STK14D88-RF45 Cypress Semiconductor Corp, STK14D88-RF45 Datasheet - Page 14

• Manufacturer Part Number: STK14D88-RF45
• Description: IC NVSRAM 256KBIT 45NS 48SSOP
• Manufacturer: Cypress Semiconductor Corp

Specifications of STK14D88-RF45

• Format - Memory: RAM
• Memory Type: NVSRAM (Non-Volatile SRAM)
• Memory Size: 256K (32K x 8)
• Speed: 45ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 13. Current versus Cycle Time
Noise Considerations
The STK14D88 is a high speed memory and so must have a high
frequency bypass capacitor of 0.1 µF connected between both
V
Use leads and traces that are as short as possible. As with all
high speed CMOS ICs, careful routing of power, ground, and
signals will reduce circuit noise.
Document Number: 001-52037 Rev. *A
CC
pins and V
50
40
30
20
10
0
SS
ground plane with no plane break to chip V
50
Cycle Time (ns)
100 150 200 300
Writes
Reads
SS
.
Preventing AutoStore
The AutoStore function can be disabled by initiating an
AutoStore Disable sequence. A sequence of READ operations
is performed in a manner similar to the software STORE initi-
ation. To initiate the AutoStore Disable sequence, the following
sequence of E controlled or G controlled READ operations must
be performed:
The AutoStore can be re-enabled by initiating an AutoStore
Enable sequence. A sequence of READ operations is performed
in a manner similar to the software RECALL initiation. To initiate
the AutoStore Enable sequence, the following sequence of E
controlled or G controlled READ operations must be performed:
If the AutoStore function is disabled or re-enabled, a manual
STORE operation (Hardware or Software) needs to be issued to
save the AutoStore state through subsequent power down
cycles. The part comes from the factory with AutoStore enabled.
In all cases, make sure the READ sequence is uninterrupted. For
example, an interrupt that occurs in the sequence that reads the
nvSRAM would abort this sequence, resulting in an error.
1. Read Address 0x0E38, Valid READ
2. Read Address 0x31C7, Valid READ
3. Read Address 0x03E0, Valid READ
4. Read Address 0x3C1F, Valid READ
5. Read Address 0x303F, Valid READ
6. Read Address 0x03F8, AutoStore Disable
1. Read Address 0x0E38, Valid READ
2. Read Address 0x31C7, Valid READ
3. Read Address 0x03E0, Valid READ
4. Read Address 0x3C1F, Valid READ
5. Read Address 0x303F, Valid READ
6. Read Address 0x07F0, AutoStore Enable
STK14D88
Page 14 of 18
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