ADVANCE INFORMATION
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2B3125
PI2B3126
2.5V, Hot Insertion,
4-Bit, 2-Port Bus Switch
with Individual Enables
Product Features
Near zero propagation delay
Fast Switching Speed - 3.5ns max.
Permits Hot Insertion
Ultra Low Quiescent Power (10µA max.)
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)
Product Description
Pericom Semiconductors PI2B series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading speed grades.
The PI2B3125 and PI2B3126 are 2.5-Volt, 4-bit bus switches designed
with four individual bus switches with fast individual 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 PI2B3125 device has active LOW enables, and the PI2B3126
has active HIGH enables.
PI2B3125 Logic Block Diagram
A0
BE0
A1
BE1
A2
BE2
A3
BE3
B3
B2
B1
B0
PI2B3126 Logic Block Diagram
A0
BE0
A1
BE1
A2
BE2
A3
BE3
B3
B2
B1
B0
1
PXXXX
08/14/01
ADVANCE INFORMATION
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2B3125/PI2B3126
2.5V, Hot Insertion,
4-Bit, 2-Port Bus Switch
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 +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 condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure to
absolute maximum rating conditions for extended
periods may affect reliability.
PI2B3125 14-Pin
Product Pin Configuration
BE0
A0
B0
BE1
A1
B1
GND
1
14
2
13
3
12
14-Pin
11
4
5
W, L
10
6
9
7
8
Vcc
BE3
A3
B3
BE2
A2
B2
PI2B3126 14-Pin
Product Pin Configuration
BE0
A0
B0
BE1
A1
B1
GND
1
14
2
13
3
12
14-Pin
11
4
5
W, L
10
6
9
7
8
Vcc
BE3
A3
B3
BE2
A2
B2
PI2B3125 16-Pin
Product Pin Configuration
NC
BE0
A0
B0
BE1
A1
B1
GND
1
16
2
15
3
14
16-Pin
13
4
Q
12
5
6
11
7
10
8
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
PI2B3126 16-Pin
Product Pin Configuration
NC
BE0
A0
B0
BE1
A1
B1
GND
1
16
2
15
3
14
16-Pin
13
4
Q
12
5
6
11
7
10
8
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
Product Pin Description
Pin Name
BEn
BEn
A3- A0
B3- B0
VCC
GND
De s cription
Switch Enable (PI2B3125)
Switch Enable (PI2B3126)
Bus A
Bus B
Power
Ground
Truth Table
(1)
PI2B3125
BEn
X*
H
L
PI2B3125
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
Connect
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.
2
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08/14/01
ADVANCE INFORMATION
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2B3125/PI2B3126
2.5V, Hot Insertion,
4-Bit, 2-Port Bus Switch
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40°C to +85°C, V
CC
= 2.3V to 2.7V)
Parame te rs
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
ON
De s cription
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
Clamp Diode Voltage
Switch ON Resistance(3)
Te s t Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
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., Vi
IN
= 0.0V, I
ON
= 64mA
V
CC
= Min., V
IN
= 1.6V, I
ON
= 15mA
5
13
M in.
1.6
0.3
0.8
±1
±1
±1
1.2
8
20
V
Ω
Typ.
(2)
M ax.
Units
V
V
µA
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parame te rs
(4)
C
IN
C
O FF
De s cription
Input Capacitance
A/B Capacitance, Switch Off
Te s t Conditions
V
IN
= 0V
Typical
4.0
Units
pF
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
= 2.5V, 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.
4. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Parame te rs
I
CC
∆I
CC
D e s cription
Q uiescent Power Supply Current
Supply Current per Input HIGH
Te s t Conditions
V
CC
= Max.
V
IN
= GND or V
CC
V
IN
= 2.1V
(3)
1.9
M in.
Typ.
M ax.
10
300
Units
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
= 2.5V, +25°C ambient.
3. Per driven input (control inputs only); A and B pins do not contribute to I
CC
.
3
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08/14/01
ADVANCE INFORMATION
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2B3125/PI2B3126
2.5V, Hot Insertion,
4-Bit, 2-Port Bus Switch
Switching Characteristics over Operating Range
Com.
Parame te rs
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
D e s cription
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BE or BE to Ax or Bx
Bus Disable Time
BE or BE to Ax or Bx
Conditions
(1)
C
L
= 50pF,
R
L
= 5
0
0 ohms
C
L
= 50pF,
R
L
= 5
0
0 ohms
,
R = 5
0
0 ohms
1
1
M ax.
M in.
0.25
4.5
5.0
ns
Units
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 +2.7V regardless of the supply voltage. For example, given a +2.5V supply, Bus Enable
(BE or BE) may be driven low to 0V and high to 2.7V. Driving BE or BE Rail-to-Rail
®
minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is advised for all CMOS devices. It is recommended to always apply Vcc before applying signals to
the input/output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
4
PXXXX
08/14/01
ADVANCE INFORMATION
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2B3125/PI2B3126
2.5V, Hot Insertion,
4-Bit, 2-Port Bus Switch
14-pin SOIC (W) Package
14
.149
.157
3.78
3.99
0-8˚
.0099
.0196
0.25 x 45˚
0.50
.0075
.0098
0.41
1.27
.2284
.2440
5.80
6.20
.016
.050
0.19
0.25
1
.336
.344
8.55
8.75
.0155
.026
0.393
0.660
REF
.053
.068
1.35
1.75
SEATING PLANE
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
.050
BSC
1.27
.013
.020
0.330
0.508
.0040 0.10
.0098 0.25
14-pin TSSOP (L) Package
14
0.004 0.09
0.008 0.20
0.169
0.177
4.3
4.5
0.45
0.75
0.018
0.030
1
0.193
0.201
4.90
5.10
0.240
0.264
6.1
6.7
0.047
1.20
max.
SEATING
PLANE
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
0.0256
typical
0.65
0.007
0.012
0.19
0.30
0.002 0.05
0.006 0.15
5
PXXXX
08/14/01
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