OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
The F240, F241 and F244 are octal buffers and line drivers designed to be
employed as memory address drivers, clock drivers, and bus-oriented trans-
mitters/receivers which provide improved PC board density.
•
3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
•
Outputs Sink 64 mA
•
15 mA Source Current
•
Input Clamp Diodes Limit High-Speed Termination Effects
•
ESD > 4000 Volts
MC54/74F240
MC54/74F241
MC54/74F244
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
FAST™ SCHOTTKY TTL
CONNECTION DIAGRAMS
J SUFFIX
CERAMIC
CASE 732-03
1
MC54/74F240
VCC OEb Ya0
20
19
18
Ib0
17
Ya1
16
Ib1
15
Ya2
14
Ib2
13
Ya3
12
Ib3
11
20
N SUFFIX
PLASTIC
CASE 738-03
20
1
1
2
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
10
DW SUFFIX
SOIC
CASE 751D-03
OEa Ia0
Yb3 GND
20
1
VCC OEb Ya0
20
19
18
MC54/74F241
Ib0 Ya1 Ib1 Ya2
17
16
15
14
Ib2
13
Ya3 Ib3
12
11
ORDERING INFORMATION
MC54FXXXJ
Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
10
Yb3 GND
MC54/74F244
VCC OEb Ya0 Ib0 Ya1 Ib1 Ya2
20
19
18
17
16
15
14
Ib2
13
Ya3
12
Ib3
11
1
OEa
2
Ia0
3
Yb0
4
Ia1
5
Yb1
6
Ia2
7
Yb2
8
Ia3
9
10
Yb3 GND
FAST AND LS TTL DATA
4-108
MC54/74F240
•
MC54/74F241
•
MC54/74F244
FUNCTION TABLE
MC54/74F240
Inputs
OEa
L
L
H
Ia
L
H
X
OEb
L
L
H
Ib
L
H
X
Outputs
Ya
H
L
Z
Yb
H
L
Z
FUNCTION TABLE
MC54/74F241
Inputs
OEa
L
L
H
Ia
L
H
X
OEb
H
H
L
Ib
L
H
X
Outputs
Ya
L
H
Z
Yb
L
H
Z
FUNCTION TABLE
MC54/74F244
Inputs
OEa Ia
L
L
L
H
H
X
OEb Ib
L
L
L
H
H
X
Outputs
Ya
L
H
Z
Yb
L
H
Z
H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care; Z = High Impedance
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
Parameter
54, 74
54
74
IOH
IOL
Output Current — High
54
74
Output Current — Low
54
74
Min
4.5
–55
0
Typ
5.0
25
25
Max
5.5
125
70
–12
–15
48
64
mA
mA
Unit
V
°C
FAST AND LS TTL DATA
4-109
MC54/74F240
•
MC54/74F241
•
MC54/74F244
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VIK
VOH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
54, 74
74
54
74
VOL
Output LOW Voltage
54
74
IOZH
IOZL
IIH
Output Off Current HIGH
Output Off Current LOW
Input HIGH Current
2.4
2.7
2.0
2.0
0.55
0.55
50
–50
20
100
IIL
Input LOW Current
Data Inputs
F241, F244
Other
IOS
Output Short Circuit Current
(Note 2)
ICCH
Power Supply Current HIGH
74
54
F240
F241, F244
ICCL
Power Supply Current LOW
F240
F241, F244
ICCZ
Power Supply Current OFF
F240
F241, F244
–100
–100
–1.6
–1.0
–225
–275
35
60
75
90
75
90
mA
VCC = MAX
mA
mA
VOUT = GND
VCC = MAX
mA
3.4
3.4
Min
2.0
0.8
–1.2
Typ
Max
Unit
V
V
V
V
V
V
V
V
V
µA
µA
µA
Test Conditions
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
IIN = –18 mA
IOH = –3.0 mA
IOH = –3.0 mA
IOH = –12 mA
IOH = –15 mA
IOL = 48 mA
IOL = 64 mA
VOUT = 2.7 V
VOUT = 0.5 V
VIN = 2.7 V
VIN = 7.0 V
VIN = 0.5 V
VCC = MAX
VCC = MAX
VCC = MAX
VCC = MAX
VCC = MIN
VCC = 4.50 V
VCC = 4.75 V
VCC = 4.50 V
VCC = 4.50 V
VCC = MIN
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
4-110
MC54/74F240
•
MC54/74F241
•
MC54/74F244
AC CHARACTERISTICS – MC54/74F240
54/74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Output Disable Time
Output Enable Time
Parameter
Propagation Delay, Data to Output
Min
2.5
1.5
2.0
4.0
2.0
1.5
Typ
5.1
3.5
3.5
6.9
4.0
6.0
Max
7.0
4.7
5.2
9.0
5.3
8.0
54F
TA = -55°C to +125°C
VCC = 5.0 V
±
10%
CL = 50 pF
Min
2.5
1.5
2.0
4.0
2.0
2.0
Max
9.0
6.0
6.5
13.5
6.5
12.5
74F
TA = 0°C to +70°C
VCC = 5.0 V
±
10%
CL = 50 pF
Min
2.5
1.5
2.0
4.0
2.0
1.5
Max
8.0
5.7
5.7
10
6.3
9.5
ns
ns
Unit
ns
AC CHARACTERISTICS – MC54/74F241
54/74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Output Disable Time
Output Enable Time
Parameter
Propagation Delay, Data to Output
Min
2.5
2.5
2.0
2.0
2.0
2.0
Typ
4.0
4.0
4.3
5.4
4.5
4.5
Max
5.2
5.2
5.7
7.0
6.0
6.5
54F
TA = -55°C to +125°C
VCC = 5.0 V
±
10%
CL = 50 pF
Min
2.0
2.0
2.0
2.0
2.0
2.0
Max
6.5
7.0
7.0
8.5
7.0
12.5
74F
TA = 0°C to +70°C
VCC = 5.0 V
±
10%
CL = 50 pF
Min
2.5
2.5
2.0
2.0
2.0
2.0
Max
6.2
6.5
6.7
8.0
7.0
7.5
ns
ns
Unit
ns
AC CHARACTERISTICS – MC54/74F244
54/74F
TA = +25°C
VCC = +5.0 V
CL = 50 pF
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Output Disable Time
Output Enable Time
Parameter
Propagation Delay, Data to Output
Min
2.5
2.5
2.0
2.0
2.0
2.0
Typ
4.0
4.0
4.3
5.4
4.5
4.5
Max
5.2
5.2
5.7
7.0
6.0
6.0
54F
TA = -55°C to +125°C
VCC = 5.0 V
±
10%
CL = 50 pF
Min
2.5
2.5
2.0
2.0
2.0
2.0
Max
6.5
7.0
7.0
8.5
7.0
10.0
74F
TA = 0°C to +70°C
VCC = 5.0 V
±
10%
CL = 50 pF
Min
2.5
2.5
2.0
2.0
2.0
2.0
Max
6.2
6.5
6.7
8.0
7.0
7.0
ns
ns
Unit
ns
FAST AND LS TTL DATA
4-111
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