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參數資料
型號: ISP1122AD
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: Universal Serial Bus stand-alone hub
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PDSO32
封裝: 7.50 MM, PLASTIC, SO-48
文件頁數: 38/48頁
文件大小: 1150K
代理商: ISP1122AD
Philips Semiconductors
ISP1122A
USB stand-alone hub
Preliminary specification
Rev. 01 — 27 March 2000
38 of 48
9397 750 06986
Philips Electronics N.V. 2000. All rights reserved.
16. Test information
The dynamic characteristics of the analog I/O ports (D
+
and D
)
as listed in
Table 32
and
Table 33
, were determined using the circuit shown in
Figure 22
.
Fig 21. I
2
C-bus timing.
handbook, full pagewidth
P
S
S
P
MGR779
tHD;STA
tBUF
tHD;STA
tSU;STA
tSU;DAT
tf
tHIGH
tSU;STO
tr
tHD;STA
tLOW
SDA
SCL
Load capacitance:
C
L
= 50 pF (full-speed mode)
C
L
= 200 pF or 600 pF (low-speed mode, minimum or maximum timing).
Speed selection:
full-speed mode (FS): 1.5 k
pull-up resistor on D
+
low-speed mode (LS): 1.5 k
pull-up resistor on D
.
Fig 22. Load impedance for D+ and D- pins.
MGR775
handbook, halfpage
S1
S1
test point
test
D
/LS
D
+
/LS
D
/FS
D
+
/FS
closed
closed
open
open
CL
Vreg(3.3)
RPU
1.5 k
15 k
20
D.U.T.
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