Datenblatt-Suchmaschine für elektronische Bauteile |
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M40Z300WMQ6TR Datenblatt(PDF) 4 Page - STMicroelectronics |
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M40Z300WMQ6TR Datenblatt(HTML) 4 Page - STMicroelectronics |
4 / 21 page M40Z300, M40Z300W 4/21 DESCRIPTION The M40Z300/W NVRAM SUPERVISOR 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 outputs (E1CON to E4CON) are 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, 330mil 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.” 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-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 19). 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: For M40Z300W, B– must be connected to the negative bat- tery terminal only (not to Pin 8, VSS). AI02242 THS VCC M40Z300 M40Z300W BL VSS E VOUT B A E1CON E2CON E3CON E4CON RST B + (1) B – (1) THS Threshold Select Input E Chip Enable Input E1CON - E4CON Conditioned Chip Enable Output A, B Decoder Inputs RST Reset Output (Open Drain) BL Battery Low Output (Open Drain) VOUT Supply Voltage Output VCC Supply Voltage VSS Ground B + Positive Battery Pin B – Negative Battery Pin NC Not Connected Internally |
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