PI5C3257R [ETC]
2-Input Digital Multiplexer ; 2 ，输入数字多路复用器\n
| 型号： | PI5C3257R |
| 厂家： | 
ETC |
| 描述： | 2-Input Digital Multiplexer
|
| 文件： | 总3页 (文件大小：177K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PI5C3257
Quad 2:1 Mux/Demux BusSwitch
Product Features:
ProductDescription
Near zero propagation delay
PericomSemiconductorsPI5Cseriesoflogiccircuitsareproduced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
5ohm switches connect inputs to outputs
Direct bus connection when switches are ON
ThePI5C3257isaQuad2:1multiplexer/demultiplexerwiththree-
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.
UltraLowQuiescentPower(0.2µATypical)
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-pin150milwideplasticSOIC(W)
16-pin173milwideplasticTSSOP(L)
20-pin150milwideplasticTSSOP(R)
16-Pin Product Configuration
Logic Block Diagram
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
S
IA0
IA1
YA
V
E
CC
IA
1
IB
0
IB
1
IC0
IC1
ID0
ID1
IA
0
ID0
ID1
YD
IC0
IC1
YC
16-Pin
L, Q,
S, W
IB0
IB1
YB
E
S
GND
20-Pin Product Configuration
NC
S
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
V
E
CC
IA0
IA1
YA
YA
YB
YC
YD
ID0
ID1
YD
IC0
IC1
YC
NC
20-Pin
R
TruthTable(1)
ProductPinDescription
IB0
IB1
YB
E
H
L
L
S
X
L
YA YB YC YD Function
Pin Name
IAn-IDn
S
Description
Data Inputs
Select Inputs
Enable
Hi-Z Hi-Z Hi-Z Hi-Z
IA0 IB0 IC0 ID0
IA1 IB1 IC1 ID1
Disable
S = 0
GND
NC
H
S = 1
E
YA-YD
GND
VCC
Data Outputs
Ground
Note: 1. H = HighVoltageLevel
L = LowVoltageLevel
Power
NC
No Connect
PS7018B
03/17/00
1
PI5C3257
Quad2:1Mux/DemuxBusSwitch
MaximumRatings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Storage Temperature ............................................................ 65°Cto+150°C
Ambient Temperature with Power Applied ............................ 40°Cto+85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ...... 0.5Vto+7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ... 0.5Vto+7.0V
DC Input Voltage .................................................................... 0.5Vto+7.0V
DC Output Current .............................................................................. 120mA
Power Dissipation .................................................................................. 0.5W
Stresses greater than those listed under MAXIMUM
RATINGSmaycausepermanentdamagetothedevice.
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 specifica-
tion is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reli-
ability.
DCElectricalCharacteristics(OvertheOperatingRange, T = 40°Cto+85°C, VCC =5V±5%)
A
Parameters Description
TestConditions(1)
Min.
2.0
Typ(2) Max.
Units
V
VIH
VIL
IIH
InputHIGHVoltage
GuaranteedLogicHIGHLevel
GuaranteedLogicLOWLevel
VCC =Max.,VIN =VCC
VCC =Max.,VIN =GND
0≤I, Y≤VCC
Input LOW Voltage
0.5
0.8
±1
±1
±1
V
InputHIGHCurrent
µA
µA
µA
IIL
Input LOW Current
IOZH
VIK
IOS
VH
High Impedance Output Current
ClampDiodeVoltage
Short Circuit Current(3)
Input Hysteresis at Control Pins
Switch On Resistance(4)
VCC = Min., IIN =18mA
I(Y)=0V,Y(I)=VCC
0.7
100
1.2
150
V
mA
mV
RON
VCC =Min.,VIN =0.0V, ION =48mA
VCC =Min.,VIN =2.4V, ION =15mA
5
7
ohm
10
15
Capacitance(T =25°C,f=1MHz)
A
Parameters(5)
Description
TestConditions
Typ
Max.
Units
CIN
Input Capacitance
VIN=0V
VIN=0V
6
6
pF
pF
COFF
In/YnCapacitance,SwitchOff
CON
In/Yn Capacitance, Switch On
VIN=0V
14
pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. TypicalvaluesareatV =5.0V,T =25°Cambientandmaximumloading.
CC
A
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.
PS7018B
03/17/00
2
PI5C3257
Quad2:1Mux/DemuxBusSwitch
PowerSupplyCharacteristics
Parameters Description
TestConditions(1)
Min. Typ(2) Max.
Units
ICC
Quiescent Power
Supply Current
VCC=Max.
VCC =Max.
VCC =Max.,
VIN =GNDorVCC
0.1
3.0
µA
DICC
ICCD
Supply Current per
Input@TTLHIGH
VIN =3.4V(3)
2.5
mA
Supply Current per
Input per MHz(4)
0.25
mA/
MHz
I and Y Pins Open
BE=GND
Control Input Toggling
50%DutyCycle
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. TypicalvaluesareatV =5.0V,+25°Cambient.
CC
3. Per TTL driven input (V = 3.4V, control inputs only); I and Y pins do not contribute to I
.
IN
CC
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.
SwitchingCharacteristicsoverOperatingRange
PI5C3257
Com.
Parameters Description
Conditions(1)
Min.
Max.
Units
tIY
Propagation Delay(2,3)
CL = 50 pF
0.25
In to Yn
RL =500ohm
tSY
BusSelectTime
Sn to Yn
BusDisableTime
E to Yn
0.5
0.5
5.2
4.8
ns
tPZH
tPZL
tPHZ
BusDisableTime
E to Yn
0.5
5.0
tPLZ
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
2380BeringDrive SanJose,CA951311-800-435-2336 Fax(408)435-1100 http://www.pericom.com
PS7018B
03/17/00
3
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