PI74FCT245DTR [ETC]
Single 8-bit Bus Transceiver ; 一个8位总线收发器\n
| 型号： | PI74FCT245DTR |
| 厂家： | 
ETC |
| 描述： | Single 8-bit Bus Transceiver
|
| 文件： | 总4页 (文件大小：221K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ω
Fast CMOS Octal
Bidirectional Transceivers
ProductFeatures
ProductDescription
PI74FCT245/640/645TandPI74FCT2245/2640T/2645Tarepin
compatible with bipolar FAST Series at a higher speed and
lower power consumption
25 Ohm series resistor on all outputs (FCT2XXX only)
TTL input and output levels
Pericom Semiconductors PI74FCT series of logic circuits are
produced using the Companys advanced 0.6/0.8 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXXdeviceshaveabuilt-in25Ohmseriesresistoronall
outputs to reduce noise because of reflections, thus eliminating the
need for an external terminating resistor.
Low ground bounce outputs
Extremelylowstaticpower
Hysteresis on all inputs
Industrial operating temperature range: 40°C to +85°C
Packagesavailable:
20-pin173milwideplasticTSSOP(L)
20-pin300milwideplasticDIP(P)
20-pin150milwideplasticQSOP(Q)
20-pin150milwideplasticTQSOP(R)
20-pin300milwideplasticSOIC(S)
20-pin209milwideplasticSSOP(H)
Device models available on request
ThePI74FCT245T/640T/645TandPI74FCT2245T/2640T/2645Tare
8-bit wide octal buffer bidirectional transceivers designed for
asynchronous two-way communication between data buses. The
transmit/receive (T/R) input determines the direction of data flow
throughthebidirectionaltransceiver.Transmit(activeHIGH)enables
datafromAportstoBports, andreceive(activeLOW)fromBports
toAports.Theoutputenable(OE)input,whenHIGH,disablesboth
A and B ports by placing them in HIGH Z condition.
ProductPinConfiguration
T/R
1
2
3
4
5
6
7
8
9
10
20 Vcc
19 OE
A0
A1
A2
A3
A4
A5
A6
A7
LogicBlockDiagram
B0
B1
B2
B3
B4
B5
B6
B7
18
17
16
15
14
13
12
11
20-Pin
L,P,Q
R,S,H
T/R
OE
A0
B0
A1
B1
A2
GND
ProductPinDescription
PinName
OE
Description
3-State Output Enable Inputs (Active LOW)
Transmit/ReceiveInput
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
Ground
B2
T/R
A3
A0-A7
B0-B7
GND
B3
A4
B4
V
CC
Power
A5
(1)
TruthTable
B5
Inputs
A6
OE
L
T/R
Outputs
(2)
L
H
X
Bus B Data to Bus A
B6
(2)
L
Bus A Data to Bus B
A7
H
High Z State
B7
1. H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
2. 640 is inverting from input to output.
FCT245, 2245, 645, 2645 are non-inverting options.
FCT640 & FCT2640 are inverting options.
PS2012B
09/22/99
1
PI74FCT245T/640T/645T
25OhmSeriesPI74FCT2245T/2640T/2645T
OctalBidirectionalTransceivers
MaximumRatings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature .................................................................... 65°Cto+150°C
Ambient Temperature with Power Applied ....................................40°Cto+85°C
Note:
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
specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may
affect reliability.
Supply Voltage to Ground Potential (Inputs & V Only) ............. 0.5Vto+7.0V
CC
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
DC Electrical Characteristics(Over the Operating Range, T = 40°C to +85°C, V = 5.0V ±5%)
A
CC
(1)
(2)
Parameters Description
Test Conditions
Min. Typ
Max. Units
V
V
V
V
V
Output HIGH Voltage
Output LOW Current
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Input HIGH Current
Input LOW Current
High Impedance
V
V
V
= Min., V = V or V
I
I
I
= 15.0mA
2.4
3.0
V
OH
OL
OL
IH
CC
CC
CC
IN
IH
IL
IL
IL
OH
OL
OL
= Min., V = V or V
= 64mA
0.3 0.55
0.3 0.50
V
V
IN
IH
= Min., V = V or V
= 12mA (25Ω Series)
IN
IH
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
2.0
V
0.8
V
IL
I
I
I
I
I
I
(Except I/O pins) V = Max.
V
V
V
V
V
V
= VCC
=GND
= VCC
=GND
1
µA
µA
µA
µA
µA
µA
V
IH
CC
IN
(Except I/O pins) V = Max.
1
IL
CC
IN
(I/O pins Only) V = Max.
1
IH
CC
IN
(I/O pins Only) V = Max.
1
IL
CC
IN
V
= MAX.
= 2.7V
= 0.5V
1
1
OZH
OZL
CC
OUT
OUT
Output Current
V
Clamp Diode Voltage
Power Down Disable
Short Circuit Current
Input Hysteresis
V
V
V
= Min., I = 18 mA
0.7 1.2
IK
OFF
OS
CC
CC
CC
IN
I
I
= GND, V
=4.5V
100
µA
mA
mV
OUT
(3)
= Max. , V
= GND
60 120
200
OUT
V
H
Capacitance(T =25°C,f=1MHz)
A
(4)
Parameters
Description
TestConditions
Typ.
6
Max.
10
Units
pF
C
C
Input Capacitance
V
V
=0V
IN
IN
Output Capacitance
=0V
8
12
pF
OUT
OUT
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. TypicalvaluesareatV =5.0V,+25°Cambientandmaximumloading.
CC
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
PS2012B
09/22/99
2
PI74FCT245T/640T/645T
25OhmSeriesPI74FCT2245T/2640T/2645T
OctalBidirectionalTransceivers
PowerSupplyCharacteristics
(1)
(2)
Parameters Description
TestConditions
Min. Typ
Max.
Units
I
Quiescent Power
Supply Current
V
V
V
=Max.
=Max.,
=Max.,
V
= GND orV
CC
0.1
500
µA
CC
CC
CC
CC
IN
IN
IN
(3)
∆I
Supply Current per
Input@TTLHIGH
V
V
=3.4V
0.5
2.0
mA
CC
I
Supply Current per
=V
0.15
0.25
mA/
MHz
CCD
CC
(4)
Input per MHz
Outputs Open
OE=GND
V =GND
IN
T/R=GNDorV
CC
One Input Toggling
50%DutyCycle
(5)
I
C
Total Power Supply
Current
V
=Max.,
V
=V
CC
1.5
1.8
3.5
mA
CC
IN
(6)
Outputs Open
V =GND
IN
f = 10 MHZ
I
(5)
50%DutyCycle
T/R=OE=GND
One Bit Toggling
V =3.4V
4.5
IN
V =GND
IN
(5)
V
=Max.,
V
=V
CC
3.0
5.0
6.0
CC
IN
Outputs Open
V =GND
IN
f = 2.5 MHZ
I
(5)
50%DutyCycle
T/R=OE=GND
Eight Bits Toggling
V =3.4V
14.0
IN
V =GND
IN
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); all other inputs at V or GND.
IN
CC
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I =I
+ I
+ I
C
QUIESCENT
INPUTS DYNAMIC
I = I + DI DHNT + I
(f /2 + f N )
CCD CP I I
C
CC
CC
I
CC
= Quiescent Current
∆I = Power Supply Current for a TTL High Input (V = 3.4V)
CC
IN
D = Duty Cycle for TTL Inputs High
H
N = Number of TTL Inputs at D
T
H
I
f
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
CCD
CP
f = Input Frequency
I
N = Number of Inputs at f
I
I
All currents are in milliamps and all frequencies are in megahertz.
PS2012B
09/22/99
3
PI74FCT245T/640T/645T
25OhmSeriesPI74FCT2245T/2640T/2645T
OctalBidirectionalTransceivers
PI74FCT245T/2245TSwitchingCharacteristicsoverOperatingRange
245T/2245T 245AT/2245AT 245CT/2245CT
Com. Com. Com.
245DT
Com.
(1)
Parameters Description
Conditions
Min.
Max.
Min.
Max.
Min.
Max.
Min
Max. Unit
t
t
t
t
t
t
t
t
t
t
Propagation Delay
A to B, B to A
OutputEnableTime
OE to A or B
C = 50 pF
R =500Ohm
L
1.5
1.5
1.5
1.5
1.5
7.0
1.5
1.5
1.5
1.5
1.5
4.6
1.5
1.5
1.5
1.5
1.5
4.1
1.5
1.5
1.5
1.5
1.5
3.8
5.0
4.3
5.0
4.3
n s
ns
ns
ns
n s
PLH
PHL
PZH
PZL
PHZ
PLZ
PZH
PZL
PHZ
PLZ
L
9.0
7.5
9.0
7.5
6.2
5.0
6.2
5.0
5.8
4.8
5.8
4.8
Output Disable Time
(3)
OE to A or B
OutputEnableTime
T/R to A or B
(3)
Output Disable Time
(3)
T/R to A or B
PI74FCT640T/2640TSwitchingCharacteristicsoverOperatingRange
640T/2640T 640AT/2640AT 640CT/2640CT
Com. Com. Com.
640DT
Com.
(1)
Parameters Description
Conditions
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max. Unit
t
t
t
t
t
t
t
t
t
t
Propagation Delay
A to B, B to A
OutputEnableTime
OE to A or B
C = 50 pF
R =500Ohm
L
2.0
2.0
2.0
2.0
2.0
7.0
1.5
1.5
1.5
1.5
1.5
5.0
1.5
1.5
1.5
1.5
1.5
4.4
1.5
3.7
5.0
4.3
5.0
4.3
n s
n s
n s
n s
n s
PLH
PHL
PZH
PZL
PHZ
PLZ
PZH
PZL
PHZ
PLZ
L
13.0
10.0
13.0
10.0
6.2
5.0
6.2
5.0
5.8
4.8
5.8
4.8
1.5
1.5
1.5
1.5
Output Disable Time
(3)
OE to A or B
OutputEnableTime
T/R to A or B
(3)
Output Disable Time
(3)
T/R to A or B
PI74FCT645T/2645TSwitchingCharacteristicsoverOperatingRange
645T/2645T 645AT/2645AT 645CT/2645CT
Com. Com. Com.
645DT
Com.
(1)
Parameters Description
Conditions
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max. Unit
t
t
t
t
t
t
t
t
t
t
Propagation Delay
A to B, B to A
OutputEnableTime
OE to A or B
C = 50 pF
R =500Ohm
L
1.5
1.5
1.5
1.5
1.5
9.5
1.5
1.5
1.5
1.5
1.5
4.6
1.5
1.5
1.5
1.5
1.5
4.1
1.5
3.8
5.0
4.3
5.0
4.3
n s
n s
n s
n s
n s
PLH
PHL
PZH
PZL
PHZ
PLZ
PZH
PZL
PHZ
PLZ
L
11.0
12.0
11.0
12.0
6.2
5.0
6.2
5.0
5.8
4.8
5.8
4.8
1.5
1.5
1.5
1.5
Output Disable Time
(3)
OE to A or B
OutputEnableTime
T/R to A or B
(3)
Output Disable Time
(3)
T/R to A or B
Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
PS2012B
09/22/99
4
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DIODES
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