1
PS8149F 08/25/04
BE
2
BE
1
1B
1
1B
0
1A
1
1A
0
1B
1
1B
0
1A
3
1A
2
2B
1
2B
0
2A
1
2A
0
2B
3
2B
2
2A
3
2A
2
B
A
BE
SW
SW
SW
SW
SW
SW
SW
SW
SW
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
BE1
1
A
0
2
B
3
1
A
1
2
B
2
1
A
2
2
B
1
1
A
3
2
B
0
GND
Vcc
BE
2
1
B
0
2
A
3
1
B
1
2
A
2
1
B
2
2
A
1
1
B
3
2
A
0
Description
Pericom Semiconductor's PI3B series of logic circuits are produced
using the Company's advanced sub-micron CMOS technology,
achieving industry leading performance.
The PI3B3244 features a set of 3.3V 8-bit bus switches, which is
pinout and function compatible with the P74FCT244T, 74F244, and
74ALS/AS/LS2448-bit drivers. Two enable signals (BEn) turn the
switches on similar to the enable signals of the 244. The bus switch
create no additional propagation delay or ground bounce noise.
Truth Table
(1)
Note:
1. H = High Voltage Level, L = Low Voltage Level
Block Diagram
Pin Description
Pin Name
Description
BEn
Bus Enable Input (Active LOW)
A
0
7
Bus A
B
0
7
Bus B
GND
Ground
V
CC
Power
Pin Configuration
PI3B3244
3.3V, Hot Insertion,
8-Bit, 2-Port NanoSwitchTM
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Features
Near-Zero propagation delay
5-ohm switches connect inputs to outputs when enabled
Fast Switching Speed - 4.5ns max.
Ultra-Low Quiescent Power (0.2A Typical)
Ideally suited for notebook applications
Pin compatible with 74 series 244 logic devices
Packaging:
20-pin 150-mil wide plastic QSOP (Q)
20-pin 173-mil wide plastic TSSOP (L)
20-Pin
Q,L
1
E
B
2
E
B
B
1
,
A
1
B
2
,
A
2
H
H
t
c
e
n
n
o
c
s
i
D
t
c
e
n
n
o
c
s
i
D
L
H
B
1
=
A
1
t
c
e
n
n
o
c
s
i
D
H
L
t
c
e
n
n
o
c
s
i
D
B
2
=
A
2
L
L
B
1
=
A
1
B
2
=
A
2
PI3B3244
3.3V, Hot Insertion
8-Bit, 2-Port NanoSwitchTM
2
PS8149F 08/25/04
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.0
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
8.0
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
16.0
pF
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
OZH
High Impedance Output Current 0
I
N
, Y
N
V
CC
1
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 64mA
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 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.
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 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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
PI3B3244
3.3V, Hot Insertion
8-Bit, 2-Port NanoSwitchTM
3
PS8149F 08/25/04
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI3B3244
Com.
Parameters Description
Conditions
(1)
Min.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50 pF,
0.25
ns
t
PHL
Ax to Bx
R
L
= 500
t
PZH
Bus Enable Time
C
L
= 50 pF,
1.0
4.0
ns
t
PZL
BE to Ax or Bx
R
L
= 500
,
t
PHZ
Bus Disable Time
R
L
= 500
1.0
4.5
ns
t
PLZ
BE to Ax or Bx
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
3.0
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.0V
(3)
750
A
Input @ TTL HIGH
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 TTL driven input (control inputs only); A and B pins do not contribute to I
CC
.
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.
Applications Information
Logic Inputs
The logic control inputs can be driven up to +3.6 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
PI3B3244
3.3V, Hot Insertion
8-Bit, 2-Port NanoSwitchTM
4
PS8149F 08/25/04
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
.150
.157
1
20
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.19
0.41
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.058
1.47
.015 x 45
0.38
REF
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0-6
.008
.013
0.20
0.33
.252
.260
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.238
.269
1
20
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.1
6.7
0.45
0.75
0.09
0.20
4.3
4.5
6.4
6.6
0.65
0.19
0.30
.007
.012
Max
Packaging Mechanical: 20-Pin QSOP (Q)
Packaging Mechanical: 20-Pin TSSOP (L)
PI3B3244
3.3V, Hot Insertion
8-Bit, 2-Port NanoSwitchTM
5
PS8149F 08/25/04
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Ordering Information
Ordering Code
Package Code
Package Type
PI3B3244Q
Q
20-pin QSOP
PI3B3244QE
Q
Pb-free & Green, 20-pin QSOP
PI3B3244L
L
20-pin TSSOP
PI3B3244LE
L
Pb-free & Green, 20-pin TSSOP
PDF 
ZIP