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PI3B3253
3.3V, Dual 4:1
Mux/Demux Bus Switch
Product Features
Near zero propagation delay
5 Ohm switches connect inputs to outputs
Fast Switching Speed: 5.2ns max.
Ultra Low Quiescent Power (0.2µA typical)
Ideally suited for notebook applications
Pin compatible with 74 series 253 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
IA0
EA
EB
S0
S1
IA1 IA2 IA3 IB0 IB1 IB2 IB3
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
using the companys advanced sub micron CMOS technology,
achieving industry leading performance.
The PI3B3253 is a 3.3V, Dual 4:1 Multiplexer/Demultiplexer with
Hi-Z outputs that is pinout compatible with the PI74FCT253T,
74F253, and 74ALS/AS/LS 253. Inputs can be connected to
outputs with low ON resistance (5 Ohm) with no additional ground
bounce noise or propagation delay.
Product Pin Configuration
EA 1
GND
16-Pin
Q, W, L
16
15
14
13
12
11
10
9
V
CC
EBS1 2
S0IA3 3
IB3IA2 4
IB2IA1 5
IB1IA0 6
IB0YA 7
YB8
YA YB
Truth Table
(1)
Enable Select
EA EB S1 S0 YA YB Function
HXXXHi-ZX Disable A
XHXXXHi-Z Disable B
LLLLIA0IB0 S1-0 = 0
L L L H IA1 IB1 S1-0 = 1
L L H L IA2 IB2 S1-0 = 2
Product Pin Description
Pin Name Description
IAn, IBn Data Inputs
S0-1 Select Inputs
EA, EB Enable
YA, YB Data Outputs
GND Ground
V
CC
Power
L L H H IA3 IB3 S1-0 = 3
Note: 1. H = High Voltage Level
L = Low Voltage Level
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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.
PI3B3253
3.3V, Dual 4:1 Mux/Demux Bus Switch
DC Electrical Characteristics (Over the Operating Range, T
Parameters Description Test Conditions
V
V
I
IH
I
IL
I
OZH
V
r
on
IH
IL
IK
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 ≤ I
, Y
≤ V
N
N
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 Ohm
= 40°C to +85°C, VCC =3.3V ±10%)
A
(1)
CC
CC
Min. Typ.
(2)
Max. Un i ts
±1 µA
±1 µ A
VCC = Min., VIN = 2.4V, ION = 15mA 10 17
Capacitance (T
Parameters
C
in
C
off
C
on
= 25°C, f = 1 MHz)
A
(4)
Description Test Conditions Typ. Un i ts
Input Capacitance VIN = 0V 3.0 pF
IA/IB Capacitance, Switch Off VIN = 0V 8.0 pF
IA/IB Capacitance, Switch On VIN = 0V 36.0 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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Power Supply Characteristics
Parameters Description Test Conditions
(1)
PI3B3253
3.3V, Dual 4:1 Mux/Demux Bus Switch
Min. Typ.
(2)
Max. Units
I
CC
Quiescent Power VCC = Max. VIN = GND or V
CC
0.1 3.0 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 VCC = 3.3V, +25°C ambient.
3. Per TTL driven input (control inputs only); I and Y pins do not contribute to ICC.
Switching Characteristics over Operating Range
PI3B3253
Com.
Parameters Description Conditions
t
IY
t
SY
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
In to Yn R
Bus Select Time CL = 50 pF 1 4.0 ns
Sn to Yn R
Bus Enable Time CL = 50pF 1 3.8 ns
E to Yn R
Bus Disable Time CL = 50pF 1 5.2 ns
En to Y R
(2,3)
CL = 50pF 0.25 ns
= 500Ω
L
= 500Ω
L
= 500Ω
L
= 500Ω
L
(1)
Min. Max. Units
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
traPegakcaP-niPhtdiW
Q3523B3IP)Q(POSQ-61lim-051
W3523B3IP)Q(CIOS-61lim-051
L3523B3IP)L(POSST-61lim-371
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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