DS1284QN Maxim Integrated Products, DS1284QN Datasheet

IC TIMEKEEPER WATCHDG IND 28PLCC

DS1284QN

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

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

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www.maxim-ic.com
GENERAL DESCRIPTION
The DS1284/DS1286 watchdog timekeepers are
self-contained real-time clocks, alarms, watchdog
timers, and interval timers in a 28-pin JEDEC DIP
and encapsulated DIP package. The DS1286
contains an embedded lithium energy source and a
quartz crystal, which eliminates the need for any
external circuitry. The DS1284 requires an external
quartz crystal and a V
lithium battery. Data contained within 64 8-bit
registers can be read or written in the same manner
as byte-wide static RAM. Data is maintained in the
watchdog timekeeper by intelligent control circuitry
that detects the status of V
memory when V
energy source can maintain data and real time for
over 10 years in the absence of V
timekeeper information includes hundredths of
seconds, seconds, minutes, hours, day, date, month,
and year. The date at the end of the month is
automatically adjusted for months with fewer than
31 days, including correction for leap year. The
DS1284/DS1286 operate in either 24-hour or 12-
hour format with an AM/PM indicator. The devices
provide alarm windows and interval timing between
0.01 seconds and 99.99 seconds. The real-time
alarm provides for preset times of up to one week.
ORDERING INFORMATION
+
* A “+” anywhere on the top mark indicates a lead-free package.
DS1284
DS1284N
DS1284Q
DS1284Q+
DS1284Q/T&R
DS1284Q+T&R
DS1284QN
DS1284QN+
DS1284QN/T&R
DS1284QN+T&R
DS1286
DS1286I
DS1286I+
Denotes a lead(Pb)-free/RoHS-compliant package.
PART
CC
is out of tolerance. The lithium
BAT
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
source, which could be a
CC
and write protects
CC
. Watchdog
VOLTAGE (V)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
1 of 18
FEATURES
Pin Configurations appear at end of data sheet.
Keeps Track of Hundredths of Seconds,
Seconds, Minutes, Hours, Days, Date of the
Month, Months, and Years; Valid Leap Year
Compensation Up to 2100
Watchdog Timer Restarts an Out-of-Control
Processor
Alarm Function Schedules Real-Time-Related
Activities
Embedded Lithium Energy Cell Maintains
Time, Watchdog, User RAM, and Alarm
Information
Programmable Interrupts and Square-Wave
Outputs Maintain JEDEC Footprint
All Registers are Individually Addressable via
the Address and Data Bus
Accuracy is Better than ±1 Minute/Month at
+25°C (EDIP)
Greater than 10 Years of Timekeeping in the
Absence of V
50 Bytes of User NV RAM
Underwriters Laboratory (UL) Recognized
-40°C to +85°C Industrial Temperature Range
Option
PIN-PACKAGE
28 DIP (600 mils)
28 DIP (600 mils)
28 PLCC
28 PLCC
28 PLCC/Tape and Reel
28 PLCC/Tape and Reel
28 PLCC
28 PLCC
28 PLCC/Tape and Reel
28 PLCC/Tape and Reel
28 EDIP (720 mils)
28 EDIP (720 mils)
28 EDIP (720 mils)
Watchdog Timekeepers
CC
DS1284/DS1286
TOP MARK*
DS1284
DS1284 N
DS1284Q
DS1284Q
DS1284Q
DS1284Q
DS1284QN
DS1284QN
DS1284QN
DS1284QN
DS1286
DS1286 IND
DS1286 IND
REV: 032406

Related parts for DS1284QN

DS1284QN Summary of contents

Page 1

... PLCC/Tape and Reel 5.0 28 PLCC/Tape and Reel 5.0 28 EDIP (720 mils) 5.0 28 EDIP (720 mils) 5.0 28 EDIP (720 mils DS1284/DS1286 Watchdog Timekeepers CC TOP MARK* DS1284 DS1284 N DS1284Q DS1284Q DS1284Q DS1284Q DS1284QN DS1284QN DS1284QN DS1284QN DS1286 DS1286 IND DS1286 IND REV: 032406 ...

Page 2

OPERATION—READ REGISTERS The DS1284/DS1286 execute a read cycle whenever WE (write enable) is inactive (high) and CE (chip enable) and OE (output enable) are active (low). The unique address specified by the six address inputs (A0–A5) defines which of the ...

Page 3

PIN DESCRIPTION PIN DIP EDIP PLCC — 21, 24 5–10 5–10 5–10 11, 12, 11, 12, 11, 12, 13, 15, 13, 15, 13, 15, 16–19 16–19 16–19 ...

Page 4

PIN DIP EDIP PLCC Figure 1. Block Diagram X1  8 Oscillator X2 DS1286 only Internal Registers External Registers, clock, calendar, time of day alarm Command Register A0-A5 CE User RAM 50 Bytes OE WE NAME Primary ...

Page 5

HUNDREDTHS-OF-SECONDS GENERATOR The hundredths-of-seconds generator circuit shown in the Block Diagram (Figure state machine that divides the incoming frequency (4096Hz for 24 cycles and 40 for 1 cycle. This produces a 100Hz output that is ...

Page 6

TIME-OF-DAY REGISTERS Registers and A contain time-of-day data in BCD. Ten bits within these eight registers are not used and always read 0 regardless of how they are written. Bits 6 and 7 ...

Page 7

WATCHDOG ALARM REGISTERS Registers C and D contain the time for the watchdog alarm. The two registers contain a time count from to 99.99 seconds in BCD. The value written into the watchdog alarm registers can be written or read ...

Page 8

Bit 1: Watchdog Alarm Flag (WAF). When this bit is set internally to logic 1, a watchdog alarm has ...

Page 9

ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………..-0.3V to +7.0V Operating Temperature Range Commercial………………………………………………………………………………..0C to +70C Industrial………………………………………………………………………………...-40°C to +85°C Storage Temperature Range………………………………………………………………...-40°C to +85°C Soldering Temperature………………..……………...See IPC/JEDEC J-STD-020 Specification (Note 13) Stresses beyond those listed as “Absolute ...

Page 10

CAPACITANCE (T = +25°C) A PARAMETER Input Capacitance Output Capacitance Input/Output Capacitance AC ELECTRICAL CHARACTERISTICS (V = 4.5V to 5.5V -40C to +85C or 0°C to +70°C PARAMETER Read Cycle Time Address Access Time CE Access ...

Page 11

READ CYCLE (NOTE 1) WRITE CYCLE 1 (NOTES DS1284/DS1286 ...

Page 12

WRITE CYCLE 2 (NOTES 2, 8) TIMING DIAGRAM: INTERRUPT OUTPUTS PULSE MODE (NOTES 11, 12 DS1284/DS1286 ...

Page 13

POWER-UP/POWER-DOWN CONDITION PARAMETER before Power-Down IH V Slew from 4. ( Slew from 0V to 4.5V ( after Power-Up IH POWER-DOWN/POWER-UP CONDITION (T = +25°C) ...

Page 14

NOTES high for a read cycle specified as the logical AND of CE and WE low to the earlier ...

Page 15

PIN CONFIGURATIONS TOP VIEW INTA DS1284 3 N. DQ0 11 12 DQ1 13 DQ2 14 GND DIP (600 mils) INTA ...

Page 16

PACKAGE INFORMATION PKG 28-PIN PLCC DIM MIN A IN. 0.300 BSC MM 7.62 B IN. 0.442 MM 17.68 D IN. 0.480 MM 12.2 D2 IN. 0.390 MM 9.91 E IN. 0.090 MM 2.29 E2 IN. 0.390 MM 9.91 F IN. ...

Page 17

PACKAGE INFORMATION (continued) PKG 28-PIN DIP DIM MIN A IN. 1.445 MM B IN. 0.530 MM C IN. 0.140 MM D IN. 0.600 MM E IN. 0.015 MM F IN. 0.120 MM G IN. 0.090 MM H IN. 0.625 MM ...

Page 18

... Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product. No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. PKG DIM A IN ...

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