DS1486 Datasheet, PDF (1/17 Pages) Dallas Semiconductor – RAMified Watchdog Timekeeper

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