Owner manual

1 of 17 072401
FEATURES
§ 128 kbytes of user NV RAM
§ Integrated NV SRAM, real-time clock,
crystal, power-fail control circuit and lithium
energy source
§ Totally nonvolatile with over 10 years of
operation in the absence of power
§ Watchdog timer restarts an out-of-control
processor
§ Alarm function schedules real-time related
activities such as system wakeup
§ Programmable interrupts and square wave
output
§ All registers are individually addressable via
the address and data bus
§ Interrupt signals active in power-down mode
ORDERING INFORMATION
DS1486 XXX (32–pin DIP module)
–150 150 ns access
–120 120 ns access
*DS1486P XXX 34-pin PowerCap Module Board
–150 150 ns access
–120 120 ns access
*DS9034PCX PowerCap Required
(must be ordered separately)
PIN DESCRIPTION
INTB – Interrupt Output A (open drain)
INTB (INTB) – Interrupt Output B (open drain)
A0–A16 – Address Inputs
DQ0–DQ7 – Data Input/Output
CE – Chip Enable
OE – Output Enable
WE – Write Enable
V
CC
– +5 Volts
GND – Ground
SQW – Square Wave Output
NC – No Connection
X1, X2 – Crystal Connection
V
BAT
– Battery Connection
PIN ASSIGNMENT
DS1486/DS1486P
RAMified Watchdog Timekeepe
r
www.maxim-ic.com
34
1
INTB
(
INTB
)
2
3
A15
A16
PFO
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
4
5
6
7
8
9
10
11
12
13
14
15
16
17
SQW
A
14
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A
13
A
12
A
11
A
10
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
INTA
X1
GND
V
BAT X2
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
INTB
(
INTB
)
13
1
2
3
4
5
6
7
8
9
10
11
12
14
31
DS1486 128k x 8
32-Pin Encapsulated Package
A14
A7
A5
A4
A3
A2
A1
A0
DQ1
DQ0
V
CC
A
15
INTA/SQW
WE
A
13
A
8
A
9
A
11
OE
A
10
CE
DQ7
DQ5
DQ6
32
30
29
28
27
26
25
24
23
22
21
19
20
A16
A12
A6
DQ2
GND
15
16
18
17
DQ4
DQ3