Rainbow Electronics DS1216 - Manual

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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