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

STK20C04
STK20C04
CMOS nvSRAM
High Performance
512 x 8 Nonvolatile Static RAM
FEATURES
• 30, 35 and 45ns Access Times
• 15, 20 and 25ns Output Enable Access
• Unlimited Read and Write to SRAM
• Hardware STORE Initiation
• Automatic STORE Timing
• 10⁵ STORE cycles to EEPROM
• 10 year data retention in EEPROM
• Automatic RECALL on Power Up
• Hardware RECALL Initiation
• Unlimited RECALL cycles from EEPROM
• Single 5V±10% Operation
• Commercial and Industrial Temperatures
• Available in 600 mil PDIP package
DESCRIPTION
The Simtek STK20C04 is a fast static RAM (30, 35,
45ns), with a nonvolatile electrically-erasable PROM
(EEPROM) 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 EEPROM. Data may easily be transferred
from the SRAM to the EEPROM (STORE), or from the
EEPROM to the SRAM (RECALL) using the NE pin. It
combines the high performance and ease of use of a
fast SRAM with nonvolatile data integrity.
The STK20C04 features the industry standard pinout
for nonvolatile RAMs in a 28-pin 600 mil plastic DIP.
LOGIC BLOCK DIAGRAM
EEPROM ARRAY
64 X 64
STORE
A₃
A₄
STATIC RAM
RECALL
A5
ARRAY
A6
64 X 64
A7
A8
DQ0
DQ1
DQ₂
DQ3
DQ4
DQ₅
DQ6
DQ7
COLUMN I/O
COLUMN DECODER
A₀
A₁
A2
PIN CONFIGURATIONS
NE
1
NC
2
A₇
3
A₆
4
A5
5
A₄
6
A₃
7
A₂
A₁
A₀
8
9
10
DQ ₀
11
DQ ₁
12
DO ₂
13
VSS
14
28
V_CC
27
W
26
NC
25
A8
24
NC
23
NC
22
G
21
NC
20
E
19
DQ 7
18
DQ 6
17
DQ 5
16
DQ 4
15
DQ 3
28 - 600 PDIP
STORE/
RECALL
CONTROL
G
NE
E
W
PIN NAMES
A₀ - A₈
W
Address Inputs
Write Enable
DQ₀ - DQ₇
E
Data In/Out
Chip Enable
G
Output Enable
NE
Nonvolatile Enable
V_CC
Power (+5V)
V_SS
Ground
2-39