Integral IN74ACT251N 8-input data selector/multiplexer with 3-state output Datasheet

IN74ACT251
8-INPUT DATA SELECTOR/MULTIPLEXER
WITH 3-STATE OUTPUTS
High-Speed Silicon-Gate CMOS
•
•
•
•
The IN74ACT251 is identical in pinout to the LS/ALS251,
HC/HCT251. The IN74ACT251 may be used as a level converter
for interfacing TTL or NMOS outputs to High Speed CMOS inputs.
The device selects one of the eight binary Data Inputs, as
determined by the Address Inputs. The Output Enable pin must be
at a low level for the selected data to appear at the outputs. If
Output Enable is high, the Y and the Y outputs are in the highimpedance state. This 3-State feature allows the IN74ACT251 to
be used in bus-oriented systems.
• TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0 µA; 0.1 µA @ 25°C
Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74ACT251N Plastic
IN74ACT251D SOIC
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
X
L
Inputs
A0 Output
Enable
X
X
H
L
L
L
Z
D0
L
L
H
L
D1
L
H
L
L
D2
L
H
H
L
D3
H
L
L
L
D4
H
L
H
L
D5
H
H
L
L
D6
H
H
H
L
D7
A2
PIN 16 =VCC
PIN 8 = GND
A1
Outputs
Y
Y
D0,D1...D7=the level of the
respective D input
Z = high-impedance state
X = don’t care
1
Z
D0
D1
D2
D3
D4
D5
D6
D7
IN74ACT251
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
-0.5 to +7.0
V
VIN
DC Input Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
VOUT
DC Output Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
IIN
DC Input Current, per Pin
mA
±20
IOUT
DC Output Sink/Source Current, per Pin
mA
±50
ICC
DC Supply Current, VCC and GND Pins
mA
±50
PD
Power Dissipation in Still Air, Plastic DIP+
750
mW
SOIC Package+
500
Tstg
Storage Temperature
-65 to +150
°C
260
TL
Lead Temperature, 1 mm from Case for 10
°C
Seconds
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
DC Supply Voltage (Referenced to GND)
VIN, VOUT DC Input Voltage, Output Voltage (Referenced to
GND)
TJ
Junction Temperature (PDIP)
TA
Operating Temperature, All Package Types
IOH
Output Current - High
IOL
Output Current - Low
t r, tf
Input Rise and Fall Time * VCC =4.5 V
VCC =5.5 V
(except Schmitt Inputs)
*
VIN from 0.8 V to 2.0 V
Min
4.5
0
-40
0
0
Max
5.5
VCC
Unit
V
V
140
+85
-24
24
10
8.0
°C
°C
mA
mA
ns/V
This device contains protection circuitry to guard against damage due to high static
voltages or electric fields. However, precautions must be taken to avoid applications of any voltage
higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and
VOUT should be constrained to the range GND≤(VIN or VOUT)≤VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or
VCC). Unused outputs must be left open.
2
IN74ACT251
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
Guaranteed
VCC
Limits
Symbol Parameter
Test Conditions
V
25 °C -40°C to
85°C
VOUT=0.1 V or VCC-0.1 V 4.5
VIH
Minimum High2.0
2.0
Level Input
5.5
2.0
2.0
Voltage
VOUT=0.1 V or VCC-0.1 V 4.5
VIL
Maximum Low 0.8
0.8
Level Input
5.5
0.8
0.8
Voltage
VOH
Minimum High4.5
4.4
4.4
IOUT ≤ -50 µA
Level Output
5.5
5.4
5.4
Voltage
*
VIN=VIH or VIL
3.76
3.86
4.5
IOH=-24 mA
4.76
4.86
5.5
IOH=-24 mA
VOL
Maximum Low4.5
0.1
0.1
IOUT ≤ 50 µA
Level Output
5.5
0.1
0.1
Voltage
*
VIN=VIH or VIL
0.44
0.36
4.5
IOL=24 mA
0.44
0.36
5.5
IOL=24 mA
IIN
Maximum Input
VIN=VCC or GND
5.5
±0.1
±1.0
Leakage Current
5.5
1.5
Additional Max.
VIN=VCC - 2.1 V
∆ICCT
ICC/Input
5.5
IOZ
Maximum Three- VIN (OE)= VIH or VIL
±0.5
±5.0
State Leakage
VIN =VCC or GND
Current
VOUT =VCC or GND
VOLD=1.65 V Max
IOLD
+Minimum
5.5
75
Dynamic Output
Current
VOHD=3.85 V Min
IOHD
+Minimum
5.5
-75
Dynamic Output
Current
VIN=VCC or GND
ICC
Maximum
5.5
8.0
80
Quiescent Supply
Current
(per Package)
*
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
3
Unit
V
V
V
V
µA
mA
µA
mA
mA
µA
IN74ACT251
AC ELECTRICAL CHARACTERISTICS(VCC=5.0 V ± 10%, CL=50pF, Input tr=tf=3.0 ns)
Guaranteed Limits
Unit
Symbol
Parameter
25 °C
-40°C to
85°C
Min Max Min Max
17.0
ns
tPLH
Propagation
Delay,
Input
A
to 2.5 15.5 2.0
Output Y or Y (Figure 3)
18.5
ns
tPHL
Propagation
Delay,
Input
A
to 2.5 16.5 2.5
Output Y or Y (Figure 3)
13.0
ns
tPLH
Propagation
Delay,
Input
D
to 2.5 12.0 2.0
Output Y or Y (Figures 1,2)
14.0
ns
tPHL
Propagation
Delay,
Input
D
to 2.5 12.5 2.5
Output Y or Y (Figures 1,2)
8.5
1.5
9.0
ns
tPZH
Propagation Delay, Output Enable to 1.5
Output Y or Y (Figure 4)
8.5
1.5
9.5
ns
tPZL
Propagation Delay, Output Enable to 1.5
Output Y or Y (Figure 4)
13.0
ns
tPHZ
Propagation Delay, Output Enable to 2.0 12.0 2.0
Output Y or Y (Figure 4)
8.5
1.5
9.0
ns
tPLZ
Propagation Delay, Output Enable to 1.5
Output Y or Y (Figure 4)
CIN
Maximum Input Capacitance
4.5
4.5
pF
CPD
Typical @25°C,VCC=5.0
V
70
Power Dissipation Capacitance
Figure 1. Switching Waveforms
pF
Figure 2. Switching Waveforms
4
IN74ACT251
Figure 3. Switching Waveforms
Figure 4. Switching Waveforms
EXPANDED LOGIC DIAGRAM
5
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