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

M40Z111属于集成电路（IC） > 监控器。意法半导体（ST）集团制造生产的M40Z111监控器PMIC 监控器用于监视和/或控制电路中的电压轨，能够连接微控制器以维持一定的功率限值。监控器类型包括电池备用电路、监控器、多电压监控器、电源监控器、稳压器/监控器、复位计时器、定序器、简单复位/上电复位、智能开/关控制器、系统管理器、电压检测器和看门狗电路。