STK22C48 Просмотр технического описания (PDF) - Unspecified

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производитель

STK22C48

2K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM

Unspecified 

STK22C48

AutoStore™ / POWER-UP RECALL

(VCC = 5.0V ± 10%)e

SYMBOLS

NO.

Standard

Alternate

PARAMETER

STK22C48

MIN MAX

UNITS NOTES

27

tRESTORE

28

tSTORE

tHLHZ

29

tVSBL

30

tDELAY

tBLQZ

31

VSWITCH

32

VRESET

Power-up RECALL Duration

STORE Cycle Duration

Low Voltage Trigger (VSWITCH) to HSB Low

Time Allowed to Complete SRAM Cycle

Low Voltage Trigger Level

Low Voltage Reset Level

550

µs

r

10

ms

p, s

300

ns

l

1

µs

o

4.0

4.5

V

3.6

V

Note r: tRESTORE starts from the time VCC rises above VSWITCH.

Note s: HSB is asserted low for 1µs when VCAP drops through VSWITCH. If an SRAM write has not taken place since the last nonvolatile cycle, HSB will

be released and no STORE will take place.

AutoStore™ / POWER-UP RECALL

VCC

31

VSWITCH

32

VRESET

AutoStoreTM

POWER-UP RECALL

HSB

27

tRESTORE

W

DQ (DATA OUT)

29

tVSBL

30

tDELAY

28

tSTORE

POWER-UP

RECALL

BROWN OUT

NO STORE

(NO SRAM WRITES)

NO RECALL

(VCC DID NOT GO

BELOW VRESET)

BROWN OUT

AutoStore™

NO RECALL

(VCC DID NOT GO

BELOW VRESET)

BROWN OUT

AutoStore™

RECALL WHEN

VCC RETURNS

ABOVE VSWITCH

December 2002

6 Document Control # ML0004 rev 0.0

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