U632H16 데이터 시트보기 (PDF) - Simtek Corporation
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U632H16 Datasheet PDF : 15 Pages
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U632H16
PowerStore and automatic Power Up RECALL
VCAP
5.0 V
VSWITCH
PowerStore
Power Up
RECALL
W
DQi
(24)
tRESTORE
tPDSTOREp
t
(24)
tRESTORE
tDELAYp
Hardware Controlled Store
POWER UP BROWN OUT
RECALL
NO STORE
(NO SRAM WRITES)
BROWN OUT
PowerStore
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
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 Enable
34 Chip Enable Pulse Widths, t
35 Chip Disable to Address Change
tAVAV
tELQZ
tELQXS
tELQXR
tAVELN
tELEHN
tEHAXN
tcR
25
ns
tdis(E)SR
600 ns
td(E)S
10 ms
td(E)R
20 μs
tsu(A)SR
0
ns
tw(E)SR 20
ns
th(A)SR
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.
STK Control #ML0046
8
Rev 1.1
August 15, 2006
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