My Inquiry
My Account
Texas Instruments SN74BCT2244NSR
- Part No.:
- SN74BCT2244NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74BCT2244NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74BCT2244NSR from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in 5-V TTL systems. It operates from 4.5 V to 5.5 V, features integrated 33-Ω series output resistors, supports ±12 mA drive strength, and delivers propagation delays as low as 0.5 ns (tPLH). It is used in high-density bus interface applications requiring controlled edge rates and low overshoot.
For engineers reviewing the SN74BCT2244NSR datasheet, SN74BCT2244NSR pinout, SN74BCT2244NSR application, or SN74BCT2244NSR equivalent, key selection criteria include 3-state bus-driving capability, BiCMOS output impedance matching, guaranteed 5-V operation, thermal performance in NS package (θJA = 60°C/W), and compatibility with legacy TTL-level control logic.
Technical Context
The SN74BCT2244NSR implements two independent 4-bit noninverting buffer sections, each with active-low 3-state enable (1OE, 2OE). Its BiCMOS architecture reduces ICCZ quiescent current while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VVIH = 2.0 V) and rail-to-rail output swing.
Each output integrates a 33-Ω series resistor to dampen transmission-line reflections without external components. The device meets bus-oriented timing requirements with tPZH/tPZL ≤ 9.4 ns and tPHL/tPLH ≤ 6.7 ns at VCC = 5 V, CL = 50 pF, and TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial 5-V rail tolerances. |
| Output Drive | ±12 mA - Sinks or sources sufficient current to drive multiple TTL loads or stubbed bus lines. |
| Propagation Delay | 0.5–6.7 ns - Enables high-speed address/data buffering in memory subsystems up to ~200 MHz effective rate. |
| 3-State Enable Time | 2.4–10.4 ns - Supports fast bus arbitration and multiplexed resource sharing. |
| Input Capacitance | 6 pF - Minimizes loading on upstream drivers and preserves signal integrity in fan-out-critical paths. |
| Thermal Resistance | θJA = 60°C/W (NS package) - Allows sustained operation at full drive under typical PCB copper area conditions. |
| Output Series Resistor | 33 Ω - Eliminates need for external termination resistors on point-to-point or short stub buses. |
Pinout & Package
SOP–NS package: 20-pin small-outline plastic package, 0.65 mm pitch, 7.6 mm × 12.6 mm body, 2.65 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls 4-bit group; must be pulled high via resistor during power-up to ensure Hi-Z state. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | TTL-compatible inputs accepting 0.8 V / 2.0 V thresholds; require tie-high/tie-low if unused. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Each includes internal 33-Ω series resistor; capable of sourcing/sinking ±12 mA into bus loads. |
| VCC (Pin 20) | Power supply | 5-V nominal supply; decoupling required near pin to suppress switching noise. |
| GND (Pin 10) | Ground reference | Common return for all I/O and internal circuitry; requires low-inductance connection to plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 33-Ω output series resistors | Eliminates external termination components, reducing BOM count and PCB layout complexity for bus interfaces. |
| BiCMOS output stage | Reduces ICCZ quiescent supply current versus bipolar-only equivalents, lowering system standby power. |
| Guaranteed 5-V operation | Validated over 4.5–5.5 V range, ensuring compatibility with regulated 5-V supplies and tolerance to ripple or droop. |
| Low propagation skew | Typical tPLH/tPHL variation < 1.5 ns across channels enables synchronous multi-bit addressing. |
| Bus-hold immunity | No bus-hold circuitry - unused inputs must be externally tied to VCC or GND per TI SCBA004 guidance to prevent floating node oscillation. |
Applications
| Memory Address Buffering | System Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or EPROM chips in embedded control systems. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing level translation, fan-out expansion, and bus contention control between CPU and memory. Use Value: Integrated 33-Ω resistors suppress ringing on long traces; 0.5 ns tPLH ensures setup time margin for 20-MHz address strobes. | Use Scenario: Isolating and driving shared data/address buses among multiple peripherals in industrial PLC backplanes. IC Role / Device Role / Timing Role: Octal line driver enabling time-multiplexed access to common bus resources using OE-controlled tri-state arbitration. Use Value: Symmetrical active-low OE inputs simplify enable logic design; ±12 mA drive sustains signal integrity across 10+ TTL loads. |
| Clock Distribution | Legacy TTL System Upgrade |
Use Scenario: Distributing buffered clock signals to multiple synchronous logic blocks in test equipment or instrumentation. IC Role / Device Role / Timing Role: Low-skew noninverting buffer preserving edge fidelity and minimizing jitter accumulation across fan-out paths. Use Value: 6 pF input capacitance minimizes loading on master oscillator; 33-Ω series resistance damps clock line overshoot. | Use Scenario: Replacing obsolete 74LS244 in legacy military or telecom chassis requiring extended temperature support and improved drive. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering higher speed, lower ICCZ, and integrated termination versus bipolar TTL. Use Value: Maintains identical pinout and logic function while improving timing margins and reducing external component count. |
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 |
|---|---|---|---|
| SN74ACT244NSR | Advanced CMOS (ACT), 4.5–5.5 V, 24 mA drive, no internal series resistors. | Higher drive but requires external termination; faster (tPLH = 2.5 ns typ), higher Ci (10 pF). | Choose when maximum speed and drive are critical and board layout allows discrete termination. |
| SN74LVC244APW | Lower-voltage CMOS (LVC), 1.65–3.6 V only, 24 mA drive, no internal resistors. | Not 5-V compatible; unsuitable for direct replacement in legacy 5-V systems. | Select only for new 3.3-V designs where voltage scaling and lower power outweigh compatibility needs. |
Compared with SN74ACT244NSR and SN74LVC244APW, the SN74BCT2244NSR uniquely combines 5-V TTL compatibility, integrated 33-Ω termination, and BiCMOS efficiency-making it the optimal choice for retrofitting or sustaining legacy bus-driven systems without layout changes.
Availability
SN74BCT2244NSR is available at Aetrix Electronics and suitable for memory address buffering, system bus interfacing, and clock distribution applications requiring stable component supply and long-term industrial availability.
Supply support for SN74BCT2244NSR 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT2244NSR belongs to TI's BCT logic family, engineered specifically to enhance performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers/transmitters in 5-V TTL systems.
FAQ
What is the operating voltage range for SN74BCT2244NSR?
The SN74BCT2244NSR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures reliable functionality across standard 5-V power rails with typical tolerance and ripple. Operation outside this range may cause undefined behavior or permanent damage, as specified in the absolute maximum ratings. The SN74BCT2244NSR is not rated for 3.3-V operation.
Does SN74BCT2244NSR require external series resistors on its outputs?
No, the SN74BCT2244NSR does not require external series resistors. Each output integrates a 33-Ω series resistor to reduce overshoot and undershoot on transmission lines. This feature eliminates the need for discrete termination components in point-to-point or short-stub bus configurations, simplifying PCB layout and reducing BOM cost.
What is the maximum output drive capability of SN74BCT2244NSR?
The SN74BCT2244NSR outputs can source or sink up to ±12 mA per channel under recommended operating conditions. This drive strength supports fan-out to multiple TTL loads or direct connection to terminated bus lines. Exceeding ±12 mA risks violating VOL/VOH specifications or exceeding absolute maximum ratings.
How should unused inputs be handled on SN74BCT2244NSR?
All unused inputs on the SN74BCT2244NSR must be tied to either VCC or GND to ensure proper device operation and prevent floating-node oscillation. TI recommends following Application Report SCBA004 for implementation guidance. Leaving inputs unconnected may result in increased ICC, noise susceptibility, or erratic output behavior.
Is SN74BCT2244NSR pin-compatible with SN74LS244N?
Yes, the SN74BCT2244NSR is functionally and pin-compatible with SN74LS244N in the same SOIC–NS package footprint. Both devices share identical pin assignments, logic function (octal noninverting 3-state buffer), and 20-pin SOP outline. However, SN74BCT2244NSR offers improved speed, lower ICCZ, integrated 33-Ω resistors, and enhanced drive capability over the LS variant.
SN74BCT2244NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 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-SO
SN74BCT2244NSR FAQ
1.How can I place an order for SN74BCT2244NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2244NSR 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 SN74BCT2244NSR reliable?
The price and inventory of SN74BCT2244NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2244NSR is usually 5 days.
3.What payment methods are accepted for SN74BCT2244NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT2244NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT2244NSR?
SN74BCT2244NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2244NSR 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 SN74BCT2244NSR?
For technical support, including SN74BCT2244NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2244NSR requirements.
6.How does Aetrix verify that SN74BCT2244NSR is sourced from the original manufacturer or authorized distributors?
All SN74BCT2244NSR 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 SN74BCT2244NSR meets industry standards.
7.What is the process for return or replacement of SN74BCT2244NSR?
All SN74BCT2244NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2244NSR, 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 SN74BCT2244NSR part is unused and in its original packaging.
Return procedure for SN74BCT2244NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74BCT2244NSR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
