Datenblatt-Suchmaschine für elektronische Bauteile |
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FM3808-70-T Datenblatt(PDF) 2 Page - Ramtron International Corporation |
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FM3808-70-T Datenblatt(HTML) 2 Page - Ramtron International Corporation |
2 / 27 page N O T R EC O M M EN D ED FO R N EW D ES IG N S La st Ti m e B uy : S ept . 200 6 N o Di re ct Re pl ac em en t Al te rn at e So lu tio n: FM 18 08 +F M 40 05 FM3808 Rev. 1.3 (EOL) Feb. 2006 Page 2 of 27 FRAM Array 32,752x8 Address Decoder/ Bus Interface 16 Clock/Calendar Registers Clock/Calendar Alarm Interrupt Control Logic System Supervisor Low VDD monitor/ Watchdog timer Data Address CE OE WE INT 32.768 kHz VDD VBAK Switched power Watchdog timebase X1 X2 Figure 1. Block Diagram Pin Description Pin Name I/O Pin Description A0-A14 Input Address: The 15 address inputs select one of 32,752 bytes in the FRAM array or one of 16 bytes in the clock/calendar. The address is latched on the falling edge of /CE. DQ(7:0) I/O Data: Bi-directional 8-bit data bus for accessing the FRAM array and clock. /CE Input Chip Enable: The active low /CE input selects the device. The falling edge of /CE internally latches the address. Address changes that occur after /CE has transitioned low are ignored until the next falling edge occurs. /OE Input Output Enable: The active low /OE input enables the data output buffers during read cycles. Deasserting /OE high causes the DQ pins to tri-state. /WE Input Write Enable: The active low /WE low enables data on the DQ pins to be written to the address location latched by the falling edge of /CE. X1, X2 Input Connect 32.768 kHz crystal. INT Output Interrupt output: This output can be programmed to respond to the clock/calendar alarm, the watchdog timer, and the power monitor. It is programmable to either active high (push/pull) or active low (open-drain). VBAK Supply Backup Supply Voltage: This supply is used to maintain power for the clock. It must remain above 2.5V to keep battery-backed functions active. VBAK is supplied by a battery. Current IBAK is drawn from VBAK when VDD is below the VBAK voltage. VDD Supply Supply Voltage: 5V VSS Supply Ground. |
Ähnliche Teilenummer - FM3808-70-T |
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Ähnliche Beschreibung - FM3808-70-T |
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