PI5C3251
8:1 Mux/DeMux BusSwitch
1
2
3
4
5
Features:
• Near-Zero propagation delay
• 5Ω switches connect inputs to outputs
• Direct bus connection when switches are ON
•
Ultra Low Quiescent Power (0.2 µA Typical)
– Ideally suited for notebook applications
Description:
Pericom Semiconductor’s PI5C3251 is a Dual 8:1 Multiplexer/
demultiplexer with three-state outputs that is pinout compatible
with the PI74FCT251T, 74F251, and 74ALS/AS/LS 251. Inputs
can be connected to outputs with low on resistance (5Ω) with no
additional ground bounce noise or propagation delay.
• Pin compatible with 74 series 251 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
I0
I1
I2
I3
I4
I5
I6
I7
Pin Configuration
I3
I2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCC
I4
I5
I6
I7
S0
S1
S2
6
7
8
9
E
S0
S1
S2
I1
I0
Y
NC
E
Y
GND
10
Truth Table
(1)
E
H
L
L
L
L
L
L
L
L
Select
S
2
S
1
X
X
L
L
L
L
L
H
L
H
H
L
H
L
H
H
H
H
S
0
X
L
H
L
H
L
H
L
H
Y
Hi-Z
I0
I1
I2
I3
I4
I5
I6
I7
Function
Disable
S2-0 = 0
S2-0 = 1
S2-0 = 2
S2-0 = 3
S2-0 = 4
S2-0 = 5
S2-0 = 6
S2-0 = 7
Pin Description
Pin Name
I
0
–
7
S
0
–
2
E
Y
GND
V
CC
Data Inputs
Select Inputs
Enable
Data Outputs
Ground
Power
Description
11
12
13
14
15
Note:
1.
H = High Voltage Level, L = Low Voltage Level
1
PS7016B
09/14/04
PI5C3251
8:1 Mux/DeMux BusSwitch
Maximum Ratings
(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.....................................................................................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
= –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
= 48 mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15 mA
Test Conditions
(1)
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
150
5
10
7
15
–0.7
Min.
2.0
–0.5
0.8
±1
±1
±1
–1.2
V
mA
mV
Ω
µA
Typ
(2)
Max.
Units
V
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(5)
Description
Input Capacitance
I
0
- I
7
Capacitance, Switch Off
Y Capacitance, Switch Off
I
0
- I
7
Capacitance, Switch On
V
IN
= 0V
35
Test Conditions
Typ.
Max.
6
6
48
54
pF
Units
C
IN
C
I(OFF)
C
Y(OFF)
C
I(ON)
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.
5. This parameter is determined by device characterization but is not production tested.
2
PS7016B
09/14/04
PI5C3251
8:1 Mux/DeMux BusSwitch
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
Description
Quiescent Power Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
V
CC
=
Max.
V
CC
= Max.
V
CC
= Max.,
I and Y Pins Open
E
= GND
Control Input Toggling
50% Duty Cycle
Test Conditions
(1)
V
IN
= GND
or
V
CC
V
IN
= 3.4V
(3)
Min. Typ
(2)
0.1
Max. Units
3.0
2.5
µA
mA
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 Vcc = 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 Icc.
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
(2,3)
In to Y
Bus Select Time
Sn to Y
Bus Enable Time
E to Y
Bus Disable Time
E to Y
C
L
= 50
pF
R
L
= 500Ω
0.5
0.5
0.5
Conditions
(1)
Com.
Min.
Max.
0.25
6.6
ns
6.0
6.0
Unit
Notes:
1. See test circuit and wave forms.
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 0.25 ns for 50 pF 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.
3
PS7016B
09/14/04
PI5C3251
8:1 Mux/DeMux BusSwitch
Packaging Mechanical: 16-pin QSOP (Q)
16
.008
0.20
MIN.
.150
.157
3.81
3.99
.008
.013
0.20
0.33
Guage Plane
.010
0.254
1
.189
.197
4.80
5.00
Detail A
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.015 x 45°
0.38
.008
0.203
REF
.053
1.35
.069
1.75
Detail A
.007
.010
0.178
0.254
SEATING
PLANE
.004
0.101
.010
0.254
0.41
.016
1.27
.050
.025
BSC
0.635
.008
.012
0.203
0.305
.228
.244
5.79
6.19
X.XX
DENOTES DIMENSIONS IN MILLIMETERS
X.XX
Packaging Mechanical: 16-pin SOIC (S)
16
.2914
.2992
7.40
7.60
.010
0.254
x 45˚
.029
0.737
1
.398 10.10
.413 10.50
.020
0.508
.030
0.762
0-8˚
.0926
2.35
.1043
2.64
SEATING
PLANE
.0091
0.23
.0125
0.32
0.41
.016
1.27
.050
.394
.419
10.00
10.65
.050
BSC
1.27
.013
.020
0.33
0.51
.0040
.0118
0.10
0.30
X.XX
DENOTES DIMENSIONS
X.XX
IN MILLIMETERS
4
PS7016B
09/14/04
PI5C3251
8:1 Mux/DeMux BusSwitch
Packaging Mechanical: 16-pin SOIC (W)
16
.149
.157
3.78
3.99
.0099
.0196
0.25
x 45˚
0.50
1
.386
.393
9.80
10.00
.0155
.0260
0.393
0.660
REF
0-8˚
0.41
1.27
.016
.050
.0075
.0098
0.19
0.25
.053
.068
1.35
1.75
SEATING PLANE
.2284
.2440
5.80
6.20
.050
BSC
1.27
.013
.020
0.330
0.508
.0040
0.10
.0098
0.25
X.XX
DENOTES DIMENSIONS
X.XX
IN MILLIMETERS
Packaging Mechanical: 16-pin TSSOP (L)
16
.169
.177
4.3
4.5
1
.193
.201
4.9
5.1
.004
.008
.047
max.
1.20
0.09
0.20
0.45
.018
0.75
.030
SEATING
PLANE
.252
BSC
6.4
.0256
BSC
0.65
.007
.012
0.19
0.30
.002
.006
0.05
0.15
X.XX
DENOTES CONTROLLING
X.XX
DIMENSIONS IN MILLIMETERS
5
PS7016B
09/14/04
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