參數(shù)資料
型號(hào)： PTN3500
廠商： NXP Semiconductors N.V.
英文描述： Maintenance and control device
中文描述： 維護(hù)和控制裝置
文件頁數(shù)： 6/15頁
文件大小： 115K
代理商： PTN3500
Philips Semiconductors
Product specification
PTN3500
Maintenance and control device
2001 Jan 17
6
Quasi-bidirectional I/Os (see Figure 11)
A quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. At power-on the I/Os are HIGH.
In this mode, only a current source to V
DD
is active. An additional strong pull-up to V
DD
allows fast rising edges into heavily loaded outputs.
These devices turn on when an output is written HIGH, and are switched off by the negative edge of SCL. The I/Os should be HIGH before
being used as inputs.
S
0
1
0
0
A2
A1
A0
0
A
A
A
SDA
SCL
1
2
3
4
5
6
7
8
SW00757
ACKNOWLEDGE
FROM SLAVE
R/W
START CONDITION
ACKNOWLEDGE
FROM SLAVE
SLAVE ADDRESS (PTN3500)
DATA TO PORT
DATA TO PORT
1
P3
0
P3
P
P3
OUTPUT
VOLTAGE
P3
PULL-UP
OUTPUT
CURRENT
I
OHt
I
OH
Figure 11. Transient pull-up current I
OHt
while P3 changes from LOW-to-HIGH and back to LOW
SYMBOL
PARAMETER
MIN
TYP
MAX
UNIT
t
pv
t
ps
t
ph
Output data valid; C
L
≤
100 pF
Input data setup time; C
L
≤
100 pF
Input data hold time; C
L
≤
100 pF
4
μ
s
0
μ
s
4
μ
s
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