Rainbow Electronics DS1747P User Manual
Features, Pin assignment
1 of 18
072401
FEATURES
§ Integrated NV SRAM, real-time clock,
crystal, power-fail control circuit and lithium
energy source
§ Clock registers are accessed identical to the
static RAM. These registers are resident in the
eight top RAM locations.
§ Century byte register (Y2K compliant)
§ Totally nonvolatile with over 10 years of
operation in the absence of power
§ BCD coded century, year, month, date, day,
hours, minutes, and seconds with automatic
leap year compensation valid up to the year
2100
§ Battery voltage level indicator flag
§ Power-fail write protection allows for ±10%
V
CC
power supply tolerance
§ Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
§ DIP Module only
-
Standard JEDEC bytewide 512k x 8 static
RAM pinout
§ PowerCap
Ò
Module Board only
-
Surface mountable package for direct
connection to PowerCap containing
battery and crystal
-
Replaceable battery (PowerCap)
-
Power-On Reset Output
-
Pin for pin compatible with other densities
of DS174XP Timekeeping RAM
PIN ASSIGNMENT
DS1747/DS1747P
Y2KC Nonvolatile Timekeeping RAM
www.maxim-ic.com
1
NC
2
3
A15
A16
RST
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)
A18
13
1
2
3
4
5
6
7
8
9
10
11
12
14
31
512k X 8
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
DQ2
GND
15
16
18
17
DQ4
DQ3