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PI3B3251
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V
CC
I
3
1
I
4
I
2
2
I
5
I
1
3
I
6
I
0
4
I
7
Y 5
16
S
0
NC 6
15
S
1
E 7
14
S
2
8
13
12
GND
11
10
9
3.3V, 8:1 Mux/Demux BusSwitch
Product Features
• Near zero propagation delay
• 5 Ohm switches connect inputs to outputs
• Ultra Low Quiescent Power (0.1µA Typical)
– Ideally suited for notebook applications
• Pin compatible with 74 series 251 logic devices
• Packages available:
– 16-pin 150 mil wide plastic QSOP (Q)
– 16-pin 150 mil wide plastic SOIC (W)
– 16-pin 173 mil wide plastic TSSOP (L)
Logic Block Diagram
I0
E
S0
I1 I2 I3 I4 I5 I6 I7
Product Description
Pericom Semiconductor’s PI3B series of logic circuits are produced
using the Company’s advanced sub micron CMOS technology,
achieving industry leading performance.
The PI3B3251 is a 3.3V Dual 8:1 Multiplexer/demultiplexer with threestate outputs that is pinout compatible with the PI74FCT251T,
74F251, and 74ALS/AS/LS 251. Inputs can be connected to outputs
with low on resistance (5 Ohm) with no additional ground bounce
noise or propagation delay.
Product Pin Configuration
16-Pin
Q, W, L
S1
S2
Product Pin Description
Y
Truth Table
ES2 S1 S0 Y Function
HXXX Hi-Z Disable
LLLL I0 S2-0 = 0
L L L H I1 S2-0 = 1
L L H L I2 S2-0 = 2
L L H H I3 S2-0 = 3
L H L L I4 S2-0 = 4
L H L H I5 S2-0 = 5
L H H L I6 S2-0 = 6
L H H H I7 S2-0 = 7
(1)
Select
Note:
1. H = High Voltage Level
L = Low Voltage Level
1
Pin Name Description
I0–7 Data Inputs
S0–2 Select Inputs
E Enable
Y Data Outputs
GND Ground
VCC Power
PS8150D 05/15/01
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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 & VCC Only) ............... –0.5V to +4.6V
Supply Voltage to Ground Potential (Outputs & D/O Only ............. –0.5V to +4.6V
DC Input Voltage .............................................................................. –0.5V to +4.6V
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 conditions for
extended periods may affect reliability.
PI3B3251
3.3V, 8:1 Mux/Demux BusSwitch
DC Electrical Characteristics (Over the Operating Range, T
Parameters Description Test Conditions
V
V
I
I
I
V
R
IH
IL
IH
IL
OZH
IK
ON
Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V
Input LOW Voltage Guaranteed Logic LOW Level –0.5 0.8 V
Input HIGH Current VCC = Max., VIN = V
Input LOW Current VCC = Max., VIN = GND ±1 µA
High Impedance Output Current 0 ≤ IN, YN ≤ V
Clamp Diode Voltage VCC = Min., IIN = –18mA –1.2 V
Switch On Resistance
(3)
VCC = Min., VIN = 0.0V, ION = 48mA or 64mA 5 8 Ω
= –40°C to +85°C, VCC =3.3V ±10%)
A
(1)
CC
CC
Min. Typ
(2)
Max. Units
±1 µA
±1 µA
VCC = Min., VIN = 2.4V, ION = 15mA 10 17
Capacitance (T
Parameters
C
IN
C
I(OFF)
C
Y
(OFF)
C
I
(ON)
= 25°C, f = 1 MHz)
A
(5)
Description Test Conditions Typ. Units
Input Capacitance VIN = 0V 3.0 pF
I0 - I7 Capacitance, Switch Off VIN = 0V 8.0 pF
Y Capacitance, Switch Off VIN = 0 V 64.0 pF
I0 - I7 Capacitance, Switch On VIN = 0 V 72.0 pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 3.3V, TA = 25°C ambient and maximum loading.
3. 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.
4. This parameter is determined by device characterization but is not production tested.
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PS8150D 05/15/01
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Power Supply Characteristics
Parameters Description Test Conditions
(1)
PI3B3251
3.3V, 8:1 Mux/Demux BusSwitch
Min. Typ.
(2)
Max. Units
I
CC
Quiescent Power VCC = Max. VIN = GND or VCC 0.1 3 µA
Supply Current
∆∆
∆I
∆∆
CC
Supply Current per VCC = Max. VIN = 3.0V
(3)
Input @ TTL HIGH
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
3. Per TTL driven input (control input only); I and Y pins do not contribute to I
= 3.3V, +25°C ambient.
CC
CC
.
Switching Characteristics over Operating Range
PI3B3251
Com.
Parameters Description Conditions
t
PD
Propagation Delay
(2,3)
CL = 50pF 0.25
In to Y RL = 500Ω
t
SY
Bus Enable Time CL = 50pF RL = 500Ω 1 4.5
Sn to Y
t
t
t
t
PZH
PZL
PHZ
PLZ
Bus Enable Time CL = 50pF RL = 500Ω 1 3.5
E to Y
Bus Disable Time CL = 50pF RL = 500Ω 1 5.5
E to Y
(1)
Min. Max. Units
ns
750 µA
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.
Ordering Information
rebmuNtraPegakcaP/niPerutarepmeT
Q1523B3IP)Q(POSQ-61C°58+otC°04–
W1523B3IP)W(CIOS-61C°58+otC°04–
L1523B3IP)L(POSST-61C°58+otC°04–
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
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PS8150D 05/15/01
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