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M40SZ100WMQ6 Folha de dados(PDF) 3 Page - STMicroelectronics |
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3 / 19 page 3/19 M40SZ100Y, M40SZ100W SUMMARY DESCRIPTION The M40SZ100Y/W NVRAM Controller is a self- contained device which converts a standard low- power SRAM into a non-volatile memory. A preci- sion voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition occurs, the condi- tioned chip enable output (ECON) is forced inactive to write protect the stored data in the SRAM. Dur- ing a power failure, the SRAM is switched from the VCC pin to the lithium cell within the SNAPHAT (or external battery for the 16-lead SOIC) to provide the energy required for data retention. On a sub- sequent power-up, the SRAM remains write pro- tected until a valid power condition returns. The 28-pin, 330 mil SOIC provides sockets with gold plated contacts for direct connection to a sep- arate 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 im- proper 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 sol- dered holder. Providing non-volatility becomes a “SNAP.” This feature is also available in the “top- less” 16-pin SOIC package (MQ). Insertion of the SNAPHAT housing after reflow prevents potential battery damage due to the high temperatures required for device surface-mount- ing. The SNAPHAT housing is also keyed to pre- vent 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 bat- tery/crystal package (e.g., SNAPHAT) part num- ber is “M4ZXX-BR00SH” (see Table 13, page 17). Caution: Do not place the SNAPHAT battery top in conductive foam, as this will drain the lithium button-cell battery. Figure 3. Logic Diagram Note: 1. For 16-pin SOIC package only. Table 1. Signal Names Note: 1. For SO16 only. AI03933 VCC M40SZ100Y M40SZ100W BL VSS E VOUT PFI ECON PFO RST RSTIN VBAT (1) E Chip Enable Input ECON Conditioned Chip Enable Output RST Reset Output (Open Drain) RSTIN Reset Input BL Battery Low Output (Open Drain) VOUT Supply Voltage Output VCC Supply Voltage VBAT (1) Back-up Supply Voltage PFI Power Fail Input PFO Power Fail Output VSS Ground NC Not Connected Internally |
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Descrição semelhante - M40SZ100WMQ6 |
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