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Real-Time Clock

DS14287 Datasheet Preview

DS14287 Datasheet

(DS14285 / DS14287) Real-Time Clock

No Preview Available !

www.maxim-ic.com
FEATURES
Direct Replacement for IBM AT
Computer Clock/Calendar
Functionally Compatible with the
DS1285/DS1287
Available as Chip (DS14285, DS14285S, or
DS14285Q) or Stand-Alone Module with
Embedded Lithium Battery and Crystal
(DS14287)
Automatic Backup Supply and Write
www.DataShPereott4eUc.tcionmto Make External SRAM
Nonvolatile
Counts Seconds, Minutes, Hours, Days,
Day of the Week, Date, Month, and Year
with Leap Year Compensation Valid Up
to 2100
Binary or BCD Representation of Time,
Calendar, and Alarm
12- or 24-Hour Clock with AM and PM in
12-Hour Mode
Daylight Saving Time Option
Multiplex Bus for Pin Efficiency
Interfaced with Software as 128 RAM
Locations
14 Bytes of Clock and Control Registers
114 Bytes of General Purpose RAM
Programmable Square-Wave Output
Signal
Bus-Compatible Interrupt Signals (IRQ)
Three Interrupts are Separately Software-
Maskable and Testable
Time-of-Day Alarm Once/Second to
Once/Day
Periodic Rates from 122µs to 500ms
End of Clock Update Cycle
Optional Industrial Temperature Version
Available: DS14285 DIP, SO, and PLCC
DS14285/DS14287
Real-Time Clock with NV RAM
Control Control
PIN CONFIGURATIONS
TOP VIEW
VCCO
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
DIP/SO
VCC
SQW
CEO
CEI
VBAT
IRQ
RESET
DS
GND
R/W
AS
CS
AD0
AD1
AD2
AD3
AD4
AD5
N.C.
4 3 2 1 28 27 26
5 25
6 24
7 DS14285 23
8 22
9 21
10 20
11 19
12 13 14 15 16 17 18
CEI
VBAT
IRQ
RESET
DS
GND
R/W
PLCC
VCCO
N.C.
N.C.
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1 24
2
3
23
DS14287 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
VCC
SQW
CEO
CEI
N.C.
IRQ
RESET
DS
N.C.
R/W
AS
CS
Encapsulated Package
1 of 26
REV: 112105




Real-Time Clock

DS14287 Datasheet Preview

DS14287 Datasheet

(DS14285 / DS14287) Real-Time Clock

No Preview Available !

DS14285/DS14287
ORDERING INFORMATION
PART
TEMP RANGE
DS14285
0°C to +70°C
DS14285+
0°C to +70°C
DS14285N
-40°C to +85°C
DS14285N+
-40°C to +85°C
DS14285Q
0°C to +70°C
DS14285Q+
0°C to +70°C
DS14285QN
-40°C to +85°C
DS14285QN+
-40°C to +85°C
DS14285S
0°C to +70°C
DS14285S+
0°C to +70°C
DS14285SN
-40°C to +85°C
DS14285SN+
-40°C to +85°C
DS14285SN/T&R
www.DataDSSh1e4e2t845US.Nco+mT&R
-40°C to +85°C
-40°C to +85°C
DS14285S/T&R
0°C to +70°C
DS14285S+T&R
0°C to +70°C
DS14287
0°C to +70°C
DS14287+
0°C to +70°C
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
5.0
5.0
5.0
5.0
5.0
PIN-PACKAGE
24 DIP (0.600)
24 DIP (0.600)
24 DIP (0.600)
24 DIP (0.600)
28 PLCC
28 PLCC
28 PLCC
28 PLCC
24 SO (0.300)
24 SO (0.300)
24 SO (0.300)
24 SO (0.300)
24 SO (0.300)/Tape & Reel
24 SO (0.300)/Tape & Reel
24 SO (0.300)/Tape & Reel
24 SO (0.300)/Tape & Reel
24 EDIP (0.740)
24 EDIP (0.740)
TOP MARK*
DS14285
DS14285
DS14285N
DS14285N
DS14285Q
DS14285Q
DS14285QN
DS14285QN
DS14285S
DS14285S
DS14285SN
DS14285SN
DS14285SN
DS14285SN
DS14285S
DS14285S
DS14287
DS14287
+ Denotes a lead-free/RoHS-compliant device.
* A “+” anywhere on the top mark denotes a lead-free/RoHS-compliant device. An “N” denotes an industrial temperature grade device.
PIN DESCRIPTION
AD0-AD7
NC
MOT
- Multiplexed Address/Data Bus
- No Connection
- Bus Type Select (DS14285Q only)
CS - Chip Select
AS - Address Strobe
R/ W - Read/Write Input
DS - Data Strobe
RESET
- Reset Input
IRQ - Interrupt Request Output
SQW
VCC
GND
VCCO
- Square Wave Output
- +5V Supply
- Ground
- RAM Power Supply Output
CEI - RAM Chip Enable In
CEO
X1, X2
VBAT
- RAM Chip Enable Out
- 32.768 kHz Crystal Connections
- +3V Battery Input
2 of 26


Part Number DS14287
Description (DS14285 / DS14287) Real-Time Clock
Maker Real-Time Clock
Total Page 26 Pages
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