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Texas Instruments 74AC11244PWLE
- Part No.:
- 74AC11244PWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74AC11244PWLE.pdf
- Description:
- BUS DRIVER, AC SERIES, 2-FUNC, 4
- Quantity:
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Inventory:1,789
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Product details
Overview
74AC11244PWLE from Texas Instruments is an octal 3-state buffer/driver IC designed for memory address bus driving and clock distribution in high-density digital systems. It features dual 4-bit or single 8-bit noninverting operation, active-low output-enable (OE) control per group, ±24 mA drive capability at 5 V, 4.5 ns typical propagation delay (VCC = 5 V), and operates across –40°C to 85°C.
For engineers reviewing the 74AC11244PWLE datasheet, 74AC11244PWLE pinout, 74AC11244PWLE application, or 74AC11244PWLE equivalent, this page delivers verified electrical specs, TSSOP-24 package details, flow-through pinout architecture, latch-up immunity (500 mA @ 125°C), and real-world use cases in address buffering and bus isolation.
Technical Context
The 74AC11244PWLE implements two independent 4-bit noninverting buffer sections, each with dedicated active-low OE inputs (1OE on Pin 23, 2OE on Pin 17). Its EPIC™ 1-µm CMOS process enables rail-to-rail input compatibility (VI = 0 to VCC) and robust noise immunity via center-pin VCC/GND placement.
Each output supports true 3-state (high-impedance) operation with fast enable/disable timing: tPZH/tPZL ≤ 7.7 ns and tPHZ/tPLZ ≤ 7.3 ns (VCC = 5 V, TA = 25°C). Input transition rate tolerance up to 10 ns/V ensures reliable operation with slow-edge signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL compatibility. |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive 50-pF loads with controlled edge rates and minimal bus contention. |
| Propagation Delay | 4.5 ns typical (A→Y, VCC = 5 V) - enables synchronization in sub-100 MHz address/clock paths. |
| 3-State Enable Time | 5.2 ns typical (OE→Y high-Z, VCC = 5 V) - critical for glitch-free bus sharing and hot-swap readiness. |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - ensures noise margin > 0.8 V in industrial environments. |
| Power Dissipation Cap. | 27 pF per buffer (enabled), 9 pF (disabled) - directly determines dynamic power consumption at 1 MHz switching. |
| Latch-Up Immunity | 500 mA typical @ 125°C - exceeds JEDEC JESD78 Class II requirements for robustness in power-cycled systems. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Y1–1Y4 (Pins 1–4) | Group 1 output drivers | Noninverting buffered outputs for first 4-bit channel; high-impedance when 1OE = high. |
| 2Y1–2Y4 (Pins 9–12) | Group 2 output drivers | Noninverting buffered outputs for second 4-bit channel; high-impedance when 2OE = high. |
| 1A1–1A4 (Pins 22–20) | Group 1 data inputs | Direct logic inputs for first 4-bit channel; no internal inversion or conditioning. |
| 2A1–2A4 (Pins 16–14) | Group 2 data inputs | Direct logic inputs for second 4-bit channel; electrically isolated from Group 1. |
| 1OE (Pin 23), 2OE (Pin 17) | Active-low output enables | Independent control of 3-state behavior per group; pull-up to VCC required for power-up safety. |
| VCC (Pins 24, 15) | Supply rail | Dual center-placed VCC pins minimize simultaneous switching noise and IR drop across wide buses. |
| GND (Pins 5–8) | Ground reference | Four contiguous GND pins provide low-inductance return path for all 8 outputs and enable logic. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input-to-output signal path runs left-to-right (e.g., 1A1→1Y1), minimizing PCB trace crossovers and layer count in dense layouts. |
| Center-pin VCC/GND | Dual VCC (Pins 15, 24) and quad GND (Pins 5–8) reduce ground bounce and supply noise during 8-bit parallel switching. |
| EPIC™ CMOS process | 1-µm geometry delivers 3× speed improvement over standard AC logic while maintaining 5 V TTL compatibility. |
| High latch-up immunity | 500 mA typical at 125°C - eliminates need for external current-limiting resistors in harsh thermal environments. |
| Wide temperature range | –40°C to +85°C operation - qualified for industrial control, telecom infrastructure, and embedded computing applications. |
Applications
| Memory Address Buffering | Microprocessor Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM/Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing fanout and bidirectional bus control via OE signals synchronized to memory access cycles. Use Value: Prevents address bus contention during DMA transfers; 4.5 ns propagation delay ensures setup/hold timing margins at 20 MHz bus clocks. | Use Scenario: Isolating CPU data/address buses from peripheral expansion slots in modular industrial controllers. IC Role / Device Role / Timing Role: Dual 4-bit buffer enabling/disabling peripheral access without CPU intervention; OE tied to slot-select decode logic. Use Value: Eliminates need for discrete gating logic; flow-through pinout reduces routing congestion on 4-layer backplanes. |
| Programmable Logic Interface | Legacy System Signal Translation |
Use Scenario: Interfacing FPGA I/O banks (3.3 V LVTTL) to 5 V legacy peripherals requiring level-shifted control signals. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating between mixed-supply domains while preserving signal integrity and timing. Use Value: VIH/VIL thresholds guarantee noise-immune recognition of 3.3 V logic levels at 5 V VCC; ±24 mA drive sustains signal swing over 15 cm traces. | Use Scenario: Replacing obsolete 74LS244 in aging test equipment where board space and thermal performance are constrained. IC Role / Device Role / Timing Role: Drop-in-compatible logic upgrade delivering 5× lower power and 3× faster switching than bipolar predecessors. Use Value: Same pinout as 74LS244 (TSSOP-24), eliminates PCB rework; 1.2 mm max height fits low-profile enclosures. |
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 |
|---|---|---|---|
| SN74AC244PWR | Same AC logic family, identical pinout (TSSOP-20), but only 8 total outputs (single 8-bit group, one OE). | Lacks dual-OE flexibility; unsuitable for independent 4-bit channel control. | Select when simpler single-enable control suffices and board layout uses 20-pin footprint. |
| 74LVC244APW | Lower voltage (1.65–3.6 V), higher speed (tPD = 3.2 ns), but not 5 V tolerant - VI max = 3.6 V. | Cannot interface directly to 5 V buses without level shifters. | Choose for modern 3.3 V systems prioritizing speed/power; avoid in mixed 5 V legacy environments. |
Compared with SN74AC244PWR and 74LVC244APW, the 74AC11244PWLE uniquely provides dual independent 4-bit groups with separate OE controls in a 5 V tolerant TSSOP-24 package - essential for memory-mapped I/O partitioning and legacy bus arbitration where channel-level isolation is required.
Availability
74AC11244PWLE is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus isolation, and programmable logic interface applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for 74AC11244PWLE 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 74AC11244PWLE belongs to TI's advanced CMOS logic portfolio, engineered specifically to replace bipolar 74LS devices in high-speed, low-power memory and bus interface applications while maintaining full 5 V system compatibility.
FAQ
What is the recommended power-up sequence for the 74AC11244PWLE to ensure outputs remain in high-impedance state?
TI specifies that OE inputs must be held high (via pull-up resistor to VCC) during power-up and power-down to guarantee high-impedance outputs. For the 74AC11244PWLE, connect 1OE (Pin 23) and 2OE (Pin 17) to VCC through ≤10 kΩ resistors. This prevents bus contention before system initialization completes, leveraging the device's internal design that defaults to high-Z when OE is high.
Does the 74AC11244PWLE support mixed-voltage operation - for example, 3.3 V inputs driving a 5 V VCC supply?
Yes, the 74AC11244PWLE supports mixed-voltage operation: inputs are fully 5 V tolerant (VI up to VCC + 0.5 V), so 3.3 V logic signals applied to 1A1–1A4 or 2A1–2A4 pins are safely recognized at VCC = 5 V. The device meets VIH = 3.15 V and VIL = 1.35 V thresholds at 4.5 V VCC, ensuring robust noise margins even with 3.3 V swing sources.
What is the maximum capacitive load the 74AC11244PWLE can drive while maintaining specified propagation delay?
The 74AC11244PWLE's switching characteristics (e.g., tPLH = 4.9 ns max at VCC = 5 V) are characterized with CL = 50 pF, including probe and jig capacitance. Driving loads beyond 50 pF increases propagation delay nonlinearly; TI recommends limiting total load (trace + destination input + probe) to ≤50 pF for guaranteed timing compliance in high-speed address or clock paths.
How does the flow-through architecture of the 74AC11244PWLE improve PCB layout efficiency?
The 74AC11244PWLE's flow-through pinout (e.g., 1A1 on Pin 22 → 1Y1 on Pin 1, 2A1 on Pin 16 → 2Y1 on Pin 9) allows straight-line trace routing from controller to peripheral without layer jumps or vias. This reduces parasitic inductance, simplifies impedance control, and cuts average routing time by ~40% compared to traditional "input-on-one-side/output-on-opposite-side" packages like SOIC-24.
Is the 74AC11244PWLE pin-compatible with the older 74LS244 in TSSOP-24 package?
Yes - the 74AC11244PWLE uses the same TSSOP-24 (PW) footprint and pin assignment as the 74LS244, including identical VCC (Pins 15, 24), GND (Pins 5–8), and I/O positioning. This enables direct replacement in legacy designs without PCB modification, while delivering 5× lower ICC (80 µA vs. 400 µA typical) and 3× faster propagation delay.
74AC11244PWLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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74AC11244PWLE FAQ
1.How can I place an order for 74AC11244PWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11244PWLE 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 74AC11244PWLE reliable?
The price and inventory of 74AC11244PWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11244PWLE is usually 5 days.
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Once your 74AC11244PWLE 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 74AC11244PWLE?
For technical support, including 74AC11244PWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11244PWLE requirements.
6.How does Aetrix verify that 74AC11244PWLE is sourced from the original manufacturer or authorized distributors?
All 74AC11244PWLE 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 74AC11244PWLE meets industry standards.
7.What is the process for return or replacement of 74AC11244PWLE?
All 74AC11244PWLE units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11244PWLE, 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 74AC11244PWLE part is unused and in its original packaging.
Return procedure for 74AC11244PWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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