PI3C3126
2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit,
2-Port Bus Switch with Individual Enables
Features
• Near-Zero propagation delay
• 5-ohm switches connect inputs to outputs
• High Bandwidth (>400 MHz)
• 2.5V/3.3V Supply Voltage Operation
• Rail-to-Rail, or 2.5V or 3.3V Switching
• 5V I/O Tolerant
• Permits Hot Insertion
• Packaging (Pb-free & Green available):
– 14-pin 150-mil wide plastic SOIC (W)
– 14-pin 170-mil wide plastic TSSOP (L)
– 16-pin 150-mil wide plastic QSOP (Q)
– 16-contact TDFN (ZJ)
Description
Pericom Semiconductor’s PI3C3126 is a 2.5 volt or 3.3 volt, 4-bit
bus switch designed with four individual 5-ohm bus switches
with fast indiviual enables in an industry standard 74XX125/126
pinout. When enabled via the associated Bus Enable pin, the “A”
pin is directly connected to the “B” pin for that particular gate.
The bus switch introduces no additional propagation delay or
additional ground bounce noise.
The PI3C3126 has active HIGH enables. It is very useful in
switching signals that have high bandwidth (>400 MHz).
Applications
• High Bandwidth Data Switching
• Hot Docking
Block Diagram
A
0
BE
0
A
1
BE
1
A
2
BE
2
A
3
BE
3
B
0
B
1
B
2
B
3
09-0072
1
PS9087
10/29/09
PI3C3126
2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit,
2-Port Bus Switch with Individual Enables
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ............................................................ –65°C to +150°C
Ambient Temperature with Power Applied ........................... –40°C to +85°C
.
Supply Voltage to Ground Potential (Inputs & V
CC
Only) ....–0.5V to +4.6V
Supply Voltage to Ground Potential (Outputs & D/O Only) ..–0.5V to +4.6V
DC Input Voltage ....................................................................–0.5V to +5.5V
DC Output Current .............................................................................. 120mA
.
Power Dissipation ................................................................................... 0.5W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS 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 specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
14-Pin Configuration
16-Pin Configuration
BE0
A0
B0
BE1
A1
B1
GND
1
14
2
13
3
14-PIN 12
4
W14 11
5
L14 10
6
9
7
8
Vcc
BE3
A3
B3
BE2
A2
B2
NC
BE0
A0
B0
BE1
A1
B1
GND
1
16
2
15
3
16-PIN 14
4
Q16 13
5
12
6
11
7
10
8
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
Pin Description
Pin Name
BEn
A3 - A0
B3 - B0
V
CC
GND
Description
Switch Enable
Bus A
Bus B
Power
Ground
Truth Table
(1)
BEn
X
L
H
An
Hi-Z
Hi-Z
Bn
Bn
Hi-Z
Hi-Z
An
V
CC
GND
V
CC
V
CC
Function
Disconnect
Disconnect
Disconnect
Note:
1. H = High Voltage Level, L = Low Voltage Level
HI-Z = High Impedance, X = Don’t Care
* A pull-up resistor should be provided for power-up protection.
09-0072
2
PS9087
10/29/09
PI3C3126
2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit,
2-Port Bus Switch with Individual Enables
DC Electrical Characteristics
(Over Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.3V ±10%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH(3)
V
IK
R
ON
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH current
Input LOW Current
High Impedance Output
Current
Clamp Diode Voltage
Switch ON Resistance
(4)
Test Conditions(1)
Guearanteed Logic HIGH Level
Guaranteed Logic LOW Level –0.5
V
CC
=
Max.,
V
IN
= V
CC
V
CC
=
Max.,
V
IN
= GND
0
≤
A, B
≤
V
CC
V
CC
=
Min., I
IN
= –18mA
V
CC
= Min., V
IN
= 0.0V,
I
ON
=
48mA or 60mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
–0.73
5
8
Min.
2.0
Typ.(2)
0.8
±1
±1
±1
–1.2
7
15
V
Ω
Max
Units
V
µA
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, T
A
= 25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. Measured by the voltage drop between A and B pin at indicated current through the switch. ON resistance is determined by the
lower of the voltages on the two (A,B) pins.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OFF
C
ON
Description
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
Test Conditions
VIN = 0V
VIN = 0V
VIN = 0V
Typ.
3.5
5.0
10.0
Units
pF
Notes:
1. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Parameters
I
CC
∆I
CC
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 3.3V, +25°C ambient.
3. Per driven input (control input only); A and B pins do not contribute to ΔICC.
Description
Quiescent Power
Supply Current
Supply Current per
Input HIGH
Test Conditions
V
CC
= Max
V
CC
= Max
V
IN
= GND or V
CC
V
IN
= 3.0V
(3)
Min.
Typ.
(2)
260
Max.
500
750
µA
Units
09-0072
3
PS9087
10/29/09
PI3C3126
2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit,
2-Port Bus Switch with Individual Enables
Switching Characteristics over 3.3V Operating Range
Com.
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propogation Delay
(1,2)
A to B, B to A
Bus Enable Time
Bus Disable Time
Conditions
C
L
=50pF
R
L
= 500Ω
C
L
=50pF
R
L
= 500Ω
R = 500Ω
1.5
1.5
Min.
Max.
0.25
6.5
5.5
ns
Units
Notes:
1. This parameter is guaranteed but not tested on Propagation Delays.
2. 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 50pF 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 interaction with the load on the driven side.
Switching Characteristics over 2.5V Operating Range
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propogation Delay
(1,2)
A to B, B to A
Bus Enable Time
Bus Disable Time
Conditions
C
L
=50pF
R
L
= 500Ω
C
L
=50pF
R
L
= 500Ω
R = 500Ω
1.5
1.5
Com.
Min.
Max.
0.25
9.8
8.3
ns
Units
Notes:
1. This parameter is guaranteed but not tested on Propagation Delays.
2. 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 50pF 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 interaction with the load on the driven side.
09-0072
4
PS9087
10/29/09
PI3C3126
2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit,
2-Port Bus Switch with Individual Enables
4.0
VCC
V
3.1V
2.9V
2.7V
2.5V
2.3V
3.8V
3.6V
3.4V
3.2V
3.0V
2.8V
2.0
VOUT
0.0
0.0
1.0
2.0
3.0
4.0
5.0
)
V
IN
(V)
Switch Output Voltage vs. Input Voltage over Various Supply Voltages
14
DOCUMENT CONTROL NO.
PD - 1002
REVISION: E
DATE: 03/09/05
.149
.157
3.78
3.99
1
.0099
.0196
.336
.344
8.55
8.75
0.25
x 45˚
0.50
0-8˚
.0075
.0098
0.19
0.25
.0155
.026
0.393
0.660
.053
.068
1.35
1.75
SEATING PLANE
0.41
1.27
.2284
.2440
5.80
6.20
.016
.050
1
REF
.050
BSC
1.27
.013
.020
0.330
0.508
.0040
0.10
.0098
0.25
X.XX
DENOTES DIMENSIONS
X.XX
IN MILLIMETERS
Notes:
1) Controlling dimensions in millimeters.
2) Ref: JEDEC MS-012D/AB
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335 • www.pericom.com
DESCRIPTION: 14-Pin, 150-Mil Wide, SOIC
PACKAGE CODE: W
09-0072
5
PS9087
10/29/09
TI技术论坛
