STK14C88-M Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – 32K x 8 AUTOSTORE nvSRAM QUANTUM TRAP CMOS NONVOLATILE STATIC RAM

STK14C88-M
32K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
MIL-STD-883
FEATURES
• Nonvolatile Storage without Battery Problems
• 35ns and 45ns Access Times
• “Hands-off” Automatic STORE with External
68µF Capacitor on Power Down
• STORE to EEPROM Initiated by Hardware,
Software or AutoStore™ 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
• 100,000 STORE Cycles to EEPROM
• 10-Year Data Retention in EEPROM
• Single 5V + 10% Operation
• Not Sensitive to Power On/Off Ramp Rates
• No Data Loss from Undershoot
• 32-Pad LCC and 32-Pin 300 mil CDIP Packages
DESCRIPTION
The Simtek STK14C88-M is a fast static RAM with a
nonvolatile, electrically erasable PROM 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 transfers from the SRAM to the
EEPROM (the STORE operation) can take place auto-
matically on power down. A 68µF or larger capacitor
tied from V_CAP to ground guarantees the STORE
operation, regardless of power-down slew rate or
loss of power from “hot swapping”. Transfers from
the EEPROM to the SRAM (the RECALL operation)
take place automatically on restoration of power. Ini-
tiation of STORE and RECALL cycles can also be
software controlled by entering specific read
sequences. A hardware STORE may be initiated with
the HSB pin.
BLOCK DIAGRAM
A₅
A₆
A₇
A₈
A₉
A₁₁
A₁₂
A₁₃
A₁₄
DQ₀
DQ₁
DQ₂
DQ₃
DQ₄
DQ₅
DQ₆
DQ₇
EEPROM ARRAY
512 x 512
STATIC RAM
ARRAY
512 x 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
A₀ A₁ A₂ A₃ A₄ A₁₀
V_CCX V_CAP
POWER
CONTROL
STORE/
RECALL
CONTROL
SOFTWARE
DETECT
PIN CONFIGURATIONS
HSB
VCAP 1
A 14 2
A 12 3
A7 4
A6 5
A5 6
A4 7
A3 8
NC 9
A2 10
A1 11
A0 12
DQ 0 13
DQ 1 14
DQ 2 15
V SS 16
32 VCCX
31 HSB
30 W
29 A13
A
4
5
3
2
1
32 31 30
29
A
28 A8
6
A6
13
28 A
27 A9
5
A7
8
27 A
26 A11
25 G
4
A8
3
9
32
26 A
11
NC 9
25 G
24 NC
A
10
LCC
24 NC
23 A10
2
A
11
23 A
22 E
1
10
A
12
22 E
21
DQ 7
0
DQ
13
21 DQ
20 DQ 6
0 14 15 16 17 18 19 20
7
19 DQ 5
18 DQ 4
17 DQ 3
A₀ - A₁₃
G
E
W
PIN NAMES
A₀ - A₁₄
DQ₀ -DQ₇
E
W
G
HSB
V_CCX
V_CAP
V_SS
Address Inputs
Data In/Out
Chip Enable
Write Enable
Output Enable
Hardware Store Busy (I/O)
Power (+ 5V)
Capacitor
Ground
April 1999
5-43