PI74FCT238ATS [ETC]
3-To-8-Line Demultiplexer ; 3-至8行解复用器\n
| 型号： | PI74FCT238ATS |
| 厂家： | 
ETC |
| 描述： | 3-To-8-Line Demultiplexer
|
| 文件： | 总6页 (文件大小：190K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PI74FCT138T
PI74FCT238T
Fast CMOS 1-of-8 Decoder
ProductFeatures
PI74FCT138/238TispincompatiblewithbipolarFAST
Series at a higher speed and lower power consumption
TTL input and output levels
ProductDescription
Pericom Semiconductors PI74FCT series of logic circuits are
produced using the Companys advanced 0.8 micron CMOS
technology, achieving industry leading speed grades.
These high-speed decoders accept three binary weighted inputs
(A0,A1,A2)andgiveseightmutuallyexclusiveactiveLOWoutputs
(O0-O7: PI74FCT138T) or active HIGH outputs (O0-O7:
PI74FCT238T) when enabled. These devices contain three enable
inputs, two active LOW (E1, E2) and one active HIGH (E3). On the
PI74FCT138TalloutputswillbeHIGHandonthePI74FCT238Tall
outputs will be LOW, except when E1 and E2 are LOW and E3 is
HIGH.
Extremelylowstaticpower
Hysteresis on all inputs
Industrial operating temperature range: 40°C to +85°C
Packagesavailable:
16-pin150milwideplasticQSOP(Q)
16-pin300milwideplasticSOIC(S)
16-pin150milwideplasticSOIC(W)
LogicBlockDiagram
A
2
A
1
A
0
E
1
E
2
E3
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O0
PI74FCT138T function shown.
PS2004A 03/09/96
1
PI74FCT138/PI74FCT238T
1-of-8 Decoder
PI74FCT138TProductPinConfiguration
PI74FCT138TProductPinDescription
PinName
A0-A2
E1,E2
E3
Description
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
A
A
E
E
E
O
0
1
2
1
2
3
7
VCC
Address Inputs
O
O
O
O
O
O
O
0
1
2
3
4
5
6
Enable Inputs (Active LOW)
EnableInput(ActiveHIGH)
Outputs (Active LOW)
16-Pin
Q, S, W
O0-O7
GND
PI74FCT138T Truth Table (1)
Inputs
Outputs
E1
H
X
X
L
E2
X
H
X
L
E3
X
X
L
A0
X
X
X
L
A1
X
X
X
L
A2
X
X
X
L
O0
H
H
H
L
O1
H
H
H
H
L
O2
H
H
H
H
H
L
O3
O4
O5
H
H
H
H
H
H
H
H
L
O6
H
H
H
H
H
H
H
H
H
L
O7
H
H
H
H
H
H
H
H
H
H
L
Function
Disable
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
Disable
Disable
H
H
H
H
H
H
H
H
A2-0 = 0
A2-0 = 1
A2-0 = 2
A2-0 = 3
A2-0 = 4
A2-0 = 5
A2-0 = 6
A2-0 = 7
L
L
H
L
L
L
H
H
H
H
H
H
H
L
L
H
H
L
L
H
H
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
L
L
H
L
L
H
H
H
L
L
H
H
H
H
L
L
H
H
Note:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
PS2004A 03/09/96
2
PI74FCT138/PI74FCT238T
1-of-8 Decoder
PI74FCT238T Product Pin Description
PI74FCT238T Product Pin Configuration
Pin Name
A0-A2
E1, E2
E3
Description
Address Inputs
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A0
A1
A2
E1
E2
VCC
O0
O1
O2
O3
O4
O5
O6
Enable Inputs (Active LOW)
Enable Input (Active HIGH)
Outputs (Active HIGH)
16-PIN
Q16
S16
O0-O7
W16
E3
O7
GND
PI74FCT238T Truth Table (1)
Inputs
Outputs
E1
H
X
X
L
E2
X
H
X
L
E3
X
X
L
A0
X
X
X
L
A1
X
X
X
L
A2
X
X
X
L
O0
L
L
L
H
L
L
L
L
L
L
L
O1
O2
L
L
L
L
L
H
L
L
L
L
L
O3
L
L
L
L
L
L
H
L
L
L
L
O4
L
L
L
L
L
L
L
H
L
L
L
O5
L
L
L
L
L
L
L
L
H
L
L
O6
L
L
L
L
L
L
L
L
L
H
L
O7
L
L
L
L
L
L
L
L
L
L
H
Function
Disable
L
L
L
L
H
L
L
L
L
L
L
Disable
Disable
H
H
H
H
H
H
H
H
A2-0 = 0
A2-0 = 1
A2-0 = 2
A2-0 = 3
A2-0 = 4
A2-0 = 5
A2-0 = 6
A2-0 = 7
L
L
H
L
L
L
L
L
H
H
L
L
L
L
H
L
L
L
L
H
H
H
H
L
L
H
L
L
L
L
H
H
L
L
H
Note:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
PS2004A 03/09/96
3
PI74FCT138/PI74FCT238T
1-of-8 Decoder
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 ................................................................................... 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 = 5.0V ± 5%)
Parameters Description
Test Conditions(1) Min. Typ(2) Max. Units
Output HIGH Voltage VCC = Min., VIN = VIH or VIL
VOH
VOL
VIH
VIL
IIH
IOH = 15.0 mA
IOL = 48 mA
2.4
3.0
0.3
V
V
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
VCC = Min., VIN = VIH or VIL
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
VCC = Max.
0.50
2.0
V
0.8
1
V
VIN = VCC
µA
µA
V
IIL
VCC = Max.
VIN = GND
1
VIK
IOS
Clamp Diode Voltage VCC = Min., IIN = 18 mA
0.7
120
1.2
225
100
Short Circuit Current
Power Down Disable
Input Hysteresis
VCC = Max.(3), VOUT = GND
60
mA
µA
mV
IOFF
VH
VCC = GND, VOUT = 4.5V
200
Capacitance(TA =25°C,f=1MHz)
Parameters(4)
Description
TestConditions
VIN =0V
Typ
Max.
Units
pF
CIN
Input Capacitance
Output Capacitance
6
8
10
12
COUT
VOUT=0V
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, +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. This parameter is determined by device characterization but is not production tested.
PS2004A 03/09/96
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PI74FCT138/PI74FCT238T
1-of-8 Decoder
Power Supply Characteristics
Parameters Description
Test Conditions(1)
Min. Typ(2) Max. Units
ICC
Quiescent Power
Supply Current
VCC = Max.
VCC = Max.
VIN = GND
or VCC
0.1
500
2.0
0.3
µA
∆ICC
ICCD
Supply Current per
Input @ TTL HIGH
VIN = 3.4V(3)
0.5
mA
Supply Current per
Input per MHz(4)
VCC = Max., Outputs Open
One Input Toggling
50% Duty Cycle
VIN = VCC
VIN = GND
0.15
mA/
MHz
IC
Total Power Supply
Current(6)
VCC = Max., Outputs Open
fCP = 10 MHZ, 50% Duty Cycle
VIN = VCC
VIN = GND
1.5
1.8
4.0(5)
5.0(5)
mA
Toggle E1, E2, or E3
One Bit toggling
VIN = 3.4V
VIN = GND
Notes:
1. Fo 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); all other inputs at Vcc or GND.
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. IC =IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fINI)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fo = Output Frequency
No = Number of Outputs at fo
All currents are in milliamps and all frequencies are in megahertz.
PS2004A 03/09/96
5
PI74FCT138/PI74FCT238T
1-of-8 Decoder
PI74FCT138TSwitchingCharacteristicsoverOperatingRange
138T
Com.
138AT
Com.
138CT
Com.
Parameters
Description
Conditions(1)
=50pF
= 500
Min
Max
Min
Max
Min
Max
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
Propagation Delay
An to On
Propagation Delay
E1 or E2 to On
Propagation Delay
E3 to On
C
R
L
1.5
9.0
1.5
1.5
1.5
5.8
1.5
1.5
1.5
5.1
L
Ω
1.5
1.5
9.0
9.0
5.9
5.9
5.2
5.2
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
PI74FCT238T Switching Characteristics over Operating Range
238T
Com.
238AT
Com.
238CT
Com.
Parameters Description
Conditions(1)
Min
Max
Min
Max
Min
Max
Unit
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
Propagation Delay
An to On
Propagation Delay
E1 or E2 to On
Propagation Delay
E3 to On
C
R
L
L
= 50 pF
= 500
1.5
1.5
1.5
9.0
1.5
5.8
1.5
1.5
1.5
5.0
ns
Ω
8.0
8.0
1.5
1.5
5.9
5.9
5.0
5.0
ns
ns
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
PS2004A 03/09/96
6
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