U635H256 Datasheet, PDF (9/13 Pages) Simtek Corporation – PowerStore 32K x 8 nvSRAM

U635H256
SOFTWARE CONTROLLED STORE/RECALL CYCLE^{t, u, v} (E = HIGH after STORE initiation)
Ai AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
27
t_cR
ADDRESS 1
27
t_cR
ADDRESS 6
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
32
E
31
t_{w(E)SR 33}
t_su(A)SR
t_h(A)SR
DQi ^{High Impedance} VALID
Output
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
29 / 30
t_d(E)S / t_d(E)R
VALI D
28
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
t_dis(E)SR
SOFTWARE CONTROLLED STORE/RECALL CYCLE^{t, u, v, w} (E = LOW after STORE initiation)
Ai _{AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA}
29
t_cR
ADDRESS 1
34
E
33
t_w(E)SR
35
t_su(A)SR
t_h(A)SR
DQi
Output
High Impedance _VALID
33
t_{su(A )SR}
ADDRESS 6
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
35
t_{h(A)SR AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA}
31 / 32
t_d(E)S / t_d(E)R
VALID
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
30
t_dis(E)SR
u: W must be HIGH when E is LOW during the address sequence in order to initiate a nonvolatile cycle. G may be either HIGH or LOW
throughout. Addresses 1 through 6 are found in the mode selection table. Address 6 determines wheter the U635H256 performs a STORE
or RECALL.
v: E must be used to clock in the address sequence for the Software controlled STORE and RECALL cycles.
December 12, 1997
9