PI5C3257QX [PERICOM]
Bus Exchanger, CBT/FST/QS/5C/B Series, 4-Func, 1-Bit, True Output, CMOS, PDSO16, 0.150 INCH, PLASTIC, QSOP-16;
| 型号： | PI5C3257QX |
| 厂家： | 
PERICOM SEMICONDUCTOR CORPORATION |
| 描述： | Bus Exchanger, CBT/FST/QS/5C/B Series, 4-Func, 1-Bit, True Output, CMOS, PDSO16, 0.150 INCH, PLASTIC, QSOP-16 解复用器 |
| 文件： | 总3页 (文件大小：38K) |
| 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:
• Near zero propagation delay
ProductDescription:
Pericom Semiconductor’s PI5C series of logic circuits are pro-
duced in the Company’s advanced 0.8 micron CMOS technology,
achieving industry leading performance.
• 5Ω switches connect inputs to outputs
•
•
Direct bus connection when switches are ON
The 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
connectedtooutputswithlowonresistance(5Ω)withnoadditional
ground bounce noise or propagation delay.
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)
– 20-pin 150 mil wide plastic TSSOP (R)
16-Pin Product Configuration
Logic Block Diagram
16
15
14
13
12
11
10
9
S
1
2
3
4
5
6
7
8
V
E
CC
IA
1
IB
0
IB
1
IC0
IC1
ID0
ID1
IA
0
IA
IA
0
1
ID
0
1
16-PIN
YA
IB
IB
ID
0
YD
1
IC
0
1
E
S
YB
IC
GND
YC
20-Pin Product Configuration
20
19
18
17
16
15
14
NC
S
1
2
3
4
5
6
7
8
9
10
NC
V
CC
IA
IA
0
1
E
YA
YB
YC
YD
ID0
20-PIN
R20
ID1
YA
YD
IB
IB
0
Product Pin Description
Truth Table(1)
1
IC
0
1
E
H
L
L
S
X
L
H
YA YB YC YD Function
Pin Name
IAn-IDn
S
Description
Data Inputs
Select Inputs
Enable
13
12
11
IC
YB
GND
NC
Hi-Z Hi-Z Hi-Z Hi-Z
IA0 IB0 IC0 ID0
IA1 IB1 IC1 ID1
Disable
S = 0
YC
NC
S = 1
E
YA-YD
GND
VCC
Data Outputs
Ground
Note: 1. H = High Voltage Level
L = Low Voltage Level
Power
NC
No Connect
PS7018A 03/13/96
158
PI5C3257
QUAD2:1MUX/DEMUXBusSwitch
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ................................................................. –55°C to +125°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 ................................................................................... 120 mA
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
TestConditions(1)
Min. Typ(2) Max. Units
VIH
VIL
IIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
VCC = Max., VIN = VCC
VCC = Max., VIN =GND
0 ≤ I, Y ≤ VCC
2.0
V
V
Input LOW Voltage
–0.5
0.8
±1
Input HIGH Current
µA
µA
µA
V
IIL
Input LOW Current
±1
IOZH
VIK
IOS
High Impedance Output Current
Clamp Diode Voltage
Short Circuit Current(3)
Input Hysteresis at Control Pins
Switch On Resistance(4)
±1
VCC = Min., IIN = –18 mA
I (Y) = 0V, Y (I) = VCC
–0.7
150
–1.2
100
mA
mV
Ω
VH
RON
VCC = Min., VIN = 0.0V, ION = 48 mA
VCC = Min., VIN = 2.4V, ION = 15 mA
5
10
7
15
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
TestConditions
Typ
Max.
Units
CIN
Input Capacitance
VIN =0V
VIN =0V
6
6
pF
pF
COFF
In/Yn Capacitance, Switch Off
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. 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.
PS7018A 03/13/96
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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
∆ICC
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. TypicalvaluesareatVcc=5.0V,+25°Cambient.
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.
SwitchingCharacteristicsoverOperatingRange
PI5C3257
Com.
Parameters
Description
Conditions(1)
=50pF
=500
Min
Max
Unit
t
t
IY
PropagationDelay(2,3)
IntoYn
C
L
0.25
ns
RL
Ω
SY
BusSelectTime
SntoYn
0.5
0.5
5.2
4.8
ns
ns
t
t
PZH
PZL
BusDisableTime
EtoYn
t
t
PHZ
PLZ
BusDisableTime
EtoYn
0.5
5.0
ns
Notes:
1. See test circuit and wave forms.
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 0.25 ns for 50 pF 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,CA95131•1-800-435-2336 • Fax(408)435-1100• http://www.pericom.com
PS7018A 03/13/96
160
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