1
PS7013F 09/13/04
4-Bit Bus Switch
with Individual Enables
Description
Pericom Semiconductor's PI5C3125 and PI5C3126 are 4-bit Bus
Switches designed with four individual 5 bus switches with fast
indiviual enables in an industry standard 74XX125/126 pinout.
When enabled via the associated Bus Enable (BE) pin, the "A" pin
is directly connected to the "B" pin for that particular gate. The
bus switch introduces no additional propagation delay or additional
ground bounce noise.
The PI5C3125 device has active LOW enables, and the PI5C3126
has active HIGH enables.
Features
Near-Zero propagation delay
5 switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.1A Typical)
Ideally suited for notebook applications
Packaging (Pb-free & Green available):
14-pin 150-mil wide plastic SOIC (W)
14-pin 173-mil wide plastic TSSOP (L)
16-pin 150-mil wide plastic QSOP (Q)
PI5C3125 Block Diagram
PI5C3126 Block Diagram
PI5C3125
PI5C3126
BE0
A0
B0
BE1
A1
B1
BE2
A2
B2
BE3
A3
B3
BE0
A0
B0
BE1
A1
B1
BE2
A2
B2
BE3
A3
B3
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
2
PS7013F 09/13/04
PI5C3125 14-Pin Configuration
PI5C3126 14-Pin Configuration
PI5C3125 16-Pin Configuration
PI5C3126 16-Pin Configuration
Pin Description
Pin Name
Description
BEn
Switch Enable (PI5C3125)
BEn
Switch Enable (PI5C3126)
A3-A0
Bus A
B3-B0
Bus B
V
CC
Power
GND
Ground
Truth Table
(1)
PI5C3125
BEn
PI5C3126
BEn
An
Bn
V
CC
Function
X
(2)
X
Hi-Z Hi-Z GND Disconnect
H
L
Hi-Z Hi-Z
V
CC
Disconnect
L
H
Bn
An
V
CC
Connect
Notes:
1. H = High Voltage Level, L = Low Voltage Level,
HI-Z = High Impedance, X = Don't Care
2. A pull-up resistor should be provided for power-up protection.
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 specifica-
tion 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.)
14-Pin
L,W
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Vcc
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Vcc
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
14-Pin
W, L
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
16-Pin
Q
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
16-Pin
Q
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
3
PS7013F 09/13/04
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 10%)
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 A, B 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)
A (B) = 0 V, B (A) = 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
V
CC
= 4V, V
IN
= 2.4V,
I
ON
= 15mA
16
22
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.,
A and B Pins Open
BEn/BEn = 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); 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.
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
A/B Capacitance, Switch Off
6
C
ON
A/B Capacitance, Switch On
8
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 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.
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
4
PS7013F 09/13/04
0.193
0.201
0.047
0.002
0.006
SEATING
PLANE
0.0256
typical
0.018
0.030
0.004
0.008
0.240
0.264
1
14
0.169
0.177
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.05
0.15
6.1
6.7
0.45
0.75
0.09
0.20
4.3
4.5
1.20
max.
4.90
5.10
0.65
0.19
0.30
0.007
0.012
Switching Characteristics over Operating Range
Parameters
Description
Conditions
(1)
Com.
Units
Min.
Max.
t
PLH
t
PHL
Propagation Delay
(2,3)
A to B, B to A
C
L
= 50pF
R
L
= 500
0.25
ns
t
PZH
t
PZL
Bus Enable Time
0.5
5.4
0.5
4.7
t
PLZ
t
PHZ
Bus Disable Time
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 0.25ns 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.
Packaging Mechanical: 14-Pin TSSOP (L)
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
5
PS7013F 09/13/04
.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
14
x 45
0-8
.149
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.78
3.99
.336
.344
8.55
8.75
.0155
.026
0.393
0.660
1.27
.053
.068
1.35
1.75
.2284
.2440
5.80
6.20
.013
.020
0.330
0.508
.0040
.0098
0.10
0.25
.0099
.0196
0.25
0.50
.0075
.0098
0.19
0.25
.016
.050
0.41
1.27
REF
Packaging Mechanical: 14-Pin SOIC (W)
Packaging Mechanical: 16-Pin QSOP (Q)
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