DS17885S5 Dallas Semiconductor, DS17885S5 Datasheet
![no-image](/images/manufacturer_photos/0/1/182/dallas_semiconductor_sml.jpg)
DS17885S5
Manufacturer Part Number
DS17885S5
Description
SOP24
Manufacturer
Dallas Semiconductor
Datasheet
1.DS17885S5.pdf
(38 pages)
Specifications of DS17885S5
Date_code
04+
www.maxim-ic.com
FEATURES
Incorporates industry standard DS1287 PC clock
plus enhanced features:
§ Y2K compliant
§ +3V or +5V operation
§ SMI recovery stack
§ 64-bit silicon serial number
§ Power-control circuitry supports system
§ 32kHz output on power-up
§ Crystal select bit allows RTC to operate with
§ 114 bytes user NV RAM
§ Auxiliary battery input
§ 8kB additional NV RAM
§ RAM clear input
§ Century register
§ Date alarm register
§ Compatible with existing BIOS for original
§ Available as chip (DS17885) or standalone
§ Timekeeping algorithm includes leap-year
§ Underwriters Laboratory (UL) recognized
TYPICAL OPERATING CIRCUIT
power-on from date/time alarm or key
closure
6pF or 12.5pF crystal
DS1287 functions
module with embedded battery and crystal
(DS17887)
compensation valid up to 2100
1 of 38
PIN ASSIGNMENT
VBAUX
VBAT
RCLR
SQW
PWR
ADO
VCC
VCC
AD1
AD2
IRQ
NC
X1
X2
3V/5V Real-Time Clock
GND
PWR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
X1
X2
GND
PWR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
10
11
12
13
14
NC
NC
1
2
3
4
5
6
7
8
9
Encapsulated Package
DS17885E 28-Pin TSOP
DS17885S 24-Pin SO
DS17885 24-Pin DIP
DS17887 24-Pin
DS17885/DS17887
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
24
23
22
21
20
19
18
17
16
15
14
13
VCC
SQW
VBAUX
RCLR
VBAT
IRQ
KS
RD
GND
WR
ALE
CS
VCC
SQW
VBAUX
RCLR
NC
IRQ
KS
RD
NC
WR
ALE
CS
28
27
26
25
24
23
22
21
20
19
18
17
16
15
KS
RD
GND
WR
ALE
CS
GND
GND
AD7
AD6
NC
AD5
AD4
AD3
050802