CY7C344
CY7C344B
7
External Synchronous Switching Characteristics[7] Over Operating Range (continued)
7C344–20
7C344B–20
7C344–25
7C344B–25
Parameter
Description
Min.
Max.
Min.
Max.
Unit
fMAX1
External Maximum Frequency(1/(tCO1 + tS))
[4, 14]
Com’l/Ind
41.6
33.3
MHz
Mil
41.6
33.3
fMAX2
Maximum Frequency with Internal Only Feedback
(1/(tCF + tS))
[4, 15]
Com’l/Ind
62.5
45.4
MHz
Mil
62.5
45.4
fMAX3
Data Path Maximum Frequency, least of 1/(tWL + tWH),
1/(tS + tH), or (1/tCO1)
[4, 16]
Com’l/Ind
71.4
62.5
MHz
Mil
71.4
62.5
fMAX4
Maximum Register Toggle Frequency 1/(tWL + tWH)
[4, 17]
Com’l/Ind
71.4
62.5
MHz
Mil
71.4
62.5
tOH
Output Data Stable Time from
Synchronous Clock Input[4, 18]
Com’l/ Ind
3
3
ns
Mil
3
3
External Asynchronous Switching Characteristics Over Operating Range[7]
7C344B–10
7C344B–12
7C344–15
7C344B–15
Parameter
Description
Min.
Max.
Min.
Max.
Min.
Max.
Unit
tACO1
Asynchronous Clock Input to Output Delay
Com’l/ Ind
10
12
15
ns
Mil
12
15
tACO2
Asynchronous Clock Input to Local Feedback to
Combinatorial Output[19]
Com’l/Ind
15
18
30
ns
Mil
18
30
tAS
Dedicated Input or Feedback Set-Up Time to
Asynchronous Clock Input
Com’l/Ind
4
4
7
ns
Mil
4
7
tAH
Input Hold Time from Asynchronous Clock Input
Com’l/Ind
3
4
7
ns
Mil
4
7
tAWH
Asynchronous Clock Input HIGH Time[4, 20]
Com’l/Ind
4
5
6
ns
Mil
5
6
tAWL
Asynchronous Clock Input LOW Time[4]
Com’l/Ind
5
6
7
ns
Mil
6
7
tACF
Asynchronous Clock to Local Feedback Input[4,
21]
Com’l /Ind
7
9
18
ns
Mil
9
18
tAP
External Asynchronous Clock Period (1/fMAX4)
[4]
Com’l/Ind
12
12.5
13
ns
Mil
12.5
13
fMAXA1
External Maximum Frequency in Asynchronous
Mode 1/(tACO1 + tAS)
[4, 22]
Com’l/Ind
71.4
62.5
45.4
MHz
Mil
62.5
45.4
fMAXA2
Maximum Internal Asynchronous Frequency
1/(tACF + tAS) or 1/(tAWH + tAWL)
[4, 23]
Com’l/Ind
90.9
76.9
40
MHz
Mil
76.9
40
fMAXA3
Data Path Maximum Frequency in Asynchronous
Mode[4, 24]
Com’l/Ind
100.0
83.3
66.6
MHz
Mil
83.3
66.6
fMAXA4
Maximum Asynchronous Register Toggle Fre-
quency 1/(tAWH + tAWL)
[4, 25]
Com’l /Ind
111.1
90.9
76.9
MHz
Mil
90.9
76.9
tAOH
Output Data Stable Time from Asynchronous
Clock Input[4, 26]
Com’l/Ind
12
12
15
ns
Mil
15
Shaded area contains preliminary information.
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