DS1689/DS1693
3V/5V Serialized Real-Time Clocks
with NV RAM Control
www.maxim-ic.com
FEATURES
Incorporates Industry Standard DS1287 PC
Clock Plus Enhanced Features:
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RAM Clear Input
Century Register
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+3V or +5V Operation
32kHz Output for Power Management
32-Bit VCC Powered Elapsed Time Counter
32-Bit VBAT Powered Elapsed Time Counter
16-Bit Power Cycle Counter
64-Bit Silicon Serial Number
64-Bit Customer Specific ROM or
Additional Serial Number Available
Power Control Circuitry Supports System
Power-On from Date/Time Alarm or Key
Closure
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Compatible with Existing BIOS for Original
DS1287 Functions
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Available as IC (DS1689) or Stand-Alone
Module with Embedded Battery and Crystal
(DS1693)
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Automatic Battery Backup and Write
Protection to External SRAM
Crystal Select Bit Allows RTC to Operate
with 6pF or 12.5pF Crystal
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Available in Industrial Temperature
Version
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114 Bytes User NV RAM
Timekeeping Algorithm Includes Leap Year
Compensation Valid Up to 2100
Auxiliary Battery Input
PIN CONFIGURATIONS
VBAUX
N.C.
N.C.
RCLR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
PWR
1
28
27
CEI
VBAUX
1
28
27
CEI
2
3
4
CEO
X1
2
3
CEO
VCCI
26
25
26
25
X2
VCCI
VCCO
VCCO
RCLR
5
6
24
23
SQW
5
6
24
23
AD0
SQW
N.C.
VBAT
AD1
7
8
22
21
IRQ
7
8
22
21
AD2
AD3
IRQ
PSEL
PSEL
9
20
19
RD
9
20
19
AD4
AD5
AD6
RD
10
N.C.
10
GND
11
18
WR
11
18
WR
12
17
ALE
12
17
ALE
CS
AD7
PWR
GND
13
14
16
15
CS
KS
13
14
16
15
GND
KS
Encapsulated DIP
SO
ORDERING INFORMATION
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
VOLTAGE (V) PIN-PACKAGE
TOP MARK*
DS1689S
DS1689S
DS1689S
DS1689S
DS1689S
DS1689S
DS1689S
DS1689S
DS1693
DS1689S
3 to 5
3 to 5
3 to 5
3 to 5
3 to 5
3 to 5
3 to 5
3 to 5
3 to 5
28 SO (0.330″)
28 SO (0.330″)
28 SO (0.330″)
28 SO (0.330″)
28 SO (0.330″)/Tape & Reel
28 SO (0.330″)/Tape & Reel
28 SO (0.330″)/Tape & Reel
28 SO (0.330″)/Tape & Reel
28 EDIP (0.740″)
DS1689S+
DS1689SN
DS1689SN+
DS1689S/T&R
DS1689S+T&R
DS1689SN/T&R
DS1689SN+T&R
DS1693
+ 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 device.
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