DS2251 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated
Part Name
Description
Manufacturer
DS2251 Datasheet PDF : 20 Pages
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PARAMETER
Pin Capacitance
Reset Trip Point in Stop Mode
w/BAT=3.0V
w/BAT=3.3V
SYMBOL MIN TYP
CIN
4.0
4.4
MAX
10
4.25
4.65
UNITS
pF
V
DS2251T
NOTES
5
1
AC CHARACTERISTICS: EXPANDED
BUS MODE TIMING SPECIFICATIONS
# PARAMETER
1 Oscillator Frequency
2 ALE Pulse Width
3 Address Valid to ALE Low
4 Address Hold After ALE Low
5 ALE Low to Valid Instr. In
@ 12 MHz
@ 16 MHz
6 ALE Low to PSEN Low
7 PSEN Pulse Width
8 PSEN Low to Valid Instr. In
@ 12 MHz
@ 16 MHz
9 Input Instr. Hold after PSEN Going High
10 Input Instr. Float after PSEN Going High
11 Address Hold after PSEN Going High
12 Address Valid to Valid Instr. In @ 12 MHz
@ 16 MHz
13 PSEN Low to Address Float
14 RD Pulse Width
15 WR Pulse Width
16 RD Low to Valid Data In
@ 12 MHz
@ 16 MHz
17 Data Hold after RD High
18 Data Float after RD High
19 ALE Low to Valid Data In
@ 12 MHz
@ 16 MHz
20 Valid Addr. to Valid Data In @ 12 MHz
@ 16 MHz
21 ALE Low to RD or WR Low
22 Address Valid to RD or WR Low
23 Data Valid to WR Going Low
24 Data Valid to WR High
@ 12 MHz
(tA=0˚C to70˚C; VCC=5V ± 10%)
SYMBOL MIN
MAX UNITS
1/tCLK
1.0
16 (-16) MHz
tALPW
2tCLK -40
ns
tAVALL
tCLK -40
ns
tAVAAV
tCLK -35
ns
tALLVI
4tCLK -150
ns
4tCLK -90
tALLPSL
tCLK -25
ns
tPSPW
3tCLK -35
ns
tPSLVI
3tCLK -150
ns
3tCLK -90
ns
tPSIV
0
ns
tPSIX
tCLK -20
ns
tPSAV
tCLK -8
ns
tAVVI
5tCLK -150
ns
5tCLK -90
ns
tPSLAZ
0
ns
tRDPW
6tCLK -100
ns
tWRPW
6tCLK -100
ns
tRDLDV
5tCLK -165
ns
5tCLK -105
ns
tRDHDV
0
ns
tRDHDZ
2tCLK -70
ns
tALLVD
8CLK -150
ns
8tCLK -90
ns
tAVDV
9tCLK -165
ns
9tCLK -105
ns
tALLRDL
3tCLK -50
3tCLK +50
ns
tAVRDL
4tCLK -130
ns
tDVWRL
tCLK -60
ns
tDVWRH 7tCLK -150
ns
10 of 20
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