STK14C88-N25 查看數據表（PDF） - Simtek Corporation
零件编号
产品描述 (功能)
生产厂家
STK14C88-N25 Datasheet PDF : 12 Pages
| |||
STK14C88
32K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
• 20ns, 25ns, 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 ICC at 200ns Cycle Time
• Unlimited READ, WRITE and RECALL Cycles
• 1,000,000 STORE Cycles to EEPROM
• 100-Year Data Retention in EEPROM
• Single 5V + 10% Operation
• Not Sensitive to Power On/Off Ramp Rates
• No Data Loss from Undershoot
• Commercial and Industrial Temperatures
• 32-Pin SOIC and DIP Packages
DESCRIPTION
The Simtek STK14C88 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
automatically on power down. A 68µF or larger
capacitor tied from VCAP 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 opera-
tion) take place automatically on restoration of
power. Initiation 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
VCCX VCAP
POWER
CONTROL
STORE/
RECALL
CONTROL
SOFTWARE
DETECT
PIN CONFIGURATIONS
VCAP 1
A14 2
A12 3
A7 4
A6 5
A5 6
A4 7
A3 8
NC 9
HSB
A2 10
A1 11
A0 12
DQ0 13
DQ1 14
DQ2 15
VSS 16
32 VCCX
31 HSB
30 W
29 A13
28 A8
27 A9
26 A11
25 G
24 NC
23 A10
22 E
21 DQ7
20 DQ6
19
18
DQ5
DQ4
32 - 300 SOIC
17 DQ3 32 - 600 PDIP
A0 - A13
PIN NAMES
A0 - A14
DQ0 -DQ7
E
Address Inputs
Data In/Out
Chip Enable
W
G
G
Write Enable
Output Enable
HSB
E
W
VCCX
VCAP
VSS
Hardware Store Busy (I/O)
Power (+ 5V)
Capacitor
Ground
July 1999
5-21
Share Link: 