U631H256 Datasheet, PDF (7/13 Pages) List of Unclassifed Manufacturers – SoftStore 32K x 8 nvSRAM

Nonvolatile Memory Operations
No.
STORE Cycle Inhibit and
Automatic Power Up RECALL
24 Power Up RECALL Duration^k
Low Voltage Trigger Level
k: t_RESTORE starts from the time V_CC rises above V_SWITCH.
Symbol
Alt.
t_RESTORE
V_SWITCH
IEC
STORE Cycle Inhibit and Automatic Power Up RECALL
V_CC
5.0 V
V_SWITCH
U631H256
Min.
Max.
Unit
650
μs
4.0
4.5
V
Power Up
RECALL
Software Mode Selection
(24)
t_RESTORE
t
STORE inhibit
E
W
A13 - A0
(hex)
Mode
I/O
Power
Notes
L
H
L
H
0E38
31C7
03E0
3C1F
303F
0FC0
0E38
31C7
03E0
3C1F
303F
0C63
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile STORE
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Read SRAM
Nonvolatile RECALL
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
Output Data
Output Data
Output Data
Output Data
Output Data
Output High Z
Active
l, m
l, m
l, m
l, m
l, m
I_CC2
l, m
Active
l, m
l, m
l, m
l, m
l, m
l, m
l: The six consecutive addresses must be in order listed. W must be high during all six consecutive cycles. See STORE cycle and RECALL
cycle tables and diagrams for further details.
The following six-address sequence is used for testing purposes and should not be used: 0E38, 31C7, 03E0, 3C1F, 303F, 339C.
m: While there are 15 addresses on the U631H256, only the lower 14 are used to control software modes.
March 31, 2006
STK Control #ML0043
7
Rev 1.0