Integral IN74AC257N Quad 2-input date selector/multiplexer with 3-state outputs high-speed silicon-gate cmo Datasheet

TECHNICAL DATA
IN74AC257
Quad 2-Input Data Selector/Multiplexer
with 3-State Outputs
High-Speed Silicon-Gate CMOS
The IN74AC257 is identical in pinout to the LS/ALS257,
HC/HCT257. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS
outputs.
This device selects a (4-bit) nibble from either the A or B inputs as
determined by the Select input. The nibble is presented at the outputs
in noninverted from when the Output Enable pin is at a low level. A
high level on the Output Enable pin switches the outputs into the highimpedance state.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA; 0.1 µA @ 25°C
• High Noise Immunity Characteristic of CMOS Devices
• Output Source/Sink 24 mA
ORDERING INFORMATION
IN74AC257N Plastic
IN74AC257D SOIC
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
PIN 16 =VCC
PIN 8 = GND
356
Outputs
Output
Enable
Select
Y0-Y3
H
X
Z
L
L
A0-A3
L
H
B0-B3
X=don’t care
Z = high-impedance state
A0-A3,B0-B3=the levels of the respective
Nibble Inputs
IN74AC257
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
-0.5 to +7.0
V
VCC
DC Supply Voltage (Referenced to GND)
VIN
DC Input Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
DC Output Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
DC Input Current, per Pin
±20
mA
IOUT
DC Output Sink/Source Current, per Pin
±50
mA
ICC
DC Supply Current, VCC and GND Pins
±50
mA
PD
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
750
500
mW
-65 to +150
°C
260
°C
VOUT
IIN
Tstg
TL
Storage Temperature
Lead Temperature, 1 mm from Case for 10 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
VCC
VIN, VOUT
DC Supply Voltage (Referenced to GND)
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
tr, tf
*
Parameter
Input Rise and Fall Time
(except Schmitt Inputs)
*
Min
Max
Unit
2.0
6.0
V
0
VCC
V
140
°C
+85
°C
-24
mA
24
mA
150
40
25
ns/V
-40
VCC =3.0 V
VCC =4.5 V
VCC =5.5 V
0
0
0
VIN from 30% to 70% VCC
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.
357
IN74AC257
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
VCC
Guaranteed Limits
V
25 °C
-40°C to
85°C
Unit
VOUT=0.1 V or VCC-0.1 V
3.0
4.5
5.5
2.1
3.15
3.85
2.1
3.15
3.85
V
Maximum Low Level Input Voltage
VOUT=0.1 V or VCC-0.1 V
3.0
4.5
5.5
0.9
1.35
1.65
0.9
1.35
1.65
V
Minimum High-Level
Output Voltage
IOUT ≤ -50 µA
3.0
4.5
5.5
2.9
4.4
5.4
2.9
4.4
5.4
V
3.0
4.5
5.5
2.56
3.86
4.86
2.46
3.76
4.76
3.0
4.5
5.5
0.1
0.1
0.1
0.1
0.1
0.1
VIN=VIH or VIL
IOL=12 mA
IOL=24 mA
IOL=24 mA
3.0
4.5
5.5
0.36
0.36
0.36
0.44
0.44
0.44
Symbol
Parameter
VIH
Minimum High-Level
Input Voltage
VIL
VOH
Test Conditions
*
VIN= VIH or VIL
IOH=-12 mA
IOH=-24 mA
IOH=-24 mA
VOL
Maximum Low-Level
Output Voltage
IOUT ≤ 50 µA
V
*
IIN
Maximum Input
Leakage Current
VIN=VCC or GND
5.5
±0.1
±1.0
µA
IOZ
Maximum ThreeState Leakage
Current
VIN(OE)= VIH or VIL
VIN =VCC or GND
VOUT =VCC or GND
5.5
±0.5
±5.0
µA
IOLD
+Minimum Dynamic
Output Current
VOLD=1.65 V Max
5.5
75
mA
IOHD
+Minimum Dynamic
Output Current
VOHD=3.85 V Min
5.5
-75
mA
ICC
Maximum Quiescent
Supply Current
(per Package)
VIN=VCC or GND
5.5
80
µA
*
8.0
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC
358
IN74AC257
AC ELECTRICAL CHARACTERISTICS(CL=50pF, Input tr=tf=3.0 ns)
VCC*
Symbol
Parameter
Guaranteed Limits
25 °C
V
-40°C to
85°C
Min
Max
Min
Max
Unit
tPLH
Propagation Delay, Nibble A or B to
Output Y (Figure 1)
3.3
5.0
1.5
1.5
8.5
6.0
1.0
1.0
9.0
7.0
ns
tPHL
Propagation Delay, Nibble A or B to
Output Y (Figure 1)
3.3
5.0
1.5
1.5
8.5
6.0
1.0
1.0
9.0
7.0
ns
tPLH
Propagation Delay, Select to Output Y (Figure
2)
3.3
5.0
1.5
1.5
10.5
7.5
1.5
1.0
11.5
8.5
ns
tPHL
Propagation Delay, Select to Output Y (Figure
2)
3.3
5.0
1.5
1.5
10.5
7.5
1.5
1.0
11.5
8.5
ns
tPZH
Propagation Delay, Output Enable to
Output Y (Figure 3)
3.3
5.0
1.5
1.5
9.5
7.5
1.0
1.0
10.5
8.5
ns
tPZL
Propagation Delay, Output Enable to
Output Y (Figure 3)
3.3
5.0
1.5
1.5
9.0
8.5
1.0
1.0
10.0
9.5
ns
tPHZ
Propagation Delay, Output Enable to
Output Y (Figure 3)
3.3
5.0
1.5
1.5
10.0
9.0
1.0
1.0
11.0
10.0
ns
tPLZ
Propagation Delay, Output Enable to
Output Y (Figure 3)
3.3
5.0
1.5
1.5
9.0
8.0
1.0
1.0
10.0
9.0
ns
CIN
Maximum Input Capacitance
5.0
4.5
4.5
pF
Typical @25°C,VCC=5.0 V
CPD
Power Dissipation Capacitance
50
pF
Voltage Range 3.3 V is 3.3 V ±0.3 V
Voltage Range 5.0 V is 5.0 V ±0.5 V
*
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
359
IN74AC257
Figure 3. Switching Waveforms
EXPANDED LOGIC DIAGRAM
360
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