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PDF ISP1520 Data sheet ( Hoja de datos )
| Número de pieza | ISP1520 | |
| Descripción | Hi-Speed Universal Serial Bus hub controller | |
| Fabricantes | NXP Semiconductors | |
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ISP1520
Hi-Speed Universal Serial Bus hub controller
Rev. 02 — 04 May 2004
Product data
1. General description
The ISP1520 is a stand-alone Universal Serial Bus (USB) hub controller IC that
complies with Universal Serial Bus Specification Rev. 2.0. It supports data transfer at
high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s).
The upstream facing port can be connected to a Hi-Speed USB host or hub or to an
Original USB host or hub. If the upstream facing port is connected to a Hi-Speed USB
host or hub, then the ISP1520 will operate as a Hi-Speed USB hub. That is, it will
support high-speed, full-speed and low-speed devices connected to its downstream
facing ports. If the upstream facing port is connected to an Original USB host or hub,
then the ISP1520 will operate as an Original USB hub. That is, high-speed devices
that are connected to its downstream facing ports will operate in full-speed mode
instead.
The ISP1520 is a full hardware USB hub controller. All Original USB devices
connected to the downstream facing ports are handled using a single Transaction
Translator (TT), when operating in a cross-version environment. This allows the
whole 480 Mbit/s upstream bandwidth to be shared by all the Original USB devices
on its downstream facing ports.
The ISP1520 has four downstream facing ports. If not used, ports 3 and 4 can be
disabled. The vendor ID, product ID and string descriptors on the hub are supplied by
the internal ROM; they can also be supplied by an external I2C-bus™ EEPROM or a
microcontroller.
The ISP1520 IC is suitable for self-powered hub designs.
An analog overcurrent detection circuitry is built into the ISP1520, which can also
accept digital overcurrent signals from external circuits; for example, Micrel MOSFET
switch MIC2026. The circuitry can be configured to trip on a global or an individual
overcurrent condition.
Each port comes with two status indicator LEDs.
Target applications of the ISP1520 are monitor hubs, docking stations for notebooks,
internal USB hub for motherboards, hub for extending Intel® Easy PCs, hub boxes,
and so on.
1 page  
Philips Semiconductors
7. Pinning information
7.1 Pinning
ISP1520
Hi-Speed USB hub controller
SUSPEND 1
GND 2
DM0 3
DP0 4
RPU 5
GND 6
RREF 7
TEST_HIGH 8
VCC1 9
GND 10
VCC4 11
TEST_HIGH 12
VCC2 13
GND 14
DM1 15
DP1 16
ISP1520BD
48 DP4
47 DM4
46 GND
45 VCC2
44 DP3
43 DM3
42 GND
41 VCC4
40 GND
39 VCC1
38 TEST_HIGH
37 DP2
36 DM2
35 GND
34 XTAL2
33 XTAL1
004aaa164
Fig 2. Pin configuration.
7.2 Pin description
Table 2: Pin description[1]
Symbol[2]
Pin Type
SUSPEND 1
O
GND
DM0
DP0
RPU
2-
3 AI/O
4 AI/O
5 AI
GND
6-
Description
suspend indicator output; HIGH indicates that the hub is in
the suspend mode
ground supply
upstream facing port D− connection (analog)
upstream facing port D+ connection (analog)
pull-up resistor connection; connect this pin through a
resistor of 1.5 kΩ ± 5 % to 3.3 V
ground supply
9397 750 11689
Product data
Rev. 02 — 04 May 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
5 of 51
5 Page 
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
8.7 Power-on reset
The ISP1520 has an internal Power-On Reset (POR) circuit.
The triggering voltage of the POR circuit is 2.03 V nominal. A POR is automatically
generated when VCC goes below the trigger voltage for a duration longer than 1 µs.
VCC
2.03 V
POR
≤ 683 µs
0V
At t1: clock is running and available.
Fig 3. Power-on reset timing.
t1
004aaa388
POR
EXTERNAL CLOCK
A
Stable external clock is to be available at A.
Fig 4. External clock with respect to power-on reset.
004aaa365
9397 750 11689
Product data
Rev. 02 — 04 May 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
11 of 51
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISP1520.PDF ] | |
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