Rainbow Electronics DS1216 User Manual
Ds1216, Features, Ordering information
1 of 13
111901
FEATURES
§ 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
§ 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
ORDERING INFORMATION
DS1216B, DS1216C, DS1216D, DS1216E,
DS1216F, DS1216H
(See Figure 2 for letter suffix
marking identification.)
PIN DESCRIPTION
RST
-
RESET
DQ0
- Data Input/Output 0 [RAM]
A2
- Address Bit 2 (Read/Write [ROM])
A0
- Address Bit 0 (Data Input [ROM])
GND
- Ground
CE
- Conditioned Chip Enable
OE
- Output Enable
WE
- Write Enable
Vcc
- Switched V
CC
for 28-/32-Pin RAM
V
CC
B - Switched V
CC
for 24-Pin RAM
V
CC
D - Switched V
CC
for 28-Ppin RAM
PART
RAM/ROM
RAM DENSITY
PCB MODIFICATION REQUIRED
FOR DENSITY UPGRADE?
DS1216B
RAM
16k/64k
No/Yes
DS1216C
RAM
64k/256k
No
DS1216D
RAM
256k/1M
No/Yes
DS1216E
ROM
64k/256k
No
DS1216F
ROM
64k/256k/1M
No
DS1216H
RAM
1M/4M
No
DS1216
SmartWatch RAM DS1216B/C/D/H
SmartWatch ROM DS1216E/F
www.maxim-ic.com
DS1216B/C/D/E
28-Pin Intelligent Socket
2
27
WE
3
26
V
CC
B
4
25
5
24
[A2] 8
21
6
23
9
20
CE
7
22
OE
[A0] 10
19
DQ0 11
18
12
17
13
16
GND 14
15
RST 1
28
V
CC