ETC PI3B3251IW

PI3B3251
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3.3V, 8:1 Mux/Demux BusSwitch
Product Features
Product Description
• 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)
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
Logic Block Diagram
I0
I1
I2
I3
I4
I5
I6
I7
E
S0
S1
I3
1
I2
2
I1
I0
3
4
Y
5
NC
E
GND
6
7
8
16
VCC
15
I4
16-Pin
Q, W, L 14
13
12
11
10
9
I5
I6
I7
S0
S1
S2
S2
Product Pin Description
Pin Name
I0–7
S 0 –2
E
Y
GND
VCC
Y
Truth Table(1)
E
H
L
L
L
L
L
L
L
L
S2
X
L
L
L
L
H
H
H
H
Select
S1
X
L
L
H
H
L
L
H
H
S0
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
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Description
Data Inputs
Select Inputs
Enable
Data Outputs
Ground
Power
Note:
1. H = High Voltage Level
L = Low Voltage Level
1
PS8150D
01/05/00
PI3B3251
3.3V, 8:1 Mux/Demux BusSwitch
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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.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC =3.3V ±10%)
Parameters Description
Test Conditions(1)
Min.
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
–0.5
IIH
Input HIGH Current
IIL
Input LOW Current
IOZH
High Impedance Output Current 0 ≤ IN, YN ≤ VCC
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
RON
Switch On Resistance(3)
VCC = Min., VIN = 0.0V, ION = 48mA or 64mA
VCC = Min., VIN = 2.4V, ION = 15mA
Typ(2)
Max.
Units
V
0.8
V
VCC = Max., VIN = VCC
±1
µA
VCC = Max., VIN = GND
±1
µA
±1
µA
–1.2
V
8
17
Ω
5
10
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
CIN
CI (OFF)
CY(OFF)
CI(ON)
Description
Test Conditions
Typ.
Units
Input Capacitance
I0 - I7 Capacitance, Switch Off
Y Capacitance, Switch Off
I0 - I7 Capacitance, Switch On
VIN = 0V
VIN = 0V
VIN = 0V
VIN = 0V
3.0
8.0
64.0
72.0
pF
pF
pF
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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2
PS8150D
01/05/00
PI3B3251
3.3V,
8:1
Mux/Demux
BusSwitch
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Power Supply Characteristics
Test Conditions(1)
Parameters Description
Min.
ICC
Quiescent Power
Supply Current
VCC = Max.
VIN = GND or VCC
∆ICC
Supply Current per
Input @ TTL HIGH
VCC = Max.
VIN = 3.0V(3)
Typ.(2) Max.
0.1
Units
3
µA
750
µA
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 3.3V, +25°C ambient.
3. Per TTL driven input (control input only); I and Y pins do not contribute to ICC.
Switching Characteristics over Operating Range
Parameters Description
tPD
tSY
tPZH
tPZL
tPHZ
tPLZ
Propagation Delay(2,3)
In to Y
Bus Enable Time
Sn to Y
Bus Enable Time
E to Y
Bus Disable Time
E to Y
PI3B3251
Com.
Min.
Max.
Conditions(1)
CL = 50pF
RL = 500Ω
CL = 50pF RL = 500Ω
1
4.5
CL = 50pF RL = 500Ω
1
3.5
CL = 50pF RL = 500Ω
1
5.5
Units
0.25
ns
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
Part Numbe r
Pin / Package
Te mpe rature
PI3B3251Q
16- Q SO P (Q )
–40°C to +85°C
PI3B3251W
16- SSO P (W)
–40°C to +85°C
PI3B3251L
16- TSSO P (L)
–40°C to +85°C
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
3
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PS8150D
01/05/00