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Texas Instruments CD74HC4515EG4
- Part No.:
- CD74HC4515EG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-DIP (0.600", 15.24mm)
- Datasheet:
-
CD74HC4515EG4.pdf
- Description:
- IC DECODER/DEMUX 1X4:16 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
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Product details
Overview
CD74HC4515EG4 from Texas Instruments is a high-speed CMOS 4-to-16 line decoder/demultiplexer with input latches, functioning as a binary-to-1-of-16 decoder or 1-to-16 demultiplexer. It features active-low enable (E), latch-enable (LE) control, and outputs low when selected - distinguishing it from the CD74HC4514's high-active outputs. Operates from 2V to 6V, supports -55°C to +125°C, and drives up to 10 LSTTL loads in standard output configuration.
For engineers reviewing the CD74HC4515EG4 datasheet, CD74HC4515EG4 pinout, CD74HC4515EG4 application, or CD74HC4515EG4 equivalent, key selection criteria include its active-low decoded output logic, latch-controlled address hold behavior, wide temperature range suitability for aerospace/military systems, and compatibility with HC-series noise immunity (NIL/NIH = 30% of VCC at 5V).
Technical Context
The CD74HC4515EG4 integrates a 4-bit strobed latch and 4-to-16 decoder in a single monolithic silicon gate structure. Its latch-enable (LE) input controls transparent vs. latched operation: LE high passes A0–A3 changes directly to the decoder; LE low freezes the last valid output state (all outputs low when enabled). The E input serves dual roles - as enable (active-low) for decoding and as data input for demultiplexing.
Propagation delays are specified across voltage and temperature: at VCC = 4.5V and -55°C to +125°C, select-to-output delay is ≤69 ns, LE-to-output ≤56 ns, and E-to-output ≤44 ns (CL = 50pF). Input rise/fall times are constrained to ≤500 ns at 4.5V, ensuring reliable timing margins in synchronous address-selection systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 4-to-16 decoder / 1-to-16 demultiplexer with latched inputs and active-low outputs |
| Supply Voltage Range | 2V to 6V - enables direct interface with 3.3V and 5V logic domains without level shifters |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial, automotive under-hood, and military applications |
| Output Drive | 10 LSTTL loads - sufficient to drive legacy TTL bus loads without buffering |
| Propagation Delay (4.5V) | ≤69 ns max (select-to-output) - supports address decoding in sub-15 MHz synchronous systems |
| Noise Immunity | NIL = NIH = 30% of VCC at 5V - robust against supply and crosstalk noise in dense PCB layouts |
| Input Capacitance | 10 pF - minimizes loading on upstream drivers and preserves signal edge integrity |
Pinout & Package
CD74HC4515EG4 is supplied in a 24-pin plastic dual-in-line package (PDIP), with 0.300-inch body width and through-hole mounting. Pin 1 is located at the top-left corner with notch or dot marking; pin count and spacing conform to JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LE) | Latch Enable | High = transparent mode (outputs follow A0–A3); Low = latched mode (outputs hold prior state) |
| 2–5 (A0–A3) | Binary Address Inputs | 4-bit latch inputs selecting one of 16 outputs; interpreted as unsigned integer (0–15) |
| 6–11, 13–23 (Y0–Y15) | Active-Low Decoded Outputs | Exactly one output goes low when E = 0 and LE = 1; all remain high otherwise (CD74HC4515-specific behavior) |
| 12 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-impedance |
| 24 (VCC) | Positive Supply | Power rail for HC-family operation; requires local 0.1 µF ceramic decoupling adjacent to pin |
| 23 (E) | Enable / Data Input | Active-low enable for decoding; used as serial data input during demultiplexing mode |
Key Features
| Feature | Design Value |
|---|---|
| Strobed input latching | LE input allows synchronous capture of address bits, eliminating race conditions in dynamic bus systems |
| Active-low decoded outputs | Y0–Y15 assert low on selection - directly compatible with enable inputs of 74-series peripherals and reset lines |
| Wide VCC tolerance (2V–6V) | Supports mixed-voltage system integration and brown-out resilience down to 2V operation |
| High noise immunity (30% VCC) | Reduces false triggering in electrically noisy environments such as motor control or power supply sections |
| Low quiescent current (≤160 µA) | Enables use in battery-backed or low-power standby modes without significant leakage penalty |
Applications
| Industrial PLC I/O Expansion | Aerospace Avionics Bus Decoding |
|---|---|
|
Use Scenario: Expanding discrete I/O points in programmable logic controllers using a shared address/data bus. IC Role / Device Role / Timing Role: Decoder selects one of 16 peripheral ICs (ADCs, DACs, GPIO expanders) via 4-bit address; LE synchronizes to CPU write strobe. Use Value: Eliminates need for external address latches; active-low outputs directly drive enable pins of downstream devices without inverters. |
Use Scenario: Routing command signals across redundant avionics data buses with strict timing and radiation-tolerant requirements. IC Role / Device Role / Timing Role: Demultiplexer routes serial control commands to 16 flight-critical subsystems; E input carries command data, A0–A3 carry destination address. Use Value: -55°C to +125°C rating ensures operation in unheated bays; latch function prevents spurious output transitions during bus arbitration. |
| Military Communication System Addressing | Test Equipment Channel Selection |
|
Use Scenario: Selecting antenna array elements or RF front-end modules in secure tactical radios operating across extreme ambient temperatures. IC Role / Device Role / Timing Role: Binary decoder maps microcontroller address lines to individual RF switch control lines; E enables/disables entire array. Use Value: 10 LSTTL load drive supports direct interfacing with legacy RF switch drivers; HC logic reduces power vs. LS-TTL alternatives. |
Use Scenario: Configuring multi-channel automated test equipment (ATE) to route stimulus signals to specific DUT pins. IC Role / Device Role / Timing Role: Latched decoder holds channel selection during measurement cycles, isolating address changes from ongoing analog acquisition. Use Value: Propagation delay ≤69 ns ensures deterministic channel switching within 100 ns timing windows; low output capacitance minimizes signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC4514E | Identical pinout and latch/enable architecture, but outputs go HIGH when selected (complementary logic polarity) | Requires inverted enable logic or external inverters to match CD74HC4515EG4's active-low output behavior | Select when downstream devices require active-high enable inputs or when redesign permits logic inversion |
| SN74HC154N | Same 4-to-16 decode function but no input latches; E input is active-low enable only (no demux data path) | Lacks LE-controlled latching and E-as-data capability - unsuitable for synchronous address capture or demultiplexing use cases | Choose only for simple static decoding where address stability is guaranteed externally |
Compared with CD74HC4515EG4, CD74HC4514E offers identical timing and packaging but inverted output polarity, requiring circuit-level adaptation; SN74HC154N provides basic decoding without latching or demux functionality, limiting its utility in systems needing synchronized address hold or data routing.
Availability
CD74HC4515EG4 is available at Aetrix Electronics and suitable for industrial PLC expansion, aerospace avionics bus decoding, and military communication system addressing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC4515EG4 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 decades of heritage in high-reliability logic families including the HC series.
The CD74HC4515EG4 belongs to TI's High-Speed CMOS Logic family, designed specifically for robust, low-power decoding and demultiplexing in harsh-environment applications demanding wide temperature operation and noise immunity.
FAQ
What is the key functional difference between CD74HC4515EG4 and CD74HC4514E?
The CD74HC4515EG4 asserts selected outputs LOW (active-low), while CD74HC4514E asserts them HIGH (active-high). Both share identical pinout, latch/enable architecture, timing specs, and temperature range. This polarity difference determines compatibility with downstream enable/reset inputs - CD74HC4515EG4 interfaces directly with active-low enables, whereas CD74HC4514E suits active-high control paths. The CD74HC4515EG4 datasheet confirms Yx = 0 (low) for the addressed output when E = 0 and LE = 1.
Does CD74HC4515EG4 support demultiplexing, and how is it configured?
Yes, CD74HC4515EG4 supports 1-to-16 demultiplexing by using the E input as the serial data line and A0–A3 as the 4-bit address. When LE is held high, the device operates transparently: the logic level present on E appears at the output corresponding to the current A0–A3 value. This mode enables time-division routing of a single control signal to any of 16 destinations - a capability explicitly documented in the functional description and truth table of the CD74HC4515EG4 datasheet.
What is the maximum clock/data toggle rate supported by CD74HC4515EG4?
The CD74HC4515EG4 does not operate on a clock signal but responds to asynchronous input edges. Its maximum usable toggle rate is governed by propagation delay and input transition time limits: at VCC = 4.5V and over -55°C to +125°C, the worst-case select-to-output delay is 69 ns, and input rise/fall times must not exceed 500 ns. This supports reliable operation with address changes occurring no faster than ~10 MHz in worst-case thermal conditions - verified in the switching specifications table of the CD74HC4515EG4 datasheet.
Can CD74HC4515EG4 be used in a 3.3V system?
Yes, CD74HC4515EG4 is fully specified for operation from 2V to 6V, including 3.3V nominal supply. At VCC = 3.3V, input thresholds scale proportionally (VIH ≈ 2.31V, VIL ≈ 0.99V), and output drive remains compliant with LVTTL and 3.3V CMOS logic families. The device's 30% noise margin (NIL/NIH) and 10 pF input capacitance ensure clean interfacing in mixed-voltage 3.3V systems - confirmed in the DC and AC electrical specifications of the CD74HC4515EG4 datasheet.
Is CD74HC4515EG4 RoHS compliant?
Yes, CD74HC4515EG4 is RoHS compliant. Per TI's Packaging Information Addendum, the part number CD74HC4515EN (PDIP variant matching EG4 suffix in form factor and specification) carries "RoHS: Yes" and "Lead finish/NIPDAU" designation. The EG4 suffix denotes the same PDIP package as EN, and TI's official documentation confirms RoHS compliance for all active SOIC and PDIP variants of CD74HC4515 released after 2006 - consistent with CD74HC4515EG4's manufacturing timeline and environmental markings.
CD74HC4515EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 24-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 4:16
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
CD74HC4515EG4 FAQ
1.How can I place an order for CD74HC4515EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC4515EG4 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 CD74HC4515EG4 reliable?
The price and inventory of CD74HC4515EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC4515EG4 is usually 5 days.
3.What payment methods are accepted for CD74HC4515EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC4515EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC4515EG4?
CD74HC4515EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC4515EG4 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 CD74HC4515EG4?
For technical support, including CD74HC4515EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC4515EG4 requirements.
6.How does Aetrix verify that CD74HC4515EG4 is sourced from the original manufacturer or authorized distributors?
All CD74HC4515EG4 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 CD74HC4515EG4 meets industry standards.
7.What is the process for return or replacement of CD74HC4515EG4?
All CD74HC4515EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC4515EG4, 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 CD74HC4515EG4 part is unused and in its original packaging.
Return procedure for CD74HC4515EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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