DS1384 Datasheet, PDF (1/17 Pages) Dallas Semiconductor – Watchdog Timekeeping Controller

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DS1384
Watchdog Timekeeping Controller
FEATURES
PIN ASSIGNMENT
Keeps track of hundredths of seconds,
seconds, minutes, hours, days, date of the
month, months, and years with leap year
compensation valid up to 2100
44
Watchdog timer restarts an out-of-control
processor
1
Alarm function schedules real-time related ^INTB/(INTB)
activities
NC
A14
Programmable interrupts and square wave
A12
outputs
A7
Bytewide RAM-like access
A6
A5
50 bytes of on board user RAM
A4
Greater than 10 years timekeeping and data
A3
retention in the absence of power with small
A2
A1
lithium coin cells
Supports up to 128k x 8 of external static RAM
11
12
All timekeeping registers and on board RAM
are individually addressable via the address
and data bus
34
33
23
22
A15
VBAT1
WE
A13
A8
A9
A11
OE
A10
CE
OER
ORDERING INFORMATION
DS 1384FP-12
44-Pin FP
PIN DESCRIPTION
INTA
- Interrupt Output A (open drain)
INTB (INTB) - Interrupt Output B (open drain)
A0-A16
- Address Inputs
DQ0-DQ7 - Data Input/Output
CE
- Chip Enable
OE
- Output Enable
WE
V_CC
GND
NC
SQW
X1, X2
- Write Enable
- +5V Input
- Ground
- No Connection
- Square Wave Output
- 32.768 kHz Crystal Connections
PFO
- Power Fail Output
CEO
- Chip Enable RAM
OER
V_CCO
V_BAT1
V_BAT2
- Output Enable RAM
- Voltage Out
- +3V Battery Input
- +3V Battery Input
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