saa5547ps NXP Semiconductors, saa5547ps Datasheet - Page 74
saa5547ps
Manufacturer Part Number
saa5547ps
Description
Saa550x; Saa554x Tv Microcontrollers With Closed Captioning Cc And On-screen Display Osd
Manufacturer
NXP Semiconductors
Datasheet
1.SAA5547PS.pdf
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Philips Semiconductors
Table 29 I
Notes
1. A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the V
2. The maximum f
3. A fast-mode I
4. C
2000 Feb 23
f
t
t
t
t
t
t
t
t
t
t
C
SCL
BUF
HD;STA
LOW
HIGH
SU;STA
HD;DAT
SU;DAT
r
f
SU;STO
SYMBOL
b
TV microcontrollers with Closed Captioning (CC)
and On-Screen Display (OSD)
signal) in order to bridge the undefined region of the falling edge of SCL.
must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal.
If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line
t
is released.
rmax
b
= total capacitance of one bus line in pF.
+ t
2
C-bus characteristics
SU;DAT
SCL clock frequency
bus free time between a STOP and START condition
hold time (repeated) START condition. After this period, the first
clock pulse is generated.
LOW period of the SCL clock
HIGH period of the SCL clock
set up time for a repeated START condition
data hold time; notes 1 and 2
data set up time; note 3
rise time of both SDA and SCL signals; note 4
fall time of both SDA and SCL signals; note 4
set up time for STOP condition
capacitive load for each bus line
2
C-bus device can be used in a standard-mode I
= 1000 + 250 = 1250 ns (according to the standard-mode I
HD;DAT
has only to be met if the device does not stretch the LOW period t
PARAMETER
74
2
C-bus system, but the requirement t
2
C-bus specification) before the SCL line
0
1.3
0.6
1.3
0.6
0.6
0
100
20
20
0.6
FAST-MODE I
MIN.
LOW
400
0.9
300
300
400
Preliminary specification
of the SCL signal.
2
MAX.
C-bus
IH(min
SAA55xx
SU;DAT
) of the SCL
kHz
ns
ns
ns
pF
s
s
s
s
s
s
s
UNIT
250 ns
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