Rainbow Electronics DS1647P - Manual

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FEATURES
§ Integrates NV SRAM, real-time clock,
crystal, power-fail control circuit and lithium
energy source
§ Clock registers are accessed identically to the
static RAM. These registers are resident in
the eight top RAM locations
§ Totally nonvolatile with over 10 years of
operation in the absence of power
§ BCD coded year, month, date, day, hours,
minutes, and seconds with leap year
compensation valid up to 2100
§ Power-fail write protection allows for ±10%
V
CC
power supply tolerance
§ DS1647 only (DIP Module)
- Standard JEDEC byte-wide 128k x 8
RAM pinout
§ DS1647P only (PowerCap ® Module Board)
- Surface mountable package for direct
connection to PowerCap containing
battery and crystal
- Replaceable battery (PowerCap)
- Power-fail output
-
Pin-for-pin compatible with other
densities of DS164XP Timekeeping
RAM
ORDERING INFORMATION
DS1647 32-pin DIP module
*DS1647P 34-pin PowerCap Module
Board
*DS9034PCX PowerCap (Required; must
be ordered separately)
PIN ASSIGNMENT
DS1647/DS1647P
Nonvolatile Timekeeping RAM
www.maxim-ic.com
1 NC
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
A17
A14
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
34 A18
X1 GND V
BAT
X2
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
13
1
2
3
4
5
6
7
8
9
10
11
12
14
31
32-Pin Encapsulated Package
A14
A7
A5
A4
A3
A2
A1
A0
DQ1
DQ0
V
CC
A15
A17
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ5
DQ6
32
30
29
28
27
26
25
24
23
22
21
19
20
A16
A12
A6
A18
DQ2
GND
15
16 18
17 DQ4
DQ3