March 2006
1
Document Control # ML0019 rev 0.2
STK16C88-3
32K x 8 AutoStorePlus™ nvSRAM
3.3V QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
• Transparent Data Save on Power Down
• Internal Capacitor Guarantees AutoStore™
Regardless of Power-Down Slew Rate
• Directly Replaces 32K x 8 Static RAM, Battery-
Backed RAM or EEPROM
• 35 Access Time
• STORE to Nonvolatile Elements Initiated by
Software or AutoStorePlus™
• RECALL to SRAM Initiated by Software or
Power Restore
• 10mA Typical I
CC at 200ns Cycle Time
• Unlimited READ, WRITE and RECALL Cycles
• 1,000,000 STORE Cycles to Nonvolatile Ele-
ments (Commercial/Industrial)
• 100-Year Data Retention in nonvolatile ele-
ments (Commercial/Industrial)
• Single 3.3V + 0.3V Operation
• Commercial and Industrial Temperatures
• 28-Pin PDIP Package
DESCRIPTION
The STK16C88-3 is a fast SRAM with a nonvolatile
element incorporated in each static memory cell.
The SRAM can be read and written an unlimited
number of times, while independent nonvolatile data
resides in Nonvolatile Elements. Data transfers from
the SRAM to the Nonvolatile Elements (the STORE
operation) can take place automatically on power
down. An internal capacitor guarantees the STORE
operation regardless of power-down slew rate.
Transfers from the Nonvolatile Elements to the
SRAM
(the RECALL operation) take place automati-
cally on restoration of power. Initiation of STORE and
RECALL
cycles can also be controlled by entering
control sequences on the SRAM inputs. The
STK16C88-3 is pin-compatible with 32k x 8 SRAMs
and battery-backed SRAMs, allowing direct substitu-
tion while providing superior performance. The
STK14C88-3, which uses an external capacitor, is
also available.
BLOCK DIAGRAM
QUANTUM TRAP
512 x 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
512 x 512
STORE/
RECALL
CONTROL
POWER
CONTROL
A6
A7
A11
A12
A13
A14
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
SOFTWARE
DETECT
VCC
A0 - A13
G
E
W
A9
A8
A10
A3
A2
A0 A1
A4
A5
INTERNAL
CAPACITOR
PIN CONFIGURATIONS
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
VCC
A13
A8
A9
A11
G
W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
28 - 600 PDIP
PIN NAMES
A0 - A14
Address Inputs
W
Write Enable
DQ0 - DQ7
Data In/Out
E
Chip Enable
G
Output Enable
VCC
Power (+ 3.3V)
VSS
Ground