參數(shù)資料
型號: ISP1122D
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: PLASTIC, SO-32
文件頁數(shù): 5/48頁
文件大小: 1159K
代理商: ISP1122D
Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification
Rev. 03 — 29 March 2000
5 of 48
9397 750 07002
Philips Electronics N.V. 2000. All rights reserved.
[1]
[2]
Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
The voltage at pin V
reg(3.3)
is gated by the RESET pin. This allows fully self-powered operation by
connecting RESET to V
BUS
(+5 V USB supply). If V
BUS
is lost upstream port D+ will not be driven.
See
Table 4 “Mode selection”
.
To disable a downstream port connect both D
+
and D
to V
CC
via a 1 M
resistor; unused ports must
be disabled in reverse order starting from port 5.
Analog detection circuit can be switched off using an external EEPROM, see
Table 23
; in this case,
the pin functions as a logic input (TTL level).
Downstream ports 1 and 2 cannot be disabled.
[3]
[4]
[5]
[6]
DP1
DM0
DP0
DM2
DP2
PSW1/GL1
[3]
27
28
29
30
31
32
AI/O
AI/O
AI/O
AI/O
AI/O
O
downstream port 1 D
+
connection (analog)
[6]
upstream port D
connection (analog)
upstream port D
+
connection (analog)
downstream port 2 D
connection (analog)
[6]
downstream port 2 D
+
connection (analog)
[6]
modes 4 to 6
: power switch control output for downstream
port 1 (open-drain, 6 mA)
modes 0 to 3, 7
: GoodLink LED indicator output for
downstream port 1 (open-drain, 6 mA); to connect an LED
use a 330
series resistor
Table 2:
Symbol
[1]
Pin description for SO32 and SDIP32
…continued
Pin
Type
Description
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