1
PS8153F 09/09/04
PI3B3125
PI3B3126
Description
Pericom Semiconductor's PI3B3125 and PI3B3126 are 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 PI3B3125 device has active LOW enables, and the PI3B3126
has active HIGH enables.
Features
Near-Zero propagation delay
5 switches connect inputs to outputs
Fast Switching Speed -4ns Max.
Ultra Low Quiescent Power (0.1A Typical)
Ideally suited for notebook applications
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)
PI3B3125 Block Diagram
PI3B3126 Block Diagram
3.3V, 4-Bit, 2-Port Nanoswitch
TM
w/Individual Enables
A0
A1
A2
BE0
BE1
A3
BE2
BE3
B0
B1
B2
B3
SW
SW
SW
SW
A
B
BE
SW
A0
A1
A2
BE0
BE1
A3
BE2
BE3
B0
B1
B2
B3
SW
SW
SW
SW
A
B
OE
SW
PI3B3125/PI3B3126
3.3V, 4-Bit, 2-Port NanoSwitch
TM
w/Individual Enables
2
PS8153F 09/09/04
PI3B3125 14-Pin Configuration
PI3B3126 14-Pin Configuration
PI3B3125 16-Pin Configuration
PI3B3126 16-Pin Configuration
Pin Description
Pin Name
Description
BE
N
Switch Enable (PI3B3125)
BE
N
Switch Enable (PI3B3126)
A
3
-A
0
Bus A
B
3
-B
0
Bus B
V
CC
Power
GND
Ground
Truth Table
(1)
PI3B3125
BE
N
PI3B3126
BE
N
A
N
B
N
V
CC
Function
X
(2)
X
Hi-Z Hi-Z GND
Disconnect
H
L
Hi-Z Hi-Z V
CC
Disconnect
L
H
Bn
An
V
CC
Connect
Notes:
1. H = High Voltage Level, L = Low Voltage Level,
Hi-Z = High Impedance, X = Don't Care
2. 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........................................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 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 specification is not implied.
Exposure to absolute maximum rating conditions for ex-
tended periods may affect reliability.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
PI3B3125/PI3B3126
3.3V, 4-Bit, 2-Port NanoSwitch
TM
w/Individual Enables
3
PS8153F 09/09/04
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
8
Power Supply Characteristics
Parameters
Description
Test Conditions
(1)
Min. Typ.
(2)
Max.
Units
I
CC
Quiescent Power Supply Current
V
CC
= Max. V
IN
= GND or V
CC
0.1
3
A
I
CC
Supply Current per Input HIGH
V
CC
= Max. V
IN
= 3.0V
(3)
750
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
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
I
OFF
Off Current
V
CC
= 0, V
OUT
= 3 to 3.6V
10
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, 4-Bit, 2-Port NanoSwitch
TM
w/Individual Enables
4
PS8153F 09/09/04
PI3B3125 Switching Characteristics over Operating Range
Parameters
Description
Conditions
(1)
PI3B3125
Units
Com.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
C
L
= 50pF
R
L
= 500
0.25
ns
t
PZH
t
PZL
Bus Enable Time
C
L
= 50pF,
R
L
= 500,
1.0
3.0
t
PHZ
t
PLZ
Bus Disable Time
R
L
= 500
1.0
4.0
PI3B3126 Switching Characteristics over Operating Range
Parameters
Description
Conditions
(1)
PI3B3126
Units
Com.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
C
L
= 50pF
R
L
= 500
0.25
ns
t
PZH
t
PZL
Bus Enable Time
C
L
= 50pF,
R
L
= 500,
1.0
2.5
t
PHZ
t
PLZ
Bus Disable Time
R
L
= 500
1.0
4.0
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.
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, IN may be
driven low to 0V and high to 3.6V. Driving IN Rail-to-Rail minimizes power consumption.
Power-Supply Sequencing and Hot-Plug Information
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V
CC
and GND before applying signals to
input/output or control pins.
Rail-to-Rail is a registeredtrademark of Nippon Motorola, Ltd.
PI3B3125/PI3B3126
3.3V, 4-Bit, 2-Port NanoSwitch
TM
w/Individual Enables
5
PS8153F 09/09/04
Packaging Mechanical: 14-pin SOIC (W)
Packaging Mechanical: 14-pin TSSOP (L)
SEATING PLANE
.050
BSC
1
14
x 45
0-8
.149
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.78
3.99
.336
.344
8.55
8.75
.0155
.026
0.393
0.660
1.27
.053
.068
1.35
1.75
.2284
.2440
5.80
6.20
.013
.020
0.330
0.508
.0040
.0098
0.10
0.25
.0099
.0196
0.25
0.50
.0075
.0098
0.19
0.25
.016
.050
0.41
1.27
REF
0.193
0.201
0.047
0.002
0.006
SEATING
PLANE
0.0256
typical
0.018
0.030
0.004
0.008
0.240
0.264
1
14
0.169
0.177
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.05
0.15
6.1
6.7
0.45
0.75
0.09
0.20
4.3
4.5
1.20
max.
4.90
5.10
0.65
0.19
0.30
0.007
0.012
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