LH540245M-35 データシートの表示（PDF） - Sharp Electronics
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LH540245M-35 Datasheet PDF : 46 Pages
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2048 x 18/4096 x 18 Synchronous FIFOs
LH540235/45
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
–20
–25
-35
MIN. MAX. MIN. MAX. MIN. MAX.
fCC
Clock Cycle Frequency
50
40
28.6
tA
Data Access Time
2 12 3 15 3 20
tCLK
Clock Cycle Time
20
25
35
tCLKH
Clock HIGH Time
8
10
14
tCLKL
Clock LOW Time
8
10
14
tDS
Data Setup Time
5
6
7
tDH
Data Hold Time
2
2
2
tENS
Enable Setup Time
5
6
7
tENH
Enable Hold Time
tRS
Reset Pulse Width 1
tRSS
Reset Setup Time 2
tRSR
Reset Recovery Time 2
2
2
2
20
25
35
12
15
20
12
15
20
tRSF
Reset to Flag and Output Time
tOLZ
Output Enable to Output in Low-Z 2
30
35
40
0
0
0
tOE
Output Enable to Output Valid
tOHZ
Output Enable to Output in High-Z 2
9
12
15
1
9
1 12 1 15
tWFF
Write Clock to Full Flag
12
15
20
tREF
Read Clock to Empty Flag
12
15
20
tPAF
Clock to Programmable Almost-Full Flag (IDT-Compatible
Operating Mode)
14
17
23
tPAE
Clock to Programmable Almost-Empty Flag (IDT-Compatible
Operating Mode)
14
17
23
tHF
Clock to Half-Full Flag (IDT-Compatible Operating Mode)
14
17
23
tPAFS
Clock to Programmable Almost-Full Flag (Enhanced
Operating Mode)
14
17
23
tPAES
Clock to Programmable Almost-Empty Flag (Enhanced
Operating Mode)
14
17
23
tHFS
Clock to Half-Full Flag (Enhanced Operating Mode)
14
17
23
tXO
Clock to Expansion-Out
12
15
20
tXI
Expansion-In Pulse Width
8
9
13
tXIS
Expansion-In Setup Time
8
tSKEW1 Skew Time Between Read Clock and Write Clock for Full Flag 3
9
tSKEW2 Skew Time Between Write Clock and Read Clock for Empty Flag 4
9
9
14
11
16
11
16
NOTES:
1. Pulse widths less than the stated minimum values may cause incorrect operation.
2. Values are guaranteed by design; not currently tested.
3. These times also apply to the Programmable-Almost-Full and Half-Full flags when they are synchronized to WCLK.
4. These times also apply to the Half-Full and Programmable-Almost-Empty flags when they are synchronized to RCLK.
BOLD ITALIC = Enhanced Operating Mode
Rev. B, 8/8/96
9
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