1
PS8580 10/18/01
Product Description
Pericom Semiconductor's PI3B series of logic circuits are produced
using the Company's advanced submicron CMOS technology,
achieving industry leading performance.
The PI3B3383 is a 5-bit, 4-port bus switch with exchange designed
with a low ON resistance allowing inputs to be connected directly
to outputs. The bus switch creates no additional propagational
delay or additional ground bounce noise. The switches are turned
ON by the Bus Enable (BE) input signal, and the Bus Exchange (BX)
input signal offers nibble swapping of the AB and CD pairs of
signals. This exchange configuration allows byte swapping of buses
in systems. It can also be used as a quad 2-to-1 multiplexer and to
create low delay barrel shifters, etc.
Product Pin Description
Pin Name
Description
BE
Bus Enable Input (Active LOW)
BX
Bus Exchange Input
Ax
Bus A
Bx
Bus B
Cx
Bus C
Dx
Bus D
GND
Ground
V
CC
Power
Logic Block Diagram
Function
BE
BX
A
0-A4
B
0-B4
Disconnect
H
X
Hi-Z
Hi-Z
Connect
L
L
C
0-C4
D
0-D4
Exchange
L
H
D
0-D4
C
0-C4
Truth Table
(1)
Note:
1. H
= High Voltage Level
X
= Don't Care
L
= Low Voltage Level
Hi-Z = High Impedance
Product Features
Near-zero propagation delay
5
switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power (0.1A typical)
Ideally suited for notebook applications
Packages available:
24-pin 173-mil wide plastic TSSOP (L)
24-pin 150-mil wide plastic QSOP (Q)
BE
BX
B
4
A
4
D
4
C
4
B
0
A
0
D
0
C
0
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
BE
C
0
A
0
B
0
D
0
C
1
A
1
B
1
D
1
C
2
A
2
GND
Vcc
D
4
B
4
A
4
C
4
D
3
B
3
A
3
C
3
D
2
B
2
BX
24-Pin
L, Q, S
Product Pin Configuration
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PI3B3383
3.3V, 5-Bit, 4-Port Bus
Exchange NanoSwitch
TM
PI3B3383
3.3V, 5-Bit, 4-Port Bus Exchange
NanoSwitch
TM
2
PS8580 10/18/01
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Capacitance
(T
A
= 25C, f = 1 MHz)
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 ............................................................................ 120 mA
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 specifica-
tion is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
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 AB and CD pin at indicated current through the switch. ON resistance is determined by
the lower of the voltages on the two (A or B, C or D) pins.
4. This parameter is determined by device characterization but is not production tested.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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2
PI3B3383
3.3V, 5-Bit, 4-Port Bus Exchange
NanoSwitch
TM
3
PS8580 10/18/01
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12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Power Supply Characteristics
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
= 3.0V, +25C ambient.
3. Per LVTTL driven input (V
IN
= 2.4V, control inputs only); A, B, C, and D pins do not contribute to I
CC
.
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.
PI3B3383 Switching Characteristics over Operating Range
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PI3B3383
3.3V, 5-Bit, 4-Port Bus Exchange
NanoSwitch
TM
4
PS8580 10/18/01
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Applications
Logic Inputs
The logic control inputs can be driven up to +3.6V regardless of the supply voltage. For example, given a 3.0V supply, the control or
select pins may be driven low to 0V and high to 3.6V. Driving the control or select pins Rail-toRail minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC before applying signals to the input/
output or control pins.
t
r
a
P
e
g
a
k
c
a
P
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P
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t
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T
L
3
8
3
3
B
3
I
P
)
L
(
P
O
S
S
T
4
2
C
5
8
+
o
t
C
0
4
Q
3
8
3
3
B
3
I
P
)
Q
(
P
O
S
Q
4
2
Ordering Information
Parameter Measurements
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Notes:
1. C
L
includes probe and jig capacitance.
2. Waveform 1 is for an output with internal conditions such that the output is LOW except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is HIGH except when disabled by the output control.
3. All input pulses are supplied by generators having the following characteristics: PRR<10MHz, Z
O
= 50
, t
r
2.5ns, t
f
2.5ns.
4. The outputs are measured one at a time with one transition per measurement.
5. t
PLZ
and t
PHZ
are the same as t
dis
.
6. t
PZL
and t
PZH
are the same as t
en
.
7. t
PLH
and t
PHL
are the same as t
pd
.
t
PZL
Output
Control
(Low Level
Enabling)
0V
1.5V
1.5V
1.5V
1.5V
t
PLZ
t
PHZ
V
OL
3V
0V
t
PZH
+0.3V
-0.3V
Output
Waveform 1
S1 at 6V
(see Note 2)
Output
Waveform 2
S1 at Open
(see Note 2)
V
OH
V
OH
V
OL
3V
t
s
e
T
1
S
t
D
P
n
e
p
O
t
Z
L
P
t
/
L
Z
P
V
6
t
Z
H
P
t
/
H
Z
P
D
N
G
500
500
GND
6V
Open
S1
LOAD CIRCUIT
From Output
Under Test
CL = 50pF
(See note 1)
Input
t
PLH
t
PHL
3V
1.5V
1.5V
1.5V
1.5V
0V
Output
V
OH
V
OL
PI3B3383
3.3V, 5-Bit, 4-Port Bus Exchange
NanoSwitch
TM
5
PS8580 10/18/01
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24-Pin TSSOP (L) Package
.303
.311
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
24
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
7.7
7.9
0.65
0.19
0.30
.007
.012
Max
24-Pin QSOP (Q) Package
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
typical
.007
.010
.228
.244
1
24
.150
.157
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.20
0.406
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.033
0.84
0.38
.015 x 45
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
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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