U632H64
PowerStore and automatic Power Up RECALL
VCAP
5.0 V
VSWITCH
t
PowerStore
p
tPDSTORE
Power Up
RECALL
(24)
(24)
tRESTORE
tRESTOR
E
W
p
tDELAY
DQi
BROWN OUT
NO STORE
(NO S RAM WRITES)
BROWN OUT
PowerStore
POWER UP
RECALL
Hardware Controlled STORE
q (28)
tw(H)S
HSB
DQi
ten(H)S (27)
tdis(H)S
(26)
High Impedance
Data Valid
Previous Data Valid
Output
td(H)S
(25)
Symbol
Software Controlled STORE/
RECALL Cycle
No.
Unit
Alt.
IEC
Min. Max.
29 STORE/RECALL Initiation Time
30 Chip Enable to Output Inactives
31 STORE Cycle Time
tAVAV
tELQZ
tcR
25
ns
tdis(E)SR
td(E)S
600 ns
tELQXS
tELQXR
tAVELN
tELEHN
tEHAXN
10
20
ms
μs
ns
ns
ns
32 RECALL Cycle Timer
td(E)R
33 Address Setup to Chip Enable
34 Chip Enable Pulse Widths, t
35 Chip Disable to Address Change
tsu(A)SR
tw(E)SR
th(A)SR
0
20
0
p: tPDSTORE approximate td(E)S or td(H)S; tDELAY approximate tdis(H)S
q: After tw(H)S HSB is hold down internal by STORE operation.
.
r: An automatic RECALL also takes place at power up, starting when VCC exceeds VSWITCH and takes tRESTORE. VCC must not drop below
VSWITCH once it has been exceeded for the RECALL to function properly.
s: Once the software controlled STORE or RECALL cycle is initiated, it completes automatically, ignoring all inputs.
t: Noise on the E pin may trigger multiple READ cycles from the same address and abort the address sequence.
Rev 1.1
August 15, 2006
STK Control #ML0047
8
SIMTEK [ SIMTEK CORPORATION ]
