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FM3808 데이터시트(PDF) 2 Page - Ramtron International Corporation

부품명 FM3808
상세설명  256Kb Bytewide FRAM w/ Real-Time Clock
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제조업체  RAMTRON [Ramtron International Corporation]
홈페이지  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM3808 데이터시트(HTML) 2 Page - Ramtron International Corporation

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FM3808
Rev 1.1
May 2003
Page 2 of 28
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 between 2.5V and VDD-0.3V. VBAK is typically supplied by either a capacitor
or a battery. Current is drawn from VBAK when VDD is below the VBAK voltage.
VDD
Supply
Supply Voltage: 5V
VSS
Supply
Ground.


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