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DS1486 Datasheet

  • DS1486

  • RAMified Watchdog Timekeeper

  • Dallas   Dallas

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DS1486/DS1486P
RAMified Watchdog Timekeeper
www.maxim-ic.com
FEATURES
摟
摟
摟
摟
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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
PIN ASSIGNMENT
INTB (INTB)
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A15
INTA/SQW
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
ORDERING INFORMATION
DS1486
XXX
(32鈥損in DIP module)
鈥?50
150 ns access
鈥?20
120 ns access
34-pin PowerCap Module Board
鈥?50
150 ns access
鈥?20
120 ns access
DS1486 128k x 8
32-Pin Encapsulated Package
*DS1486P
XXX
*DS9034PCX
PowerCap Required
(must be ordered separately)
PIN DESCRIPTION
鈥?Interrupt Output A (open drain)
INTB
(INTB) 鈥?Interrupt Output B (open drain)
A0鈥揂16
鈥?Address Inputs
DQ0鈥揇Q7
鈥?Data Input/Output
CE
鈥?Chip Enable
OE
鈥?Output Enable
WE
鈥?Write Enable
V
CC
鈥?+5 Volts
GND
鈥?Ground
SQW
鈥?Square Wave Output
NC
鈥?No Connection
X1, X2
鈥?Crystal Connection
V
BAT
鈥?Battery Connection
INTB
INTB (INTB)
A15
A16
PFO
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
X1
GND V
BAT
X2
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
INTA
SQW
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
1 of 17
072401

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