DS1216
SmartWatch RAM DS1216B/C/D/H
SmartWatch ROM DS1216E/F
www.maxim-ic.com
FEATURES
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Keeps track of hundredths of seconds,
seconds, minutes, hours, days, date of the
month, months, and years
Converts standard 2k x 8 up to 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 RAM
operation
Month and year determine the number of days
in each month; leap-year compensation valid
up to 2100
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Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
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Proven gas-tight socket contacts
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Full
±10%
operating range
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Operating temperature range: 0°C to +70°C
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Accuracy is better than
±1
minute/month @
+25°C
ORDERING INFORMATION
DS1216B, DS1216C, DS1216D, DS1216E,
DS1216F, DS1216H
(See Figure 2 for letter suffix
marking identification.)
RST 1
2
3
4
5
6
7
[A2] 8
9
[A0] 10
DQ0 11
12
13
GND 14
28
V
CC
27 WE
26 V
CC
B
25
24
23
22
21
20
19
18
17
16
15
CE
OE
PIN DESCRIPTION
RST
DQ0
A2
A0
GND
CE
OE
WE
Vcc
V
CC
B
V
CC
D
-
RESET
- Data Input/Output 0 [RAM]
- Address Bit 2 (Read/Write [ROM])
- Address Bit 0 (Data Input [ROM])
- Ground
- Conditioned Chip Enable
- Output Enable
- Write Enable
- Switched V
CC
for 28-/32-Pin RAM
- Switched V
CC
for 24-Pin RAM
- Switched V
CC
for 28-Ppin RAM
RAM/ROM
RAM
RAM
RAM
ROM
ROM
RAM
RAM DENSITY
16k/64k
64k/256k
256k/1M
64k/256k
64k/256k/1M
1M/4M
1 of 13
DS1216B/C/D/E
28-Pin Intelligent Socket
PART
DS1216B
DS1216C
DS1216D
DS1216E
DS1216F
DS1216H
PCB MODIFICATION REQUIRED
FOR DENSITY UPGRADE?
No/Yes
No
No/Yes
No
No
No
111901
DALLAS [ DALLAS SEMICONDUCTOR ]
