Description

The M40Z111/W NVRAM supervisor is a self-contained device which converts a standard low-power SRAM into a non-volatile memory.

A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition.

When an invalid VCC condition occurs, the conditioned chip enable (ECON) output is forced inactive to write-protect the stored data in the SRAM.

During a power failure, the SRAM is switched from the VCC pin to the lithium cell within the SNAPHAT? to provide the energy required for data retention. On a subsequent power-up, the SRAM remains write protected until a valid power condition returns.

The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery. The unique design allows the SNAPHAT battery package to be mounted on top of the SOIC package after the completion of the surface mount process.

Features

■ Convert low power SRAMs into NVRAMs

■ Precision power monitoring and power switching circuitry

■ Automatic write-protection when VCC is out-oftolerance

■ Choice of supply voltages and power-fail deselect voltages:

– M40Z111: VCC = 4.5 to 5.5 V

THS = VSS; 4.5 ≤ VPFD ≤ 4.75 V

THS = VOUT; 4.2 ≤ VPFD ≤ 4.5 V

– M40Z111W: VCC = 3.0 to 3.6 V

THS = VSS; 2.8 ≤ VPFD ≤ 3.0 V

VCC = 2.7 to 3.3 V

THS = VOUT; 2.5 ≤ VPFD ≤ 2.7 V

■ Less than 15 ns chip enable access

propagation delay (for 5.0 V device)

■ Packaging includes a 28-lead SOIC and

SNAPHAT? top (to be ordered separately)

■ SOIC package provides direct connection for a

SNAPHAT top which contains the battery

■ RoHS compliant

– Lead-free second level interconnect

M40Z111WMH6屬于集成電路（IC） > 監(jiān)控器。意法半導(dǎo)體（ST）集團(tuán)制造生產(chǎn)的M40Z111WMH6監(jiān)控器PMIC 監(jiān)控器用于監(jiān)視和/或控制電路中的電壓軌，能夠連接微控制器以維持一定的功率限值。監(jiān)控器類型包括電池備用電路、監(jiān)控器、多電壓監(jiān)控器、電源監(jiān)控器、穩(wěn)壓器/監(jiān)控器、復(fù)位計(jì)時(shí)器、定序器、簡單復(fù)位/上電復(fù)位、智能開/關(guān)控制器、系統(tǒng)管理器、電壓檢測器和看門狗電路。