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SLG7NT4198V

مولد مقاطعة 1 هرتز، 3.0-3.6 فولت، 30 ميجا أمبير Iq، TDFN-8 (2 × 2 مم)، -40 ~ 85 درجة مئوية، بدون مكونات خارجية

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جزء الشركة المصنعة ： جزء الشركة المصنعة

SLG7NT4198V

الحزمة ： الحزمة

TDFN-8 مع وسادة مكشوفة (2.0 × 2.0 × 0.55 مم، 0.5 مم، درجة ميل 0.5 مم)

الوصف

The SLG7NT4198V from Renesas (formerly Silego Technology) is a 1-Hz interrupt generator in an 8-pin TDFN (2×2 mm) package. It operates from a 3.0-V to 3.6-V supply with only 30-µA 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 timing components. Features include an NMI gate output, power-good input, external voltage reference input, and SMC reset/clock outputs. Operating temperature range is -40°C to +85°C. Part of Renesas’ CMIC (Configurable Mixed-Signal IC) family.

مقدمة المنتج:SLG7NT4198V مقدمة المنتج

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.

The device integrates an internal precision RC oscillator and divider chain to produce a 1-Hz output signal. The 30-µA 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.

The 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.

The 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.

This 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.

مبدأ العمل:SLG7NT4198V مبدأ العمل

**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°C. The 30-µA supply current includes the oscillator and all internal logic.

**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 — if the interrupt stops, the host knows the power rail has failed.

**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.

**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.

وصف الدبوس:SLG7NT4198V تعريف الدبوس ووظائفه

دبوس	الاسم	النوع	الوصف
1	VDD	P	Supply voltage 3.0-3.6V; bypass with 0.1µF ceramic to GND; powers internal oscillator and logic
2	NMI_GATE	O	Non-maskable interrupt gate output; driven by 1-Hz interrupt when SENSE and MBL_PWRGD inputs are valid; connects to host CPU NMI pin
3	MBL_PWRGD_MR_N	I	Power-good input (active low); when low, indicates main power is good; gates the NMI output; connect to system power-good signal
4	سينس	I	Voltage sense input; monitors a supply rail via resistor divider; compared against EX_VREF or internal reference; affects NMI gating
5	GND	G	Ground; connect to PCB ground plane and exposed pad
6	SMC_INIT_CK	O	System Management Controller initialization clock output; provides clock pulse during power-up sequence
7	SMC_RST_N	O	SMC reset output (active low); asserted during power-up until supplies are stable; released when MBL_PWRGD is valid
8	EX_VREF	I	External voltage reference input for SENSE comparator; if unused, connect to VDD or leave per datasheet; sets SENSE threshold
الوسادة	وسادة مكشوفة	G	Thermal/ground pad; must be soldered to PCB ground plane for electrical ground and thermal dissipation

Application Scenarios:In which products and applications isSLG7NT4198V مستعمل

التطبيق	الوصف
Server Watchdog Timer	Generate 1-Hz heartbeat interrupt for BMC/SMC watchdog; if software fails to service interrupt, BMC triggers system reset; 30µA Iq allows always-on operation from standby power rail; NMI_GATE only passes interrupt when power is good
Embedded System Wake-Up	Periodically wake MCU from deep sleep at 1-Hz interval; eliminates need for MCU RTC timer; SENSE input ensures wake-up only occurs when monitored rail is within spec; reduces MCU firmware complexity
Power Sequencing Monitor	MBL_PWRGD input gates NMI output based on power-good status; SENSE monitors critical rail voltage; SMC_RST_N and SMC_INIT_CK control management controller power-up; integrates watchdog and sequencing in single 2x2mm device

Alternative Models:What chips are recommended as replacements for SLG7NT4198V

الطراز	الشركة المصنعة	التوافق	الفرق الرئيسي
SLG7NT4192V	رينيساس	Same Series, Different Config	Power-good generator variant of same family; same TDFN-8 package; different output logic; use when power-good generation needed instead of 1-Hz interrupt
DS1375U-33+	ADI (Maxim)	المعادل الوظيفي	32-kHz oscillator with interrupt output; TSSOP-8; requires external 32-kHz crystal; more accurate timing; larger package; use when crystal accuracy needed
TPS3839K33DBVR	TI	Functional Overlap	3.3V voltage supervisor with push-pull reset; SOT-23-3; no 1-Hz interrupt; use when only voltage monitoring needed without periodic interrupt