STMicroelectronics STM795TM6F

Overview

STM795TM6F from STMicroelectronics is a 3 V supply voltage supervisor IC with integrated battery switchover and chip-enable gating for external low-power static RAM (LPSRAM). It provides active-low RST output, manual reset input (MR), VCC switch output (Vccsw), and conditioned chip-enable output (ECON) with 7 ns max propagation delay. Designed for industrial-grade embedded systems requiring non-volatile SRAM retention during power loss, it operates from –40 °C to 85 °C with guaranteed RST assertion down to VCC = 1.0 V.

For engineers reviewing the STM795TM6F datasheet, STM795TM6F pinout, STM795TM6F application, or STM795TM6F equivalent, key selection criteria include its unique chip-enable gating function (absent in STM690/704/802/804/805/806), open-drain RST output configuration, Vccsw-controlled external PMOS switching, and absence of watchdog timer and power-fail comparator - making it distinct within the STM supervisory family.

Technical Context

The STM795 implements a precision voltage monitor with reset threshold VRST ≈ 2.93 V (typ), switchover voltage VSW = 2.4 V, and hysteresis enabling clean VCC-to-VBAT transition. Its E/ECON logic gates LPSRAM access only when reset is de-asserted and chip-enable is active, preventing inadvertent writes during power-up/down sequences.

Unlike other members of the STM690–STM806 family, the STM795 omits both watchdog timer and PFI/PFO circuitry but adds dedicated E (chip-enable input) and ECON (conditioned enable output) pins with 15 µs minimum hold time after reset release. Its Vccsw output drives external high-current PMOS switches, supporting IOUT > 75 mA beyond the internal 75 mA VOUT capability.

Key Specifications

Pinout & Package

STM795TM6F is housed in an 8-pin SO8 (Small Outline Integrated Circuit) package per JEDEC MS-012, with 1.27 mm pitch and standard gull-wing leads. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SO8 pin 1 indexing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM805TSA and MAX691ACPE+, STM795TM6F uniquely integrates E/ECON logic and Vccsw for robust, timing-precise LPSRAM enable control - making it irreplaceable in applications requiring coordinated reset and memory access gating during power transitions.

Availability

STM795TM6F is available at Aetrix Electronics and suitable for industrial PLC memory backup, medical device data retention, smart meter firmware preservation, and automotive telematics event logging requiring stable component supply across extended product lifecycles.

Supply support for STM795TM6F 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 microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM690–STM806 series was developed specifically to provide integrated microprocessor supervision with non-volatile memory support - targeting embedded systems where reliable power monitoring and SRAM backup coordination are mission-critical.

FAQ

Is STM795TM6F pin-compatible with other STM690-series supervisors?

No. STM795TM6F uses a unique pinout: E (pin 6), ECON (pin 8), and Vccsw (pin 4) replace PFI (pin 5), PFO (pin 1), and MR (pin 6) found on STM690/802/804/805. Its SO8 footprint is identical, but signal mapping differs - direct replacement requires PCB redesign and firmware logic updates for E/ECON handshaking.

Does STM795TM6F support watchdog functionality?

No. The STM795 explicitly omits the watchdog timer - confirmed in Section 2.3 of the datasheet ("NOT available on STM704/795/806"). Unlike STM690/802/804/805, it provides no WDI pin or internal watchdog circuitry. Systems requiring watchdog supervision must add external circuitry or select another member of the family.

What is the maximum load current supported on VOUT and how is higher current achieved?

VOUT supports up to 75 mA continuously. For higher current, the Vccsw output (pin 4) is used to drive the gate of an external PMOS transistor (e.g., DMP2035U), which switches battery power to the LPSRAM. This architecture decouples current handling from the IC's internal switch, enabling scalable backup power delivery beyond the 75 mA limit.

Can ECON be used directly to drive LPSRAM CE# without additional buffering?

Yes. ECON is an open-drain output rated for 3 mA sink current and 5.5 V max voltage, compatible with standard LPSRAM CE# inputs (e.g., Cypress CY14B101QN). Its 15 µs minimum hold time after reset release ensures setup time compliance, and its conditional logic (low only when E = low AND reset = high) eliminates need for external AND gates or timing delays.