Cypress Semiconductor STK14C88-3 Bedienungsanleitung Seite 2

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AN55662
October 5, 2009 Document No. 001-55662 Rev. ** 2
Parameters
The CY14B256LA is a drop in replacement for STK14C88-3 and requires minimum changes in the application board.
However, the differences in parameters should be considered before replacing one part with the other. Table 5 lists the
differences in parameters between STK14C88-3 and CY14B256LA.
Table 5. Parameter Comparison
Parameter
Description
Speed
STK14C88-3
CY14B256LA
Unit
Min
Max
Min
Max
DC Parameters
V
CC
Power Supply
3.0
3.6
2.7
3.6
V
I
CC1
Average V
CC
Current
25 ns
- 70
mA
35 ns
52
-
45 ns
44
52
I
CC2
Average V
CC
Current
during STORE
3 10
mA
I
CC3
Average V
CC
Current at
t
RC
= 200 ns, V
CC
typ, 25°C
9 (typ) 35 (typ)
I
CC4
Average V
CAP
Current
during AutoStore Cycle
2 5
mA
I
SB1
Average
V
CC
Standby Current
(Standby,
Cycling Input)
35 ns
19
Not specified
mA
45 ns
17
I
SB
V
CC
Standby Current
1
5
mA
V
IH
Input High Voltage
2.2
2
V
V
OH
Output HIGH Voltage
2.4
(I
OUT
= -4 mA)
2.4
(I
OUT
= -2 mA)
V
V
OL
Output LOW Voltage
0.4
(I
OUT
= 8 mA)
0.4
(I
OUT
= 4 mA)
V
V
CAP
Storage Capacitor
54 to 264
61 to 180
uF
AC Switching Parameters
t
OHA
Output Hold After Address Change
5
3
ns
t
LZCE
Chip Enable to Output Active
5
3
ns
t
LZWE
Output Active After End of Write
5
3
ns
AutoStore / Power Up RECALL Parameters
t
HRECALL
Power Up RECALL Duration
0.55
20
ms
t
STORE
STORE Cycle Duration
10
8
ms
t
VSBL
Low Voltage Trigger (V
SWITCH
) to low
300 25
ns
t
RESET
Low Voltage Reset Level
2.4
Not Applicable
V
t
SWITCH
Low Voltage Trigger Level
2.7
2.95
2.65
V
t
DELAY
Time Allowed to Complete SRAM Cycle
1,000
25
ns
V
HDIS
Output Disable Voltage
Not specified
1.9
V
t
LZHSB
To Output Active Time
Not specified
5
us
t
HHHD
High Active Time
Not specified
500
ns
Software Controlled STORE/RECALL Cycle Parameters
t
HA
Address Hold Time
20
0
ns
t
RECALL
STORE Cycle Duration
20
200
us
Hardware STORE Cycle Parameters
t
HLBL
LOW to STORE Busy
300
25 (t
DELAY
)
ns
t
DHSB
To Output Active Time
700
25
ns
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