Diodes' PI3B series of logic circuits are produced using the
Company’s 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 5 Ohm 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.
PI3B3125 Logic Block Diagram
A0
BE0
A1
BE1
A2
BE2
A3
BE3
A
B
SW
B3
SW
PI3B3126 Logic Block Diagram
A0
BE0
SW
B0
SW
B0
SW
B1
A1
BE1
SW
B1
SW
B2
A2
BE2
A3
BE3
SW
B2
SW
B3
SW
A
B
BE
OE
All trademarks are property of their respective owners.
17-0007
1
www.diodes.com
01/09/17
A product Line of
Diodes Incorporated
PI3B3125/PI3B3126
PI3B3125
14-Pin Product Configuration
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
PI3B3126
14-Pin Product Configuration
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
PI3B3125
16-Pin Product Configuration
NC
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PI3B3126
16-Pin Product Configuration
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
Pin Description
Pin Name
BEn
BEn
A3-A0
B3-B0
V
CC
GND
Truth Table
(1)
PI3B3125 PI3B3126
BEn
BEn
X
(2)
H
L
X
L
H
Description
Switch Enable (PI3B3125)
Switch Enable (PI3B3126)
Bus A
Bus B
Power
Ground
An
Hi-Z
Hi-Z
Bn
Bn
Hi-Z
Hi-Z
An
V
CC
V
CC
V
CC
Function
Disconnect
Connect
GND Disconnect
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.
All trademarks are property of their respective owners.
17-0007
2
www.diodes.com
01/09/17
A product Line of
Diodes Incorporated
PI3B3125/PI3B3126
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........................................
–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 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.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.3V ±10%)
Parameter Description
V
IH
V
IL
I
IH
I
IL
I
OFF
V
IK
R
ON
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Off Current
Clamp Diode Voltage
Switch On Resistance
(3)
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max., V
IN
= Vcc
V
CC
= Max., V
IN
= GND
V
CC
= 0, V
OUT
= 3 to 3.6V
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
Min.
2.0
-0.5
Typ.
(2)
Max.
0.8
±1
±1
10
-1.2
Units
V
V
MA
MA
MA
V
Ω
5
10
8
17
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. 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)
Parameter
(1)
C
IN
C
OFF
Description
Input Capacitance
A/B Capacitance, Switch Off
Test Conditions
V
IN
= 0V
V
IN
= 0V
Min.
Typ.
3.5
8
Max.
Units
pF
pF
Note:
1. This parameter is determined by device characterization but is not production tested.
Power Supply Chatacteristics
Parameter
I
CC
∆I
CC
Description
Quiescent Power Supply Current
Supply Current per Input HIGH
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
IN
= GND or V
CC
V
IN
= 3.0V
(3)
Min.
Typ.
(2)
0.1
Max.
3
750
Units
μA
μA
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, +25°C ambient.
3. Per driven input (control inputs only); A and B pins do not contribute to I
CC
.
All trademarks are property of their respective owners.
17-0007
3
www.diodes.com
01/09/17
A product Line of
Diodes Incorporated
PI3B3125/PI3B3126
PI3B3125 Switching Characteristics over Operating Range
PI3B3125
Com.
Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
Bus Disable Time
Conditions
(1)
C
L
= 50pF
R
L
= 500Ω
C
L
= 50pF
R
L
= 500Ω
R
L
= 500Ω
Min.
Max.
0.25
Units
ns
ns
ns
1.0
1.0
3.0
4.0
PI3B3126 Switching Characteristics over Operating Range
PI3B3126
Com.
Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
Bus Disable Time
Conditions
(1)
C
L
= 50pF
R
L
= 500Ω
C
L
= 50pF
R
L
= 500Ω
R
L
= 500Ω
Min.
Max.
0.25
Units
ns
ns
ns
1.0
1.0
2.5
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.
All trademarks are property of their respective owners.
17-0007
4
www.diodes.com
01/09/17
A product Line of
Diodes Incorporated
PI3B3125/PI3B3126
Packaging Mechanical: 14-pin TSSOP (L)
16-0060
All trademarks are property of their respective owners.
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