STK20C04 Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – CMOS nvSRAM High Performance 512 x 8 Nonvolatile Static RAM

STK20C04
512 x 8 nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
Obsolete - Not Recommend for new Designs
FEATURES
• 25ns, 35ns and 45ns Access Times
• STORE to Nonvolatile Elements Initiated by
Hardware
• RECALL to SRAM Initiated by Hardware or
Power Restore
• Automatic STORE Timing
• 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
• Commercial and Industrial Temperatures
DESCRIPTION
The Simtek STK20C04 is a fast static RAM with a non-
volatile 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 may easily be
transferred from the SRAM to the Nonvolatile Elements
(the STORE operation), or from the Nonvolatile Ele-
ments to the SRAM (the RECALL operation), using the
NE pin. Transfers from the Nonvolatile Elements to the
SRAM (the RECALL operation) also take place auto-
matically on restoration of power. The STK20C04
combines the high performance and ease of use of a
fast SRAM with nonvolatile data integrity.
The STK20C04 features industry-standard pinout for
nonvolatile RAMs in a 28-pin 600 mil plastic DIP.
BLOCK DIAGRAM
Quantum Trap
16 x 256
STORE
A₅
A₆
A₇
STATIC RAM
ARRAY
16 x 256
RECALL
A₈
DQ₀
DQ₁
DQ₂
DQ₃
DQ₄
DQ₅
DQ₆
DQ₇
COLUMN I/O
COLUMN DEC
A₀ A₁ A₂ A₃ A₄
PIN CONFIGURATIONS
NE 1
NC 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 NC
23 NC
22 G
21 NC
20 E
19 DQ₇
18 DQ₆
17 DQ₅
16 DQ₄
15 DQ₃
28 - 600 PDIP
STORE/
RECALL
CONTROL
G
NE
E
W
PIN NAMES
A₀ - A₈
W
DQ₀ - DQ₇
E
G
NE
V_CC
V_SS
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Nonvolatile Enable
Power (+ 5V)
Ground
March 2006
1 Document Control # ML0001 rev 0.2