CY7C4255-10AXC(2005) 查看數據表（PDF） - Cypress Semiconductor
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CY7C4255-10AXC Datasheet PDF : 22 Pages
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CY7C4255
CY7C4265
AC Test Loads and Waveforms[9, 10]
5V
OUTPUT
R1 1.1 KΩ
CL
INCLUDING
JIG AND
SCOPE
R2
680Ω
3.0V
GND
≤ 3 ns
ALL INPUT PULSES
90%
10%
90%
10%
≤ 3 ns
Equivalent to:
THÉVENIN EQUIVALENT
410Ω
OUTPUT
1.91V
Switching Characteristics Over the Operating Range
7C42X5-10
Parameter
Description
Min. Max.
tS
Clock Cycle Frequency
100
tA
Data Access Time
2
8
tCLK
Clock Cycle Time
10
tCLKH
Clock HIGH Time
4.5
tCLKL
Clock LOW Time
4.5
tDS
Data Set-Up Time
3
tDH
Data Hold Time
0.5
tENS
Enable Set-Up Time
3
tENH
Enable Hold Time
0.5
tRS
Reset Pulse Width[11]
10
tRSR
Reset Recovery Time
8
tRSF
Reset to Flag and Output Time
10
tPRT
Retransmit Pulse Width
30
tRTR
Retransmit Recovery Time
60
tOLZ
Output Enable to Output in Low Z[12]
0
tOE
tOHZ
Output Enable to Output Valid
Output Enable to Output in High Z[12]
3
7
3
7
tWFF
Write Clock to Full Flag
8
tREF
Read Clock to Empty Flag
8
tPAFasynch Clock to Programmable Almost-Full Flag[13]
12
(Asynchronous mode, VCC/SMODE tied to VCC)
tPAFsynch Clock to Programmable Almost-Full Flag
8
(Synchronous mode, VCC/SMODE tied to VSS)
tPAEasynch Clock to Programmable Almost-Empty Flag[13]
12
(Asynchronous mode, VCC/SMODE tied to VCC)
tPAEsynch Clock to Programmable Almost-Full Flag
8
(Synchronous mode, VCC/SMODE tied to VSS)
tHF
Clock to Half-Full Flag
12
tXO
Clock to Expansion Out
6
Notes:
9. CL = 30 pF for all AC parameters except for tOHZ.
10. CL = 5 pF for tOHZ.
11. Pulse widths less than minimum values are not allowed.
12. Values guaranteed by design, not currently tested.
13. tPAFasynch, tPAEasynch, after program register write will not be valid until 5 ns + tPAF(E).
7C42X5-15
Min. Max.
66.7
2 10
15
6
6
4
1
4
1
15
10
15
35
65
0
3
8
3
8
10
10
16
10
16
10
16
10
7C42X5-25
Min. Max.
40
2 15
25
10
10
6
1
6
1
25
15
25
45
75
0
3 12
3 12
15
15
20
15
20
15
20
15
7C42X5-35
Min. Max.
28.6
2 20
35
14
14
7
2
7
2
35
20
35
55
85
0
3 15
3 15
20
20
25
20
25
20
25
20
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Document #: 38-06004 Rev. *C
Page 5 of 22
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