STK16C88-W20I View Datasheet(PDF) - Simtek Corporation
Part Name
Description
Manufacturer
STK16C88-W20I
Simtek Corporation
STK16C88-W20I Datasheet PDF : 9 Pages
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STK16C88
32K x 8 AutoStorePlus™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
• Transparent Data Save on Power Down
• Internal Capacitor Guarantees AutoStore™
Regardless of Power-Down Slew Rate
• Nonvolatile Storage without Battery Problems
• Directly Replaces 32K x 8 Static RAM, Battery-
Backed RAM or EEPROM
• 20ns, 25ns, 35ns and 45ns Access Times
• STORE to EEPROM Initiated by Software or
AutoStorePlus™ on Power Down
• No Data Loss from Undershoot
• 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 over Full Industrial
Temperature Range
• Commercial and Industrial Temperatures
• 28-Pin PDIP and SOIC Packages
DESCRIPTION
The STK16C88 is a fast SRAM with a nonvolatile
EEPROM element incorporated in each static mem-
ory cell. The SRAM can be read and written an
unlimited number of times, while independent non-
volatile data resides in EEPROM. Data transfers from
the SRAM to the EEPROM (the STORE operation) can
take place automatically on power down. An internal
capacitor guarantees the STORE operation regard-
less of power-down slew rate. Transfers from the
EEPROM to the SRAM (the RECALL operation) take
place automatically on restoration of power. Initia-
tion of STORE and RECALL cycles can also be con-
trolled by entering control sequences on the SRAM
inputs. The STK16C88 is pin-compatible with 32k x
8 SRAMs and battery-backed SRAMs, allowing direct
substitution while enhancing performance. The
STK14C88, which uses an external capacitor, and
the STK15C88, which uses charge stored in system
capacitance, are alternatives for systems needing
AutoStorePlus™ operation.
BLOCK DIAGRAM
EEPROM ARRAY
512 x 512
A5
A6
STORE
A7
A8
A9
STATIC RAM
ARRAY
RECALL
A11
512 x 512
A12
A13
A14
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4A10
STORE/
RECALL
CONTROL
VCC
POWER
CONTROL
INTERNAL
CAPACITOR
SOFTWARE
DETECT
A0 - A13
G
E
W
PIN CONFIGURATIONS
A14 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
VSS 14
28 VCC
27 W
26 A13
25 A8
24 A9
23 A11
22 G
21 A10
20 E
19 DQ7
18 DQ6
17 DQ5 28 - 600 PDIP
16 DQ4 28 - 350 SOIC*
15 DQ3 *see order info
PIN NAMES
A0 - A14
W
Address Inputs
Write Enable
DQ0 - DQ7
E
Data In/Out
Chip Enable
G
Output Enable
VCC
Power (+ 5V)
VSS
Ground
July 1999
5-65
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