U635H16 View Datasheet(PDF) - Zentrum Mikroelektronik Dresden AG
Part Name
Description
Manufacturer
U635H16 Datasheet PDF : 13 Pages
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U635H16
PowerStore and automatic Power Up RECALL
VCC
5.0 V
VSWITCH
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
PowerStore
Power Up
RECALL
W
DQi
24
tRESTORE
t
tPDSTOREp
25
24
tRESTORE
26
tDELAY
POWER UP BROWN OUT
RECALL NO STORE
(NO SRAM WRITES)
BROWN OUT
PowerStore
No.
Software Controlled STORE/
RECALL Cyclek, o
27 STORE/RECALL Initiation Time
28 Chip Enable to Output Inactivep
29 STORE Cycle Timeq
30 RECALL Cycle Timer
31 Address Setup to Chip Enables
32 Chip Enable Pulse Widths, t
33 Chip Disable to Address Changes
Symbol
Alt.
tAVAV
tELQZ
tELQXS
tELQXR
tAVELN
tELEHN
tEHAXN
IEC
tcR
tdis(E)SR
td(E)S
td(E)R
tsu(A)SR
tw(E)SR
th(A)SR
25
35
45
Unit
Min. Max. Min. Max. Min. Max.
25
35
45
ns
600
600
600 ns
10
10
10 ms
20
20
20 µs
0
0
0
ns
20
25
35
ns
0
0
0
ns
o: The software sequence is clocked with E controlled READs.
p: Once the software controlled STORE or RECALL cycle is initiated, it completes automatically, ignoring all inputs.
q : Note that STORE cycles (but not RECALL) are aborted by VCC < VSWITCH (STORE inhibit).
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: Noise on the E pin may trigger multiple READ cycles from the same address and abort the address sequence.
t: If the Chip Enable Pulse Width is less than ta(E) (see Read Cycle) but greater than or equal tw(E)SR, than the data may not be valid at
the end of the low pulse, however the STORE or RECALL will still be initiated.
100
December 12, 1997
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