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STK15C88
Document Number: 001-50593 Rev. **
Page 8 of 15
AC Switching Characteristics
SRAM Read Cycle
Parameter
Description
25 ns
45 ns
Unit
Min
Max
Min
Max
Cypress
Parameter
Alt
tACE
tELQV
Chip Enable Access Time
25
45
ns
tRC
[5]
tAVAV, tELEH
Read Cycle Time
25
45
ns
tAA
[6]
tAVQV
Address Access Time
25
45
ns
tDOE
tGLQV
Output Enable to Data Valid
10
20
ns
tOHA
[6]
tAXQX
Output Hold After Address Change
5
5
ns
tLZCE
[7]
tELQX
Chip Enable to Output Active
5
5
ns
tHZCE
[7]
tEHQZ
Chip Disable to Output Inactive
10
15
ns
tLZOE
[7]
tGLQX
Output Enable to Output Active
0
0
ns
tHZOE
[7]
tGHQZ
Output Disable to Output Inactive
10
15
ns
tPU
[4]
tELICCH
Chip Enable to Power Active
0
0
ns
tPD
[4]
tEHICCL
Chip Disable to Power Standby
25
45
ns
Switching Waveforms
Figure 5. SRAM Read Cycle 1: Address Controlled [5, 7]
Figure 6. SRAM Read Cycle 2: CE and OE Controlled [5]
Notes
5. WE must be HIGH during SRAM Read Cycles and LOW during SRAM WRITE cycles.
6. I/O state assumes CE and OE < VIL and WE > VIH; device is continuously selected.
7. Measured ±200 mV from steady state output voltage.
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