STMicroelectronics STM795RM6F

Overview

STM795RM6F from STMicroelectronics is a 3 V industrial-grade microprocessor supervisor IC with integrated battery switchover, chip enable gating, and active-low reset output. It monitors VCC for out-of-tolerance conditions (reset threshold = 2.93 V), asserts RST for ≥200 ms (typ), provides 7 ns max propagation delay for chip enable control, and operates from –40 °C to +85 °C. It is used in embedded systems requiring non-volatile SRAM backup during main power loss.

For engineers reviewing the STM795RM6F datasheet, STM795RM6F pinout, STM795RM6F application, or STM795RM6F equivalent, key selection criteria include guaranteed RST assertion down to VCC = 1.0 V, open-drain RST output behavior, chip enable gating timing (7 ns max), battery switchover hysteresis, and absence of watchdog timer or power-fail comparator functions.

Technical Context

The STM795RM6F implements a precision voltage monitor with 2.93 V ±1.5% reset threshold and internal 200 ms reset timeout generator. Its dedicated chip enable gating circuit accepts E input and delivers conditioned ECON output only when reset is de-asserted and E is low - enabling controlled LPSRAM access during valid system operation.

It features automatic VCC-to-VBAT switchover at 2.4 V (VSW) with hysteresis, VCCSW push-pull output for driving external PMOS switches, and dual-supply operation where VBAT may exceed VCC. Unlike other family members, it omits watchdog timer and PFI/PFO functions but retains MR input and open-drain RST output.

Key Specifications

Pinout & Package

STM795RM6F is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, compliant with JEDEC MS-012. Pin 1 is marked with a dot or notch; device orientation follows standard SO8 conventions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisor applications.

Compared with STM795RM6F, STM795TTR offers identical supervision and gating performance in a smaller footprint, while STM805RWD trades chip enable control for power-fail detection - making it unsuitable for LPSRAM-gated systems but viable where brownout warning precedes reset.

Availability

STM795RM6F is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STM795RM6F 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM690/704/795/802/804/805/806 product line targets robust microprocessor supervision in resource-constrained embedded systems, emphasizing low-power battery backup, precise reset timing, and configurable interface control for external memory.

FAQ

Does STM795RM6F include a watchdog timer?

No. The STM795RM6F explicitly omits watchdog timer functionality, as confirmed in Section 2.3 of the datasheet ("Watchdog input (NOT available on STM704/795/806)"). This distinguishes it from STM690, STM802, STM804, and STM805 variants, which integrate a 1.6 s typ watchdog timer triggered by WDI pin transitions.

What is the function of the ECON pin?

ECON is a conditioned chip enable output that goes low only when both E (chip enable input) is low and reset is inactive. It remains low for 15 µs or until E returns high - whichever occurs first - ensuring clean, glitch-free gating of external LPSRAM write operations during valid system states.

Can VBAT exceed VCC on STM795RM6F?

Yes. The datasheet explicitly states "VBAT may exceed VCC" (Section 1.1.11). The internal switchover MOSFET isolates VCC and VBAT paths, allowing safe use of higher-voltage backup sources such as 3.6 V lithium batteries without risk of back-feeding the main supply rail.

Is PFI/PFO functionality present on STM795RM6F?

No. Table 1 and Section 2.8 confirm PFI/PFO is "NOT available on STM795". Pin 1 (PFO) is a no-connect (NC) on this variant. Power-fail detection capability is reserved for STM690, STM704, STM802, STM804, STM805, and STM806 devices only.