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Microchip Technology MIC1555YMU-TR
- Part No.:
- MIC1555YMU-TR
- Manufacturer:
- Microchip Technology
- Category:
- Programmable Timers and Oscillators
- Package:
- 10-XFDFN Exposed Pad
- Datasheet:
-
MIC1555YMU-TR.pdf
- Description:
- IC OSC SINGLE TIMER 5MHZ UTMLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,907
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Product details
Overview
MIC1555YMU-TR from Microchip Technology is a rail-to-rail CMOS RC timer/oscillator in a 10-pin ultra-thin UTDFN (2 mm × 2 mm × 0.4 mm) package, supporting monostable and astable operation with separate TRG/THR inputs, ±40°C to +85°C ambient range, and 2.7V–18V supply. It delivers precise timing from microseconds to hours for pulse generation, time-delay circuits, and micropower oscillators up to 5 MHz.
For engineers reviewing the MIC1555YMU-TR datasheet, MIC1555YMU-TR pinout, MIC1555YMU-TR application, or MIC1555YMU-TR equivalent, key selection criteria include chip-select–enabled shutdown (<1 μA), threshold-dominant input behavior, 50% square-wave capability with one R/C, <15 Ω output on-resistance, and temperature-stable timing (0.005%/°C).
Technical Context
The MIC1555YMU-TR implements a BiCMOS RS flip-flop architecture with independent trigger (TRG) and threshold (THR) comparators referenced to 1/3VS and 2/3VS, where THR takes precedence over TRG to ensure deterministic output state transitions. Its internal voltage divider sets comparator trip points, enabling stable RC timing across supply and temperature variations.
It features an active-high chip select (CS) input that disables internal bias circuitry to achieve sub-1 μA shutdown current, while retaining full functionality upon re-enablement. The 10-pin UTDFN package integrates dedicated VS, GND, OUT, TRG, THR, and CS terminals with four NC pins - optimized for space-constrained, low-power embedded timing applications requiring minimal external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7 V to +18 V - supports wide-input industrial and battery-powered systems without regulation. |
| Operating Temperature | –40°C to +85°C - qualified for automotive cabin, industrial control, and outdoor electronics environments. |
| Timing Accuracy | ±2% - enables reliable one-shot pulse widths and oscillator frequencies without trimming. |
| Output On-Resistance | <15 Ω - drives 20 mA loads directly with ≤1.25 V drop at 15 V supply, reducing need for external buffers. |
| Shutdown Current | <1 μA - allows long-term battery operation in sleep-mode sensor nodes or intermittent-timing applications. |
| Temp Stability | 0.005%/°C - minimizes drift in precision delay generators across operating temperature range. |
| Supply Stability | 0.055%/V - maintains consistent timing accuracy during unregulated supply fluctuations. |
Pinout & Package
Package: 10-pin Ultra-Thin DFN (UTDFN), 2 mm × 2 mm × 0.4 mm, exposed pad (thermal performance θJA = 90°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VS) | Power Supply Input | Accepts +2.7 V to +18 V; decoupling capacitor required for noise immunity. |
| 2 (CS) | Chip Select / Reset | Active-high enable; forces output low and cuts bias current when low (<1/3VS); must not float. |
| 5 (THR) | Threshold Input | Dominant high-active input (≥2/3VS) that resets output low; overrides TRG state. |
| 6 (TRG) | Trigger Input | Low-active input (≤2/3VS) that sets output high; only effective when THR is inactive. |
| 8 (GND) | Ground Reference | Supply return path; connects to PCB ground plane for thermal and noise control. |
| 10 (OUT) | CMOS Totem-Pole Output | Rail-to-rail switching output capable of sourcing/sinking 20 mA with low on-resistance. |
| 3, 4, 7, 9 | No Connect | Not internally bonded; must remain unconnected per Microchip design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Chip Select–Enabled Shutdown | Reduces quiescent current to <1 μA, enabling battery life extension in intermittently active timing circuits. |
| Threshold-Dominant Input Logic | Ensures deterministic output state by prioritizing THR over TRG, preventing race conditions in monostable edge-triggered designs. |
| Single R/C 50% Square-Wave Generation | Eliminates need for matched resistor networks or external logic to achieve symmetrical oscillation in astable mode. |
| Rail-to-Rail CMOS Output | Delivers full VS swing with low on-resistance, simplifying interface to logic gates, MOSFET gates, or LED drivers without level-shifting. |
| Zero-Leakage Inputs | Input currents <50 nA minimize RC timing errors caused by parasitic discharge, critical for long-duration delays (>1 s). |
Applications
| Precision Time-Delay Generator | Micropower Oscillator |
|---|---|
Use Scenario: Generating accurate, repeatable delays (e.g., 100 ms to 10 s) in sensor wake-up sequencing or power-gating control loops. IC Role / Device Role / Timing Role: Monostable one-shot configured with external R/C; TRG initiates fixed-width pulse; THR terminates it at 2/3VS. Use Value: Achieves ±2% timing accuracy over –40°C to +85°C without calibration, replacing larger discrete timer solutions. | Use Scenario: Providing low-power clock signals (1 kHz–5 MHz) for microcontroller peripherals or display refresh in portable medical devices. IC Role / Device Role / Timing Role: Astable oscillator using single R/C feedback; CS enables/disables output on demand to conserve energy. Use Value: Delivers 50% duty cycle with one resistor and capacitor, reducing BOM count and board area versus traditional 555-based oscillators. |
| Missing Pulse Detector | LED Blinker with Enable Control |
Use Scenario: Monitoring serial data streams or encoder outputs to detect signal loss or stall conditions in motor control systems. IC Role / Device Role / Timing Role: Monostable triggered by each incoming pulse; missing pulse causes timeout and asserts fault flag via OUT. Use Value: Uses zero-leakage inputs to maintain timing integrity over long intervals, avoiding false triggers from input leakage or noise. | Use Scenario: Driving status LEDs in IoT edge nodes where blink pattern must be programmable and power-gated during deep sleep. IC Role / Device Role / Timing Role: Astable oscillator with CS pin tied to MCU GPIO to start/stop blinking; OUT directly sinks LED current. Use Value: Integrates enable control and timing in one device, eliminating discrete transistor switch and saving PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RC timer/oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC1555YM5-TR | 5-pin SOT-23 package; no CS pin; identical core timing function and electrical specs. | Lacks chip-select shutdown; requires external enable logic for power gating. | Select when board space permits larger footprint and shutdown is managed externally. |
| LMC555IMX/NOPB | CMOS 555 variant in SOIC-8; no CS pin; higher supply current (120 μA typ. at 5 V); wider temp range (–40°C to +125°C). | Compatible pinout with legacy NE555 but lacks integrated chip-select; less suitable for ultra-low-power designs. | Select when drop-in replacement for existing 555 layouts is needed and sub-μA shutdown is not required. |
Compared with MIC1555YM5-TR, the MIC1555YMU-TR adds chip-select control in a smaller UTDFN package but requires routing for CS; compared with LMC555IMX/NOPB, it offers superior micropower performance and tighter timing stability, though with different packaging and pin count.
Availability
MIC1555YMU-TR is available at Aetrix Electronics and suitable for precision timer, micropower oscillator, and time-delay generation applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC1555YMU-TR 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
Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and timing solutions, with ISO/TS-16949 and ISO 9001 certifications.
The MIC1555/57 family was designed as ultra-small, low-power replacements for legacy bipolar 555 timers, targeting space- and energy-constrained embedded timing functions in industrial, medical, and portable electronics.
FAQ
What is the primary function of the CS pin on the MIC1555YMU-TR?
The CS (Chip Select) pin on the MIC1555YMU-TR is an active-high digital control input that enables or disables internal bias circuitry. When pulled high (>2/3VS), the device operates normally; when pulled low (<1/3VS), it enters shutdown mode with supply current below 1 μA. This feature makes MIC1555YMU-TR ideal for battery-powered applications requiring on-demand timing activation without external power switches.
Can the MIC1555YMU-TR generate a 50% duty cycle square wave without diodes or additional resistors?
Yes, the MIC1555YMU-TR can generate a precise 50% duty cycle square wave using only one resistor and one capacitor in astable configuration - achieved by connecting TRG to THR and feeding the RC junction back to both inputs. This capability is explicitly confirmed in the datasheet's "50% Square Wave with One Resistor, One Capacitor" feature and functional diagrams, distinguishing it from standard 555 variants requiring two resistors for symmetry.
What is the maximum operating frequency of the MIC1555YMU-TR in astable mode?
The MIC1555YMU-TR supports a maximum astable frequency of 5 MHz under specified conditions: RT = 1 kΩ, CT = 47 pF, and VS = 8 V. This value is documented in Table 1-1 of the DS20005730B datasheet under "Maximum Astable Frequency." Operation above 1 MHz exhibits increased RC multiplier effects due to propagation delay dominance, so layout and component selection become critical for stability.
How does the MIC1555YMU-TR differ from the MIC1557 in terms of functionality?
The MIC1555YMU-TR supports both monostable (one-shot) and astable (oscillator) modes with separate TRG and THR inputs, plus chip-select control. In contrast, the MIC1557 is oscillator-only with a single T/T pin and also includes CS. The MIC1555YMU-TR's dual-mode flexibility and threshold-dominant logic make it suitable for event-triggered timing, whereas the MIC1557 is optimized strictly for continuous oscillation with simpler pinout.
Is the MIC1555YMU-TR pin-compatible with legacy NE555 or LM555 timers?
No, the MIC1555YMU-TR is not pin-compatible with NE555 or LM555 timers. It uses a 10-pin UTDFN package with unique pin assignments including dedicated CS, THR, TRG, and four NC pins - unlike the 8-pin DIP/SOIC layout of legacy 555s. Circuit redesign and PCB layout changes are required for migration; however, its functional equivalence (monostable/astable timing) and improved specs (lower power, better stability) justify the redesign effort in new low-power designs.
MIC1555YMU-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- IttyBitty®
- Package/Case:
- 10-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Programmable Timer
- Count:
- -
- Frequency:
- 5MHz
- Voltage - Supply:
- 2.7V ~ 18V
- Current - Supply:
- 350 µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-UTDFN (2x2)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MIC1555YMU-TR FAQ
1.How can I place an order for MIC1555YMU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC1555YMU-TR 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 MIC1555YMU-TR reliable?
The price and inventory of MIC1555YMU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC1555YMU-TR is usually 5 days.
3.What payment methods are accepted for MIC1555YMU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC1555YMU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC1555YMU-TR?
MIC1555YMU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC1555YMU-TR 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 MIC1555YMU-TR?
For technical support, including MIC1555YMU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC1555YMU-TR requirements.
6.How does Aetrix verify that MIC1555YMU-TR is sourced from the original manufacturer or authorized distributors?
All MIC1555YMU-TR 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 MIC1555YMU-TR meets industry standards.
7.What is the process for return or replacement of MIC1555YMU-TR?
All MIC1555YMU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC1555YMU-TR, 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 MIC1555YMU-TR part is unused and in its original packaging.
Return procedure for MIC1555YMU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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