 mA), lower IOL (24 mA), slower tPLH (15 ns). | Limited drive strength and speed; suitable only for low-fanout, low-frequency legacy systems. | Select only if replacing original LS-family designs where BiCMOS advantages are unnecessary. |
| SN74LVC244APWR | 3.3-V CMOS; supports 5-V tolerant inputs; IOL = 24 mA; tPLH = 3.2 ns; RoHS-compliant. | Not pin-compatible; requires level-shifting or redesign for 5-V bus integration. | Choose for new 3.3-V designs needing low power and modern packaging - not a drop-in replacement. |
Compared with SN74BCT244NG4, SN74LS244N trades speed and drive for simplicity in aging systems, while SN74LVC244APWR offers modern efficiency and density at the cost of voltage and pinout compatibility - neither is pin-compatible, and both require schematic or layout revision.
Availability
SN74BCT244NG4 is available at Aetrix Electronics and suitable for memory address buffering, parallel bus interface, and legacy industrial backplane applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT244NG4 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 SN74BCT244NG4 belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered to bridge TTL performance with CMOS power efficiency for high-density 5-V bus interface applications in the late 1980s and 1990s.
FAQ
What is the maximum operating temperature range for SN74BCT244NG4?
The SN74BCT244NG4 is characterized for operation from 0°C to 70°C - a commercial-grade temperature range. It is not rated for extended industrial (−40°C to 85°C) or military (−55°C to 125°C) conditions. Exceeding 70°C may cause parametric shift or reliability degradation; thermal derating is not specified in the datasheet.
Can SN74BCT244NG4 operate from a 3.3-V supply?
No, SN74BCT244NG4 requires a minimum supply voltage of 4.5 V and is specified only for 4.5–5.5 V operation. Applying 3.3 V will result in undefined logic behavior, insufficient output drive, and failure to meet VOH/VOL specifications. It is not 3.3-V compatible or 5-V tolerant in supply mode.
Does SN74BCT244NG4 support hot-swap or live-insertion?
No, SN74BCT244NG4 does not support hot-swap. Its absolute maximum ratings do not include powered insertion sequences, and the input/output structures lack bus-hold or power-up/down protection circuitry. Power sequencing must follow VCC-before-inputs and inputs-before-VCC guidelines to avoid latch-up or damage.
What is the function of the P-N-P input structure in SN74BCT244NG4?
SN74BCT244NG4 uses P-N-P input transistors to minimize DC input current - limiting IIL to −1 mA and IIH to 20 µA. This reduces loading on upstream drivers, preserves fanout capability, and avoids voltage droop on shared address or data buses driven by other TTL or BCT devices.
Is SN74BCT244NG4 RoHS compliant?
Yes, SN74BCT244NG4 (orderable part number SN74BCT244N) is RoHS compliant, with lead finish NIPDAU and exemption status confirmed in TI's Packaging Addendum. The "G4" suffix denotes green (halogen-free) packaging per TI's specification, aligning with EU RoHS Directive 2011/65/EU.
SN74BCT244NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74BCT244NG4 FAQ
1.How can I place an order for SN74BCT244NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT244NG4 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 SN74BCT244NG4 reliable?
The price and inventory of SN74BCT244NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT244NG4 is usually 5 days.
3.What payment methods are accepted for SN74BCT244NG4?
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4.How is shipping managed for SN74BCT244NG4?
SN74BCT244NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT244NG4 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 SN74BCT244NG4?
For technical support, including SN74BCT244NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT244NG4 requirements.
6.How does Aetrix verify that SN74BCT244NG4 is sourced from the original manufacturer or authorized distributors?
All SN74BCT244NG4 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 SN74BCT244NG4 meets industry standards.
7.What is the process for return or replacement of SN74BCT244NG4?
All SN74BCT244NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT244NG4, 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 SN74BCT244NG4 part is unused and in its original packaging.
Return procedure for SN74BCT244NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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