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Texas Instruments 74AC11240PWRE4
- Part No.:
- 74AC11240PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11240PWRE4.pdf
- Description:
- IC BUFF INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,025
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Product details
Overview
74AC11240PWRE4 from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections and independent active-low 3-state output-enable (OE) inputs, operating from 3 V to 5.5 V, delivering ±24 mA output drive at 5 V, with propagation delays as low as 4.6 ns (tPHL), and designed for high-density memory address, clock, and bus driver applications.
For engineers reviewing the 74AC11240PWRE4 datasheet, 74AC11240PWRE4 pinout, 74AC11240PWRE4 application, or 74AC11240PWRE4 equivalent, key selection considerations include its flow-through pin architecture for optimized PCB layout, center-pin VCC/GND configuration to suppress switching noise, EPIC CMOS process for latch-up immunity up to 500 mA at 125°C, and TSSOP-24 packaging compatible with automated SMT assembly.
Technical Context
This device implements two independent 4-bit inverting buffers, each with dedicated active-low OE control - enabling selective 3-state output disabling without affecting the other section. Its logic behavior is strictly defined: when OE is low, Y = NOT(A); when OE is high, Y presents high-impedance.
Designed using Texas Instruments' EPIC (Enhanced-Performance Implanted CMOS) 1-µm process, it achieves symmetrical input/output thresholds, rail-to-rail output swing, and robust noise margins (VIL ≤ 1.65 V, VIH ≥ 3.15 V at VCC = 4.5 V), while supporting operation across –40°C to 85°C with guaranteed timing performance at both 3.3 V and 5 V supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL-compatible operation. |
| Output Drive Strength | ±24 mA at VCC = 4.5 V - sufficient to drive multiple TTL loads or terminated transmission lines without external buffering. |
| Propagation Delay (tPHL) | 4.6 ns max at VCC = 5 V - enables reliable operation in high-speed address/data bus timing paths up to ~100 MHz. |
| 3-State Enable/Disable Time | tPZH = 8.2 ns, tPHZ = 6.3 ns max at VCC = 5 V - ensures clean bus arbitration with minimal contention window during output state transitions. |
| Input Capacitance (Ci) | 4 pF at VCC = 5 V - minimizes loading on upstream drivers and preserves signal integrity in fan-out-critical nodes. |
| Power Dissipation Capacitance | 39 pF per buffer (outputs enabled) - enables accurate dynamic power estimation in clocked or burst-mode applications. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and commercial computing infrastructure. |
Pinout & Package
TSSOP-24 package (PW suffix), 0.65 mm pitch, 7.8 mm × 4.4 mm body, 1.2 mm max height, with exposed thermal pad (non-electrical), RoHS-compliant CU-NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | 1A1–1A4 | Section 1 data inputs - inverted and gated by 1OE; flow-through placement reduces trace crossovers. |
| 5 | 1OE | Active-low enable for Section 1 outputs - drives all four Y outputs simultaneously into high-Z when high. |
| 6, 7, 8, 9 | 1Y1–1Y4 | Section 1 inverted 3-state outputs - electrically isolated when 1OE = high; compatible with bus-hold or pull-up networks. |
| 10, 11, 12, 13 | 2A1–2A4 | Section 2 data inputs - functionally identical to 1Ax but independently controlled; supports dual-bus isolation. |
| 14 | 2OE | Active-low enable for Section 2 outputs - decouples timing between bus segments for staggered access control. |
| 15, 16, 17, 18 | 2Y1–2Y4 | Section 2 inverted 3-state outputs - share same electrical specs as 1Yx; pin-aligned for parallel routing. |
| 19, 20, 21, 22 | GND | Four dedicated ground terminals - distributed to minimize ground bounce and improve noise immunity at high switching rates. |
| 23, 24 | VCC | Two dedicated VCC terminals - center-placed to reduce supply inductance and stabilize local rail during simultaneous output transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Input-to-output signal path aligned left-to-right across package - eliminates layer jumps and vias in dense PCB layouts. |
| Center-pin VCC and GND | Dual VCC (pins 23–24) and quad GND (pins 19–22) placed centrally - lowers loop inductance and suppresses simultaneous switching noise. |
| EPIC CMOS process | 1-µm implanted CMOS technology - delivers 500 mA typical latch-up immunity at 125°C, exceeding JEDEC JESD78 requirements. |
| Symmetrical active-low OE | Identical timing and threshold specs for 1OE and 2OE - enables deterministic bus arbitration and avoids skew-induced glitches. |
| High fan-out capability | Drives ≥10 LSTTL loads or 20 CMOS loads per output - reduces need for intermediate buffers in memory subsystems. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or Flash memory in space-constrained industrial controller. IC Role / Device Role / Timing Role: Inverting octal buffer with dual OE control isolates address latching stages and prevents bus contention during page mode cycles. Use Value: Flow-through pinout allows direct layer routing without vias; ±24 mA drive ensures setup/hold timing margin across 10 cm traces at 20 MHz. |
Use Scenario: Distributing a master system clock to multiple peripheral ICs (UART, SPI, ADC) with synchronized enable control. IC Role / Device Role / Timing Role: Dual-section 3-state driver enables time-multiplexed clock delivery - one section active while the other is tri-stated for glitch-free reconfiguration. Use Value: Sub-5 ns propagation delay and matched tPHL/tPLH ensure <100 ps skew across eight outputs, preserving clock duty cycle integrity. |
| PCI/ISA Bus Transceiver Interface | Legacy Parallel Port Driver |
|
Use Scenario: Level-shifting and buffering 8-bit data lines between 3.3 V FPGA and 5 V ISA bus peripherals in retro-computing hardware. IC Role / Device Role / Timing Role: Inverting buffer with 5 V-tolerant inputs accepts TTL-level signals; 3-state outputs isolate bus segments during DMA cycles. Use Value: Guaranteed 5.5 V absolute max rating and 3 V–5.5 V operating range eliminate level-shifters; tPZL ≤ 7.7 ns ensures fast bus release. |
Use Scenario: Driving 8-bit Centronics parallel port signals (DATA[0:7]) from modern MCU to legacy printers or CNC controllers. IC Role / Device Role / Timing Role: High-current 3-state outputs sink/source 24 mA to meet IEEE 1284 Type-A voltage/current requirements for unidirectional mode. Use Value: VOL ≤ 0.44 V at IOL = 24 mA guarantees valid LOW recognition under full load; 4 pF Ci minimizes capacitive loading on MCU GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC240PW | Same AC logic family, identical 24-pin TSSOP package, but features non-inverting/inverting dual 4-bit configuration (1A/2A inverted, 1B/2B non-inverted). | Requires logic inversion upstream or downstream if strict inverting behavior is required; otherwise pin-compatible drop-in for mixed-signal bus driving. | Select SN74AC240PW only when system design accommodates configurable polarity or needs mixed inverting/non-inverting outputs on same bus segment. |
| 74LCX240MTCX | Lower-voltage optimized (2.0 V–3.6 V), 24 mA drive at 3.3 V, but not rated for 5 V operation; uses different pinout (GND/VCC positions differ). | Not suitable for 5 V legacy interfaces; requires redesign of power and signal referencing; lacks 500 mA latch-up immunity spec. | Choose 74LCX240MTCX only for new 3.3 V-only designs where ultra-low static current (<1 µA) and reduced dynamic power outweigh compatibility needs. |
Compared with SN74AC240PW and 74LCX240MTCX, the 74AC11240PWRE4 uniquely provides dual inverting sections with identical OE polarity, full 5 V tolerance, and proven industrial temperature reliability - making it the preferred choice for retrofitting or maintaining 5 V bus architectures requiring strict polarity consistency and noise resilience.
Availability
74AC11240PWRE4 is available at Aetrix Electronics and suitable for memory subsystem buffering, clock distribution networks, ISA/PCI interface bridging, and legacy parallel port driver applications requiring stable component supply across extended product lifecycles.
Supply support for 74AC11240PWRE4 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability digital interface ICs.
The 74AC logic family was engineered for high-speed, low-noise, 5 V CMOS-compatible bus interfacing - targeting industrial control, computing infrastructure, and instrumentation where timing precision and signal integrity are critical.
FAQ
What is the maximum operating supply voltage for the 74AC11240PWRE4?
The 74AC11240PWRE4 has an absolute maximum supply voltage rating of 6 V, but its recommended operating range is 3 V to 5.5 V. Operation above 5.5 V voids parametric guarantees and risks permanent damage; sustained use at 5.5 V is validated for full temperature range and timing compliance.
Does the 74AC11240PWRE4 support mixed-voltage interfacing, such as 3.3 V inputs driving a 5 V-powered device?
Yes - the 74AC11240PWRE4 accepts input voltages from 0 V to VCC + 0.5 V, so 3.3 V logic signals are fully compatible when VCC = 5 V. Its VIH(min) = 3.15 V at VCC = 4.5 V ensures reliable recognition of 3.3 V HIGH levels without level shifters.
How does the flow-through pin architecture of the 74AC11240PWRE4 improve PCB layout?
The 74AC11240PWRE4 arranges inputs on one side (pins 1–4, 10–13) and corresponding inverted outputs on the opposite side (pins 6–9, 15–18), enabling straight trace routing without layer changes or vias - reducing parasitic inductance and simplifying high-density board design.
Is the 74AC11240PWRE4 pin-compatible with other 24-pin TSSOP octal buffers like the 74AC240?
No - although both use TSSOP-24 packages, the 74AC11240PWRE4 has dedicated GND pins (19–22) and dual VCC pins (23–24) in center positions, whereas the 74AC240 uses corner-placed power pins. Pin functions also differ: 74AC11240PWRE4 has two independent OE inputs, while 74AC240 uses shared or complementary OE schemes.
What is the thermal performance of the 74AC11240PWRE4 in the PW (TSSOP) package?
In the PW package, the 74AC11240PWRE4 has a maximum power dissipation of 0.65 W at TA = 55°C in still air. Its thermal resistance θJA is approximately 150°C/W, and the exposed pad (though non-electrical) aids heat conduction through solder mask-defined land patterns - enabling reliable operation at full drive strength in compact enclosures.
74AC11240PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, 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:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74AC11240PWRE4 FAQ
1.How can I place an order for 74AC11240PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11240PWRE4 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 74AC11240PWRE4 reliable?
The price and inventory of 74AC11240PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11240PWRE4 is usually 5 days.
3.What payment methods are accepted for 74AC11240PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11240PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11240PWRE4?
74AC11240PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11240PWRE4 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 74AC11240PWRE4?
For technical support, including 74AC11240PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11240PWRE4 requirements.
6.How does Aetrix verify that 74AC11240PWRE4 is sourced from the original manufacturer or authorized distributors?
All 74AC11240PWRE4 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 74AC11240PWRE4 meets industry standards.
7.What is the process for return or replacement of 74AC11240PWRE4?
All 74AC11240PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11240PWRE4, 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 74AC11240PWRE4 part is unused and in its original packaging.
Return procedure for 74AC11240PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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