DS2252T Ver la hoja de datos (PDF) - Maxim Integrated
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DS2252T Datasheet PDF : 16 Pages
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DS2252T
AC CHARACTERISTICS—EXPANDED BUS MODE TIMING SPECIFICATIONS
(VCC = 5V ±10%, TA = 0°C to +70°C.)
# PARAMETER
SYMBOL MIN
MAX UNITS
1 Oscillator Frequency
2 ALE Pulse Width
3 Address Valid to ALE Low
4 Address Hold After ALE Low
14 RD Pulse Width
1/tCLK
tALPW
tAVALL
tAVAAV
tRDPW
1.0
2tCLK - 40
tCLK - 40
tCLK - 35
6tCLK - 100
16 (-16)
MHz
ns
ns
ns
ns
15 WR Pulse Width
tWRPW
6tCLK - 100
ns
16 RD Low to Valid Data In
17 Data Hold after RD High
At 12MHz
At 16MHz
tRDLDV
tRDHDV
5tCLK - 165
ns
5tCLK - 105
0
ns
18 Data Float after RD High
19 ALE Low to Valid Data In
At 12MHz
At 16MHz
tRDHDZ
tALLVD
2tCLK - 70
ns
8CLK - 150
ns
8tCLK - 90
20
Valid Address to Valid Data
In
At 12MHz
At 16MHz
tAVDV
9tCLK - 165
ns
9tCLK - 105
21 ALE Low to RD or WR Low
tALLRDL
3tCLK - 50 3tCLK + 50
ns
22 Address Valid to RD or WR Low
tAVRDL 4tCLK - 130
ns
23 Data Valid to WR Going Low
tDVWRL
tCLK - 60
ns
24 Data Valid to WR High
At 12MHz tDVWRH 7tCLK - 150
ns
At 16MHz
7tCLK - 90
25 Data Valid after WR High
tWRHDV
tCLK - 50
ns
26 RD Low to Address Float
tRDLAZ
0
ns
27 RD or WR High to ALE High
tRDHALH
tCLK - 40
tCLK + 50
ns
EXPANDED DATA MEMORY READ CYCLE
10 of 16
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