ISP1123
Universal Serial Bus compound hub
Rev. 02 — 8 August 2000
Product specification
1. General description
The ISP1123 is a compound Universal Serial Bus (USB) hub device which complies
with
USB Specification Rev. 1.1.
It integrates a Serial Interface Engine (SIE), hub
repeater, hub controller, USB data transceivers and a 3.3 V voltage regulator. It has a
configurable number of downstream ports, ranging from 2 to 5, with one port
dedicated to an embedded or non-removable function.
The ISP1123 can be bus-powered, self-powered or hybrid-powered. When it is
hybrid-powered the hub functions are powered by the upstream power supply (V
BUS
),
but the downstream ports are powered by an external 5 Volt supply. The low power
consumption in ‘suspend’ mode allows easy design of equipment that is compliant
with the ACPI™, OnNow™ and USB power management requirements.
The ISP1123 has built-in overcurrent sense inputs, supporting individual and ganged
mode overcurrent protection for downstream ports. All ports (including the hub) have
GoodLink™ indicator outputs for easy visual monitoring of USB traffic. The ISP1123
has a serial I
2
C-bus interface for external EEPROM access and a reduced frequency
(6 MHz) crystal oscillator. These features allow significant cost savings in system
design and easy implementation of advanced USB functionality into PC peripherals.
2. Features
c
c
s
High performance USB hub device with integrated hub repeater, hub controller,
Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator
s
Complies with
Universal Serial Bus Specification Rev. 1.1
and ACPI, OnNow and
USB power management requirements
s
Downstream port 1 dedicated to a non-removable function, correctly reported in
the related descriptors
s
Configurable from 2 to 5 downstream ports with automatic speed detection
s
Internal power-on reset and low voltage reset circuit
s
Supports bus-powered, hybrid-powered and self-powered application
s
Individual or global power switching for downstream ports
s
Individual or ganged port overcurrent protection with built-in sense circuits
s
6 MHz crystal oscillator with on-chip PLL for low EMI
s
Visual USB traffic monitoring (GoodLink™) for hub and downstream ports
s
I
2
C-bus interface to read vendor ID, product ID and configuration bits from
external EEPROM
Philips Semiconductors
ISP1123
USB compound hub
s
s
s
s
s
kOperation over the extended USB bus voltage range (4.0 to 5.5 V)
Operating temperature range
−40
to
+85 °C
8 kV in-circuit ESD protection for lower cost of external components
Full-scan design with high test coverage
Available in 32-pin SDIP, SO and LQFP packages.
3. Ordering information
Table 1:
Ordering information
Package
Name
ISP1123D
ISP1123NB
ISP1123BD
SO32
SDIP32
LQFP32
Description
plastic small outline package; 32 leads; body width 7.5 mm
plastic shrink dual in-line package; 32 leads (400 mil)
plastic low profile quad flat package; 32 leads; body 7 x 7 x 1.4 mm
Version
SOT287-1
SOT232-1
SOT358-1
Type number
4. Block diagram
upstream
port
VCC
5V
SUPPLY
REGULATOR
3.3 V
full
speed
ANALOG
Tx/Rx
HUB
GoodLink
Vreg(3.3)
D+
D−
LED
PLL
BIT CLOCK
RECOVERY
PHILIPS
SIE
INDV
HUB
CONTROLLER OPTION
PACKET
GENERATOR
I
2
C-BUS
INTERFACE
SDA
SCL
6 MHz
ISP1123
HUB
REPEATER
END OF
FRAME
TIMERS
GENERAL
PORT
CONTROLLER
ANALOG
Tx /Rx
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx / Rx
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx /Rx
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx/Rx
GoodLink/
POWER SWITCH/
OC DETECT
ANALOG
Tx/ Rx
GoodLink/
POWER SWITCH/
OC DETECT
self/bus
powered
D+
LED/
D− overcurrent
D+
detection power switch
LED/
D− overcurrent
D+
detection power switch
downstream port 2
(removable)
LED/
D− overcurrent
D+
detection power switch
downstream port 3
(removable)
LED/
D− overcurrent
D+
detection power switch
downstream port 4
(removable)
LED/
D− overcurrent
detection power switch
downstream port 5
(removable)
downstream port 1:
embedded or non-removable
function
MBL083
This is a conceptual block diagram and does not include each individual signal.
Fig 1. Block diagram.
9397 750 07387
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 8 August 2000
2 of 49
Philips Semiconductors
ISP1123
USB compound hub
5. Functional diagram
host
port 0
USB DEVICE
(e.g. keyboard)
(1)
port 1
ISP1123
ports 2 to 5
compound hub box
MBL082
removable external devices
(1) Downstream port 1 is non-removable.
Fig 2. A compound hub box using ISP1123.
6. Pinning information
6.1 ISP1123D (SO32) and ISP1123NB (SDIP32)
6.1.1 Pinning
Vreg(3.3) 1
PSW2/GL2 2
GND 3
DM3 4
DP3 5
VCC 6
OC1 7
OC2 8
32 PSW1/GL1
31 DP2
30 DM2
29 DP0
28 DM0
27 DP1
26 DM1
25 DP5
Vreg(3.3) 1
PSW2/GL2 2
GND 3
DM3 4
DP3 5
VCC 6
OC1 7
OC2 8
32 PSW1/GL1
31 DP2
30 DM2
29 DP0
28 DM0
27 DP1
26 DM1
25 DP5
ISP1123D
OC3 9
OC4 10
OC5/GOC 11
DM4 12
DP4 13
SP/BP 14
HUBGL 15
PSW3/GL3 16
MBL076
ISP1123NB
24 DM5
23 INDV/SDA
22 OPTION/SCL
21 RESET
20 XTAL2
19 XTAL1
18 PSW5/GL5/GPSW
17 PSW4/GL4
OC3 9
OC4 10
OC5/GOC 11
DM4 12
DP4 13
SP/BP 14
HUBGL 15
PSW3/GL3 16
MBL077
24 DM5
23 INDV/SDA
22 OPTION/SCL
21 RESET
20 XTAL2
19 XTAL1
18 PSW5/GL5/GPSW
17 PSW4/GL4
Fig 3. Pin configuration SO32.
Fig 4. Pin configuration SDIP32.
9397 750 07387
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 8 August 2000
3 of 49
Philips Semiconductors
ISP1123
USB compound hub
6.1.2 Pin description
Table 2:
Symbol
[1]
V
reg(3.3)
[2]
PSW2/GL2
[3]
Pin description for SO32 and SDIP32
Pin
1
2
Type
-
O
Description
regulated supply voltage (3.3 V
±
10%) from internal
regulator; used to connect pull-up resistor on DP0 line
modes 4 to 6:
power switch control output for downstream
port 2 (open-drain, 6 mA)
modes 0 to 3, 7:
GoodLink LED indicator output for
downstream port 2 (open-drain, 6 mA); to connect an LED
use a 330
Ω
series resistor
GND
DM3
DP3
V
CC
OC1
OC2
OC3
OC4
OC5/GOC
[3]
3
4
5
6
7
8
9
10
11
-
AI/O
AI/O
-
AI/I
AI/I
AI/I
AI/I
AI/I
ground supply
downstream port 3 D− connection (analog)
[4]
downstream port 3 D+ connection (analog)
[4]
supply voltage; connect to USB supply V
BUS
(bus-powered or
hybrid-powered) or to local supply V
DD
(self-powered)
overcurrent sense input for downstream port 1 (analog
[5]
)
overcurrent sense input for downstream port 2 (analog
[5]
)
overcurrent sense input for downstream port 3 (analog
[5]
)
overcurrent sense input for downstream port 4 (analog
[5]
)
modes 5, 7:
overcurrent sense input for downstream port 5
(analog
[5]
)
modes 0, 1, 3:
global overcurrent sense input (analog
[5]
)
DM4
DP4
SP/BP
12
13
14
AI/O
AI/O
I
downstream port 4 D− connection (analog)
[4]
downstream port 4 D+ connection (analog)
[4]
selects power mode:
self-powered:
connect to V
DD
(local power supply); also use
this mode for hybrid-powered operation
bus-powered:
connect to GND; disable downstream port 5 to
meet supply current requirements
[4]
HUBGL
15
O
hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330
Ω
series resistor; if unused
connect to V
CC
via a 10 kΩ resistor
modes 4 to 6:
power switch control output for downstream
port 3 (open-drain, 6 mA)
modes 0 to 3, 7:
GoodLink LED indicator output for
downstream port 3 (open-drain, 6 mA); to connect an LED
use a 330
Ω
series resistor
PSW4/GL4
[3]
17
O
modes 4 to 6:
power switch control output for downstream
port 4 (open-drain, 6 mA)
modes 0 to 3, 7:
GoodLink LED indicator output for
downstream port 4 (open-drain, 6 mA); to connect an LED
use a 330
Ω
series resistor
PSW3/GL3
[3]
16
O
9397 750 07387
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 8 August 2000
4 of 49
Philips Semiconductors
ISP1123
USB compound hub
Pin description for SO32 and SDIP32
…continued
Pin
18
Type
O
Description
mode 5:
power switch control output for downstream port 5
(open-drain, 6 mA)
modes 3, 7:
GoodLink LED indicator output for downstream
port 5 (open-drain, 6 mA); to connect an LED use a 330
Ω
series resistor
modes 0 to 2:
gang mode power switch control output
(open-drain, 6 mA)
Table 2:
Symbol
[1]
PSW5/GL5/
GPSW
[3]
XTAL1
XTAL2
RESET
[2]
19
20
21
I
O
I
crystal oscillator input (6 MHz)
crystal oscillator output (6 MHz)
reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to V
CC
for power-on reset
(internal POR circuit)
mode selection input; also functions as I
2
C-bus clock output
(open-drain, 6 mA)
selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I
2
C-bus data line (open-drain, 6 mA)
downstream port 5 D− connection (analog)
[4]
downstream port 5 D+ connection (analog)
[4]
downstream port 1 D− connection (analog)
[6]
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
Ω
series resistor
OPTION/SCL
INDV/SDA
22
23
I/O
I/O
DM5
DP5
DM1
DP1
DM0
DP0
DM2
DP2
PSW1/GL1
[3]
24
25
26
27
28
29
30
31
32
AI/O
AI/O
AI/O
AI/O
AI/O
AI/O
AI/O
AI/O
O
[1]
[2]
[3]
[4]
[5]
[6]
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 MΩ 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.
9397 750 07387
© Philips Electronics N.V. 2000. All rights reserved.
Product specification
Rev. 02 — 8 August 2000
5 of 49
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