ISP1130DL Philips Semiconductors, ISP1130DL Datasheet - Page 10

• Manufacturer Part Number: ISP1130DL
• Description: Universal Serial Bus compound hub with integrated keyboard controller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 06895
Objective specification
6.10 Voltage regulator
6.11 PLL clock multiplier
6.12 Overcurrent detection
6.13 Power-on reset
6.14 I
6.9 Bit clock recovery
The bit clock recovery circuit recovers the clock from the incoming USB data stream
using a 4 oversampling principle. It is able to track jitter and frequency drift as
specified by the USB Specification Rev. 1.1 .
A 5 to 3.3 V DC-DC regulator is integrated on-chip to supply the analog transceiver
and internal logic. This can also be used to supply the terminal 1.5 k pull-up resistor
on the D line of the upstream connection.
A 6 to 48 MHz clock multiplier Phase-Locked Loop (PLL) is integrated on-chip. This
allows for the use of low-cost 6 MHz crystals. The low crystal frequency also
minimizes Electro-Magnetic Interference (EMI). The PLL requires no external
components.
An overcurrent detection circuit for downstream ports has been integrated on-chip. It
is self-reporting, resets automatically, has a low trip time and requires no external
components. The ISP1130 supports individual overcurrent detection.
The ISP1130 has an internal power-on reset circuit, which generates a reset pulse
when the supply voltage is switched on and when the supply voltage drops below a
predetermined threshold value (see
A serial I
to read vendor ID, product ID and other configuration data from an external EEPROM
(e.g., Philips PCF8582 or equivalent). For more information, see
The I
and the Fast mode of operation as described in The I
number 9398 393 40011.
2
C-bus interface
2
C-bus interface timing is programmable and complies with the standard mode
2
C-bus interface (single master or slave, bit rate up to 400 kHz) is provided
Rev. 01 — 23 March 2000
Table
USB compound hub with keyboard controller
89).
2
C-bus and how to use it , order
© Philips Electronics N.V. 2000. All rights reserved.
Section
ISP1130
11.
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