PI5C3257
Quad 2:1 Mux/DeMux Bus Switch
Features:
•
•
•
•
Near-Zero propagation delay
5Ω switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.2µA typical)
– Ideally suited for notebook applications
• Pin compatible with 74 series 257 logic devices
• Packaging (Pb-free & Green available):
– 16-pin 150-mil wide plastic QSOP (Q)
– 16-pin 150-mil wide plastic SOIC (W)
– 16-pin 173-mil wide plasticTSSOP (L)
Description
Pericom Semiconductor’s PI5C3257 is a 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 (5Ω)
with no additional ground bounce noise or propagation delay.
Block Diagram
IA0
IA1
IB0
IB1
IC0
IC1
ID0
ID1
Pin Configuration
S
IA0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
E
ID0
ID1
YD
IC0
IC1
YC
E
IA1
YA
IB0
S
IB1
YB
GND
YA
YB
YC
YD
Truth Table
(1)
E
S
YA
YB
YC
YD
Function
H
X
Hi-Z Hi-Z Hi-Z Hi-Z
Disable
L
L
IA0
IB0
IC0
ID0
S=0
L
H
IA1
IB1
IC1
ID1
S=1
Note:
1. H = High Voltage Level, L = Low Voltage Level
Pin Description
Pin Name
IAn-IDn
S
E
YA-YD
GND
V
cc
Description
Data Inputs
Select Inputs
Enable
Data Outputs
Ground
Power
13-0015
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01/14/13
Quad 2:1 Mux/DeMux Bus Switch
Maximum Ratings
PI5C3257
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ...........................................................–65°C
to +150°C
Ambient Temperature with Power Applied ..........................–40°C
to +85°C
Supply Voltage to Ground Potential (Inputs & V
CC
Only)
....–0.5V
to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only)
.–0.5V
to +7.0V
DC Input Voltage ...................................................................–0.5V
to +7.0V
DC Output Current..............................................................................
120mA
Power Dissipation ..................................................................................
0.5W
Note:
Stresses greater than those listed under MAXIMUM RAT-
INGS 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.
DC Electrical Characteristics
(Over the Operating Range, T
A
=
–40°C to +85°C, V
CC
= 5V ±5%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
I
OS
V
H
R
ON
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
Clamp Diode Voltage
Short Circuit Current
(3)
Input Hysteresis at Control Pins
Switch On-Resistance
(4)
V
cc
= Min.,
V
IN
= 0.0V,
I
ON
=
48mA
V
cc
= Min.,
V
IN
= 2.4V,
I
ON
= 15mA
Test Conditions
(1)
Min.
2.0
–0.5
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
cc
=
Max.,
V
IN
= V
cc
V
cc
= Max., V
IN
= GND
0 ≤
I, Y
≤
V
cc
V
cc
=
Min.,
I
IN
= –18
mA
I (Y) = 0V, Y (I) = V
cc
100
Typ
(2)
Max.
0.8
±1
±1
±1
Units
V
µA
V
mA
mV
–0.7
150
5
10
–1.2
7
15
Ω
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
= 5.0V,
T
A
= 25°C 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 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.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
c
IN
c
OFF
c
ON
Description
Input Capacitance
In/Yn Capacitance, Switch Off
In/Yn Capacitance, Switch On
V
IN
= 0V
Test Conditions
Typ
Max.
6
6
14
pF
Units
Notes:
1. This parameter is determined by device characterization but is not production tested.
13-0015
2
01/14/13
Quad 2:1 Mux/DeMux Bus Switch
Power Supply Characteristics
Parameters
I
cc
∆I
cc
Description
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
cc
=
Max.
V
cc
= Max.
V
cc
= Max.,
I and Y Pins Open
BE
= GND
Control Input Toggling
50% Duty Cycle
V
IN
= GND
or
V
cc
V
IN
= 3.4V
(3)
Min.
Typ
(2)
0.1
Max.
3.0
2.5
Units
µA
mA
PI5C3257
I
ccD
0.25
mA/
MHz
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
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V,
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
Parameters
t
IY
t
SY
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(1,2)
In to Yn
Bus Select Time
Sn to Yn
Bus Enable Time
E to Yn
Bus Disable Time
E to Yn
c
L
= 50pF
R
L
= 500Ω
0.5
0.5
0.5
Conditions
Com.
Min.
Max.
0.25
5.2
4.8
5.0
ns
Units
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.
13-0015
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01/14/13
Quad 2:1 Mux/DeMux Bus Switch
Packaging Mechanical: 16-Pin QSOP (Q)
DOCUMENT CONTROL NO.
PD - 1201
PI5C3257
16
REVISION: G
.008
0.20
MIN.
DATE: 11/07/07
.008
.013
0.20
0.33
.150
.157
3.81
3.99
Guage Plane
.010
0.254
1
.189
.197
4.80
5.00
.008
0.203 REF
Detail A
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.015 x 45°
0.38
1
.053
1.35
.069
1.75
SEATING
PLANE
Detail A
.007
0.178
.010
0.254
.025
BSC
0.635
.008
.012
0.203
0.305
.004
0.101
.010
0.254
.228
.244
5.79
6.19
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335
• www.pericom.com
DESCRIPTION:
16-Pin 150-Mil
Wide QSOP
PACKAGE CODE: Q
X.XX DENOTES DIMENSIONS IN MILLIMETERS
X.XX
Note:
1) Controlling dimensions in inches.
2) Ref:
JEDEC MO-137B/AB.
3) Dimensions do not include mold flash, protrusions or gate burrs
13-0015
4
01/14/13
DATE: 0
Quad 2:1 Mux/DeMux Bus Switch
Packaging Mechanical: 16-Pin SOIC (W)
PI5C3257
DATE: 06/15/12
DESCRIPTION: 16-Pin, 150mil Wide SOIC
PACKAGE CODE: W
DOCUMENT CONTROL #: PD-1004
2012-0398
REVISION: F
13-0015
5
01/14/13
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