DS1284QN Maxim Integrated Products, DS1284QN Datasheet - Page 4

• Manufacturer Part Number: DS1284QN
• Description: IC TIMEKEEPER WATCHDG IND 28PLCC
• Manufacturer: Maxim Integrated Products
• Type: Watchdog Timerr

Specifications of DS1284QN

• Memory Size: 50B
• Time Format: HH:MM:SS:hh (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-LCC, 28-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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