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ISP1123
Universal Serial Bus compound hub
Rev. 01 — 5 October 1999
Preliminary 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 (VBUS),
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 I2C-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.
c
2. Featuresc
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 I2C-bus interface to read vendor ID, product ID and configuration bits from
external EEPROM

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Philips Semiconductors
ISP1123
USB compound hub
s Operation over the extended USB bus voltage range (4.0 to 5.5 V)
s Operating temperature range 40 to +85 °C
s 8 kV in-circuit ESD protection for lower cost of external components
s Full-scan design with high test coverage
s Available in 32-pin SDIP, SO and LQFP packages.
3. Ordering information
Table 1: Ordering information
Type number
Package
Name
Description
ISP1123D
SO32
plastic small outline package; 32 leads; body width 7.5 mm
ISP1123NB
SDIP32
plastic shrink dual in-line package; 32 leads (400 mil)
ISP1123BD [1]
LQFP32 plastic low profile quad flat package; 32 leads; body 7 x 7 x 1.4 mm
[1] For the availability of the LQFP32 package please contact your local Philips Semiconductors sales office.
4. Block diagram
Version
SOT287-1
SOT232-1
SOT358-1
ISP1123
VCC Vreg(3.3)
5V
SUPPLY
REGULATOR
3.3 V
upstream
port
D+ D
LED
ANALOG
Tx / Rx
HUB
GoodLink
full
speed
6 MHz
PLL
BIT CLOCK
RECOVERY
PHILIPS
SIE
PACKET
GENERATOR
I2C-BUS
INTERFACE
INDV
HUB
CONTROLLER OPTION
SDA
SCL
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+ Dovercurrent LED/ D+ Dovercurrent LED/ D+ Dovercurrent LED/ D+ Dovercurrent LED/ D+ Dovercurrent LED/
detection power switch
detection power switch
detection power switch
detection power switch
detection power switch
downstream port 1:
embedded or non-removable
function
downstream port 2
(removable)
downstream port 3
(removable)
downstream port 4
(removable)
downstream port 5
(removable)
MBL083
This is a conceptual block diagram and does not include each individual signal.
Fig 1. Block diagram of the ISP1123.
9397 750 06325
Preliminary specification
Rev. 01 — 5 October 1999
© Philips Electronics N.V. 1999. All rights reserved.
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5. Functional diagram
ISP1123
USB compound hub
handbook, halfpage
host
USB DEVICE
(e.g. keyboard)
(1)
port 1
port 0
ISP1123
ports 2 to 5
compound hub box
(1) Downstream port 1 is non-removable.
Fig 2. A compound hub box using ISP1123.
MBL082
removable external devices
6. Pinning information
6.1 ISP1123D (SO32) and ISP1123NB (SDIP32)
6.1.1 Pinning
handbook, halfpage
Vreg(3.3) 1
PSW2/GL2 2
GND 3
DM3 4
DP3 5
VCC 6
OC1 7
OC2 8
OC3 9
OC4 10
OC5/GOC 11
DM4 12
DP4 13
SP/BP 14
HUBGL 15
PSW3/GL3 16
32 PSW1/GL1
31 DP2
30 DM2
29 DP0
28 DM0
27 DP1
26 DM1
25 DP5
ISP1123D
24 DM5
23 INDV/SDA
22 OPTION/SCL
21 RESET
20 XTAL2
19 XTAL1
18 PSW5/GL5/GPSW
17 PSW4/GL4
MBL076
Fig 3. Pin configuration SO32.
handbook, halfpage
Vreg(3.3) 1
32 PSW1/GL1
PSW2/GL2 2
31 DP2
GND 3
30 DM2
DM3 4
29 DP0
DP3 5
VCC 6
28 DM0
27 DP1
OC1 7
26 DM1
OC2 8
25 DP5
ISP1123NB
OC3 9
24 DM5
OC4 10
23 INDV/SDA
OC5/GOC 11
22 OPTION/SCL
DM4 12
21 RESET
DP4 13
20 XTAL2
SP/BP 14
19 XTAL1
HUBGL 15
18 PSW5/GL5/GPSW
PSW3/GL3 16
17 PSW4/GL4
MBL077
Fig 4. Pin configuration SDIP32.
9397 750 06325
Preliminary specification
Rev. 01 — 5 October 1999
© Philips Electronics N.V. 1999. All rights reserved.
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ISP1123
USB compound hub
6.1.2 Pin description
Table 2: Pin description for SO32 and SDIP32
Symbol [1]
Pin Type Description
Vreg(3.3) [2]
1-
regulated supply voltage (3.3 V ± 10%) from internal
regulator; used to connect pull-up resistor on DP0 line
PSW2/GL2 [3] 2
O 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 series resistor
GND
3-
ground supply
DM3
4 AI/O downstream port 3 Dconnection (analog) [4]
DP3 5 AI/O downstream port 3 D+ connection (analog) [4]
VCC
OC1
6-
supply voltage; connect to USB supply VBUS (bus-powered or
hybrid-powered) or to local supply VDD (self-powered)
7 AI/I overcurrent sense input for downstream port 1 (analog [5])
OC2
8 AI/I overcurrent sense input for downstream port 2 (analog [5])
OC3
9 AI/I overcurrent sense input for downstream port 3 (analog [5])
OC4
10 AI/I overcurrent sense input for downstream port 4 (analog [5])
OC5/GOC [3] 11
AI/I modes 5, 7: overcurrent sense input for downstream port 5
(analog [5])
modes 0, 1, 3: global overcurrent sense input (analog [5])
DM4
12 AI/O downstream port 4 Dconnection (analog) [4]
DP4 13 AI/O downstream port 4 D+ connection (analog) [4]
SP/BP
14 I
selects power mode:
self-powered: connect to VDD (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
PSW3/GL3 [3] 16 O
hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330 series resistor; if unused
connect to VCC via a 10 kresistor
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 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 series resistor
9397 750 06325
Preliminary specification
Rev. 01 — 5 October 1999
© Philips Electronics N.V. 1999. All rights reserved.
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ISP1123
USB compound hub
Table 2: Pin description for SO32 and SDIP32…continued
Symbol [1]
Pin Type Description
PSW5/GL5/
GPSW [3]
18
O
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
series resistor
modes 0 to 2: gang mode power switch control output
(open-drain, 6 mA)
XTAL1
19 I
crystal oscillator input (6 MHz)
XTAL2
20 O
crystal oscillator output (6 MHz)
RESET [2]
21 I
reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to VCC for power-on reset
(internal POR circuit)
OPTION/SCL 22
I/O mode selection input; also functions as I2C-bus clock output
(open-drain, 6 mA)
INDV/SDA
23 I/O selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I2C-bus data line (open-drain, 6 mA)
DM5
24 AI/O downstream port 5 Dconnection (analog) [4]
DP5 25 AI/O downstream port 5 D+ connection (analog) [4]
DM1
26 AI/O downstream port 1 Dconnection (analog) [6]
DP1 27 AI/O downstream port 1 D+ connection (analog) [6]
DM0
28 AI/O upstream port Dconnection (analog)
DP0 29 AI/O upstream port D+ connection (analog)
DM2
30 AI/O downstream port 2 Dconnection (analog) [6]
DP2 31 AI/O downstream port 2 D+ connection (analog) [6]
PSW1/GL1 [3] 32 O
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
[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.
[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by
connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.
[3] See Table 4 “Mode selection”.
[4] To disable a downstream port connect both D+ and Dto VCC via a 1 Mresistor; unused ports must
be disabled in reverse order starting from port 5.
[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).
[6] Downstream ports 1 and 2 cannot be disabled.
9397 750 06325
Preliminary specification
Rev. 01 — 5 October 1999
© Philips Electronics N.V. 1999. All rights reserved.
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