Rainbow Electronics DS1646P - 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
DS1646 only (DIP Module)
−
Standard JEDEC bytewide 128k x 8 RAM
pinout
DS1646P 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
DS1646 32-pin DIP module
*DS1646P 34-pin PowerCap Module
Board
*DS9034PCX Power Cap
(Required; must be ordered
separately)
PIN ASSIGNMENT
DS1646/DS1646P
Nonvolatile Timekeeping RAM
www.dalsemi.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
NC
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 NC
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
NC
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
NC
DQ2
GND
15
16
18
17
DQ4
DQ3