PERICOM PI3B3257W

PI3B3257
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3.3V, Quad 2:1
Mux/Demux Bus Switch
Product Features
Product Description
• Near zero propagation delay
• 5-ohm switches connect inputs to outputs
• Fast Switching Speed: 4.8ns max.
• Ultra-Low Quiescent Power: 0.1µA typical
– Ideally suited for notebook applications
• Pin compatible with 74 series 257 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 submicron CMOS technology,
achieving industry leading performance.
Logic Block Diagram
16-Pin Product Configuration
IA1
IA0
IB0
IB1
IC0
IC1
The PI3B3257 is a 3.3 Volt, Quad 2:1 multiplexer/demultiplexer with
three-state outputs that is pinout and function compatible with the
PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be
connected to outputs with low ON resistance (5 ohms) with no
additional ground bounce noise or propagation delay.
ID0
ID1
S
1
16
VCC
IA0
2
15
E
IA1
3
ID0
YA
4
IB0
5
14
16-Pin
13
Q, W, L
12
IB1
6
11
IC0
YB
7
10
IC1
GND
8
9
YC
E
ID1
YD
S
Product Pin Description
YA
YB
YC
YD
Truth Table(1)
Pin Name
De s cription
IAn- IDn
Data Inputs
S
Select Inputs
E
Enable
E
S
YA
YB
YC
YD
Function
YA- YD
Data Outputs
H
X
Hi- Z
Hi- Z
Hi- Z
Hi- Z
Disable
GND
Ground
L
L
IA0
IB0
IC0
ID0
S=0
Vcc
Power
L
H
IA1
IB1
IC1
ID1
S=1
NC
No Connect
Note: 1. H = High Voltage Level
L = Low Voltage Level
1
PS8151F
05/07/01
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
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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 ................................................. –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%)
Parame te rs
Te s t Conditions (1)
De s cription
M in.
Typ.(2)
M ax.
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
–0.5
IIH
Input HIGH Current
VCC = Max., VIN = VCC
±1
IIL
Input LOW Current
VCC = Max., VIN = GND
±1
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
0.8
Units
V
µA
±1
5
10
–1.2
V
8
17
Ω
Capacitance (TA = 25°C, f = 1 MHz)
Parame te rs
Te s t Conditions
Typical
Input Capacitance
VIN =0V
3.0
COFFYN
YN Capacitance, Switch O ff
VIN =0V
17.0
COFFIN
IN Capacitance, Switch O ff
VIN =0V
8.5
IN/YN Capacitance, Switch O n
VIN =0V
25.0
CIN
CON
D e s cription
Units
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.
2
PS8151F
05/07/01
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
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Power Supply Characteristics
Parame te rs
Te s t Conditions (1)
De s cription
ICC
Quiescent Power Supply Current
VCC = Max. VIN = GND or VCC
∆ICC
Supply Current per Input @ TTL HIGH(3,4)
VCC = Max. VIN = 3.0V
M in.
Typ(2)
M ax.
0.1
3.0
750
Units
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 inputs only); I and Y 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 specified
frequency. The I and Y inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is
guaranteed by design.
Switching Characteristics over Operating Range
PI3B3257
Parame te rs
Conditions (1)
D e s cription
Com.
M in.
(2,3)
tIY
Propagation Delay In to Yn
tSY
Bus Select Time, Sn to Yn
tPZH
tPZL
Bus Enable Time, E to Yn
tPHZ
tPLZ
Bus Disable Time, E to Yn
Units
M ax.
0.25
CL = 50pF
RL = 500Ω
1
4.5
1
4.5
1
4.8
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 switch’s time constant 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.
3
PS8151F
05/07/01
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
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16-Pin QSOP (Q) Package
16
.008
0.20
MIN.
.150
.157
.008
.013
0.20
0.33
3.81
3.99
Guage Plane
.010
0.254
Detail A
1
.041
1.04
REF
.189
.197
4.80
5.00
.015 x 45° 0.38
.008
0.203 REF
.053 1.35
.069 1.75
Detail A
0.178
0.254
.228
.244
5.79
6.19
.004 0.101
.010 0.254
.008
.012
0.203
0.305
.007
.010
0.41 .016
1.27 .050
SEATING
PLANE
.025
BSC
0.635
0˚-6˚
.016
.035
0.41
0.89
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
16-Pin SOIC (W) Package
16
.149
.157
3.78
3.99
.0099
.0196
0.25
x 45˚
0.50
1
.0075
.0098
0-8˚
.386
.393
9.80
10.00
0.41
1.27
.053
.068
.0155
.0260
0.393
0.660
REF
1.35
1.75
SEATING PLANE
.050
BSC
1.27
.013
.020
0.330
0.508
0.19
0.25
.016
.050
.2284
.2440
5.80
6.20
.0040 0.10
.0098 0.25
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
4
PS8151F
05/07/01
PI3B3257
3.3V, Quad 2:1
Mux/Demux Bus Switch
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16-Pin TSSOP (L) Package
16
.169
.177
4.3
4.5
1
.193
.201
4.9
5.1
.004
.008
.047
max.
1.20
0.45 .018
0.75 .030
SEATING
PLANE
.0256
BSC
0.65
.007
.012
.002
.006
0.09
0.20
.252
BSC
6.4
0.05
0.15
X.XX DENOTES CONTROLLING
X.XX DIMENSIONS IN MILLIMETERS
0.19
0.30
Ordering Information
Part
Pin-Package
Width
PI3B3257Q
16 - Q SO P(Q )
150- mil
PI3B3257W
16 - SO IC (W)
150- mil
PI3B3257L
16 - TSSO P (L)
173- mil
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
5
PS8151F
05/07/01