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STMicroelectronics M74HC4518RM13TR
- Part No.:
- M74HC4518RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Counters, Dividers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M74HC4518RM13TR.pdf
- Description:
- IC DECADE COUNTER DL 4BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,407
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Product details
Overview
M74HC4518RM13TR from STMicroelectronics is a high-speed CMOS dual 4-bit binary counter with independent clock/enable inputs, asynchronous active-low clear, and TSSOP-16 packaging. It operates from 2V to 6V, delivers 60 MHz max clock frequency at 6V, features symmetrical 4 mA output drive, and supports edge-triggered increment on either rising or falling clock edges. Used in digital timing control, frequency division, and address sequencing in industrial logic systems.
For engineers reviewing the M74HC4518RM13TR datasheet, M74HC4518RM13TR pinout, M74HC4518RM13TR application, or M74HC4518RM13TR equivalent, key selection criteria include dual-counter independence, asynchronous reset behavior, propagation delay matching (tPLH ≅ tPHL), noise immunity (28% VCC), and TSSOP-16 thermal/power constraints for dense PCB layouts.
Technical Context
The M74HC4518RM13TR integrates two identical, internally synchronous 4-stage D-type flip-flop counters sharing no internal signal paths-each has dedicated CLOCK, ENABLE, CLEAR, and Q0–Q3 outputs. Clocking is edge-triggered with interchangeable CLOCK/ENABLE polarity control, enabling increment on either rising or falling transitions.
Each counter resets asynchronously via active-low CLEAR, exhibits balanced propagation delays (tPLH ≈ tPHL), and maintains high noise immunity (VIH/VIL = 28% VCC min) across its full 2V–6V supply range. Input protection circuits guard against ESD and transient overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - Enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Max Clock Frequency | 60 MHz (typ.) at VCC = 6 V - Supports high-speed counting in real-time control loops and data sampling clocks. |
| Output Drive Strength | ±4 mA (min) - Sufficient to drive ≥10 LS-TTL loads or multiple CMOS inputs without buffering. |
| Propagation Delay | 18 ns (tPLH/tPHL, typ., VCC = 6 V) - Ensures tight timing margins in cascaded counter chains. |
| Quiescent Current | 4 µA (max, TA = 25°C) - Enables ultra-low-power operation in battery-backed or standby logic subsystems. |
| Noise Immunity | 28% VCC (min) - Guarantees reliable switching under noisy industrial power rail conditions. |
| Input Capacitance | 5 pF (typ.) - Minimizes loading on driving gates and preserves signal integrity at high frequencies. |
Pinout & Package
TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free, moisture-sensitive level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | 1CLOCK / 2CLOCK | Edge-triggered clock inputs; rising or falling edge increments counter depending on ENABLE state. |
| 2, 10 | 1ENABLE / 2ENABLE | Enable/disable counting per counter; LOW allows increment on clock edge, HIGH holds count. |
| 3–6, 11–14 | 1Q0–1Q3 / 2Q0–2Q3 | Active-high binary outputs (Q0 = LSB); each counter provides independent 4-bit parallel readout. |
| 7, 15 | 1CLEAR / 2CLEAR | Asynchronous active-low reset; forces all Qn outputs LOW immediately, overriding clock/enable. |
| 8 | GND | Digital ground reference; must be low-impedance connection to minimize switching noise coupling. |
| 16 | VCC | Positive supply input; requires local 100 nF ceramic decoupling within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent counters | Two fully isolated 4-bit binary counters on one die-no shared control logic enables flexible partitioned timing. |
| Configurable edge sensitivity | CLOCK/ENABLE interchangeability allows rising- or falling-edge counting without external inverters. |
| Asynchronous reset | Active-low CLEAR pins reset outputs within 16 ns (VCC = 6 V), critical for deterministic system initialization. |
| High noise margin | 28% VCC input threshold ensures robust operation in electrically noisy factory-floor environments. |
| Low dynamic power | 38 pF CPD and 4 µA ICC enable <1 mW typical power at 1 MHz, suitable for thermally constrained modules. |
Applications
| Industrial PLC Timing Modules | Digital Panel Meter Counting |
|---|---|
Use Scenario: Precise cycle counting and time-slot allocation in programmable logic controller scan cycles. IC Role / Device Role / Timing Role: Dual counter provides synchronized event capture (e.g., input pulse train + watchdog timeout) with independent reset control. Use Value: Asynchronous CLEAR ensures deterministic zero-reset across both counters during mode transitions, eliminating metastability risk. | Use Scenario: Accumulating sensor pulses (e.g., flow meter, encoder) while simultaneously tracking display update intervals. IC Role / Device Role / Timing Role: One counter tallies external pulses; the other generates fixed-period display refresh strobes via ripple cascade. Use Value: Edge-configurable clocking allows direct use of raw encoder signals without external Schmitt triggers or inverters. |
| Test Equipment Frequency Dividers | Legacy Bus Address Generators |
Use Scenario: Generating sub-harmonic clocks (e.g., 10 MHz → 10 kHz) for precision waveform synthesis stages. IC Role / Device Role / Timing Role: Cascaded ripple-mode operation using Q4→ENABLE linkage achieves divide-by-10 or divide-by-16 ratios. Use Value: Matched tPLH/tPHL delays ensure minimal duty-cycle distortion across decades of division. | Use Scenario: Generating sequential memory-mapped I/O addresses in microcontroller peripheral expansion. IC Role / Device Role / Timing Role: Counter outputs directly drive lower address bits; ENABLE controlled by chip-select logic for bank selection. Use Value: 2V–6V operation supports direct interfacing with both 3.3 V MCUs and legacy 5 V bus architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual binary counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC393DR | Identical dual 4-bit binary architecture but lacks ENABLE input per counter; clock enable implemented externally. | Requires additional gate logic for gated counting; less flexible in dynamic enable scenarios. | Prefer when board space permits external gating and cost is primary constraint. |
| CD74HC4040M96 | Single 12-bit ripple counter; no dual independent sections or per-counter ENABLE/CLEAR. | Suitable only for monolithic divide-by-N; cannot support parallel dual-timing tasks. | Select only for simple high-ratio division where dual-channel isolation is unnecessary. |
Compared with SN74HC393DR and CD74HC4040M96, the M74HC4518RM13TR uniquely supports per-counter enable gating and asynchronous reset-critical for applications requiring independent timing domains on a single IC.
Availability
M74HC4518RM13TR is available at Aetrix Electronics and suitable for industrial PLC timing modules, digital panel meter counting, test equipment frequency dividers, and legacy bus address generators requiring stable component supply and long-term obsolescence management.
Supply support for M74HC4518RM13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and discrete components for industrial, automotive, and consumer markets.
The M74HC4518 belongs to ST's legacy HC logic family-engineered for pin- and function-compatibility with industry-standard 74-series logic while delivering enhanced speed, noise immunity, and supply flexibility.
FAQ
What is the maximum operating temperature range for the M74HC4518RM13TR?
The M74HC4518RM13TR is rated for operation from –55 °C to +125 °C, validated per STMicroelectronics' recommended operating conditions. This extended range supports deployment in harsh industrial enclosures and under-hood automotive auxiliary systems where ambient temperatures exceed standard commercial limits.
Can the two counters be operated at different clock frequencies?
Yes-the M74HC4518RM13TR's counters are electrically isolated with separate CLOCK, ENABLE, and CLEAR inputs. Each can accept independent clock sources up to 60 MHz (at VCC = 6 V), enabling simultaneous operation at mismatched frequencies such as 1 MHz and 25 MHz for multi-rate timing tasks.
Is the TSSOP-16 package RoHS-compliant and lead-free?
Yes-the M74HC4518RM13TR uses a lead-free, RoHS-compliant TSSOP-16 package (mechanical code: c E b A2 A E1 D). It meets JEDEC J-STD-020D moisture sensitivity level 1 and requires no special baking prior to reflow soldering.
How does the ENABLE input affect counter behavior when held LOW?
When ENABLE is held LOW, the counter advances on every valid clock edge (rising or falling, depending on configuration), regardless of prior state. This differs from HIGH-enable logic: ENABLE LOW enables counting; ENABLE HIGH freezes the current count-verified in the truth table on page 2 of the datasheet.
M74HC4518RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Counter, Decade
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- -
- Count Rate:
- 60 MHz
- Trigger Type:
- Positive, Negative
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
M74HC4518RM13TR FAQ
1.How can I place an order for M74HC4518RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC4518RM13TR 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 M74HC4518RM13TR reliable?
The price and inventory of M74HC4518RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC4518RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC4518RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC4518RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC4518RM13TR?
M74HC4518RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC4518RM13TR 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 M74HC4518RM13TR?
For technical support, including M74HC4518RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC4518RM13TR requirements.
6.How does Aetrix verify that M74HC4518RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC4518RM13TR 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 M74HC4518RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC4518RM13TR?
All M74HC4518RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC4518RM13TR, 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 M74HC4518RM13TR part is unused and in its original packaging.
Return procedure for M74HC4518RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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