参数资料
型号: ISP1520BD,557
厂商: NXP SEMICONDUCTORS
元件分类: 总线控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封装: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件页数: 36/54页
文件大小: 288K
代理商: ISP1520BD,557
ISP1520_4
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 28 April 2006
40 of 53
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
[1]
fSCL = 164 × fXTAL.
[2]
Rise time is determined by Cb and pull-up resistor value Rp (typical 4.7 k).
[3]
Setup time for (repeated) START condition.
[4]
Hold time for (repeated) START condition.
[5]
SCL LOW to data-out valid time.
Table 46.
Dynamic characteristics: I2C-bus (pins SDA and SCL)
VCC and Tamb within recommended operating range; VDD =5V; VSS =VGND ; VIL and VIH between VSS and VDD.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Clock frequency
fSCL
SCL clock frequency
fXTAL =12MHz
93.75
100
kHz
General timing
t(SCL)L
LOW period of the SCL clock
4.7
-
s
t(SCL)H
HIGH period of the SCL clock
4.0
-
s
tr
rise time
SDA and SCL signals
-
1000
ns
tf
fall time
SDA and SCL signals
-
300
ns
Cb
capacitive load for each bus line
-
400
pF
SDA timing
tBUF
bus free time between a STOP and
START condition
4.7
-
s
tSU;STA
setup time for the START condition
[3] 4.7
-
s
tHD;STA
hold time for the START condition
[4] 4.0
-
s
tSU;DAT
data setup time
250
-
ns
tHD;DAT
data hold time
0
-
s
tSU;STO
STOP condition setup time
4.0
-
s
Additional I2C-bus timing
tVD;DAT
data valid time
-
0.4
s
Fig 16. I2C-bus timing
P
S
Sr
P
004aaa814
tHD;STA
tBUF
tSU;STA
tSU;DAT
tf
t(SCL)H t(SCL)L
tSU;STO
tr
tHD;DAT
SDA
SCL
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