21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT251T
Ω
(25Ω Series) PI74FCT2151T
PI74FCT151/2151/251T
8-INPUT
PI74FCT151T
MULTIPLEXER
Fast CMOS 8-Input Multiplexer
Product Features:
• PI74FCT151/251/2151T is pin compatible with bipolar FAST™
Series at a higher speed and lower power consumption
• 25Ω series resistor on all outputs (FCT2xxx Only)
• TTL input and output levels
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• 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)
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are pro-
duced in the Company’s advanced 0.8 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT151T, PI74FCT251T, and PI74FCT2151T are high-
speed 8-input multiplexers. They select one bit from a source of
eight under the control of three select inputs. Both assertion and
negation outputs are provided.
The PI74FCT151/2151T has a common, active-LOW, Enable
input (E). When E is LOW, data from one of eight inputs is directed
to the complementary outputs based on the 3-bit code applied to the
Select (S
0
-S
2
) inputs. The PI74FCT151/2151T can be used as a
data routing device from one of eight sources.
The PI74FCT251T has a common Active-LOW Output Enable
(OE) input. When OE is LOW, data from one of eight inputs is
directed to the complementary outputs. When OE is HIGH, both
outputs are switched to a high-impedance state allowing multiplexer
expansion by tying several outputs together.
Logic Block Diagram
I
7
I
6
I
5
Z
I
4
Z
I
3
I
2
I
1
I
0
FCT251 Only
S
2
S
1
S
0
E for 151
OE for 251
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Product Pin Description
Pin Name
I
0
-I
7
S
0
-S
2
E
OE
Z
Z
GND
V
CC
Description
Data Inputs
Select Inputs
Enable Input (Active LOW) FCT151/2151T
Output Enable (Active LOW) FCT251T
Data Output
Inverted Data Output
Ground
Power
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PI74FCT151/2151/251T
8-INPUT MULTIPLEXER
Truth Table
(1)
S
2
X
X
L
L
L
L
H
H
H
H
S
1
X
X
L
L
H
H
L
L
H
H
Inputs
S
0
X
X
L
H
L
H
L
H
L
H
Outputs
E/OE
(2)
H
H
L
L
L
L
L
L
L
L
Z
L
(3)
Z
(4)
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
Z
H
(3)
Z
(4)
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
PI74FCT151/2151T Product Pin Configuration
I
3
I
2
I
1
I
0
Z
Z
* E or OE
GND
1
2
3
4
5
6
7
8
16-PIN
Q16
S16
W16
16
15
14
13
12
11
10
9
V
CC
I
4
I
5
I
6
I
7
S
0
S
1
S
2
Notes:
1. E for 151/2151, OE for 251.
2. H = High Voltage Level
L = Low Voltage Level
X = Don’t Care
Z = High Impedance
3. 151/2151 ONLY.
4. 251 ONLY.
* E for 151/2151 only, OE for 251 only
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PI74FCT151/2151/251T
8-INPUT MULTIPLEXER
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, T
A
= –40°C to +85°C, V
CC
= 5V ± 5%)
Parameters Description
V
OH
V
OL
V
OL
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
OS
I
OFF
V
H
Output HIGH Voltage
Output LOW Current
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance
Output Current
Clamp Diode Voltage
Short Circuit Current
Power Down Disable
Input Hysteresis
V
CC
= Min., I
IN
= –18 mA
V
CC
= Max.
(3)
, V
OUT
= GND
V
CC
= GND, V
OUT
= 4.5V
–60
—
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.
V
IN
= V
CC
V
IN
= GND
V
OUT
= 2.7V
V
OUT
= 0.5V
–0.7
–120
—
200
100
I
OH
= –15.0 mA
I
OL
= 48 mA
I
OL
= 12 mA
(25Ω series)
2.0
0.8
1
–1
1
–1
–1.2
Min.
2.4
Typ
(2)
3.0
0.3
0.3
0.50
0.50
Max.
Units
V
V
V
V
V
µA
µA
µA
µA
V
mA
µA
mV
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ
6
8
Max.
10
12
Units
pF
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.
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PI74FCT151/2151/251T
8-INPUT MULTIPLEXER
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
E or OE = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
E or OE = GND
One Bit Toggling
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
0.5
0.15
Max.
500
2.0
0.25
Units
µA
mA
mA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
3.2
6.5
(5)
mA
3.5
7.5
(5)
Notes:
1. For conditions shown as Max. or Min., 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 (V
IN
= 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. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
∆I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
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PI74FCT151/2151/251T
8-INPUT MULTIPLEXER
PI74FCT151/2151T Switching Characteristics over Operating Range
151T/2151T
Com.
151AT/2151AT
Com.
Max
Min
Max
Min
151CT/2151CT
Com.
Max
Unit
Parameters
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Description
Propagation Delay
S
n
to Z
Propagation Delay
S
n
to Z
Propagation Delay
E to Z
Propagation Delay
E to Z
Propagation Delay
I
n
to Z
Propagation Delay
I
n
to Z
Conditions
(1)
C
L
= 50 pF
R
L
= 500Ω
Min
1.5
1.5
1.5
1.5
1.5
1.5
9.0
10.5
7.0
9.5
6.5
7.5
1.5
1.5
1.5
1.5
1.5
1.5
6.6
6.8
5.6
5.8
5.2
5.5
1.5
1.5
1.5
1.5
1.5
1.5
5.6
5.8
4.8
5.0
4.4
4.7
ns
ns
ns
ns
ns
ns
PI74FCT251T Switching Characteristics over Operating Range
251T
Com.
251AT
Com.
Max
Min
Max
Min
251CT
Com.
Max
Unit
Parameters
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
S
n
to Z
Propagation Delay
S
n
to Z
Propagation Delay
I
n
to Z
Propagation Delay
I
n
to Z
Output Enable Time
OE to Z
Output Disable Time
(3)
OE to Z
Output Enable Time
OE to Z
Output Disable Time
(3)
OE to Z
Conditions
(1)
C
L
= 50 pF
R
L
= 500Ω
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
9.0
11.0
7.0
7.0
9.0
7.5
9.0
7.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
6.6
6.8
5.2
5.5
6.7
6.0
6.7
6.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
5.6
5.8
4.4
4.7
5.7
5.0
5.7
5.0
ns
ns
ns
ns
ns
ns
ns
ns
Notes:
1. See test circuit and wave forms.
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
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PS2028A 03/11/96
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