1PS8961D 12/10/12
Features
• 1:2 Gigabit LAN Switch
• Power-down support
• Low bit-to-bit skew: 200ps
• Very Low Crosstalk: –75dB @ 250MHz
• Status Indicator LEDs Switched with Ethernet pairs
• VDD Operating Range: +3.0V to +3.6V
• Enhanced ESD Protection (on A, B, C, LED pins):
– 8kV (contact)(1)
– 1.0kV (machine model),
11kV (human body model)
• >650 MHz bandwidth
• Packaging:
– 56-contact TQFN (5 x 11mm, 0.5 pitch)
– 42-contact TQFN (3.5 x 9mm, 0.5 pitch)
– 42-contact TQFN (3.5 x 7mm, 0.4 pitch)
Description
The PI3L720 is a 8-Channel 2:1 multiplexer/demultiplexer LAN
Switch with Hi-Z outputs. Industry leading advantages include a
propagation delay of less than 250ps, resulting from its low channel
resistance and I/O capacitance. The device multiplexes differential
outputs from a Gigabit Ethernet transceiver (PHY) device to one
of two corresponding B or C outputs. The switch is bidirectional
and offers little or no attenuation of the high-speed signals at the
outputs. It is designed for low bit-to-bit skew, high channel-to-
channel noise isolation and is compatible with various standards,
such as 10/100/1000 Base-T (Ethernet).
The PI3L720 provides a Power Down input (PD), which can put
the device into standby mode (PD=1) while mobile, eliminating
an external power switch.
Generally, this part can be used to replace mechanical relays in
low-voltage LAN applications that interface a physical layer over
CAT 5 or CAT 6 unshielded twisted pair cable through an isolation
transformer.
Block Diagram
PI3L720
2:1 Mux/DeMux Gigabit Ethernet
LAN Switch with Power-down Mode
SEL
A3-
A3+
A0-
A0+
B0-
B0+
C0-
C0+
B3-
B3+
C3-
C3+
PD POWER
DOWN
LED
A0
LED
A1
LED
A2
LED
B0
LED
C0
LED
B1
LED
C1
LED
B2
LED
C2
Truth Table
PD SEL Function
L L AX to BX; LEDAX to LEDBX
L H AX to CX; LEAX to LEDCX
H x Hi-Z
Note:
1. IEC 6100-4-2
Applications
• Dual Physical Layer Device sharing to one interface
connector, or one controller to dual connectors for docking
• Routes signals for 10/100/1000 Mbit Ethernet
13-0008
2PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Pin Description
Pin Name Description
AX+, AX- Port A DeMux I/O
BX+, BX- Port B Mux I/O
CX+, CX- Port C LED Mux I/O
GND Ground
LEDZX LED I/O
PD Power Down. Active high, with
internal pull-down resistor
SEL Select
VDD Power
Pin Conguration (42-TQFN ZH, Top-Side View)
V
DD
A0+
A0-
V
DD
PD
A1+
A1-
V
DD
A2+
A2-
A3+
A3-
SEL
V
DD
LEDA0
LEDA1
LEDB0
B0+
B0-
C0+
C0-
B1+
B1-
C1+
C1-
V
DD
B2+
B2-
C2+
C2-
B3+
B3-
C3+
C3-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
LEDA2
LEDB2
LEDC2
V
DD
LEDB1
LEDC0
LEDC1
VDD
18
19
20
21
42
41
40
39
GND
Pin Conguration (56-TQFN Top-Side View)
GND
A0+
A0-
V
DD
PD
GND
A1+
A1-
GND
V
DD
A2+
A2-
GND
A3+
A3-
GND
SEL
V
DD
LEDA0
LEDA1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
V
DD
GND
LEDA2
GND
LEDB2
LEDC2
V
DD
GND
GND
LEDB0
LEDB1
GND
LEDC0
LEDC1
V
DD
GND
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
B0+
B0-
C0+
C0-
GND
B1+
B1-
C1+
C1-
GND
V
DD
B2+
B2-
C2+
C2-
GND
B3+
B3-
C3+
C3-
GND
Pin Conguration (42-TQFN ZL, Top-Side View)
V
DD
A0+
A0-
V
DD
PD
A1+
A1-
V
DD
A2+
A2-
A3+
A3-
SEL
V
DD
LEDA0
LEDA1
B0-
C0+
C0-
B1+
B1-
C1+
C1-
V
DD
B2+
B2-
C2+
C2-
B3+
B3-
C3+
C3-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
LEDA2
LEDB2
LEDC2
V
DD
LEDB1
LEDC0
LEDC1
VDD
18
19
20
21
42
41
40
39
GND
17
LEDB0
38 B0+
13-0008
3PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
DC Electrical Characteristics for 1000 Base-T Ethernet Switching over Operating Range
(TA = –40°C to +85°C, VDD = 3.3V ±10%)
Paramenter Description Test Conditions(1) Min. Typ.(2) Max. Units
VIH Input HIGH Voltage Guaranteed HIGH level (Control Pins) 2.0 – –
VVIL Input LOW Voltage Guaranteed LOW level (Control Pins) –0.5 – 0.8
VIK Clamp Diode Voltage VDD = Max., IIN = –18mA – –0.7 –1.2
IIH Input HIGH Current VDD = Max., VIN = VDD – – ±2 µA
IIL Input LOW Current VDD = Max., VIN = GND – – ±2
RON Switch On-Resistance(3) VDD = Min., 1.5V ≤ VIN ≤ VDD
IIN = –40mA – 4.0 6.5
OhmRFLAT(ON) On-Resistance Flatness(3) VDD = Min., VIN @ 1.5V and VDD
IIN = –40mA – 0.5 –
ΔRON On-Resistance match from center
ports to any other port(3)
VDD = Min., 1.5V ≤ VIN ≤ VDD
IIN = –40mA – 0.4 1.0
DC Electrical Characteristics for 10/100 Base-T Ethernet Switching over Operating Range
(TA = –40°C to +85°C, VDD = 3.3V ±10%)
Paramenter Description Test Conditions(1) Min. Typ.(2) Max. Units
VIH Input HIGH Voltage Guaranteed HIGH level (Control Pins) 2.0 – –
VVIL Input LOW Voltage Guaranteed LOW level (Control Pins) –0.5 – 0.8
VIK Clamp Diode Voltage VDD = Max., IIN = –18mA – –0.7 –1.2
IIH Input HIGH Current VDD = Max., VIN = VDD – – ±2 µA
IIL Input LOW Current VDD = Max., VIN = GND – – ±2
RON Switch On-Resistance(3) VDD = Min., 1.25V ≤ VIN ≤ VDD IIN =
–10mA to –30mA – 4.0 6.5
OhmRFLAT(ON) On-Resistance Flatness(3) VDD = Min., VIN @ 1.25V and VDD
IIN = –10mA to –30mA – 0.5 –
∆RON On-Resistance match from cen-
ter ports to any other port(3)
VDD = Min., 1.25V ≤ VIN ≤ VDD IIN =
–10mA to –30mA – 0.4 1.0
Storage Temperature ........................................................ –65°C to +150°C
Supply Voltage to Ground Potential ........................... –0.5V to +4.0V
DC Input Voltage ................................................................–0.5V to +5.5V
DC Output Current .......................................................................... 120mA
Power Dissipation .............................................................................. 0.5W
Note:
Stresses greater than those listed under MAXIMUM RAT-
INGS may cause permanent damage to the device. This is
a stress rating only and functional operation of the device
at these or any other conditions above those indicated in
the operational sections of this specication is not implied.
Exposure to absolute maximum rating conditions for ex-
tended periods may affect reliability.
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
13-0008
4PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Power Supply Characteristics
Parameters Description Test Conditions(1) Min. Typ.(2) Max. Units
IDD-Standby(3) Quiescent Power Supply Current VDD = Max., VIN = GND or VDD —0.3 0.5 mA
IDD-Active(3) Active Power Supply Current VDD = Max., VIN = VDD or GND 1.0 1.5 mA
IDD-PD(3) Power Down Current PD = 1, VDD = MAX, VIN = VDD or GND 0.15 0.25 mA
Notes:
1. For max. or min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VDD = 3.3V, TA = 25°C ambient and maximum loading.
3. Measured by the voltage drop between A and B pins at indicated current through the switch. ON resistance is determined by the lower of the
voltages on the two (A & B) pins.
4. This parameter is determined by device characterization but is not production tested.
Capacitance(TA = –40°C to +85°C, VDD = 3.3V ±10%)
Parameters(4) Description Test Conditions(1) Min. Typ. Max. Units
CIN Input Capacitance
VIN = 0V, f = 1MHz
2.0 3.0
pFCOFF(B1, B2) Port B Capacitance, Switch OFF 3.0 6.0
CON(A/B) A/B Capacitance, Switch ON 8.0 11.0
Notes:
1. For max. or min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VDD = 3.3V, TA = 25°C ambient and maximum loading..
3. Active power represents normal data communication. Standby power is when the device is enabled for operation but there is no LAN trafc
(cable not connected). Power down current is the minimum power state used when not connected and mobile.
4. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance. The
time constant for the switch alone is of the order of 0.25ns for 10pF load. Since this time constant is much smaller than the rise/fall times of
typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side.
Dynamic Electrical Characteristics Over the Operating Range (TA = –40°C to +85°C, VDD = 3.3V ±10%)
Parameter Description Test Conditions(1) Min. Typ.(2) Max. Units
XTALK Crosstalk(3)
RL = 100-Ohm, f = 250MHz
—–75 —
dB
OIRR OFF Isolation(3) —–35 —
BW Bandwidth –3dB(3) RL = 100-Ohm —650 —MHz
Notes:
1. For max. or min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VDD = 3.3V, TA = 25°C ambient and maximum loading..
3. Guaranteed by design.
4. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance. The
time constant for the switch alone is of the order of 0.25ns for 10pF load. Since this time constant is much smaller than the rise/fall times of
typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side.
13-0008
5PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Notes:
1. For max. or min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VDD = 3.3V, TA = 25°C ambient and maximum loading..
3. Guaranteed by design.
4. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance. The
time constant for the switch alone is of the order of 0.25ns for 10pF load. Since this time constant is much smaller than the rise/fall times of
typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side.
Switching Characteristics (TA = -40°C to +85°C, VDD = 3.3V ± 10%)
Paramenter Description Min. Typ.(2) Max. Units
tPD Propagation Delay(3,4) – 0.25
ns
tPZH, tPZL Line Enable Time - SEL to AN, BN0.5 – 15.0
tPHZ, tPLZ Line Disable Time - SEL to AN, BN0.5 – 5.0
tSK(o) Output Skew between center port to any other port(3) – 0.1 0.2
tSK(p) Skew between opposite transitions of the same output (tPHL - tPLH) (3) – 0.1 0.2
tON/OFF Device enable / disable time from PD 100 200
13-0008
6PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Test Circuit for Electrical Characteristics
Notes:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator
Test Circuit for Dynamic Electrical Characteristics
VDD D.U.T
T1R1
S1
HP11667A 50-Ohm10pF
HP8753ES
Switch Positions
Test Switch
tPLZ, tPZL (output on B-side) 6.0V
tPHZ, tPZH (output on B-side) GND
Prop Delay Open
RT
10pF
CL
VDD
VIN VOUT
200-ohm
200-ohm
6.0V
Pulse
Generator D.U.T
13-0008
7PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Voltage Waveforms Propagation Delay Times
Switching Waveforms
Output Skew - tSK(o) Pulse Skew - tSK(p)
Voltage Waveforms Enable and Disable Times
Data In
Data Out
at Channel X
Data Out
at Channel Y
tPLHX tPHLX
3.5V
2.5V
2.5V
2.5V
I
tSK(o) = I tPLHy – tPLHx I or I tPHLy – tPHLx I
tSK(o)
tPLHy tPHLy
VOH
VOL
VOL
VOH
1.5V
Input
Output
tPLH
tSK(p) = I tPHL – tPLH I
tPHL
3.5V
2.5V
2.5V
VOL
VOH
1.5V
tPLZ
1.25V 1.25V
2.5V
VOH
0V
VOL
VDD/2
VDD/2
tPHZ
tPZL
tPZH
Output
Output
VOL +0.3V
VOH –0.3V
VOL
VOH
SEL
Applications Information
Logic Inputs
The logic control inputs can be driven up to +3.6V regardless of the supply voltage. For example, given a +3.3V supply, the output
enables or select pins may be driven low to 0V and high to 3.6V. Driving IN Rail-to-Rail® minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is advised for all CMOS devices. It is recommended to always apply VDD before applying signals to
the input/output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd
Input
t
PLH
2.5V 2.5V
2.5V 2.5V
t
PHL
3.5V
1.5V
Output
V
OH
V
OL
Notes:
Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
All input impulses are supplied by generators having the following characteristics: PRR ≤ MHz, ZO = 50-Ohm, tR ≤ 2.5ns, tF ≤ 2.5ns.
13-0008
8PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Packaging Mechanical: 56-Contact TQFN (ZF)
1
DESCRIPTION: 56-contact, Thin Fine Pitch Quad Flat No-lead (TQFN)
PACKAGE CODE: ZF56
DOCUMENT CONTROL #: PD-2024 REVISION: C
DATE: 05/15/08
08-0208
13-0008
9PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Packaging Mechanical: 42-Contact TQFN (ZH)
DATE: 11/14/12
DESCRIPTION: 42-contact Thin Fine Pitch Quad Flat No-Lead (TQFN)
PACKAGE CODE: ZH42
DOCUMENT CONTROL #: PD-2035 REVISION:D
Notes:
1. All dimensions are in millimeters. Angles in degrees.
2. Coplanarity applies to the exposed pad as well as the terminals.
3. Refer JEDEC MO-220.
4. Recommended land pattern is for reference only.
5. Thermal pad soldering area
12-0529
13-0008
10 PS8961D 12/10/12
PI3L720
2:1 Mux/DeMux Gigabit Ethenet
LAN Switch with Power-down Mode
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
2. Add 'X' for Tape and Reel
Ordering Information
Ordering Number Package Code Package Description
PI3L720ZFE ZF Pb-free & Green, 56-contact TQFN
PI3L720ZHE ZH Pb-free & Green, 42-contact TQFN (0.5mm pitch)
PI3L720ZLE ZL Pb-free & Green, 42-contact TQFN (0.4mm pitch)
Packaging Mechanical: 42-Contact TQFN (ZL)
: 42-Lead, Thin Fine Pitch Quad Flat No-Lead (TQFN)NOITPIRCSED
:EDOC EGAKCAP
2082-DP :# LORTNOC TNEMUCOD
ZL42
DATE: 01/29/09
REVISION: A
09-0071
13-0008
