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DS1284Q/T Datasheet(PDF) 4 Page - Dallas Semiconductor

Part # DS1284Q/T
Description  Watchdog Timekeepers
PDF  18 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1284Q/T Datasheet(HTML) 4 Page - Dallas Semiconductor

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DS1284/DS1286
4 of 18
PIN
DIP
EDIP
PLCC
NAME
FUNCTION
28
28
28
VCC
Primary Power-Supply Input. When voltage is applied within
normal limits, the device is fully accessible and data can be
written and read. When a backup supply is connected to the
device and VCC is below VTP, read and writes are inhibited.
However, the timekeeping function continues unaffected by the
lower input voltage.
Figure 1. Block Diagram
Internal Registers
Internal Counters
Internal Registers
Oscillator
÷ 8
÷ 40.96
÷ 40.96
PF delay
÷ 10
Update seconds through
years and check time of
day alarm
User RAM
50 Bytes
Command
Register
External Registers,
clock, calendar,
time of day alarm
Power
Switch
÷ 4
Swap
pins
External
Registers
Hundredths of
Seconds
External
Registers
Watchdog Alarm
Internal Counters
Data I/O Buffers
A0-A5
CE
OE
WE
V
CC
V
BAT
SQW
INTA
INTB/
(INTB)
1024Hz
TD INT
WD INT
DS1286
only
100Hz
100Hz
DS1286 only
GND
DQ0–DQ7
DS1284/DS1286
X1
X2
P
N
N
V
CC
IBH



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