1216C.PDF

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DS1216C
SmartWatch/RAM 64K/256K
www.dalsemi.com
FEATURES
§
Keeps track of hundredths of seconds,
seconds, minutes, hours, days, date of the
month, months, and years
§
Converts standard 8K x 8 and 32K x 8 CMOS
static RAMs into nonvolatile memory
§
Embedded lithium energy cell maintains
watch information and retains RAM data
§
Watch function is transparent to RAM
operation
§
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° to 70°
C
C
§
Accuracy is better than
±1
minute/month @
25°
C
PIN ASSIGNMENT
RST
1
2
3
4
5
6
7
8
9
10
DQ0
11
12
13
GND
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
CE
OE
V
CC
WE
28-Pin Intelligent Socket
PIN DESCRIPTION
Pin 1
Pin 11
Pin 14
Pin 20
Pin 22
Pin 27
Pin 28
RST
DQ0
GND
CE
OE
WE
V
CC
-
RESET
- Data Input/Output 0
- Ground
- Conditioned Chip Enable
- Output Enable
- Write Enable
- Switched V
CC
DESCRIPTION
The DS1216C SmartWatch/RAM is a 28–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 or a 32K 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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031899
DS1216C
DS1216C SMARTWATCH
28
15
1
A
14
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
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