1PS7013J 07/21/10
4-Bit Bus Switch
with Individual Enables
Description
Pericom Semiconductor’s PI5C3125 and PI5C3126 are 4-bit Bus
Switches designed with four individual 5Ω 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
• 5Ω switches connect inputs to outputs
• Direct bus connection when switches are ON
• Ultra Low Quiescent Power (0.1µA typical)
– Ideally suited for notebook applications
• Packaging (Pb-free & Green available):
– 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
11-0002
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
2PS7013J 07/21/10
PI5C3125 16-Pin Conguration PI5C3126 16-Pin Conguration
Pin Description
Pin Name Description
BEn Switch Enable (PI5C3125)
BEn Switch Enable (PI5C3126)
A3-A0 Bus A
B3-B0 Bus B
VCC Power
GND Ground
Truth Table(1)
PI5C3125
BEn
PI5C3126
BEn An Bn VCC Function
X(2) XHi-Z Hi-Z GND Disconnect
H L Hi-Z Hi-Z VCC Disconnect
L H Bn An VCC 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 .................................................................. –65°C to +150°C
Ambient Temperature with Power Applied ................................. –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & VCC 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 specica-
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.)
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
11-0002
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
3PS7013J 07/21/10
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5V ± 10%)
Parameters Description Test Conditions(1) Min. Typ(2) Max. Units
VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V
VIL Input LOW Voltage Guaranteed Logic LOW Level –0.5 0.8
IIH Input HIGH Current VCC = Max., VIN = VCC ±1
µAIIL Input LOW Current VCC = Max., VIN = GND ±1
IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ±1
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA –0.7 –1.2 V
IOS Short Circuit Current(3) A (B) = 0 V, B (A) = VCC 100 mA
VHInput Hysteresis at Control Pins 150 mV
RON Switch On-Resistance(4)
VCC = Min., VIN = 0.0V, ION = 48mA 5 7
ΩVCC = Min., VIN = 2.4V, ION = 15mA 10 15
VCC = 4V, VIN = 2.4V, ION = 15mA 16 22
Power Supply Characteristics
Parameters Description Test Conditions(1) Min. Typ(2) Max. Units
ICC Quiescent Power
Supply Current VCC = Max. VIN = GND
or VCC 0.1 3.0 µA
ΔICC Supply Current per
Input @ TTL HIGH VCC = Max. VIN = 3.4V(3) 2.5 mA
ICCD Supply Current per
Input per MHz(4)
VCC = 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 specied under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V, control inputs only); A and B 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 specied frequency.
The A and B inputs generate no signicant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(1) Description Test Conditions Typ. Max. Units
CIN Input Capacitance
VIN = 0V
6
pFCOFF A/B Capacitance, Switch Off 6
CON A/B Capacitance, Switch On 8
Notes:
1. For Max. or Min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, TA = 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 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.
Notes:
1. This parameter is determined by device characterization but is not production tested.
11-0002
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
4PS7013J 07/21/10
Switching Characteristics over Operating Range
Parameters Description Conditions Com. Units
Min. Max.
tPLH
tPHL
Propagation Delay(1,2)
A to B, B to A
CL = 50pF
RL = 500Ω
0.25
ns
tPZH
tPZL Bus Enable Time 0.5 5.4
0.5 4.7tPLZ
tPHZ Bus Disable Time
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.
11-0002
PI5C3125/3126
4-Bit Bus Switch w/Individual Enables
5PS7013J 07/21/10
Packaging Mechanical: 16-Pin QSOP (Q)
1
.189
.197
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
1
16
.150
.157
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
.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
DESCRIPTION: 16-Pin 150-Mil Wide QSOP
PACKAGE CODE: Q
DOCUMENT CONTROL NO.
PD - 1201
REVISION: G
DATE: 11/07/07
Note:
1) Controlling dimensions in inches.
2) Ref: JEDEC MO-137B/AB.
3) Dimensions do not include mold flash, protrusions or gate burrs
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335 • www.pericom.com
Ordering Information
Ordering Code Package Type Package Description
PI5C3125QE Q Pb-free & Green, 16-pin QSOP
PI5C3126QE Q Pb-free & Green, 16-pin QSOP
Notes:
• Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
• E = Pb-free & Green
• Adding an X sufx = Tape/Reel
11-0002
