STMicroelectronics STM795RM6E

Overview

STM795RM6E from STMicroelectronics is a 3 V industrial-grade microprocessor supervisor IC with battery switchover, chip enable gating, and dual reset outputs (active-low RST and open-drain active-high RST). It guarantees reset assertion down to VCC = 1.0 V, delivers 7 ns max propagation delay for chip enable control, and supports external low-power SRAM non-volatilization in power-loss scenarios. Used in embedded systems requiring reliable power monitoring and SRAM backup.

For engineers reviewing the STM795RM6E datasheet, STM795RM6E pinout, STM795RM6E application, or STM795RM6E equivalent, key selection criteria include its unique chip enable gating function (absent in STM690/704/802), absence of watchdog and power-fail comparator (unlike STM690/802/804), and SO8 package compatibility with LPSRAM interface timing constraints.

Technical Context

The STM795 implements a precision voltage monitor with 2.63 V ±1.5% reset threshold and internal 200 ms reset timeout (trec) generator. Its dual reset outputs serve distinct roles: push-pull RST for MCU reset assertion and open-drain RST for shared-bus signaling or level translation.

Chip enable gating is implemented via E (input) and ECON (conditioned output), where ECON goes low only when E is low *and* reset is de-asserted - enabling controlled SRAM access during valid system operation. Vccsw provides a push-pull switch control signal for external PMOS transistors to extend current capability beyond the 75 mA internal VOUT switch limit.

Key Specifications

Pinout & Package

STM795RM6E is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package, compliant with JEDEC MS-012, with 1.27 mm pitch and surface-mount footprint. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisor-with-SRAM-gating applications.

Compared with STM795RM6E, STM795T6F offers identical functionality in a smaller package but requires layout revision, while MAX691ACPE+ adds watchdog and PFI/PFO at the cost of losing chip enable gating and increasing pin count - making it suitable only when those extra features outweigh the loss of precise SRAM access control.

Availability

STM795RM6E is available at Aetrix Electronics and suitable for industrial PLC memory backup, medical device data retention, and smart meter real-time clock support requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for STM795RM6E 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STM795 belongs to ST's supervisor IC product line, engineered specifically for robust non-volatile SRAM interfacing in power-critical embedded systems - emphasizing precise reset timing, ultra-low battery drain, and integrated enable control.

FAQ

What is the function of the ECON pin on STM795RM6E?

ECON is a conditioned chip enable output that goes low only when both the E input is low *and* the reset signal is inactive. This ensures external LPSRAM is gated off during reset assertion or when E is high, preventing invalid writes. Its open-drain structure allows wired-OR configurations and level shifting, and it features 7 ns max propagation delay from E to ECON for timing-critical SRAM interfaces.

Does STM795RM6E include a watchdog timer?

No. The STM795RM6E does not include a watchdog timer - this feature is explicitly excluded per the datasheet (Section 2.3: "NOT available on STM704/795/806"). Unlike STM690 or STM802, it relies on external MCU or system-level watchdog supervision. The WDI pin is absent on STM795; pin 7 is assigned to RST, not WDI.

Can STM795RM6E be used without a backup battery?

Yes. When no battery is used, connect both VBAT and VOUT pins to the main VCC rail. The device operates normally as a reset supervisor with chip enable gating, and VOUT remains tied to VCC. Battery switchover circuitry is disabled, but all other functions - including RST assertion, E/ECON gating, and Vccsw signaling - remain fully operational.

What is the maximum load current supported on the VOUT pin?

VOUT supports up to 75 mA continuous output current when sourcing from VCC or VBAT. For higher current demands, the Vccsw pin provides a push-pull control signal to drive an external PMOS transistor in series with VOUT, effectively extending the current capability beyond the internal switch limit while maintaining synchronized switchover behavior.