STK14C88 datasheet(10/19 Pages) SIMTEK

Part #	STK14C88

Description	32Kx8 AutoStore nvSRAM

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Manufacturer	SIMTEK [Simtek Corporation]

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10

February, 2007

Document Control #ML0014 Rev 0.3

STK14C88

SOFTWARE NONVOLATILE RECALL

A software RECALL cycle is initiated with a sequence

of READ operations in a manner similar to the soft-

ware STORE initiation. To initiate the RECALL cycle,

the following sequence of E controlled READ opera-

tions must be performed:

1.

Read address

0E38 (hex)

Valid READ

2.

Read address

31C7 (hex)

Valid READ

3.

Read address

03E0 (hex)

Valid READ

4.

Read address

3C1F (hex)

Valid READ

5.

Read address

303F (hex)

Valid READ

6.

Read address

0C63 (hex)

Initiate RECALL cycle

Internally, RECALL is a two-step procedure. First, the

SRAM

data is cleared, and second, the nonvolatile

information is transferred into the SRAM cells. After

the t

RECALL cycle time the SRAM will once again be

ready for READ and WRITE operations. The RECALL

operation in no way alters the data in the nonvolatile

elements. The nonvolatile data can be recalled an

unlimited number of times.

AutoStore OPERATION

The STK14C88 can be powered in one of three

modes.

During normal AutoStore operation, the STK14C88

will draw current from V

CCX to charge a capacitor

connected to the V

CAP pin. This stored charge will be

used by the chip to perform a single STORE opera-

tion. After power up, when the voltage on the V

CAP

pin drops below V

SWITCH, the part will automatically

disconnect the V

CAP

pin from V

CCX

and initiate a

STORE

operation.

Figure 2 shows the proper connection of capacitors

for automatic store operation. A charge storage

capacitor having a capacity of between 68

μF and

220

μF (± 20%) rated at 6V should be provided.

In system power mode (Figure 3), both V

CCX and

V

CAP are connected to the + 5V power supply without

the 68

μF capacitor. In this mode the AutoStore func-

tion of the STK14C88 will operate on the stored sys-

tem charge as power goes down. The user must,

however, guarantee that V

CCX does not drop below

3.6V during the 10ms STORE cycle.

If an automatic STORE on power loss is not required,

then V

CCX can be tied to ground and + 5V applied to

V

CAP (Figure 4). This is the AutoStore Inhibit mode,

in which the AutoStore function is disabled. If the

STK14C88 is operated in this configuration, refer-

ences to V

CCX should be changed to VCAP throughout

this data sheet. In this mode, STORE operations may

be triggered through software control or the HSB

pin. It is not permissable to change between these

three options “on the fly”.

In order to prevent unneeded STORE operations,

automatic STOREs as well as those initiated by

externally driving HSB low will be ignored unless at

least one WRITE operation has taken place since the

most recent STORE or RECALL cycle. Software-

initiated STORE cycles are performed regardless of

whether a WRITE operation has taken place.

If the power supply drops faster than 20

μs/volt

before V

CCX reaches VSWITCH, then a 2.2 ohm resistor

should be inserted between V

CCX and the

system

supply to avoid momentary excess of current

between Vccx and Vcap.

Figure 2: AutoStore Mode

1

16

32

31

17

30

+

10k

Ω∗

Figure 3: System Power Mode

1

16

32

31

17

30

Figure 4: AutoStore

Inhibit Mode

1

16

32

31

17

30

*If HSB is not used, it should be left unconnected.

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