Original Creation Date: 06/28/96
Last Update Date: 03/31/97
Last Major Revision Date: 06/28/96
MN54AC251-X REV 1B0
MICROCIRCUIT DATA SHEET
8-Input Multiplexer With TRI-STATE Outputs
General Description
The AC251 is a high-speed 8-input digital multiplexer. It provides, in one package, the
ability to select one bit of data from up to eight sources. It can be used as a universal
function generator to generate any logic function of four variables. Both assertion and
negation outputs are provided.
NS Part Numbers
54AC251DMQB
54AC251FMQB
54AC251LMQB
Industry Part Number
54AC251
Prime Die
Z251
Processing
MIL-STD-883, Method 5004
Quality Conformance Inspection
MIL-STD-883, Method 5005
Subgrp Description Temp ( C)
o
1
Static tests at
+25
2
Static tests at
+125
3
Static tests at
-55
4
Dynamic tests at
+25
5
Dynamic tests at
+125
6
Dynamic tests at
-55
7
Functional tests at
+25
8A
Functional tests at
+125
8B
Functional tests at
-55
9
Switching tests at
+25
10
Switching tests at
+125
11
Switching tests at
-55
1
MICROCIRCUIT DATA SHEET
MN54AC251-X REV 1B0
Features
- ICC and IOZ reduced by 50%
- Multifunctional capability
- On-chip select logic decoding
- Inverting and noninverting TRI-STATE outputs
- Outputs source/sink 24 mA
- Standard Military Drawing (SMD)
- ACT251: 5962-89599
2
MICROCIRCUIT DATA SHEET
MN54AC251-X REV 1B0
(Absolute Maximum Ratings)
(Note 1)
Supply Voltage (Vcc)
-0.5V to +7.0V
DC Input Diode Current (Iik)
-20 mA
Vi = -0.5V
+20 mA
Vi = Vcc +0.5V
DC Input Voltage (Vi)
-0.5V to Vcc +0.5V
DC Output Diode Current (Iok)
-20 mA
Vo = -0.5V
+20 mA
Vo = Vcc +0.5V
DC Output Voltage (Vo)
-0.5V to Vcc +0.5V
DC Output Source or Sink Current (Io)
+50 mA
DC Vcc or Ground Current per Output Pin (Icc or Ignd)
+50 mA
Storage Temperature (Tstg)
-65 C to +150 C
Junction Temperature (Tj)
175 C
CDIP
Note 1:
Absolute maximum ratings are those values beyond which damage to the device may
occur. The databook specification should be met, without exception, to ensure that
the system design is reliable over its power supply, temperature, and output/input
loading variables. National does not recommend operation of FACT TM circuits outside
databook specifications.
Recommended Operating Conditions
Supply Voltage (Vcc)
2.0V to 6.0V
Input Voltage (Vi)
0V to Vcc
Output Voltage (Vo)
0V to Vcc
Operating Temperature (Ta)
-55 C to +125 C
Minimum Input Edge Rate (Delta V/Delta t)
AC Devices
Vin from 30% to 70% of Vcc
125 mV/ns
Vcc @ 3.0V, 4.5V, 5.5V
3
MN54AC251-X REV 1B0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
DC PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC:
VCC 3.0V to 5.5V, Temperature Range: -55C to 125C. NOTE: -55C TEMPERATURE, SUBGROUP 3 IS GUARANTEED
BUT NOT TESTED.
SYMBOL
PARAMETER
CONDITIONS
NOTES
PIN-
NAME
MIN
MAX
UNIT
SUB-
GROUPS
IIH
High Level Input
Current
VCC=5.5V, VM=5.5V, VINL=0.0V
1, 2 INPUT
0.1
uA
1
1, 2 INPUT
1.0
uA
2, 3
IIL
Low Level Input
Current
VCC=5.5V, VM=0.0V, VINH=5.5V
1, 2 INPUT
-0.1
uA
1
1, 2 INPUT
-1.0
uA
2, 3
VOL
Low Level Output
Voltage
VCC=3.0V, VIH=2.1V, VIL=0.9V,
IOL=12.0mA, VINH=3.0V, VINL=0.0V
1, 2 OUTPUT
.36
V
1
1, 2 OUTPUT
.50
V
2, 3
VCC=3.0V, VIH=2.1V, VIL=0.9V,
IOL=50.0uA, VINH=3.0V, VINL=0.0V
1, 2 OUTPUT
.10
V
1, 2,
3
VCC=4.5V, VIH=3.15V, VIL=1.35V,
IOL=50.0uA, VINH=4.5V, VINL=0.0V
1, 2 OUTPUT
.10
V
1, 2,
3
VCC=5.5V, VIH=3.85V, VIL=1.65V,
IOL=24.0mA, VINH=5.5V, VINL=0.0V
1, 2 OUTPUT
.36
V
1
1, 2 OUTPUT
.50
V
2, 3
VCC=5.5V, VIH=3.85V, VIL=1.65V,
IOL=50.0uA, VINH=5.5V, VINL=0.0V
1, 2 OUTPUT
.10
V
1, 2,
3
VCC=4.5V, VIH=3.15V, VIL=1.35V,
IOL=24.0mA, VINH=4.5V, VINL=0.0V
1, 2 OUTPUT
.36
V
1
1, 2 OUTPUT
.50
V
2, 3
VIOL
Dynamic Output
Current Low
VCC=5.5V, VIH=3.85V, VIL=1.65V,
IOL=50.0mA, VINH=5.5V, VINL=0.0V
1,
2, 5
OUTPUT
1.65
V
1, 2,
3
VOH
High Level Output
Voltage
VCC=3.0V, VIH=2.1V, VIL=0.9V,
IOH=-50.0uA, VINH=3.0V, VINL=0.0V
1, 2 OUTPUT
2.90
V
1, 2,
3
VCC=3.0V, VIH=2.1V, VIL=.90V,
IOH=-12.0mA, VINH=3.0V, VINL=0.0V
1, 2 OUTPUT
2.56
V
1
1, 2 OUTPUT
2.40
V
2, 3
VCC=5.5V, VIH=3.85V, VIL=1.65V,
IOH=-24.0mA, VINH=5.5V, VINL=0.0V
1, 2 OUTPUT
4.86
V
1
1, 2 OUTPUT
4.70
V
2, 3
VCC=4.5V, VIH=3.15V, VIL=1.35V,
IOH=-24.0mA, VINH=4.5V, VINL=0.0V
1, 2 OUTPUT
3.86
V
1
1, 2 OUTPUT
3.70
V
2, 3
VCC=4.5V, VIH=3.15V, VIL=1.35V,
IOH=-50.0uA, VIHN=4.5V, VINL=0.0V
1, 2 OUTPUT
4.40
V
1, 2,
3
VCC=5.5V, VIH=3.85V, VIL=1.65V,
IOH=-50.0uA, VINH=5.5V, VINL=0.0V
1, 2 OUTPUT
5.40
V
1, 2,
3
VIOH
Dynamic Output
Current High
VCC=5.5V, VIH=3.85V, VIL=1.65V,
IOH=-50.0mA, VINH=5.5V, VINL=0.0V
1,
2, 5
OUTPUT
3.85
V
1, 2,
3
ICCH
Supply Current
Outputs HIGH
VCC=5.5V, VINH=5.5V, VINL=0.0V
1, 2 VCC
4.0
uA
1
1, 2 VCC
80
uA
2, 3
4
MN54AC251-X REV 1B0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
DC PARAMETERS(Continued)
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC:
VCC 3.0V to 5.5V, Temperature Range: -55C to 125C. NOTE: -55C TEMPERATURE, SUBGROUP 3 IS GUARANTEED
BUT NOT TESTED.
SYMBOL
PARAMETER
CONDITIONS
NOTES
PIN-
NAME
MIN
MAX
UNIT
SUB-
GROUPS
ICCL
Supply Current
Outputs LOW
VCC=5.5V, VINL=0.0V
1, 2 VCC
4.0
uA
1
1, 2 VCC
80
uA
2, 3
ICCZ
Supply Current
Outputs Tri-State
VCC=5.5V, VINH=5.5V, VINL=0.0V
1, 2 VCC
4.0
uA
1
1, 2 VCC
80
uA
2, 3
IOZH
Maximum TRI-STATE
Leakage Current
High
VCC=3.0V, VM=3.0V, VINH=3.0V,
VINL=0.0V, VIH=2.1V
1, 2 OUTPUT
0.25
uA
1
1, 2 OUTPUT
5.0
uA
2, 3
VCC=4.5V, VM=4.5V, VINH=4.5V,
VINL=0.0V, VIH=3.15V
1, 2 OUTPUT
0.25
uA
1
1, 2 OUTPUT
5.0
uA
2, 3
VCC=5.5V, VM=5.5V, VINH=5.5V,
VINL=0.0V, VIH=3.85V
1, 2 OUTPUT
0.25
uA
1
1, 2 OUTPUT
5.0
uA
2, 3
IOZL
Maximum TRI-STATE
Leakage Current
Low
VCC=3.0V, VM=0.0V, VINH=3.0V,
VINL=0.0V, VIH=2.1V
1, 2 OUTPUT
-0.25
uA
1
1, 2 OUTPUT
-5.0
uA
2, 3
VCC=4.5V, VM=0.0V, VINH=4.5V,
VINL=0.0V, VIH=3.15V
1, 2 OUTPUT
-0.25
uA
1
1, 2 OUTPUT
-5.0
uA
2, 3
VCC=5.5V, VM=0.0V, VINH=5.5V,
VINL=0.0V, VIH=3.85V
1, 2 OUTPUT
-0.25
uA
1
1, 2 OUTPUT
-5.0
uA
2, 3
AC PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC:
CL=50pf, RL=500 OHMS, TRISE=3ns, TFALL=3ns, Temp Range: -55C to125C. NOTE: -55C TEMPERATURE, SUBGROUP
11 IS GUARANTEED BUT NOT TESTED.
tpLH(1)
Propagation Delay
VCC=4.5V
3,
4, 6
In to Z
or Z
1.5
10.0
ns
9
3,
4, 6
In to Z
or Z
1.5
12.0
ns
10, 11
tpHL(1)
Propagation Delay
VCC=4.5V
3,
4, 6
In to Z
or Z
1.5
10.0
ns
9
3,
4, 6
In to Z
or Z
1.5
12.0
ns
10, 11
tpLH(2)
Propagation Delay
VCC=4.5V
3,
4, 6
Sn to Z
or Z
1.5
12.5
ns
9
3,
4, 6
Sn to Z
or Z
1.5
15.5
ns
10, 11
5
MN54AC251-X REV 1B0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
AC PARAMETERS(Continued)
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC:
CL=50pf, RL=500 OHMS, TRISE=3ns, TFALL=3ns, Temp Range: -55C to125C. NOTE: -55C TEMPERATURE, SUBGROUP
11 IS GUARANTEED BUT NOT TESTED.
SYMBOL
PARAMETER
CONDITIONS
NOTES
PIN-
NAME
MIN
MAX
UNIT
SUB-
GROUPS
tpHL(2)
Propagation Delay
VCC=4.5V
3,
4, 6
Sn to Z
or Z
1.5
12.5
ns
9
3,
4, 6
Sn to Z
or Z
1.5
15.5
ns
10, 11
tpZH(1)
Output Enable
Time
VCC=4.5V
3,
4, 6
OE to Z
or Z
1.5
8.0
ns
9
3,
4, 6
OE to Z
or Z
1.5
10.0
ns
10, 11
tpZL(1)
Output Enable
Time
VCC=4.5V
3,
4, 6
OE to Z
or Z
1.5
8.0
ns
9
3,
4, 6
OE to Z
or Z
1.5
10.0
ns
10, 11
tpHZ(1)
Output Disable
Time
VCC=4.5V
3,
4, 6
OE to Z
or Z
1.5
9.5
ns
9
3,
4, 6
OE to Z
or Z
1.5
11.0
ns
10, 11
tpLZ(1)
Output Disable
Time
VCC=4.5V
3,
4, 6
OE to Z
or Z
1.5
8.0
ns
9
3,
4, 6
OE to Z
or Z
1.5
10.0
ns
10, 11
tpLH(3)
Propagation Delay
VCC=3.0V
3, 4 In to Z
or Z
1.0
14.0
ns
9
3, 4 In to Z
or Z
1.0
17.0
ns
10, 11
tpHL(3)
Propagation Delay
VCC=3.0V
3, 4 In to Z
or Z
1.0
14.0
ns
9
3, 4 In to Z
or Z
1.0
16.5
ns
10, 11
tpLH(4)
Propagation Delay
VCC=3.0V
3, 4 Sn to Z
or Z
1.0
17.5
ns
9
3, 4 Sn to Z
or Z
1.0
21.0
ns
10, 11
tpHL(4)
Propagation Delay
VCC=3.0V
3, 4 Sn to Z
or Z
1.0
17.5
ns
9
3, 4 Sn to Z
or Z
1.0
21.0
ns
10, 11
tpZH(2)
Output Enable
Time
VCC=3.0V
3, 4 OE to Z
or Z
1.0
11.0
ns
9
3, 4 OE to Z
or Z
1.0
13.0
ns
10, 11
6
MN54AC251-X REV 1B0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
AC PARAMETERS(Continued)
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC:
CL=50pf, RL=500 OHMS, TRISE=3ns, TFALL=3ns, Temp Range: -55C to125C. NOTE: -55C TEMPERATURE, SUBGROUP
11 IS GUARANTEED BUT NOT TESTED.
SYMBOL
PARAMETER
CONDITIONS
NOTES
PIN-
NAME
MIN
MAX
UNIT
SUB-
GROUPS
tpZL(2)
Output Enable
Time
VCC=3.0V
3, 4 OE to Z
or Z
1.0
11.0
ns
9
3, 4 OE to Z
or Z
1.0
13.0
ns
10, 11
tpHZ(2)
Output Disable
Time
VCC=3.0V
3, 4 OE to Z
or Z
1.0
11.5
ns
9
3, 4 OE to Z
or Z
1.0
14.0
ns
10, 11
tpLZ(2)
Output Disable
Time
VCC=3.0V
3, 4 OE to Z
or Z
1.0
11.0
ns
9
3, 4 OE to Z
or Z
1.0
13.0
ns
10, 11
Note 1:
SCREEN TESTED 100% ON EACH DEVICE AT +25C & +125C TEMPERATURE, SUBGROUPS 1, 2, 7, &
8.
Note 2:
SAMPLE TESTED (METHOD 5005, TABLE 1) ON EACH MFG. LOT AT +25C & +125C TEMPERATURE,
SUBGROUPS A1, 2, 7, & 8.
Note 3:
SCREEN TESTED 100% ON EACH DEVICE AT +25C TEMPERATURE ONLY, SUBGROUP A9.
Note 4:
SAMPLE TESTED (METHOD 5005, TABLE 1) ON EACH MFG. LOT AT +25C & +125C TEMPERATURE,
SUBGROUPS A9 & 10.
Note 5:
TRANSMISSION LINE DRIVING TEST, GUARDBAND LIMITS SET FOR +25C, 2MSEC DURATION MAX.
Note 6:
+25C & +125C MIN LIMITS GUARANTEED FOR 5.5V BY GUARDBANDING 4.5V MIN. LIMITS.
7
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