1
PS8172E 09/10/04
Features
Near-Zero propagation delay
R
ON
is 5 typical at 3.3V
Fast switching speed: 4.5ns (max.)
V
CC
operating range: 3.0V to 3.6V
500 pulldown to the unconnected B port
Industrial operating temperature: 40C to +85C
Make-before-break action
Packaging (Pb-free & Green):
80-pin BQSOP (B)
Description
Pericom Semiconductor's PI3B16248 is a 3.3V, 24-bit to 48-bit
Mux/DeMux Bus Switch designed with a low On-Resistance
allowing inputs to be connected directly to outputs.
PI3B16248
Block Diagram
Truth Table
(1)
Function
S2/S1
A
A to 1B
L
1B
A to 2B
H
2B
Note:
1. H = High Voltage Level, L = Low Voltage Level
3.3V, 24-Bit to 48-Bit
Mux/DeMux NanoSwitch
TM
A
1
1
B
1
2
B
1
500
A
12
S
1
1
B
12
2
B
12
500
A
13
1
B
13
2
B
13
500
A
24
S
2
1
B
24
2
B
24
500
B
A
S
SW
3
PS8172E 09/10/04
PI3B16248
3.3V, 24-Bit to 48-Bit,
Mux/DeMux NanoSwitch
TM
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.0 to 3.6V)
Parameters
Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
IH
Input HIGH Voltage
S1, S2
2.0
V
V
IL
Input LOW Voltage
S1, S2
-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
R
ON
Switch On-Resistance
V
CC
= Min., V
IN
= 0V, I
ON
= 24mA
5
8
V
CC
= Min., V
IN
= 0V, I
ON
= 12mA
10
15
C
IN
Input Capacitance
V
CC
= 0V, 25C, f = 1 MHz
3.0
pF
C
ON
Output Capacitance
V
CC
= 0V, 25C, f = 1 MHz
25.0
I
CC
Power Supple Quiescent
V
CC
= Max., V
IN
= GND or V
CC
20
A
I
OZH
High Impedance Output Current 0 A, B V
CC
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= -18mA
`
-0.7
-1.2
V
Storage Temperature ........................................................ 65C to +150C
Ambient Temperature with Power Applied ....................... 40C to +85C
Supply Voltage Range......................................................... 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. Ex-
posure to absolute maximum rating conditions for extended
periods may affect reliability.
Notes:
1. This parameter is guaranteed but not tested on Propagation Delays.
2. 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.
3. See test circuit and waveforms.
Note:
1. Typical values are shown at V
CC
= 3.3V, +25C ambient and maximum loading.
Electrical Characteristics
(V
CC
= 3.0V to 3.6V, T
A
=
40C to +85C)
Parameters
Description
Test Conditions
Com.
Units
Min.
Max.
t
PLH
Propagation Delay A
X
to B
X
C
L
= 50pF, R
L
= 500
250
ps
t
EN
(3)
Bus Enable
C
L
= 50pF
R
L
= 500
R = 500
1
4.5
ns
t
DIS
(3)
Bus Disable
1
5.0
t
M
Make-before-break time
0
2
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
4
PS8172E 09/10/04
PI3B16248
3.3V, 24-Bit to 48-Bit,
Mux/DeMux NanoSwitch
TM
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
3.80
4.00
0.254
.0197
0.50
5
Gauge Plane
.150
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.228
.244
5.80
6.20
.010
.063
.010
.016
0.254
0.406
0.803
0.811
20.40
20.60
.007
.010
0.17
0.27
40
80
x 45
41
1
.019
1.60
.002
.009
0.05
0.25
.078
2.0
5
.019
.029
0.50
0.75
.008 NOM
0.203
0.50
REF
BSC
Max
Nom
BSC
Packaging Mechanical: 80-pin BQSOP (B)
Applications Information
Logic Inputs
Logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a 5.0V supply, the control or
select pins may be driven low to 0V and high to 5.5V. Driving the control or select pins Rail-toRail
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 the
input/output or control pins.
Ordering Information
Ordering Code
Package Code
Package Description
PI3B16248B
B
80-pin BQSOP
PI3B16248BE
B
Pb-free & Green, 80-pin BQSOP
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
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