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M40Z300MH1TR Folha de dados(PDF) 2 Page - STMicroelectronics |
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M40Z300MH1TR Folha de dados(HTML) 2 Page - STMicroelectronics |
2 / 16 page M40Z300, M40Z300W 2/16 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, 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". The 16 pin SOIC provides battery pins for an ex- ternal user supplied battery. Figure 2A. SOIC28 Connections AI02243 8 2 3 4 5 6 7 9 10 11 12 13 14 22 21 20 19 18 17 16 15 28 27 26 25 24 23 1 NC NC BL NC A NC B RST NC NC NC E1CON NC E3CON E E2CON NC NC NC NC THS NC VSS E4CON NC NC VOUT VCC M40Z300 M40Z300W Table 1. Signal Names 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 Figure 2B. SOIC16 Connections AI03624 8 2 3 4 5 6 710 16 15 14 13 12 11 1 A RST B E1CON E E2CON B– (B+) VSS NC VOUT VCC M40Z300 M40Z300W BL THS E3CON E4CON 9 B+ (B–) ( ) = M40Z300W |
Nº de peça semelhante - M40Z300MH1TR |
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Descrição semelhante - M40Z300MH1TR |
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