ETC PI5C3257

PI5C3257
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Quad 2:1 Mux/Demux BusSwitch
Product Features:
Product Description
• Near zero propagation delay
• 5ohm 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
• Packages 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)
– 20-pin 150 mil wide plastic TSSOP (R)
Pericom Semiconductor’s PI5C series of logic circuits are produced
using the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
The PI5C3257 is a Quad 2:1 multiplexer/demultiplexer with threestate 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.
16-Pin Product Configuration
Logic Block Diagram
IA1
IA0
IB0
IB1
IC0
IC1
ID0
ID1
E
S
1
16
VCC
IA0
2
15
E
IA1
3
14
ID0
YA
4
IB0
5
16-Pin
L, Q, 13
S, W
12
YD
IB1
6
11
IC0
YB
7
10
IC1
GND
8
9
YC
ID1
20-Pin Product Configuration
YA
YB
S
X
L
H
YA
Hi-Z
IA0
IA1
YC
YD
Product Pin Description
Truth Table(1)
E
H
L
L
S
YB
Hi-Z
IB0
IB1
YC
Hi-Z
IC0
IC1
YD
Hi-Z
ID0
ID1
Note: 1. H = High Voltage Level
L = Low Voltage Level
Function
Disable
S=0
S=1
Pin Name
IAn-IDn
S
E
YA-YD
GND
VCC
NC
1
Description
Data Inputs
Select Inputs
Enable
Data Outputs
Ground
Power
No Connect
NC
1
20
NC
S
2
19
VCC
IA0
3
18
E
IA1
4
17
ID0
YA
5
20-Pin
16
R
IB0
6
15
YD
IB1
7
14
IC0
YB
8
13
IC1
GND
9
12
YC
10
11
NC
NC
ID1
PS7018B
03/17/00
PI5C3257
Quad
2:1
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 +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
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 = 5V ±5%)
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
Typ(2)
Max.
Units
V
0.8
V
VCC = Max., VIN = VCC
±1
µA
Input LOW Current
VCC = Max., VIN = GND
±1
µA
IOZH
High Impedance Output Current
0 ≤ I, Y ≤ VCC
±1
µA
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18 mA
–0.7
IOS
Short Circuit Current
I (Y) = 0V, Y (I) = VCC
100
VH
Input Hysteresis at Control Pins
RON
Switch On Resistance
(3)
(4)
–1.2
V
mA
150
VCC = Min., VIN = 0.0V,
VCC = Min., VIN = 2.4V,
ION = 48mA
ION = 15mA
mV
5
10
7
15
ohm
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
Test Conditions
CIN
COFF
Input Capacitance
In/Yn Capacitance, Switch Off
CON
In/Yn Capacitance, Switch On
Typ
Max.
Units
VIN = 0V
VIN = 0V
6
6
pF
pF
VIN = 0V
14
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 = 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.
5. This parameter is determined by device characterization but is not production tested.
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PS7018B
03/17/00
PI5C3257
Quad
2:1
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
DICC
Supply Current per
Input @ TTL HIGH
VCC = Max.
VIN = 3.4V(3)
ICCD
Supply Current per
Input per MHz(4)
VCC = Max.,
I and Y Pins Open
BE = GND
Control Input Toggling
50% Duty Cycle
Typ(2)
Max.
Units
0.1
3.0
µA
2.5
mA
0.25
mA/
MHz
Notes:
1. For Max. or Min. conditions, use appropriate value specified 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 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
Parameters Description
tIY
tSY
tPZH
tPZL
tPHZ
tPLZ
Propagation Delay(2,3)
In to Yn
Bus Select Time
Sn to Yn
Bus Disable Time
E to Yn
Bus Disable Time
E to Yn
Conditions(1)
CL = 50 pF
RL = 500ohm
PI5C3257
Com.
Min.
Max.
Units
0.25
0.5
5.2
0.5
4.8
0.5
5.0
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.
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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PS7018B
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