My Inquiry
My Account
Texas Instruments 74AC11244NT
- Part No.:
- 74AC11244NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
74AC11244NT.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74AC11244NT from Texas Instruments is an octal 3-state buffer/driver IC in a 24-pin plastic DIP package, operating from 3 V to 5.5 V, with typical propagation delay of 4.9 ns (VCC = 5 V), ±24 mA output drive, and high-impedance outputs controlled by active-low OE pins - used for memory address buffering and bus driving in industrial control systems.
For engineers reviewing the 74AC11244NT datasheet, 74AC11244NT pinout, 74AC11244NT application, or 74AC11244NT equivalent, key selection criteria include 3-state output timing (tPLH/tPHL ≤ 6.7 ns), dual 4-bit enable control, flow-through pinout for PCB layout optimization, and latch-up immunity of 500 mA at 125°C.
Technical Context
The 74AC11244NT implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (1OE, 2OE) controlling four Y outputs. Its EPIC™ 1-µm CMOS process enables rail-to-rail input compatibility and low-noise switching via center-pin VCC/GND configuration.
It supports dual-bank operation: either as one 8-bit buffer (with both OE tied) or two isolated 4-bit buses. The flow-through architecture places inputs on one side (pins 13–20, 22–24) and outputs on opposite sides (pins 1–4, 9–12), minimizing trace crossovers in dense layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - compatible with 3.3 V and 5 V logic systems without level translation |
| Propagation Delay | 4.9 ns max (VCC = 5 V) - enables reliable operation in sub-100 MHz address/data bus applications |
| Output Drive | ±24 mA (IOL/IOH) - sufficient to drive 50-pF loads across 10-inch PCB traces |
| Input Thresholds | VIH = 3.15 V min (VCC = 4.5 V); VIL = 1.35 V max - ensures noise margin > 0.8 V under nominal conditions |
| 3-State Leakage | ±5 µA (IOZ) at VCC = 5.5 V - prevents unintended bus contention during high-impedance state |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature range without derating |
| Latch-Up Immunity | 500 mA typical at 125°C - exceeds JEDEC JESD78 Class II requirements |
Pinout & Package
74AC11244NT uses a 24-pin plastic dual in-line package (PDIP-24, suffix NT), with 0.3-inch body width and through-hole mounting. Pin 1 is top-left corner (notch-up orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4, 2Y1–2Y4 | Buffered Outputs | Noninverted outputs for Bank 1 (pins 1–4) and Bank 2 (pins 9–12); high-Z when respective OE is high |
| 1A1–1A4, 2A1–2A4 | Input Signals | Direct logic inputs for Bank 1 (pins 22–20, 24) and Bank 2 (pins 16–14, 13); no internal pullups/pulldowns |
| 1OE, 2OE | Output Enable | Active-low controls: drives corresponding Y outputs only when low; tie to VCC via pullup for power-up safety |
| VCC (pins 24, 16) | Power Supply | Two dedicated VCC pins reduce IR drop and supply noise; center-positioned for balanced decoupling |
| GND (pins 5–8) | Ground Return | Four contiguous GND pins minimize ground bounce and provide low-inductance return paths |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs and outputs placed on opposite sides of package - eliminates layer jumps and reduces signal crosstalk in PCB routing |
| Center-pin VCC/GND | VCC (pins 24, 16) and GND (pins 5–8) centrally located - lowers simultaneous switching noise (SSN) by shortening current loops |
| Dual independent OE control | Separate 1OE (pin 23) and 2OE (pin 17) - enables selective bank isolation for partial bus arbitration or power gating |
| EPIC™ CMOS process | 1-µm implanted CMOS - delivers AC performance comparable to bipolar while retaining CMOS low static power and high noise immunity |
| 500-mA latch-up immunity | Tested per JEDEC JESD78 - ensures robustness against transient overvoltage and ESD-induced latch-up in industrial environments |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs; enables time-multiplexed access to multiple memory banks. Use Value: Propagation delay ≤ 6.7 ns ensures setup/hold timing margins at 25-MHz bus clock; dual OE allows dynamic bank selection without address glitches. | Use Scenario: Level-shifting and fanout expansion between PLC I/O modules and backplane data lanes. IC Role / Device Role / Timing Role: Octal driver conditioning digital control signals before transmission over 10-cm PCB traces to remote terminal units. Use Value: ±24 mA drive strength maintains signal integrity into 50-pF loads; high-impedance state prevents bus contention during module hot-swap. |
| Legacy System Upgrade | Test Equipment Signal Routing |
Use Scenario: Replacing obsolete TTL buffers (e.g., 74LS244) in aging instrumentation control boards. IC Role / Device Role / Timing Role: Drop-in-compatible CMOS buffer offering lower power, higher speed, and wider voltage tolerance than LS-family parts. Use Value: 3 V–5.5 V operation supports mixed-voltage upgrades; 500-mA latch-up immunity improves field reliability vs. legacy bipolar parts. | Use Scenario: Multiplexing stimulus signals from ATE pattern generators to DUT pins under software control. IC Role / Device Role / Timing Role: 3-state-enabled signal gate - enables dynamic reconfiguration of test path routing without hardware changes. Use Value: Dual OE pins allow independent activation of two 4-bit signal groups; flow-through layout simplifies automated test fixture wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC244N | Same AC family, identical pinout (PDIP-20), but only 8 total outputs (single OE); lacks dual-bank isolation | Requires external logic for bank-select functionality; not suitable where independent 4-bit control is mandatory | Select when cost or board space favors 20-pin package and single-enable operation suffices |
| 74ACT11244N | TTL-compatible input thresholds (VIH = 2 V min); otherwise identical AC specs and pinout | Better interoperability with legacy 5-V TTL sources; slightly higher ICC (max 120 µA vs. 80 µA) | Select when interfacing directly with 74LS/74F logic without level shifters |
Compared with SN74AC244N and 74ACT11244N, the 74AC11244NT provides unique dual-OE control in a 24-pin DIP, enabling true 4+4 independent bus management - critical for memory-mapped I/O and modular backplane designs where bank-level isolation is required.
Availability
74AC11244NT is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment repair, and test instrumentation requiring stable component supply and long-term obsolescence support.
Supply support for 74AC11244NT 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 headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets since 1930.
The 74AC11244NT belongs to TI's AC-series advanced CMOS logic family, designed specifically to replace TTL in high-speed, low-power address and data bus applications while maintaining pin compatibility with legacy 74xx footprints.
FAQ
What is the recommended power-up sequence for the 74AC11244NT?
TI recommends tying both 1OE and 2OE to VCC via pullup resistors (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. This prevents bus contention before system initialization completes. The 74AC11244NT has no internal power-on reset, so external OE control is essential for safe startup in multi-driver bus systems.
Can the 74AC11244NT operate reliably at 3.3 V?
Yes, the 74AC11244NT is fully specified for 3 V to 5.5 V operation. At VCC = 3.3 V, it delivers VOH ≥ 2.58 V and VOL ≤ 0.44 V with 12 mA drive, meeting LVTTL and 3.3-V CMOS interface requirements. Propagation delay increases to ≤10.2 ns, remaining suitable for ≤50-MHz address bus applications.
How does the flow-through pinout of the 74AC11244NT improve PCB layout?
The flow-through pinout places all A inputs on the right side (pins 13–20, 22–24) and Y outputs on left/top (pins 1–4, 9–12), enabling straight trace routing without layer changes or vias. This reduces parasitic inductance, minimizes crosstalk between adjacent channels, and simplifies autorouting - especially valuable in dense industrial control PCBs where signal integrity and EMI compliance are critical.
Is the 74AC11244NT pin-compatible with the 74LS244?
No - the 74AC11244NT uses a 24-pin PDIP package with dual OE and separate VCC/GND pins, whereas the 74LS244 is a 20-pin device with single OE and different pin mapping. While functionally similar as octal buffers, direct replacement requires PCB redesign. For drop-in LS replacement, consider SN74AC244N (20-pin, single OE) instead of 74AC11244NT.
What is the maximum capacitive load the 74AC11244NT can drive while maintaining timing specs?
The 74AC11244NT is characterized with CL = 50 pF in its switching specifications (e.g., tPLH ≤ 6.7 ns at VCC = 5 V). It can reliably drive up to 75 pF with minor timing degradation (<15% increase in delay), but for guaranteed spec compliance across temperature and voltage, TI specifies 50 pF as the maximum load capacitance in datasheet timing tables.
74AC11244NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
74AC11244NT FAQ
1.How can I place an order for 74AC11244NT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11244NT 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 74AC11244NT reliable?
The price and inventory of 74AC11244NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11244NT is usually 5 days.
3.What payment methods are accepted for 74AC11244NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11244NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11244NT?
74AC11244NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11244NT 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 74AC11244NT?
For technical support, including 74AC11244NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11244NT requirements.
6.How does Aetrix verify that 74AC11244NT is sourced from the original manufacturer or authorized distributors?
All 74AC11244NT 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 74AC11244NT meets industry standards.
7.What is the process for return or replacement of 74AC11244NT?
All 74AC11244NT units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11244NT, 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 74AC11244NT part is unused and in its original packaging.
Return procedure for 74AC11244NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AC11244NT 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…
