1216D.PDF

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DS1216D
SmartWatch/RAM 256K/1M
www.dalsemi.com
FEATURES
Converts standard 8K x 8, 32K x 8, and 512K
x 8 CMOS static RAMs into nonvolatile
memory
Embedded lithium energy cell maintains
watch information and retains RAM data
Watch function is transparent to memory
operation
Keeps track of hundredths of seconds,
seconds, minutes, hours, days, date of the
month, months, and years
Month and year determine the number of days
in each month; leap year compensation valid
up to 2100
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
Proven gas–tight socket contacts
Full
±10%
operating range
Operating temperature range 0°C to 70°C
Accuracy is better than
±1
minute/month @
25°C
PIN ASSIGNMENT
RST
1
2
3
4
5
6
7
8
9
10
11
12
DQ0
13
14
15
GND
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
CE
V
CC
WE
V
CC
OE
32-Pin Intelligent Socket
PIN DESCRIPTION
All pins pass through except 22, 30 and 32.
Pin 1
RST
- RESET
Pin 13 DQ0 - Data Input/Output 0
Pin 16 GND - Ground
Pin 22
Pin 24
Pin 29
Pin 30
Pin 32
CE
OE
WE
V
CC
V
CC
- Conditioned Chip Enable
- Output Enable
- Write Enable
- Switched VCC for 28-pin RAM
- Switched VCC for 32-pin RAM
DESCRIPTION
The DS1216D SmartWatch/RAM 256K/1M is a 32–pin, 600-mil wide DIP socket with a built–in CMOS
watch function, a nonvolatile RAM controller circuit, and an embedded lithium energy source. It accepts
either an 8K x 8, 32K x 8, 128K x 8, or 512K x 8 JEDEC bytewide CMOS static RAM. When the socket
is mated with a CMOS SRAM, it provides a complete solution to problems associated with memory
volatility and uses a common energy source to maintain time and date. A key feature of the SmartWatch
is that the watch function remains transparent to the RAM.
See the DS1216B SmartWatch/RAM 16/64K data sheet for technical details.
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DS1216D
DS1216D SMARTWATCH
PKG
DIM
A IN.
MM
B IN.
MM
C IN.
MM
D IN.
MM
E IN.
MM
F IN.
MM
G IN.
MM
H IN.
MM
J IN.
MM
K IN.
MM
L IN.
MM
28-PIN
32-PIN
MIN MAX MIN MAX
1.390 1.420 1.580 1.620
35.31 36.07 40.13 41.14
0.690 0.720 0.690 0.720
17.53 18.29 17.53 18.29
0.420 0.470 0.400 0.470
10.67 11.94 10.16 11.94
0.035 0.065 0.035 0.065
0.89 1.65 0.89 1.65
0.055 0.075 0.055 0.075
1.39 1.90 1.39 1.90
0.120 0.160 0.120 0.160
3.04 4.06 3.04 4.06
0.090 0.110 0.090 0.110
2.29 2.79 2.29 2.79
0.590 0.630 0.590 0.630
14.99 16.00 14.99 16.00
0.008 0.012 0.008 0.012
0.20 0.30 0.20 0.30
0.015 0.021 0.015 0.021
0.38 0.53 0.38 0.53
0.380 0.420 0.380 0.420
9.65 10.67 9.65 10.67
A
C
F
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