1PS7018G 11/04/06
Description
Pericom Semiconductor’s PI5C3257 is a 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 (5Ω)
with no additional ground bounce noise or propagation delay.
Block Diagram
PI5C3257
Quad 2:1 Mux/DeMux BusSwitch
Features:
• Near-Zero propagation delay
• 5Ω switches connect inputs to outputs
• Direct bus connection when switches are ON
• Ultra Low Quiescent Power (0.2µA typical)
– Ideally suited for notebook applications
• Pin compatible with 74 series 257 logic devices
• Packaging (Pb-free & Green available):
– 16-pin 150-mil wide plastic QSOP (Q)
– 16-pin 300-mil wide plastic SOIC (S)
– 16-pin 150-mil wide plastic SOIC (W)
– 16-pin 173-mil wide plasticTSSOP (L)
Pin Conguration
Truth Table(1)
E S YA YB YC YD Function
H X Hi-Z Hi-Z Hi-Z Hi-Z Disable
L L IA0 IB0 IC0 ID0 S = 0
L H IA1 IB1 IC1 ID1 S = 1
Note:
1. H = High Voltage Level, L = Low Voltage Level
E
IA0 IA1 IB0 IB1 IC0 IC1 ID0 ID1
S
YA YB YC YD
VCC
S1
E
IA0 2
ID0
IA1 3
ID1
YA 4
YD
IB0 5
16
IC0
IB1 6
15
IC1
YB 7
14
YC8
13
12
GND
11
10
9
Pin Description
Pin Name Description
IAn-IDn Data Inputs
S Select Inputs
E Enable
YA-YD Data Outputs
GND Ground
VCC Power
06-0240
PI5C3257
Quad 2:1 Mux/DeMux BusSwitch
2PS7018G 11/04/06
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 RAT-
INGS 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 specication is not implied. Ex-
posure to absolute maximum rating conditions for extended
periods may affect reliability.
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(1) Description Test Conditions Typ Max. Units
CIN Input Capacitance
VIN = 0V
6
pFCOFF In/Yn Capacitance, Switch Off 6
CON In/Yn Capacitance, Switch On 14
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5V ±5%)
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 ≤ I, Y ≤ VCC ±1
VIK Clamp Diode Voltage VCC = Min., IIN = –18 mA –0.7 –1.2 V
IOS Short Circuit Current(3) I (Y) = 0V, Y (I) = VCC 100 mA
VHInput Hysteresis at Control Pins 150 mV
RON Switch On-Resistance(4) VCC = Min., VIN = 0.0V, ION = 48mA 5 7 Ω
VCC = Min., VIN = 2.4V, ION = 15mA 10 15
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 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.
Notes:
1. This parameter is determined by device characterization but is not production tested.
06-0240
PI5C3257
Quad 2:1 Mux/DeMux BusSwitch
3PS7018G 11/04/06
Switching Characteristics over Operating Range
Parameters Description Conditions Com. Units
Min. Max.
tIY Propagation Delay(1,2)
In to Yn
CL = 50pF
RL = 500Ω
0.25
ns
tSY Bus Select Time
Sn to Yn 0.5 5.2
tPZH
tPZL
Bus Enable Time
E to Yn 0.5 4.8
tPHZ
tPLZ
Bus Disable Time
E to Yn 0.5 5.0
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
∆ICC 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.,
I and Y Pins Open
BE = 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); 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 specied frequency. The I
and Y inputs generate no signicant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.
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.
06-0240
PI5C3257
Quad 2:1 Mux/DeMux BusSwitch
4PS7018G 11/04/06
Packaging Mechanical: 16-pin QSOP (Q)
Packaging Mechanical: 16-pin SOIC (S)
.189
.197
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
1
16
.150
.157
.016
.050
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
0.41
1.27
.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
SEATING
PLANE
.050
BSC
1
16
0-8˚
.2914
.2992
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
7.40
7.60
.398
.413
10.10
10.50
1.27
.0926
.1043
2.35
2.64
.394
.419
10.00
10.65
.0040
.0118
0.10
0.30
.013
.020
.020
.030
0.33
0.51
0.508
0.762
.0091
.0125
0.254
0.737
.010
.029
x 45˚
0.23
0.32
.016
.050
0.41
1.27
06-0240
PI5C3257
Quad 2:1 Mux/DeMux BusSwitch
5PS7018G 11/04/06
Packaging Mechanical:16-pin SOIC (W)
Packaging Mechanical: 16-pin TSSOP (L)
SEATING PLANE
.050
BSC
1
16
0-8˚
.149
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.78
3.99
.386
.393
9.80
10.00
1.27
.053
.068
1.35
1.75 .2284
.2440
5.80
6.20
.0040
.0098
0.10
0.25
.013
.020
.0155
.0260
0.330
0.508
0.393
0.660
.0075
.0098
0.25
0.50
.0099
.0196 x 45˚
0.19
0.25
.016
.050
0.41
1.27
REF
.193
.201
.047
max.
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
16
.169
.177
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
1.20
4.9
5.1
0.65
0.19
0.30
.007
.012
06-0240
PI5C3257
Quad 2:1 Mux/DeMux BusSwitch
6PS7018G 11/04/06
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
Ordering Information
Ordering Code Packaging Code Package Description
PI5C3257Q Q 16-pin 150 mil wide plastic QSOP
PI5C3257QE Q Pb-free & Green, 16-pin 150-mil wide plastic QSOP
PI5C3257S S 16-pin 300-mil wide plastic SOIC
PI5C3257SE S Pb-free & Green, 116-pin 300-mil wide plastic SOIC
PI5C3257W W 16-pin 150-mil wide plastic SOIC
PI5C3257WE W Pb-free & Green, 16-pin 150-mil wide plastic SOIC
PI5C3257L L 16-pin 173-mil wide plastic TSSOP
PI5C3257LE L Pb-free & Green, 16-pin 173-mil wide plastic TSSOP
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
06-0240
