1
PS8151F 05/07/01
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI3B3257 is a 3.3 Volt, Quad 2:1 multiplexer/demultiplexer with
three-state outputs that is pinout and function compatible with the
PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be
connected to outputs with low ON resistance (5 ohms) with no
additional ground bounce noise or propagation delay.
Logic Block Diagram
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
Product Features
Near zero propagation delay
5-ohm switches connect inputs to outputs
Fast Switching Speed: 4.8ns max.
Ultra-Low Quiescent Power: 0.1A typical
Ideally suited for notebook applications
Pin compatible with 74 series 257 logic devices
Packages available:
16-pin 150 mil wide plastic QSOP (Q)
16-pin 150 mil wide plastic SOIC (W)
16-pin 173 mil wide plastic TSSOP (L)
16-Pin Product Configuration
Product Pin Description
Truth Table
(1)
Note: 1. H = High Voltage Level
L = Low Voltage Level
E
IA
0
IA
1
IB
0
IB
1
IC
0
IC
1
ID
0
ID
1
S
YA
YB
YC
YD
V
CC
S
1
E
IA0
2
ID0
IA1
3
ID1
YA
4
YD
IB0
5
16
IC0
IB1
6
15
IC1
YB
7
14
YC
8
13
12
GND
11
10
9
16-Pin
Q, W, L
E
S
A
Y
B
Y
C
Y
D
Y
n
o
it
c
n
u
F
H
X
Z
-i
H
Z
-i
H
Z
-i
H
Z
-i
H
el
b
a
si
D
L
L
0
A
I
0
B
I
0
C
I
0
D
I
0
=
S
L
H
1
A
I
1
B
I
1
C
I
1
D
I
1
=
S
e
m
a
N
n
i
P
n
o
it
p
i
r
c
s
e
D
n
D
I
-
n
A
I
st
u
p
n
I
a
t
a
D
S
st
u
p
n
I
t
c
el
e
S
E
el
b
a
n
E
D
Y
-
A
Y
st
u
p
t
u
O
a
t
a
D
D
N
G
d
n
u
o
r
G
c
c
V
r
e
w
o
P
C
N
t
c
e
n
n
o
C
o
N
2
PS8151F 05/07/01
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
Capacitance
(T
A
= 25C, f = 1 MHz)
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 I and Y pin at indicated current through the switch. ON resistance is determined by the
lower of the voltages on the two (I,Y) 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.)
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
=
1
I
H
Z
O
t
n
e
rr
u
C
t
u
p
t
u
O
e
c
n
a
d
e
p
m
I
h
g
i
H
0
I
N
Y
,
N
V
C
C
1
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
I
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
)
3
(
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
=
V
C
C
V
,.
n
i
M
=
N
I
I
,
V
4
.
2
=
N
O
A
m
5
1
=
5
0
1
8
7
1
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
l
a
c
i
p
y
T
s
ti
n
U
C
N
I
e
c
n
a
ti
c
a
p
a
C
t
u
p
n
I
V
N
I
V
0
=
0
.
3
F
p
C
N
Y
F
F
O
Y
N
ff
O
h
c
ti
w
S
,
e
c
n
a
ti
c
a
p
a
C
V
N
I
V
0
=
0
.
7
1
C
N
I
F
F
O
I
N
ff
O
h
c
ti
w
S
,
e
c
n
a
ti
c
a
p
a
C
V
N
I
V
0
=
5
.
8
C
N
O
I
N
Y
/
N
n
O
h
c
ti
w
S
,
e
c
n
a
ti
c
a
p
a
C
V
N
I
V
0
=
0
.
5
2
3
PS8151F 05/07/01
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
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
= 3.3V, +25C ambient.
3. Per TTL driven input (control inputs only); I and Y 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 I and Y inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is
guaranteed by design.
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 switchs time constant 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.
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
)
1
(
7
5
2
3
B
3
I
P
s
ti
n
U
.
m
o
C
.
n
i
M
.
x
a
M
t
Y
I
n
Y
o
t
n
I
y
al
e
D
n
o
it
a
g
a
p
o
r
P
)
3
,
2
(
C
L
F
p
0
5
=
R
L
0
0
5
=
5
2
.
0
s
n
t
Y
S
n
Y
o
t
n
S
,
e
m
i
T
t
c
el
e
S
s
u
B
1
5
.
4
t
H
Z
P
t
L
Z
P
n
Y
o
t
E
,
e
m
i
T
el
b
a
n
E
s
u
B
1
5
.
4
t
Z
H
P
t
Z
L
P
n
Y
o
t
E
,
e
m
i
T
el
b
a
si
D
s
u
B
1
8
.
4
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
I
C
C
t
n
e
rr
u
C
y
l
p
p
u
S
r
e
w
o
P
t
n
e
c
s
ei
u
Q
V
C
C
.
x
a
M
=
V
N
I
r
o
D
N
G
=
V
C
C
1
.
0
0
.
3
A
I
C
C
H
G
I
H
L
T
T
@
t
u
p
n
I
r
e
p
t
n
e
rr
u
C
y
l
p
p
u
S
)
4
,
3
(
V
C
C
.
x
a
M
=
V
N
I
=
V
0
.
3
0
5
7
4
PS8151F 05/07/01
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
.189
.197
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
1
16
.150
.157
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
4.80
5.00
1.35
1.75
5.79
6.19
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
0.38
0.41
1.27
.008
0.203
.015 x 45
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
SEATING PLANE
.050
BSC
1
16
0-8
.149
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.78
3.99
.386
.393
9.80
10.00
1.27
.053
.068
1.35
1.75
.2284
.2440
5.80
6.20
.0040
.0098
0.10
0.25
.013
.020
.0155
.0260
0.330
0.508
0.393
0.660
.0075
.0098
0.25
0.50
.0099
.0196
x 45
0.19
0.25
.016
.050
0.41
1.27
REF
16-Pin QSOP (Q) Package
16-Pin SOIC (W) Package
5
PS8151F 05/07/01
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
t
r
a
P
e
g
a
k
c
a
P
-
n
i
P
h
t
d
i
W
Q
7
5
2
3
B
3
I
P
)
Q
(
P
O
S
Q
-
6
1
li
m
-
0
5
1
W
7
5
2
3
B
3
I
P
)
W
(
C
I
O
S
-
6
1
li
m
-
0
5
1
L
7
5
2
3
B
3
I
P
)
L
(
P
O
S
S
T
-
6
1
li
m
-
3
7
1
Ordering Information
.193
.201
.047
max.
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
16
.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
1.20
4.9
5.1
0.65
0.19
0.30
.007
.012
16-Pin TSSOP (L) Package
PDF 
ZIP