MA828 Datasheet, PDF (4/16 Pages) List of Unclassifed Manufacturers – THREE-PHASE PULSE WIDTH MODULATION WAVEFORM GENERATOR

MA828
PWM SWITCHING
INSTANTS
11
TRIANGLE WAVE AT
CARRIER FREQUENCY,
SAMPLING ON 1VE AND 2VE PEAKS
0
POWER WAVEFORM
AS READ FROM
INTERNAL ROM
21
11
RESULTING
PWM
WAVEFORM
0
21
Fig. 3 Asynchronous PWM generation with‘double-edged’ regular sampling as used by the MA828
t1
ALE
RD
t2
WR
t8
CS
t10
AD0-AD7
t15
LATCH ADDRESS
t3
t4
t9
t11
t12
LATCH DATA
Fig. 4 Intel bus timing definitions
Parameter
Symbol Min. Units
ALE high period
t₁
70
ns
Delay time, ALE to WR
t₂
40
ns
WR low period
t₃
200
ns
Delay time,WR high to ALE high t₄
40
ns
CS setup time
t₈
20
ns
CS hold time
t₉
0
ns
Address setup time
t₁₀
30
ns
Address hold time
t₁₅
30
ns
Data setup time
t₁₁
100
ns
Data hold time
t₁₂
30
ns
Table 1 Intel bus timings at V_DD = 5V, T_AMB = 125°C
t1
AS
t2
DS
R/W
t8
CS
t3
t6
t4
t5
t7
t9
t10
t11
AD0-AD7
t15
LATCH ADDRESS
t12
LATCH DATA
Fig. 5 Motorola bus timing definitions
Parameter
Symbol Min. Units
AS high period
t₁
90
ns
Delay time, as low to DS high
t₂
40
ns
DS high period
t₃
210
ns
Delay time, DS low to AS high
t₄
40
ns
DS low period
t₅
200
ns
DS high to R/W low setup time t₆
10
ns
R/W hold time
t₇
10
ns
CS setup time
t₈
20
ns
CS hold time
t₉
0
ns
Address setup time
t₁₀
30
ns
Address hold time
t₁₅
30
ns
Write data setup time
t₁₁
110
ns
Write data hold time
t₁₂
30
ns
Table 2 Motorola bus timings at V_DD = 5V, T_AMB = 125°C
4