1
PS8153B 12/10/99
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PI3C3125
PI3C3126
2.5V/3.3V, High Bandwidth, Hot Insertion,4-Bit,
2-Port Bus Switch with Individual Enables
Product Description
Pericom Semiconductors PI3C series of logic circuits are produced
using the Companys advanced sub micron CMOS technology,
achieving industry leading speed grades.
The PI3C3125A and PI3C3126A are 2.5V or 3.3 Volt, 4-bit bus
switches designed with four individual 5
bus switches with fast
indiviual enables in an industry standard 74XX125/126 pinout.
When enabled via the associated Bus Enable (BE) 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 PI3C3125 device has active LOW enables, and the PI3C3126A
has active HIGH enables. It is very useful in switching signals that
have high bandwidth (>400 MHz).
Product Features
Near zero propagation delay
5
switches connect inputs to outputs
High Bandwidth (>400 MHz)
Rail-to-Rail, or 2.5V or 3.3V Switching
5V I/O Tolerant
2.5V Supply Voltage Operation
Permits Hot Insertion
Packages 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)
Applications
High Bandwidth Data Switching
Hot Docking
PI3C3125 Logic Block Diagram
PI3C3126 Logic Block Diagram
BE0
A0
B0
BE1
A1
B1
BE2
A2
B2
BE3
A3
B3
BE0
A0
B0
BE1
A1
B1
BE2
A2
B2
BE3
A3
B3
2
PS8153B 12/10/99
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PI3C3125/PI3C3126
2.5V/3.3V, High Bandwidth,
Hot Insertion, 4-Bit, 2-Port Bus Switch
PI3C3125 14-Pin Configuration
PI3C3126 14-Pin Configuration
PI3C3125 16-Pin Configuration
PI3C3126 16-Pin Configuration
Pin Description
Pin Name
Description
BEn
Switch Enable (PI3C3125)
BEn
Switch Enable (PI3C3126)
A3-A0
Bus A
B3-B0
Bus B
V
CC
Power
GND
Ground
PI3C3125 PI3C3126
BEn
BEn
An
Bn
V
CC
Function
X*
X
Hi-Z
Hi-Z GND
Disconnect
H
L
Hi-Z
Hi-Z
V
CC
Disconnect
L
H
Bn
An
V
CC
Connect
Truth Table
(1)
Note:
1. H = High Voltage Level, L = Low Voltage Level
HI-Z = High Impedance, X = Dont Care
* A pull-up resistor should be provided for power-up protection.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional opera-
tion 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.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Vcc
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
14-PIN
W14
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Vcc
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
14-PIN
W14
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
16-PIN
Q16
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
16-PIN
Q16
Storage Temperature............................................................65C to +150C
Ambient Temperature with Power Applied ............................. 40C to +85C
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
14-Pin
L,W
14-Pin
L,W
16-Pin
Q
16-Pin
Q
3
PS8153B 12/10/99
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PI3C3125/PI3C3126
2.5V/3.3V, High Bandwidth,
Hot Insertion, 4-Bit, 2-Port Bus Switch
DC Electrical Characteristics
(Over Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
Parameters Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
0.8
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
1
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
1
A
I
OZH
High Impedance Output Current 0
A, B
V
CC
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.73
1.2
V
R
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V,
I
ON
= 48mA or 60mA
5
7
V
CC
= Min., V
IN
= 2.4V,
I
ON
= 15mA
8
15
Parameters
(5)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.5
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
5.0
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
10.0
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
= 25C 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.
5. This parameter is determined by device characterization but is not production tested.
V
Capacitance
(T
A
= 25C, f = 1 MHz)
Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
260
500
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.0V
(3)
750
Input HIGH
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 3.3V, +25C ambient.
3. Per driven input (control input only); A and B pins do not contribute to
I
CC
.
A
4
PS8153B 12/10/99
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PI3C3125/PI3C3126
2.5V/3.3V, High Bandwidth,
Hot Insertion, 4-Bit, 2-Port Bus Switch
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. 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.
PI3C3125/PI3C3126
Com.
Parameters Description
Conditions
(1)
Min.
Max. Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50 pF,
0.25
t
PHL
A to B, B to A
R
L
= 500
t
PZH
Bus Enable Time
1.5
9.8
ns
t
PZL
C
L
= 50 pF,
t
PHZ
Bus Disable Time
R
L
= 500
,
1.5
8.3
t
PLZ
R = 500
PI3C3125/PI3C3126
Com.
Parameters Description
Conditions
(1)
Min.
Max. Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50 pF,
0.25
t
PHL
A to B, B to A
R
L
= 500
t
PZH
Bus Enable Time
1.5
6.5
ns
t
PZL
C
L
= 50 pF,
t
PHZ
Bus Disable Time
R
L
= 500
,
1.5
5.5
t
PLZ
R = 500
PI3C3125/PI3C3126 Switching Characteristics over 2.5V Operating Range
PI3C3125/PI3C3126 Switching Characteristics over 3.3V Operating Range
5
PS8153B 12/10/99
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PI3C3125/PI3C3126
2.5V/3.3V, High Bandwidth,
Hot Insertion, 4-Bit, 2-Port Bus Switch
4.0
2.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
V
OUT
, (V)
VIN, (V)
VCC =
3.3V
3.1V
2.9V
2.7V
2.5V
2.3V
3.6V
3.8V
3.4V
3.2V
3.0V
2.8V
Output Voltage vs. Input Voltage over Various Supply Voltages
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5
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C
0
4
Ordering Information
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
Output Voltage vs. Input Voltage over Various Supply Voltages
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