sa828 Mitel, sa828 Datasheet - Page 4

• Manufacturer Part Number: sa828
• Description: Three-phase Pwm Waveform Generator
• Manufacturer: Mitel

ALE high period
Delay time, ALE to WR
WR low period
Delay time, WR high to ALE high
CS setup time
CS hold time
Address setup time
Address hold time
Data setup time
Data hold time
4
SA828
ALE
AD
WR
RD
CS
Table 1 Intel bus timings at V
0
-AD
7
t
Parameter
LATCH ADDRESS
8
t
1
t
10
Fig. 4 Intel bus timing definitions
Fig. 3 Asynchronous PWM generation with‘double-edged’ regular sampling as used by the SA828
+1
– 1
+1
– 1
0
0
PWM SWITCHING
t
2
INSTANTS
t
15
t
3
DD
Symbol
t
11
= 5V, T
t
t
t
t
t
t
t
t
t
t
t
10
15
11
12
1
2
3
4
8
9
9
LATCH DATA
SAMPLING ON +VE AND – VE PEAKS
AMB
Min.
200
100
70
40
40
20
30
30
25
0
CARRIER FREQUENCY,
TRIANGLE WAVE AT
= + 25 C
t
t
12
4
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
AS high period
Delay time, as low to DS high
DS high period
Delay time, DS low to AS high
DS low period
DS high to R/W low setup time
R/W hold time
CS setup time
CS hold time
Address setup time
Address hold time
Write data setup time
Write data hold time
Table 2 Motorola bus timings at V
R/W
AD
AS
DS
CS
0
-AD
Parameter
7
t
8
Fig. 5 Motorola bus timing definitions
LATCH ADDRESS
t
t
1
2
t
10
t
15
t
6
t
3
POWER WAVEFORM
t
LATCH DATA
11
Symbol
AS READ FROM
INTERNAL ROM
DD
WAVEFORM
RESULTING
t
t
t
t
t
t
t
t
t
t
t
t
t
10
15
11
12
1
2
3
4
5
6
7
8
9
= 5V, T
PWM
t
12
t
7
Min.
210
200
110
t
t
t
90
40
40
10
10
20
30
30
30
4
9
AMB
0
5
= +25 C
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns