UL634H256 Просмотр технического описания (PDF) - Unspecified
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UL634H256 Datasheet PDF : 14 Pages
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UL634H256
PowerStore and Automatic Power Up RECALL
VCAP
3.0 V
VSWITCH
PowerStore
Power Up
RECALL
W
DQi
(24)
tRESTORE
tPDSTOREp
t
(24)
tRESTORE
tDELAYp
POWER UP BROWN OUT
RECALL NO STORE
(NO SRAM WRITES)
BROWN OUT
PowerStore
Hardware Controlled STORE
HSB
DQi
Output
tw(H)Sq (28)
tdis(H)S (26)
Previous Data Valid
ten(H)S (27)
High Impedance
td(H)S (25)
Data Valid
No.
Software Controlled STORE/
RECALL Cycle
Symbol
Alt.
IEC
45
Min. Max.
55
Unit
Min. Max.
29 STORE/RECALL Initiation Time
30 Chip Enable to Output Inactives
31 STORE Cycle Time
32 RECALL Cycle Timer
33 Address Setup to Chip Enablet
34 Chip Enable Pulse Widths, t
35 Chip Disable to Address Changet
tAVAV
tcR
45
55
ns
tELQZ tdis(E)SR
600
600
ns
tELQXS
td(E)S
10
10
ms
tELQXR
td(E)R
20
20
µs
tAVELN tsu(A)SR
0
0
ns
tELEHN tw(E)SR
30
40
ns
tEHAXN th(A)SR
0
0
ns
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.
8
January 09, 2002
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