DS2251T Просмотр технического описания (PDF) - Maxim Integrated
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DS2251T Datasheet PDF : 22 Pages
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DS2251T
DC CHARACTERISTICS (continued)
(VCC = 5V ±10%, TA = 0˚C to +70˚C.)
PARAMETER
SYMBOL MIN TYP
Idle Mode Current at 12MHz
IIDLE
Stop Mode Current
ISTOP
Pin Capacitance
CIN
Reset Trip Point in
With BAT =
3.0V
4.0
Stop Mode
With BAT =
3.3V
4.4
MAX
7.0
80
10
4.25
4.65
UNITS
mA
µA
pF
NOTES
3
4
5
V
1
AC CHARACTERISTICS—EXPANDED BUS MODE TIMING SPECIFICATIONS
(VCC = 5V ±10%, TA = 0˚C to +70˚C.)
# PARAMETER
SYMBOL MIN
MAX UNITS
1 Oscillator Frequency
1/tCLK
1.0
16 (-16) MHz
2 ALE Pulse Width
tALPW
2tCLK - 40
ns
3 Address Valid to ALE Low
tAVALL
tCLK - 40
ns
4 Address Hold After ALE Low
tAVAAV
tCLK - 35
ns
5
ALE Low to Valid Instruction
In
At 12MHz
At 16MHz
tALLVI
4tCLK - 150
ns
4tCLK - 90
6 ALE Low to PSEN Low
tALLPSL
tCLK - 25
ns
7 PSEN Pulse Width
tPSPW
3tCLK - 35
ns
8 PSEN Low to Valid
Instruction In
At 12MHz
At 16MHz
tPSLVI
3tCLK - 150
ns
3tCLK - 90
9 Input Instr. Hold after PSEN Going High
tPSIV
0
ns
10 Input Instr. Float after PSEN Going High
tPSIX
tCLK - 20
ns
11 Address Hold after PSEN Going High
tPSAV
tCLK - 8
ns
12
Address Valid to Valid
Instruction In
At 12MHz
At 16MHz
tAVVI
5tCLK - 150
ns
5tCLK - 90
13 PSEN Low to Address Float
tPSLAZ
0
ns
14 RD Pulse Width
tRDPW
6tCLK - 100
ns
15 WR Pulse Width
tWRPW
6tCLK - 100
ns
16 RD Low to Valid Data In
At 12MHz
At 16MHz
tRDLDV
5tCLK - 165
ns
5tCLK - 105
17 Data Hold after RD High
tRDHDV
0
ns
18 Data Float after RD High
tRDHDZ
2tCLK - 70
ns
19 ALE Low to Valid Data In
At 12MHz
tALLVD
8CLK - 150
ns
10 of 22
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