U635H256 Datasheet, PDF (3/13 Pages) Simtek Corporation – PowerStore 32K x 8 nvSRAM

Recommended
Operating Conditions
Power Supply Voltage
Input Low Voltage
Input High Voltage
Symbol
Conditions
V_CC
V_IL
-2 V at Pulse Width
10 ns permitted
V_IH
U635H256
Min.
Max.
Unit
4.5
5.5
V
-0.3
0.8
V
2.2
V_CC+0.3
V
DC Characteristics
Operating Supply Current^b
Average Supply Current during^c
STORE
Operating Supply Current^b
at t_cR = 200 ns
(Cycling CMOS Input Levels)
Average Supply Current during^c
PowerStore Cycle
Standby Supply Current^d
(Cycling TTL Input Levels)
Standby Supply Curent^d
(Stable CMOS Input Levels)
Symbol
Conditions
I_CC1 V_CC = 5.5 V
V_IL = 0.8 V
V_IH = 2.2 V
t_c
= 25 ns
t_c
= 35 ns
t_c
= 45 ns
I_CC2
I_CC3
I_CC4
I_CC(SB)1
V_CC
E
W
V_IL
V_IH
V_CC
W
V_IL
V_IH
V_CC
V_IL
V_IH
V_CC
E
I_CC(SB)
t_c
t_c
t_c
V_CC
E
V_IL
V_IH
= 5.5 V
≤ 0.2 V
≥ V_CC-0.2 V
≤ 0.2 V
≥ V_CC-0.2 V
= 5.5 V
≥ V_CC-0.2 V
≤ 0.2 V
≥ V_CC-0.2 V
= 4.5 V
= 0.2 V
≥ V_CC-0.2 V
= 5.5 V
= V_IH
= 25 ns
= 35 ns
= 45 ns
= 5.5 V
≥ V_CC-0.2 V
≤ 0.2 V
≥ V_CC-0.2 V
C-Type
K-Type
Unit
Min. Max. Min. Max.
95
100 mA
75
80 mA
65
70 mA
6
7 mA
15
15 mA
4
4 mA
40
42 mA
36
38 mA
33
35 mA
3
3 mA
b: I_CC1 and I_CC3 are depedent on output loading and cycle rate. The specified values are obtained with outputs unloaded.
The current I_CC1 is measured for WRITE/READ - ratio of 1/2.
c: I_CC2 and I_CC4 are the average currents required for the duration of the respective STORE cycles.
d: Bringing E ≥ V_IH will not produce standby current levels until any nonvolatile cycle in progress has timed out. See MODE SELECTION
table. The current I_CC(SB)1 is measured for WRITE/READ - ratio of 1/2.
December 12, 1997
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