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参数资料
| 型号： | HPC167064EL |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | High-Performance microController with a 16k UV Erasable CMOS EPROM |
| 中文描述： | 高性能的16K的紫外线可擦除的CMOS存储器微控制器 |
| 文件页数： | 31/34页 |
| 文件大小： | 415K |
| 代理商： | HPC167064EL |
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30 MHz
AC Electrical Characteristics (Continued)
(See Notes 1 and 4 and
Figures 1 thru 5 ) VCC e 5V g10% TA e 0 Cto a70 C for HPC467064 (Continued)
Symbol and Formula
Parameter
Min
Max
Units
Notes
tARR e
tC b 5
ALE Falling Edge to RD Falling Edge
12
ns
tACC e tC a WS b 32
Data Input Valid after Address Output Valid
100
ns
tRD e
tC a WS b 39
Data Input Valid after RD Falling Edge
60
ns
tRW e
tC a WS b 14
RD Pulse Width
85
ns
tDR e
tC b 15
Hold of Data Input Valid after RD Rising Edge
0
35
ns
tRDA e tC b 15
Bus Enable after RD Rising Edge
51
ns
tARW e
tC b 5
ALE Falling Edge to WR Falling Edge
28
ns
tWW e
tC a WS b 15
WR Pulse Width
101
ns
tV e
tC a WS b 5
Data Output Valid before WR Rising Edge
94
ns
tHW e
tC b 10
Hold of Data Valid after WR Rising Edge
7
ns
tDAR e
tC a WS b 50
Falling Edge of ALE to Falling Edge of RDY
33
ns
tRWR e tC
RDY Pulse Width
66
ns
Read
Cycles
Write
Cycles
Ready
Input
This maximum frequency is attainable provided that this external baud clock has a duty cycle such that the high period includes two (2) falling edges of the CK2
clock
Note
CL e 40 pF
Note 1
These AC Characteristics are guaranteed with external clock drive on CKI having 50% duty cycle and with less than 15 pF load on CKO with rise and fall
times (tCKIR and tCKIL) on CKI input less than 25 ns
Note 2
Do not design with this parameter unless CKI is driven with an active signal When using a passive crystal circuit its stability is not guaranteed if either CKI
or CKO is connected to any external logic other than the passive components of the crystal circuit
Note 3
tHAE is spec’d for case with HLD falling edge occurring at the latest time can be accepted during the present CPU cycle being executed If HLD falling edge
occurs later tHAE may be as long as (3tC a 4WS a 72tC a 100) depending on the following CPU instruction cycles its wait states and ready input
Note 4
WS e tWAIT c (number of pre-programmed wait states) Minimum and maximum values are calculated at maximum operating frequency tc e 3000 MHz
with one wait state programmed
Note 5
Due to emulation restrictionsactual limits will be better
Note 6
Due to tester limitationsactual limits will be better
CKI Input Signal Characteristics
RiseFall Time
TLDD11046 – 2
Duty Cycle
TLDD11046 – 3
FIGURE 1 CKI Input Signal
6
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