El SLG7NT4198V de Renesas (antes Silego Technology) es un generador de interrupciones de 1 Hz en un encapsulado TDFN de 8 patillas (2\u00d72 mm). Funciona con una alimentaci\u00f3n de 3,0-V a 3,6-V con una corriente de alimentaci\u00f3n de s\u00f3lo 30-\u00b5A. El dispositivo genera una se\u00f1al de interrupci\u00f3n peri\u00f3dica de 1 Hz para las funciones de activaci\u00f3n y temporizaci\u00f3n del sistema, integrando un oscilador de precisi\u00f3n y l\u00f3gica sin necesidad de componentes de temporizaci\u00f3n externos. Incluye una salida de puerta NMI, entrada de alimentaci\u00f3n, entrada de referencia de tensi\u00f3n externa y salidas de reset\/reloj SMC. El rango de temperatura de funcionamiento es de -40\u00b0C a +85\u00b0C. Forma parte de la familia CMIC (CI de se\u00f1al mixta configurable) de Renesas.<\/p>","protected":false},"excerpt":{"rendered":"
The SLG7NT4198V from Renesas (formerly Silego Technology) is a 1-Hz interrupt generator in an 8-pin TDFN (2\u00d72 mm) package. It operates from a 3.0-V to 3.6-V supply with only 30-\u00b5A supply current. The device generates a periodic 1-Hz interrupt signal for system wake-up and timing functions, integrating a precision oscillator and logic without requiring external […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,29],"tags":[],"chip_brand":[12],"class_list":["post-2039","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-power-management-ics-pmic","chip_brand-renesas"],"acf":{"brief_explanation":"1Hz interrupt generator, 3.0-3.6V, 30\u00b5A Iq, TDFN-8 (2x2mm), -40~85\u00b0C, no external components","date_code":"","package_case":"TDFN-8 with Exposed Pad (2.0 x 2.0 x 0.55 mm, 0.5mm pitch)","in_stock":22000,"datasheet":"https:\/\/www.renesas.com\/us\/en\/document\/dst\/slg7nt4198v-datasheet","price":"$0.20 (1K+ pcs)","product_introduction":"The SLG7NT4198V is a dedicated 1-Hz interrupt generator from Renesas' GreenPAK CMIC (Configurable Mixed-Signal IC) product line, originally designed by Silego Technology (acquired by Renesas in 2017). It provides a low-cost, ultra-small solution for generating periodic system interrupts without requiring a crystal, external oscillator, or MCU timer resource.\n\nThe device integrates an internal precision RC oscillator and divider chain to produce a 1-Hz output signal. The 30-\u00b5A supply current makes it suitable for always-on power management circuits where the main MCU is in sleep mode and needs periodic wake-up. Compared to using an MCU's internal RTC or an external 32-kHz crystal, the SLG7NT4198V eliminates the need for crystal startup time, BOM cost, and firmware timer management.\n\nThe pin configuration is specifically designed for server and embedded system power management. The SENSE input monitors a voltage rail, the MBL_PWRGD_MR_N input receives a power-good signal, and the NMI_GATE output can gate a non-maskable interrupt to the host CPU. The SMC_RST_N and SMC_INIT_CK outputs provide reset and clock signals to the system management controller. The EX_VREF input allows an external voltage reference for the sense comparator.\n\nThe TDFN-8 package measures just 2.0 x 2.0 mm, making it one of the smallest interrupt generator solutions available. The exposed thermal pad on the bottom provides both electrical ground connection and thermal dissipation. MSL-1 rating allows unlimited floor life before soldering.\n\nThis device is typically used in server motherboards, networking equipment, and industrial controllers where a hardware-based 1-Hz heartbeat is needed for watchdog timers, power monitoring, or system health checks independent of software execution.","working_principle":"**Internal Oscillator and Divider:** The SLG7NT4198V contains an on-chip RC oscillator that generates a base frequency, which is divided down through an internal counter chain to produce the 1-Hz output. The oscillator is factory-trimmed for accuracy within the specified tolerance at 3.3 V and 25\u00b0C. The 30-\u00b5A supply current includes the oscillator and all internal logic.\n\n**Interrupt Generation:** The 1-Hz signal drives the interrupt output pin(s) with a fixed duty cycle. The NMI_GATE output can be gated by the SENSE and MBL_PWRGD_MR_N inputs, meaning the 1-Hz interrupt is only passed to the host when the monitored voltage rail and power-good signal are within specification. This provides a hardware-level watchdog \u2014 if the interrupt stops, the host knows the power rail has failed.\n\n**Voltage Monitoring:** The SENSE input connects to an internal comparator (referenced to EX_VREF or an internal reference). When the sensed voltage drops below the threshold, the comparator output modifies the interrupt behavior or triggers the NMI_GATE to assert a non-maskable interrupt to the CPU.\n\n**SMC Interface:** The SMC_RST_N output provides an active-low reset to the System Management Controller, while SMC_INIT_CK provides an initialization clock. These outputs are timed relative to the power-good input to ensure proper sequencing of the management controller during power-up.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | VDD<\/td> | P<\/td> | Supply voltage 3.0-3.6V; bypass with 0.1\u00b5F ceramic to GND; powers internal oscillator and logic<\/td><\/tr> | ||||||||||||||||||||||||
| 2<\/td> | NMI_GATE<\/td> | O<\/td> | Non-maskable interrupt gate output; driven by 1-Hz interrupt when SENSE and MBL_PWRGD inputs are valid; connects to host CPU NMI pin<\/td><\/tr> | ||||||||||||||||||||||||
| 3<\/td> | MBL_PWRGD_MR_N<\/td> | I<\/td> | Power-good input (active low); when low, indicates main power is good; gates the NMI output; connect to system power-good signal<\/td><\/tr> | ||||||||||||||||||||||||
| 4<\/td> | SENSE<\/td> | I<\/td> | Voltage sense input; monitors a supply rail via resistor divider; compared against EX_VREF or internal reference; affects NMI gating<\/td><\/tr> | ||||||||||||||||||||||||
| 5<\/td> | GND<\/td> | G<\/td> | Ground; connect to PCB ground plane and exposed pad<\/td><\/tr> | ||||||||||||||||||||||||
| 6<\/td> | SMC_INIT_CK<\/td> | O<\/td> | System Management Controller initialization clock output; provides clock pulse during power-up sequence<\/td><\/tr> | ||||||||||||||||||||||||
| 7<\/td> | SMC_RST_N<\/td> | O<\/td> | SMC reset output (active low); asserted during power-up until supplies are stable; released when MBL_PWRGD is valid<\/td><\/tr> | ||||||||||||||||||||||||
| 8<\/td> | EX_VREF<\/td> | I<\/td> | External voltage reference input for SENSE comparator; if unused, connect to VDD or leave per datasheet; sets SENSE threshold<\/td><\/tr> | ||||||||||||||||||||||||
| Pad<\/td> | Exposed Pad<\/td> | G<\/td> | Thermal\/ground pad; must be soldered to PCB ground plane for electrical ground and thermal dissipation<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|