1
PS7017C 09/14/04
PI5C3253
Dual 4:1 Mux/DeMux Bus Switch
Features
Near-Zero propagation delay
5 switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.2A Typical)
Ideally suited for notebook applications
Pin compatible with 74 series 253 logic devices
Packaging (Pb-free & Green available):
16-pin 150-mil wide plastic QSOP (Q)
16-pin 300-mil wide plastic SOIC (S)
16-pin 150-mil wide plastic SOIC (W)
16-pin 173-mil wide plastic TSSOP (L)
Block Diagram
Truth Table
(1)
Enable
Select
EA
EB
S
1
S
0
YA
YB
Function
H
X
X
X
Hi-Z
X
Disable A
X
H
X
X
X
Hi-Z
Disable B
L
L
L
L
IA
0
IB
0
S1-0 = 0
L
L
L
H
IA
1
IB
1
S1-0 = 1
L
L
H
L
IA
2
IB
2
S1-0 = 2
L
L
H
H
IA
3
IB
3
S1-0 = 3
Description
Pericom Semiconductor's PI5C3253 is a Dual 4:1 Multiplexer/
demultiplexer with three-state outputs that is pinout compatible
with the PI74FCT253T, 74F253, and 74ALS/AS/LS 253. Inputs
can be connected to outputs with low on resistance (5) with no
additional ground bounce noise or propagation delay.
Pin Configuration
Pin Description
Pin Name
Description
IAn, IBn
Data Inputs
S01
Select Inputs
EA, EB
Enable
YA, YB
Data Outputs
GND
Ground
V
CC
Power
Note:
1. H = High Voltage Level, L = Low Voltage Level
EA
IA0 IA1 IA2 IA3 IB0 IB1 IB2 IB3
EB
S0
S1
YA
YB
VCC
EA
1
EB
S1
2
S0
IA3
3
IB3
IA2
4
IB2
IA1
5
16
IB1
IA0
6
15
IB0
YA
7
14
YB
8
13
12
GND
11
10
9
PI5C3253
Dual 4:1 Mux/DeMux Bus Switch
2
PS7017C 09/14/04
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 +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
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 condi-
tions for extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 5%)
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
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
I
OZH
High Impedance Output Current
0 I
N
, Y
N
V
CC
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.7
1.2
V
I
OS
Short Circuit Current
(3)
I (Y) = 0V, Y (I) = V
CC
100
mA
V
H
Input Hysteresis at Control Pins
150
mV
R
ON
Switch On-Resistance
(4)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
5
7
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
10
15
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
Typ.
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
6
pF
C
OFF
I
A
/I
B
Capacitance, Switch Off
6
C
ON
I
A
/I
B
Capacitance, Switch On
24
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
= 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 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.
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.)
PI5C3253
Dual 4:1 Mux/DeMux Bus Switch
3
PS7017C 09/14/04
Power Supply Characteristics
Parameters
Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
I
CC
Quiescent Power
Supply Current
V
CC
= Max.
V
IN
= GND
or V
CC
0.1
3.0
A
I
CC
Supply Current per
Input @ TTL HIGH
V
CC
= Max.
V
IN
= 3.4V
(3)
2.5
mA
I
CCD
Supply Current per
Input per MHz
(4)
V
CC
= Max.,
I and Y Pins Open
BE = GND
Control Input Toggling
50% Duty Cycle
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, +25C 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.
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.
Switching Characteristics over Operating Range
Param-
eters
Description
Conditions
(1)
Com.
Units
Min.
Max.
t
IY
Propagation Delay
(2,3)
In to Yn
C
L
= 50pF
R
L
= 500
0.25
ns
t
SY
Bus Select Time, Sn to Yn
0.5
6.6
t
PZH
t
PZL
Bus Enable Time, En to Yn
0.5
6.0
t
PHZ
t
PLZ
Bus Disable Time, En to Yn
0.5
6.0
PI5C3253
Dual 4:1 Mux/DeMux Bus Switch
4
PS7017C 09/14/04
Packaging Mechanical: 16-pin QSOP (Q)
Packaging Mechanical: 16-pin SOIC (S)
SEATING
PLANE
.050
BSC
1
16
0-8
.2914
.2992
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
7.40
7.60
.398
.413
10.10
10.50
1.27
.0926
.1043
2.35
2.64
.394
.419
10.00
10.65
.0040
.0118
0.10
0.30
.013
.020
.020
.030
0.33
0.51
0.508
0.762
.0091
.0125
0.254
0.737
.010
.029
x 45
0.23
0.32
.016
.050
0.41
1.27
.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
PI5C3253
Dual 4:1 Mux/DeMux Bus Switch
5
PS7017C 09/14/04
Packaging Mechanical: 16-pin SOIC (W)
Packaging Mechanical: 16-pin TSSOP (L)
.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
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
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