1
PS8337A 03/31/99
NC
1
2
3
4
5
6
7
8
9
GND
10
11
12
13
14
15
16
17
18
19
20
GND
BE
1
40
39
38
37
36
35
V
CC
34
33
32
31
30
29
28
27
26
25
24
23
22
B
15
21
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
NC
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
B
14
B
13
B
12
B
11
B
10
B
9
B
8
BE
2
V
CC
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
Product Features
Fast Switching Speed: 4.5ns max.
Permits Hot Insertion
Near-zero propagation delay
5
switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power (1.0A typical)
Ideally suited for notebook applications
Industrial operating temperature: 40C to +85C
TTL - compatible control of input levels
Packages available:
40-pin 150 mil wide plastic BQSOP (B)
Logic Block Diagram
Product Pin Configuration
Product Pin Description
Pin Name
I/O
Description
BEn
I
Bus Enable Input (Active LOW)
A
0
-A
15
I/O
Bus A
B
0
-B
15
I/O
Bus B
Function
BEn A
0
15
Disconnect
H
Hi-Z
Connect
L
B
0
15
Truth Table
(1)
Notes:
1. H= High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
using the Companys advanced submicron CMOS technology.
The PI3B32X245 is a 3.3V,16-bit, 2-port bus switch. Two enable
signals (BEn) turn the switches on. The bus switch creates no
additional propagational delay or additional ground bounce noise.
PI3B32X245
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40-Pin
B
3.3V, Hot Insertion 16-Bit, 2-Port Bus Switch
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2
PS8337A 03/31/99
PI3B32X245
3.3V, Hot Insertion 16-Bit, 2-Port BusSwitch
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Storage Temperature......................................................... 65C to +150C
Ambient Temperature with Power Applied ........................ 40C to +85C
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 +7.0V
DC Output Current ........................................................................... 120mA
Power Dissipation ................................................................................ 0.5W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional opera-
tion 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.
Parameters
(5)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.5
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
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. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. 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.
5. 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.)
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
s
r
e
t
e
m
a
r
a
P
n
o
it
p
i
r
c
s
e
D
s
n
o
it
i
d
n
o
C
t
s
e
T
)
1
(
.
n
i
M
.
p
y
T
)
2
(
.
x
a
M
s
ti
n
U
V
H
I
e
g
a
tl
o
V
H
G
I
H
t
u
p
n
I
l
e
v
e
L
H
G
I
H
ci
g
o
L
d
e
e
t
n
a
r
a
u
G
0
.
2
V
V
L
I
e
g
a
tl
o
V
W
O
L
t
u
p
n
I
l
e
v
e
L
W
O
L
ci
g
o
L
d
e
e
t
n
a
r
a
u
G
5
.
0
-
8
.
0
I
H
I
t
n
e
rr
u
C
H
G
I
H
t
u
p
n
I
V
C
C
V
,.
x
a
M
=
N
I
V
=
C
C
1
A
I
L
I
t
n
e
rr
u
C
W
O
L
t
u
p
n
I
V
C
C
V
,.
x
a
M
=
N
I
D
N
G
=
I
H
Z
O
t
n
e
rr
u
C
t
u
p
t
u
O
e
c
n
e
d
e
p
m
I
h
g
i
H
0
B
,
A
V
C
C
V
K
I
e
g
a
tl
o
V
e
d
o
i
D
p
m
al
C
V
C
C
I
,.
n
i
M
=
N
N
A
m
8
1
-
=
2
.
1
-
V
R
N
O
e
c
n
a
t
si
s
e
R
n
O
h
c
ti
w
S
)
4
(
V
C
C
V
,.
n
i
M
=
N
I
I
,
V
0
.
0
=
N
O
A
m
4
6
r
o
A
m
8
4
=
5
8
V
C
C
V
,.
n
i
M
=
N
I
I
,
V
4
.
2
=
N
O
A
m
5
1
=
0
1
7
1
Capacitance
(T
A
= 25C, f = 1 MHz)
3
PS8337A 03/31/99
PI3B32X245
3.3V, Hot Insertion 16-Bit, 2-Port BusSwitch
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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
1.0
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 (V
IN
= 3.4V, control inputs only); A and B pins do not contribute to I
CC
.
4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified
frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is
guaranteed by design.
PI3B32X245
Com.
Parameters Description
Conditions
(1)
Min.
Max. Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
0.25
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
t
PZH
Bus Enable Time
1.0
4.0
ns
t
PZL
BEx to Ax or Bx
t
PHZ
Bus Disable Time
1.0
4.5
t
PLZ
BEx to Ax or Bx
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.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
PI3B32X245 Switching Characteristics over Operating Range
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