參數(shù)資料
型號: ISP1123
廠商: NXP Semiconductors N.V.
英文描述: Universal Serial Bus compound hub
中文描述: 通用串行總線復(fù)合樞紐
文件頁數(shù): 39/49頁
文件大?。?/td> 1155K
代理商: ISP1123
Philips Semiconductors
ISP1123
USB compound hub
Preliminary specification
Rev. 01 — 5 October 1999
39 of 49
9397 750 06325
Philips Electronics N.V. 1999. All rights reserved.
17. 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 23
.
Fig 22. 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 23. 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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