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BQ2204ASNTR Datasheet(PDF) 2 Page - Texas Instruments |
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BQ2204ASNTR Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 13 page  As the supply continues to fall past VPFD, an internal switching device forces VOUT to one of the two external backup energy sources. CECON1 through CECON4 are held high by the VOUT energy source. During power-up, VOUT is switched back to the 5V sup- ply as VCC rises above the backup cell input voltage sourcing VOUT. Outputs CECON1 through CECON4 are held inactive for time tCER (120ms maximum) after the power supply has reached VPFD, independent of the CE input, to allow for processor stabilization. During power-valid operation, the CE input is passed through to one of the four CECON outputs with a propa- gation delay of less than 10ns. The CE input is output on one of the four CECON output pins depending on the level of the decode inputs at A and B as shown in the Truth Table. The A and B inputs are usually tied to high-order ad- dress pins so that a large nonvolatile memory can be de- signed using lower-density memory devices. Nonvolatility and decoding are achieved by hardware hookup as shown in Figure 1. 2 bq2204A FG220401.eps CE BC2 THS VSS VOUT bq2204A VCC CE CMOS SRAM VCC 5V From Address Decoder CECON2 BC1 CECON1 VCC CE CMOS SRAM 3V Primary Cell 3V Primary Cell B A VCC CE CMOS SRAM VCC CE CMOS SRAM CECON3 CECON4 Figure 1. Hardware Hookup (5% Supply Operation) Dec. 1992 B |
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