DS17485-3 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated
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DS17485-3 Datasheet PDF : 38 Pages
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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
power-on from date/time alarm or key
closure
§ 32kHz output on power-up
§ Crystal select bit allows RTC to operate with
6pF or 12.5pF crystal
§ 114 bytes user NV RAM
§ Auxiliary battery input
§ 4kB additional NV RAM
§ RAM clear input
§ Century register
§ Date alarm register
§ Compatible with existing BIOS for original
DS1287 functions
§ Available as chip (DS17485) or standalone
module with embedded battery and crystal
(DS17487)
§ Timekeeping algorithm includes leap-year
compensation valid up to 2100
§ Underwriters Laboratory (UL) recognized
TYPICAL OPERATING CIRCUIT
DS17485/DS17487
3V/5V Real-Time Clock
PIN ASSIGNMENT
PWR 1
X1 2
X2 3
AD0 4
AD1 5
AD2 6
AD3 7
AD4 8
AD5 9
AD6 10
AD7 11
GND 12
24
VCC
23 SQW
22
VBAUX
21 RCLR
20
VBAT
19 IRQ
18 KS
17 RD
16 GND
15 WR
14
ALE
13 CS
DS17485 24-Pin DIP
DS17485S 24-Pin SO
PWR 1
NC 2
NC 3
AD0 4
AD1 5
AD2 6
AD3 7
AD4 8
AD5 9
AD6 10
AD7 11
GND 12
24
VCC
23 SQW
22
VBAUX
21 RCLR
20 NC
19 IRQ
18 KS
17 RD
16 NC
15 WR
14
ALE
13 CS
DS17487 24-Pin
Encapsulated Package
IRQ
VBAT
RCLR
VBAUX
SQW
VCC
VCC
PWR
X1
X2
NC
ADO
AD1
AD2
1
28
KS
2
27
RD
3
26
GND
4
25
WR
5
24
ALE
6
23
CS
7
22
GND
8
21
GND
9
20
AD7
10
19
AD6
11
18
NC
12
17
AD5
13
16
AD4
14
15
AD3
DS17485E 28-Pin TSOP
1 of 38
050802
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