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PSD4235G2 bảng dữ liệu(PDF) 76 Page - STMicroelectronics

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Table 65. Read Timing
Note: 1. RD timing has the same timing as DS, LDS, UDS, and PSEN signals.
2. RD and PSEN have the same timing.
3. Any input used to select an internal PSD function.
4. In multiplexed mode, latched addresses generated from ADIO delay to address output on any Port.
5. RD timing has the same timing as DS, LDS, and UDS signals.
Symbol
Parameter
Conditions
-70
-90
Turbo
Off
Unit
Min
Max
Min
Max
tLVLX
ALE or AS Pulse Width
15
20
ns
tAVLX
Address Setup Time
(Note 3)
46
ns
tLXAX
Address Hold Time
(Note 3)
78
ns
tAVQV
Address Valid to Data Valid
(Note 3)
70
90
+ 12
ns
tSLQV
CS Valid to Data Valid
75
100
ns
tRLQV
RD to Data Valid 8-Bit Bus
(Note 5)
24
32
ns
RD or PSEN to Data Valid
8-Bit Bus, 8031, 80251
(Note 2)
31
38
ns
tRHQX
RD Data Hold Time
(Note 1)
00
ns
tRLRH
RD Pulse Width
(Note 1)
27
32
ns
tRHQZ
RD to Data High-Z
(Note 1)
20
25
ns
tEHEL
E Pulse Width
27
32
ns
tTHEH
R/W Setup Time to Enable
6
10
ns
tELTL
R/W Hold Time After Enable
0
0
ns
tAVPV
Address Input Valid to
Address Output Delay
(Note 4)
20
25
ns



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