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: 33/54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
38 of 53
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
TPERIOD is the bit duration corresponding to the USB data rate.
tJR is the jitter reference point.
Fig 12. Receiver differential data jitter
mgr871
TPERIOD
tJR
differential
data lines
+3.3 V
0 V
tJR1
tJR2
consecutive
transitions
N
× TPERIOD + tJR1
paired
transitions
N
× TPERIOD + tJR2
Fig 13. Receiver SE0 width tolerance
mgr872
differential
data lines
+3.3 V
0 V
tFST
VIH(min)
Full-speed timing symbols have a subscript prex ‘F’, low-speed timing a prex ‘L’.
Fig 14. Hub differential data delay and SOP distortion
mgr777
SOP distortion:
tSOP = tHDD (next J) tHDD(SOP)
(A) downstream hub delay
(B) upstream hub delay
upstream
differential
data lines
hub delay
downstream
tHDD
hub delay
upstream
tHDD
downstream
differential
data lines
downstream
differential
data
upstream
differential
data
crossover
point
crossover
point
crossover
point
crossover
point
+3.3 V
0 V
+3.3 V
0 V
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