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Dallas Semiconducotr - Nonvolatile Timekeeping RAM

Numéro de référence DS1647
Description Nonvolatile Timekeeping RAM
Fabricant Dallas Semiconducotr 
Logo Dallas Semiconducotr 





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DS1647 fiche technique
DS1647/DS1647P
Nonvolatile Timekeeping RAM
www.maxim-ic.com
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%
VCC 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
A18
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 VCC
31 A15
30 A17
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
32-Pin Encapsulated Package
NC
A15
A16
PFO
VCC
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
X1 GND VBAT
X2
17
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
A18
A17
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
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