Philips Universal Serial Bus ISP1122 Specification Sheet page 5

Philips Semiconductors
9397 750 07002
Product specification
Table 2: Pin description for SO32 and SDIP32
[1]
Symbol Pin Type
DP1 27 AI/O
DM0 28 AI/O
DP0 29 AI/O
DM2 30 AI/O
DP2 31 AI/O
[3]
PSW1/GL1 32 O
[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
[2] The voltage at pin V
reg(3.3)
connecting RESET to V
BUS
[3] See Table 4 "Mode selection".
[4] To disable a downstream port connect both D and D to V
be disabled in reverse order starting from port 5.
[5] Analog detection circuit can be switched off using an external EEPROM, see
the pin functions as a logic input (TTL level).
[6] Downstream ports 1 and 2 cannot be disabled.
Rev. 03 — 29 March 2000
...continued
Description
downstream port 1 D connection (analog)
upstream port D connection (analog)
upstream port D connection (analog)
downstream port 2 D connection (analog)
downstream port 2 D connection (analog)
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
is gated by the RESET pin. This allows fully self-powered operation by
(+5 V USB supply). If V is lost upstream port D+ will not be driven.
BUS
ISP1122
USB stand-alone hub
[6]
[6]
[6]
via a 1 M resistor; unused ports must
CC
Table 23; in this case,
© Philips Electronics N.V. 2000. All rights reserved.
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