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Texas Instruments CD74HC540M96
- Part No.:
- CD74HC540M96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HC540M96.pdf
- Description:
- IC BUFFER INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,160
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Product details
Overview
CD74HC540M96 from Texas Instruments is an inverting octal buffer and line driver with three-state outputs, designed for bidirectional bus interfacing in industrial control and data acquisition systems. It operates from 2 V to 6 V, delivers 15 LSTTL load drive capability, exhibits 9 ns typical propagation delay at 5 V/15 pF, and supports –55℃ to 125℃ ambient operation.
For engineers reviewing the CD74HC540M96 datasheet, CD74HC540M96 pinout, CD74HC540M96 application, or CD74HC540M96 equivalent, key selection criteria include its inverting logic function, dual output-enable control (OE1/OE2), SOIC-20 package compatibility, and guaranteed three-state leakage current ≤ ±10 μA over full temperature range.
Technical Context
The CD74HC540M96 implements eight independent inverting buffer channels, each with high-impedance three-state output controlled by two active-low enable inputs (OE1 and OE2). Both enables must be LOW for valid data transmission; either HIGH forces all outputs into high-Z state.
Its HC logic family ensures CMOS-level input thresholds (VIH = 3.15 V min, VIL = 1.35 V max at VCC = 4.5 V), rail-to-rail output swing, and low static current (ICC ≤ 160 μA at 6 V, –55℃ to 125℃), enabling direct replacement of legacy TTL buffers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with three-state outputs - enables bidirectional bus isolation and signal polarity inversion in single device. |
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system integration and battery-powered operation down to 2 V. |
| Propagation Delay | 9 ns typical at VCC = 5 V, CL = 15 pF - ensures timing-critical data path compatibility in 20+ MHz digital interfaces. |
| Output Drive | 15 LSTTL loads - sufficient to drive standard TTL buses without external amplification. |
| Operating Temperature | –55℃ to 125℃ - qualified for aerospace, automotive under-hood, and industrial motor control environments. |
| Three-State Leakage | ±10 μA max at –55℃ to 125℃ - guarantees minimal bus contention current during high-Z mode in hot-swap or multiplexed systems. |
| Input Thresholds | VIH = 3.15 V min, VIL = 1.35 V max at VCC = 4.5 V - provides 30% noise margin against both rails for robust noise immunity. |
Pinout & Package
CD74HC540M96 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.65 mm lead pitch and RoHS-compliant NiPdAu lead finish. It conforms to JEDEC MS-013 and is rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input A0–A7 | Active-HIGH logic inputs driving inverted outputs Y0–Y7; require defined logic levels to prevent floating-induced shoot-through. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Output Y0–Y7 | Inverted buffered outputs; enter high-impedance state when OE1 or OE2 is HIGH - enables shared-bus arbitration. |
| 17, 18 | OE1, OE2 | Active-LOW output enables; either HIGH disables all outputs - dual-enable architecture allows flexible bus partitioning. |
| 19 | VCC | Positive supply rail (2–6 V); requires local 0.1-μF ceramic bypass capacitor per device for stable switching performance. |
| 20 | GND | Ground reference; must be low-impedance connection to minimize ground bounce in multi-driver configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting logic with three-state control | Enables signal inversion and bus contention avoidance in single-package memory/data bus drivers. |
| Dual active-low output enables (OE1/OE2) | Supports hierarchical bus gating - e.g., OE1 for subsystem-level disable, OE2 for channel-level override. |
| 15 LSTTL load drive capability | Eliminates need for external bus transceivers in legacy TTL-compatible backplanes and industrial I/O modules. |
| Wide 2–6 V supply range | Permits direct interface with 3.3 V microcontrollers and 5 V legacy peripherals without voltage translation. |
| –55℃ to 125℃ operating range | Validated for use in extended-temperature applications including avionics data concentrators and power converter monitoring circuits. |
Applications
| Industrial PLC Backplane Interface | Automotive ECU Diagnostic Bus |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to a 16-bit parallel diagnostic bus in an engine control unit, where signal inversion aligns with legacy protocol framing. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, bus isolation, and controlled three-state release during CAN-initiated diagnostics. Use Value: Eliminates discrete inverters and tristate logic gates, reducing BOM count by 3 devices while maintaining <10 ns timing margin on 5 MHz bus clock. | Use Scenario: Driving segmented LED displays and relay drivers from a safety-critical MCU in a commercial vehicle body controller. IC Role / Device Role / Timing Role: Octal buffer with fail-safe high-Z default (via OE1 tied to watchdog reset) ensuring outputs float during fault conditions. Use Value: Prevents unintended actuation during brown-out or reset sequences, meeting ISO 26262 ASIL-B functional safety requirements. |
| Data Acquisition System Multiplexer Control | Test Equipment Signal Routing Matrix |
Use Scenario: Selecting analog front-end channels in a 12-bit, 1 MSPS DAQ module using parallel address decoding. IC Role / Device Role / Timing Role: Inverting address decoder buffer feeding multiplexer select lines; OE2 synchronized to ADC conversion start pulse. Use Value: Guarantees glitch-free channel selection with <15 ns setup/hold margin relative to 100 ns conversion trigger edge. | Use Scenario: Configuring signal paths between DUT ports and measurement instruments in automated test equipment. IC Role / Device Role / Timing Role: Three-state bus driver enabling dynamic reconfiguration of 8-channel analog/digital routing matrix under FPGA control. Use Value: Reduces cross-talk by >25 dB during path reconfiguration via simultaneous OE1/OE2 assertion, verified per IEC 61000-4-3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC240N | Inverting octal buffer with identical SOIC-20 footprint and 2–6 V operation, but uses single OE (active-low) instead of dual OE1/OE2. | Lacks independent subsystem-level gating; requires external logic to replicate dual-enable behavior. | Select when board space is constrained and simplified enable control suffices. |
| CD74HCT540M96 | HCT variant with TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), same pinout and three-state timing, but limited to 4.5–5.5 V supply. | Required only when interfacing directly to legacy 5 V TTL logic without level shifters. | Choose for strict LSTTL input compatibility; avoid if system uses mixed 3.3 V/5 V supplies. |
Compared with SN74HC240N and CD74HCT540M96, CD74HC540M96 uniquely combines dual-output-enable flexibility, wide-voltage operation, and industrial temperature range - making it optimal for modular, field-upgradeable embedded systems requiring robust bus management.
Availability
CD74HC540M96 is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC540M96 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 delivering analog and embedded processing solutions, with over 90 years of innovation in high-reliability logic, power management, and signal chain ICs.
CD74HC540M96 belongs to TI's CD74HC high-speed CMOS logic family, engineered for drop-in replacement of obsolete TTL devices in harsh-environment applications demanding low power, wide voltage tolerance, and guaranteed parametric performance.
FAQ
What is the maximum supply voltage rating for CD74HC540M96?
The absolute maximum supply voltage for CD74HC540M96 is 7 V, but the recommended operating range is 2 V to 6 V per TI's datasheet Section 5.2. Operating continuously above 6 V risks exceeding safe junction temperature and may cause accelerated parametric drift or latent failure. For reliable long-term operation in CD74HC540M96-based designs, maintain VCC within 2–6 V with proper decoupling.
Does CD74HC540M96 support true bidirectional data flow?
No, CD74HC540M96 is a unidirectional inverting buffer - signals flow only from inputs A0–A7 to outputs Y0–Y7. It does not support automatic direction sensing or internal feedback paths. Bidirectional bus operation requires pairing with a complementary non-inverting device like CD74HC541M96 or external control logic to manage OE states and data direction.
How does the dual OE architecture of CD74HC540M96 improve system reliability?
The dual OE1/OE2 inputs in CD74HC540M96 allow independent control of bus segments - for example, OE1 can be driven by a system watchdog timeout signal while OE2 responds to application-layer commands. This prevents unintended bus activation during firmware crashes or power sequencing faults, directly enhancing fault containment in CD74HC540M96-based industrial controllers.
What is the guaranteed three-state leakage current for CD74HC540M96 over temperature?
CD74HC540M96 guarantees three-state output leakage current (IOZ) of ±10 μA maximum across the full –55℃ to 125℃ operating range, as specified in Section 5.4 Electrical Characteristics of the TI datasheet. This low leakage ensures minimal bus loading during high-Z mode, critical for maintaining signal integrity in high-impedance shared-bus architectures.
Can CD74HC540M96 be used with 3.3 V microcontrollers without level shifters?
Yes, CD74HC540M96 operates natively from 2 V to 6 V and features CMOS-compatible input thresholds - at 3.3 V supply, VIH is 2.1 V (min) and VIL is 1.1 V (max), fully compatible with standard 3.3 V logic outputs. No level shifter is needed when interfacing with 3.3 V MCUs, and CD74HC540M96 maintains full timing and drive specifications across this voltage range.
CD74HC540M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74HC540M96 FAQ
1.How can I place an order for CD74HC540M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC540M96 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 CD74HC540M96 reliable?
The price and inventory of CD74HC540M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC540M96 is usually 5 days.
3.What payment methods are accepted for CD74HC540M96?
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4.How is shipping managed for CD74HC540M96?
CD74HC540M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC540M96 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 CD74HC540M96?
For technical support, including CD74HC540M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC540M96 requirements.
6.How does Aetrix verify that CD74HC540M96 is sourced from the original manufacturer or authorized distributors?
All CD74HC540M96 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 CD74HC540M96 meets industry standards.
7.What is the process for return or replacement of CD74HC540M96?
All CD74HC540M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC540M96, 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 CD74HC540M96 part is unused and in its original packaging.
Return procedure for CD74HC540M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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