STK12C68-IM Datasheet, PDF (5/10 Pages) List of Unclassifed Manufacturers – CMOS nvSRAM 8K x 8 AutoStore Nonvolatile Static RAM Industrial Temperature/Military Screen

STK12C68-IM
NONVOLATILE MEMORY OPERATION
MODE SELECTION
E
W
HSB
A₁₂ - A₀(hex)
MODE
I/O
POWER
NOTES
H
X
H
X
Not Selected
Output High Z
Standby
L
H
H
X
Read SRAM
Output Data
Active
l
L
L
H
X
Write SRAM
Input Data
Active
L
H
H
0000
Read SRAM
Output Data
Active
k,l
1555
Read SRAM
Output Data
k,l
0AAA
Read SRAM
Output Data
k,l
1FFF
Read SRAM
Output Data
k,l
10F0
Read SRAM
Output Data
k,l
0F0F
Nonvolatile STORE
Output High Z
k
L
H
H
0000
Read SRAM
Output Data
Active
k,l
1555
Read SRAM
Output Data
k,l
0AAA
Read SRAM
Output Data
k,l
1FFF
Read SRAM
Output Data
k,l
10F0
Read SRAM
Output Data
k,l
0F0E
Nonvolatile RECALL
Output High Z
k
X
X
L
X
STORE/Inhibit
Output High Z
I_CC2/Standby
m
Note k: The six consecutive addresses must be in order listed - (0000, 1555, 0AAA, 1FFF, 10F0, 0F0F) for a STORE cycle or (0000, 1555, 0AAA, 1FFF, 10F0,
0F0E) for a RECALL cycle. W must be high during all six consecutive cycles. See STORE cycle and RECALL cycle tables and diagrams for further details.
Note l: I/O state assumes that G ≤ V_IL. Activation of nonvolatile cycles does not depend on the state of G.
Note m: HSB initiated STORE operation actually occurs only if a WRITE has been done since last STORE operation. After the STORE (if any) completes, the
part will go into standby mode inhibiting all operation until HSB rises.
HARDWARE STORE /RECALL
SYMBOLS
NO.
PARAMETER
MIN MAX UNITS
NOTES
22
t_RECALL
RECALL Cycle Duration
23
t_STORE
t_HLHH
STORE Cycle Duration
24
t_DELAY
t_HLQZ
HSB Low to Inhibit On
25
t_RECOVER
t_HHQX
HSB High to Inhibit Off
26
t_ASSERT
t_HLHX
External STORE Pulse Width
V_SWITCH
Low Voltage Trigger Level
I_{HSB_OL}
HSB Output Low Current
I_{HSB_OH}
HSB Output High Current
20
µs
10
ms
1
µs
700
ns
250
ns
4.0
4.5
V
3
mA
5
60
µA
Note o
V_CC ≥ 4.5V
Note e
Note e
HSB = V_OL, Note e, n
HSB = V_IL, Note e, n
Note e: These parameters guaranteed but not tested.
Note n: HSB is an I/O that has a weak internal pullup; it is basically an open drain output. It is meant to allow up to 32 STK12C68-IMs to be ganged together for
simultaneous storing. Do not use HSB to pullup any external circuitry other than other STK12C68 HSB pins.
Note o: A RECALL cycle is initiated automatically at power up when V_CC exceeds V_SWITCH. t_RESTORE is measured from the point at which V_CC exceeds 4.5V.
HARDWARE STORE /RECALL
V_SWITCH
V_CAP
HSB
W
RECALL
24
t_DELAY
22
t_RECALL
26
t_ASSERT
24
t_DELAY
25
t_RECOVER
STORE
SRAM
Inhibit
Power Up RECALL
Brown Out RECALL
23
t_STORE
Power Down STORE
23
t_STORE
HSB Initiated STORE
23
t_STORE
Software STORE
45