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PI3B3125
PI3B3126
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
using the Companys advanced sub micron CMOS technology,
achieving industry leading speed grades.
The PI3B3125 and PI3B3126 are 3.3 Volt, 4-bit bus switches designed
with four individual 5Ohm 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 PI3B3125 device has active LOW enables, and the PI3B3126 has
active HIGH enables.
Product Features
Near zero propagation delay
5 Ohm switches connect inputs to outputs
Fast Switching Speed - 4ns max.
Permits Hot Insertion
Ultra Low Quiescent Power (0.1A Typical)
Ideally suited for notebook applications
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)
PI3B3125 Logic Block Diagram
PI3B3126 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
3.3V, Hot Insertion, 4-Bit,
2-Port Bus Switch
with Individual Enables
PI3B3125/PI3B3126
3.3V, Hot Insertion, 4-Bit,
2-Port BusSwitch
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PI3B3125 14-Pin
Product Pin Configuration
PI3B3126 14-Pin
Product Pin Configuration
PI3B3125 16-Pin
Product Pin Configuration
PI3B3126 16-Pin
Product Pin Configuration
Product Pin Description
Pin Name
Description
BEn
Switch Enable (PI3B3125)
BEn
Switch Enable (PI3B3126)
A3-A0
Bus A
B3-B0
Bus B
V
CC
Power
GND
Ground
PI3B3125 PI3B3126
BEn
BEn
An
Bn
Vcc
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)
Notes:
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.
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 +4.6V
DC Output Current .............................................................................. 120mA
Power Dissipation ................................................................................... 0.5W
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
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
W, L
W, L
Q
Q
PI3B3125/PI3B3126
3.3V, Hot Insertion, 4-Bit,
2-Port BusSwitch
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Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.5
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
8
pF
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
0.1
3
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.0V
(3)
750
A
Input HIGH
DC Electrical Characteristics
(Over the 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
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
0.8
V
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
1
A
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
1
A
I
OFF
Off Current
V
CC
= 0, V
OUT
= 3 to 3.6V
10
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
1.2
V
R
ON
Switch On Resistance
(3)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA or 60mA
5
8
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
10
17
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 inputs only); A and B pins do not contribute to I
CC
.
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. 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.
4. This parameter is determined by device characterization but is not production tested.
PI3B3125/PI3B3126
3.3V, Hot Insertion, 4-Bit,
2-Port BusSwitch
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PI3B3125
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
0.25
ns
t
PZH
Bus Enable Time
C
L
= 50pF,
t
PZL
R
L
= 500
,
1.0
3.0
ns
t
PHZ
Bus Disable Time
R = 500
t
PLZ
1.0
4.0
ns
PI3B3125 Switching Characteristics over Operating Range
PI3B3126 Switching Characteristics over Operating Range
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.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
PI3B3125
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
0.25
ns
t
PZH
Bus Enable Time
C
L
= 50pF,
t
PZL
R
L
= 500
,
1.0
2.5
ns
t
PHZ
Bus Disable Time
R = 500
t
PLZ
1.0
4.0
ns
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Ordering Information
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