SE98A_4
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 25 November 2009
33 of 43
NXP Semiconductors
SE98A
DDR memory module temp sensor, 1.7 V to 3.6 V
[1] Minimum clock frequency is 0 kHz if SMBus Time-out is disabled.
[2] Delay from SDA STOP to SDA START.
[3] A device must internally provide a hold time of at least 200 ns for SDA signal (referenced to the V
IH(min)
of the SCL signal) to bridge the
undefined region of the falling edge of SCL.
[4] Delay from SCL HIGH-to-LOW transition to SDA edges.
[5] Delay from SCL LOW-to-HIGH transition to restart SDA.
[6] Delay from SDA START to first SCL HIGH-to-LOW transition.
Table 27. SMBus AC characteristics
V
DD
= 1.7 V to 3.6 V; T
amb
= 40 ?/SPAN>C to +125 ?/SPAN>C; unless otherwise specified. These specifications are guaranteed by design.
The AC specifications fully meet or exceed SMBus 2.0 specifications, but allow the bus to interface with the I
2
C-bus from DC
to 400 kHz.
Symbol
Parameter
Conditions
Standard mode
Fast mode
Unit
Min
Max
Min
Max
f
SCL
SCL clock frequency
10
[1]
100
10
[1]
400 kHz
t
HIGH
HIGH period of the SCL clock 70 % to 70 %
4000
-
600
-
ns
t
LOW
LOW period of the SCL clock 30 % to 30 %
4700
-
1300
-
ns
t
to(SMBus)
SMBus time-out time
LOW period to reset
SMBus
25
35
25
35
ms
t
r
rise time of both SDA and
SCL signals
-
1000
20
300 ns
t
f
fall time of both SDA and SCL
signals
-
300
-
300 ns
t
SU;DAT
data set-up time
250
-
100
-
ns
t
h(i)(D)
data input hold time
[2]
[3]
0
-
0
-
ns
t
HD;DAT
data hold time
[4]
200
3450
200
900 ns
t
SU;STA
set-up time for a repeated
START condition
[5]
4700
-
600
-
ns
t
HD;STA
hold time (repeated) START
condition
30 % of SDA to
70 % of SCL
[6]
4000
-
600
-
ns
t
SU;STO
set-up time for STOP
condition
4000
-
600
-
ns
t
BUF
bus free time between a
STOP and START condition
[2]
4700
-
1300
-
ns
t
SP
pulse width of spikes that
must be suppressed by the
input filter
-
50
-
50
ns
t
VD;DAT
data valid time
from clock
200
-
200
-
ns
t
f(o)
output fall time
-
-
-
250 ns
t
POR
power-on reset pulse time
power supply falling
0.5
-
0.5
-
約
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