參數(shù)資料
型號: ISP1109BS
廠商: NXP SEMICONDUCTORS
元件分類: 通用總線功能
英文描述: Universal Serial Bus transceiver with carkit support
中文描述: LINE TRANSCEIVER, PQCC32
封裝: LEAD FREE, 5 X 5 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT617-1, HVQFN-32
文件頁數(shù): 14/59頁
文件大小: 295K
代理商: ISP1109BS
9397 750 13355
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 14 July 2005
14 of 59
Philips Semiconductors
ISP1109
USB transceiver with carkit support
7.10 Power-On Reset (POR)
When V
CC(I/O)
is directly connected to the RESET_N pin, the internal POR pulse width
(t
PORP
) will be typically 800 ns. The pulse is started when V
CC
rises above V
POR(trip)
(1.5 V to 2.5 V).
To give a better view of the functionality,
Figure 6
shows a possible curve of V
CC
with dips
at t2 to t3 and t4 to t5. If the dip at t4 to t5 is too short (that is, < 11
μ
s), the internal POR
pulse will not react and will remain LOW. The internal POR starts with a 1 at t0. At t1, the
detector will see the passing of the trip level and a delay element will add another t
PORP
before it drops to 0.
The internal POR pulse will be generated whenever V
CC
drops below V
POR(trip)
for more
than 11
μ
s.
(1) PORP = Power-On Reset Pulse.
Fig 6.
Internal power-on reset timing.
004aaa582
V
CC
t0
t1
t2
t3
t4
t5
V
POR(trip)
t
PORP
PORP
(1)
t
PORP
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