CY7C344
Document #: 38-03006 Rev. **
Page 4 of 15
External Synchronous Switching Characteristics[7] Over Operating Range
7C344-15
7C344-20
7C344-25
Parameter
Description
Min.
Max.
Min.
Max.
Min.
Max.
Unit
tPD1
Dedicated Input to Combinatorial Output Delay[8] Com’l/Ind
15
20
25
ns
Mil
15
20
25
tPD2
I/O Input to Combinatorial Output Delay[9]
Com’l/Ind
15
20
25
ns
Mil
15
20
25
tPD3
Dedicated Input to Combinatorial Output Delay
with Expander Delay[10]
Com’l/Ind
30
30
40
ns
Mil
30
30
40
tPD4
I/O Input to Combinatorial Output Delay with
Expander Delay[4, 11]
Com’l/Ind
30
30
40
ns
Mil
30
30
40
tEA
Input to Output Enable Delay[4]
Com’l/Ind
20
20
25
ns
Mil
20
20
25
tER
Input to Output Disable Delay[4]
Com’l/Ind
20
20
25
ns
Mil
20
20
25
tCO1
Synchronous Clock Input to Output Delay
Com’l/Ind
10
12
15
ns
Mil
10
12
15
tCO2
Synchronous Clock to Local Feedback to Com-
binatorial Output[4, 12]
Com’l/Ind
20
22
29
ns
Mil
20
22
29
tS
Dedicated Input or Feedback Set-Up Time to
Synchronous Clock Input
Com’l/Ind
10
12
15
ns
Mil
10
12
15
tH
Input Hold Time from Synchronous Clock Input[7] Com’l/Ind
0
0
0
ns
Mil
0
0
0
tWH
Synchronous Clock Input HIGH Time[4]
Com’l/Ind
6
7
8
ns
Mil
6
7
8
tWL
Synchronous Clock Input LOW Time[4]
Com’l/Ind
6
7
8
ns
Mil
6
7
8
tRW
Asynchronous Clear Width[4]
Com’l/Ind
20
20
25
ns
Mil
20
20
25
tRR
Asynchronous Clear Recovery Time[4]
Com’l/Ind
20
20
25
ns
Mil
20
20
25
tRO
Asynchronous Clear to Registered Output
Delay[4]
Com’l/Ind
15
20
25
ns
Mil
15
20
25
tPW
Asynchronous Preset Width[4]
Com’l /Ind
20
20
25
ns
Mil
20
20
25
tPR
Asynchronous Preset Recovery Time[4]
Com’l /Ind
20
20
25
ns
Mil
20
20
25
tPO
Asynchronous Preset to Registered Output
Delay[4]
Com’l /Ind
15
20
25
ns
Mil
15
20
25
tCF
Synchronous Clock to Local Feedback Input[4, 13] Com’l /Ind
4
4
7
ns
Mil
4
4
7
tP
External Synchronous Clock Period (1/fMAX3)
[4]
Com’l/Ind
13
14
16
ns
Mil
13
14
16
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