STK16C68 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 8K x 8 AutoStorePlus™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM

STK16C68
8K x 8 AutoStorePlus™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
Obsolete - Not Recommend for new Designs
FEATURES
• Internal Capacitor Guarantees AutoStore™
Regardless of Power-Down Slew Rate
• Nonvolatile Storage without Battery Problems
• Directly Replaces 8K x 8 Static RAM, Battery-
Backed RAM or EEPROM
• 25ns, 35ns and 45ns Access Times
• STORE to Nonvolatile Elements Initiated by
Software or AutoStorePlus™ on Power Down
• 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
• 100-Year Data Retention over Full Industrial
Temperature Range
• No Data Loss from Undershoot
• Commercial and Industrial Temperatures
• 28-Pin 600 mil PDIP Package
DESCRIPTION
The STK16C68 is a fast SRAM with a nonvolatile ele-
ment 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 Nonvola-
tile Elements to the SRAM (the RECALL operation) take
place automatically on restoration of power. Initiation
of STORE and RECALL cycles can also be controlled by
entering control sequences on the SRAM inputs. The
STK16C68 is pin-compatible with 8k x 8 SRAMs and
battery-backed SRAMs, allowing direct substitution
while enhancing performance. The STK12C68, which
uses an external capacitor, and the STK15C68, which
uses charge stored in system capacitance, are alter-
natives for systems needing AutoStore™ operation.
BLOCK DIAGRAM
A₅
A₆
A₇
A₈
A₉
A₁₁
A₁₂
DQ₀
DQ₁
DQ₂
DQ₃
DQ₄
DQ₅
DQ₆
DQ₇
QUANTUM TRAP
128 x 512
STATIC RAM
ARRAY
128 x 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
A₀ A₁ A₂ A₃ A₄ A₁₀
STORE/
RECALL
CONTROL
V_CC
POWER
CONTROL
INTERNAL
CAPACITOR
PIN CONFIGURATIONS
NC 1
A₁₂ 2
A₇ 3
A₆ 4
A₅ 5
A₄ 6
A₃ 7
A₂ 8
A₁ 9
A₀ 10
DQ₀ 11
DQ₁ 12
DQ₂ 13
V_SS 14
28 V_CC
27 W
26 NC
25 A₈
24 A₉
23 A₁₁
22 G
21 A₁₀
20 E
19 DQ₇
18 DQ₆
17
16
DQ₅
DQ₄
28 - 600 PDIP
15 DQ₃
SOFTWARE
DETECT
G
E
W
A₀ - A₁₂
PIN NAMES
A₀ - A₁₂
W
DQ₀ - DQ₇
E
G
V_CC
V_SS
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 5V)
Ground
March 2006
1 Document Control # ML0010 rev 0.2