产品概述
描述
The M40Z300/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 VCCinput for an out-of-tolerance condition.
When an invalid VCCcondition occurs, the conditioned chip enable outputs (E1CONto E4CON) are forced inactive to write-protect the stored data in the SRAM. During a power failure, the SRAM is switched from the VCCpin 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 for direct connection to a separate SNAPHAT housing containing the battery. The SNAPHAT housing has gold plated pins which mate with the sockets, ensuring reliable connection. The housing is keyed to prevent improper insertion. This unique design allows the SNAPHAT battery package to be mounted on top of the SOIC package after the completion of the surface mount process which greatly reduces the board manufacturing process complexity of either directly soldering or inserting a battery into a soldered holder. Providing non-volatility becomes a “SNAP.” The 16-pin SOIC provides battery pins for an external user-supplied battery.
Insertion of the SNAPHAT housing after reflow prevents potential battery damage due to the high temperatures required for device surface-mounting. The SNAPHAT housing is also keyed to prevent reverse insertion.
The 28-pin SOIC and battery packages are shipped separately in plastic anti-static tubes or in tape & reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part number is “M4ZXX-BR00SH”.
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所有功能
- Converts low power SRAM into NVRAMs
- Precision power monitoring and power switching circuitry
- Automatic WRITE-protection when VCCis out-of-tolerance
- Two-input decoder allows control for up to 8 SRAMs (with 2 devices active in parallel)
- Choice of supply voltages and power-fail deselect voltages:
- M40Z300: VCC= 4.5 V to 5.5 V THS = VSS: 4.5 V ≤ VPFD≤ 4.75 V THS = VOUT: 4.2 V ≤ VPFD≤ 4.5 V
- M40Z300W: VCC= 3.0 V to 3.6 V THS = VSS: 2.8 V ≤ VPFD≤ 3.0 V VCC= 2.7 V to 3.3 V THS = VOUT: 2.5 V ≤ VPFD≤ 2.7 V
- Reset output (RST) for power on reset
- Battery low pin (BL)
- Less than 12 ns chip enable access propagation delay (for 5.0 V device)
- Packaging includes a 28-lead SOIC and SNAPHAT®top (to be ordered separately), or A 16-lead SOIC
- SOIC package provides direct connection for a SNAPHAT top which contains the battery
- RoHS compliant
- Lead-free second level interconnect
EDA符号、封装和3D模型
意法半导体 - M40Z300W
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