ROM. DS1216 Datasheet


DS1216 Datasheet PDF


DS1216


SmartWatch RAM / SmartWatch ROM
19-6075; Rev 11/11

DS1216 SmartWatch RAM (DS1216B/C/D/H);
SmartWatch ROM (DS1216E/F)

GENERAL DESCRIPTION
The DS1216 SmartWatch RAM and SmartWatch ROM sockets are 600-mil-wide DIP sockets with a built-in CMOS watch function, an NV RAM controller circuit, and an embedded lithium energy source. The sockets provide an NV RAM solution for memory sized from 2K x 8 to 512K x 8 with package sizes from 26 pins to 32 pins. When a 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. The SmartWatch ROM sockets use the embedded lithium source to maintain the time and date only. A key feature of the SmartWatch is that the watch function remains transparent to the RAM. The SmartWatch monitors VCC for an out-of-tolerance condition. When such a condition occurs, an internal lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent loss of watch and RAM data.
TYPICAL OPERATING CIRCUIT

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
 Automatic Leap Y...



DS1216
19-6075; Rev 11/11
DS1216
SmartWatch RAM (DS1216B/C/D/H);
SmartWatch ROM (DS1216E/F)
GENERAL DESCRIPTION
The DS1216 SmartWatch RAM and SmartWatch
ROM sockets are 600-mil-wide DIP sockets with a
built-in CMOS watch function, an NV RAM
controller circuit, and an embedded lithium energy
source. The sockets provide an NV RAM solution
for memory sized from 2K x 8 to 512K x 8 with
package sizes from 26 pins to 32 pins. When a
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. The SmartWatch
ROM sockets use the embedded lithium source to
maintain the time and date only. A key feature of
the SmartWatch is that the watch function remains
transparent to the RAM. The SmartWatch monitors
VCC for an out-of-tolerance condition. When such a
condition occurs, an internal lithium energy source
is automatically switched on and write protection
is unconditionally enabled to prevent loss of watch
and RAM data.
TYPICAL OPERATING CIRCUIT
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
Automatic 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
Accuracy Better Than ±1 Minute/Month
at +25°C
ORDERING INFORMATION
PART
DS1216B
DS1216C
DS1216D
DS1216E
DS1216F
DS1216H
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SmartWatch Socket
28 SmartWatch Socket
32 SmartWatch Socket
28 SmartWatch Socket
32 SmartWatch Socket
32 SmartWatch Socket
(See Figure 2 for letter suffix marking identification.)
Selector Guide appears on page 2.
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DS1216
PIN DESCRIPTION
RST - Reset, Active Low
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, Active Low
DS1216 SmartWatch RAM/SmartWatch ROM
OE
WE
VCC
VCCB
VCCD
- Output Enable, Active Low
- Write Enable, Active Low
- Switched VCC for 28-/32-Pin RAM
- Switched VCC for 24-Pin RAM
- Switched VCC for 28-Pin RAM
PIN CONFIGURATIONS
TOP VIEW
RST 1
2
3
4
5
6
7
[A2] 8
9
[A0] 10
DQ0 11
12
13
GND 14
28 VCC
27 WE
26 VCCB
25
24
23
22 OE
21
20 CE
19
18
17
16
15
DS1216B/C/E
28-Pin Intelligent Socket
RST 1
2
3
4
5
6
7
8
9
[A2] 10
11
[A0] 12
DQ0
GND
13
14
15
16
32 VCC
31
30 VCCD
29 WE
28
27
26
25
24 OE
23
22 CE
21
20
19
18
17
DS1216D/F/H
32-Pin Intelligent Socket
SELECTOR GUIDE
PART
DS1216B
DS1216C
DS1216D
DS1216E
DS1216F
DS1216H
RAM/ROM
RAM
RAM
RAM
ROM
ROM
RAM
RAM DENSITY
16K/64K
64K/256K
256K/1M
64K/256K
64K/256K/1M
1M/4M
PC BOARD MODIFICATION
REQUIRED FOR DENSITY
UPGRADE?
No/Yes
No
No/Yes
No
No
No
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