INTEGRATED CIRCUITS
74F2240
Octal inverter buffer with 30Ω equivalent
output termination (3-State)
74F2241
Octal buffer with 30Ω equivalent output
termination (3-State)
Product specification
IC15 Data Handbook
1990 Dec 13
Philips
Semiconductors
Philips Semiconductors
Product specification
Octal buffers
74F2240, 74F2241
FEATURES
•
Octal bus interface
•
30Ω output termination ideal for driving DRAM
•
15mA source current
DESCRIPTION
The 74F2240 and 74F2241 are octal buffers that are ideal for
driving dynamic DRAM with impedance matching. The outputs are
all capable of sinking 5mA and sourcing up to 15mA. The device
features two output enables, each controlling four of the 3-state
outputs.
TYPICAL
PROPAGATION
DELAY
4.3ns
4.5ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
37mA
30mA
PIN CONFIGURATION
74F2240
OEa 1
Ia0 2
Yb0 3
Ia1 4
Yb1 5
Ia2 6
Yb2 7
Ia3 8
Yb3 9
GND 10
20 V
CC
19 OEb
18 Ya0
17 Ib0
16 Ya1
15 Ib1
14 Ya2
13 Ib2
12 Ya3
11 Ib3
SF00561
TYPE
74F2240
74F2241
LOGIC SYMBOL
74F2240
2
4
6
8
17 15 13 11
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
N74F2240N, N74F2241N
N74F2240D, N74F2241D
PKG DWG #
1
19
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
OEa
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
20-pin plastic DIP
20-pin plastic SOL
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING
AND FAN-OUT TABLE
PINS
Ian, Ibn
OEa, OEb
OEb
Yan, Ybn
DESCRIPTION
Data inputs
Output enable inputs
(active Low)
Output enable input
(74F2241)
Data outputs (74F2241)
74F (U.L.)
HIGH/LOW
1.0/0.33
1.0/0.33
1.0/0.33
750/8.33
LOAD
VALUE
HIGH/LOW
20µA/0.2mA
20µA/0.2mA
20µA/0.2mA
15mA/5mA
18 16 14 12
V
CC
= Pin 20
GND = Pin 10
3
5
7
9
SF00562
IEC/IEEE SYMBOL
74F2240
1
19
EN1
EN2
2
4
6
8
17
15
13
11
2
18
16
14
12
3
5
7
9
2D
1
Yan, Ybn Data outputs (74F2240)
750/8.33
15mA/5mA
NOTE:
One (1.0) FAST unit load is defined as: 20µA in the High
state and 0.6mA in the Low state.
SF00563
December 13, 1990
2
853-1524 01255
Philips Semiconductors
Product specification
Octal buffers
74F2240, 74F2241
PIN CONFIGURATION
74F2241
OEa 1
Ia0 2
Yb0 3
Ia1 4
Yb1 5
Ia2 6
Yb2 7
Ia3 8
Yb3 9
GND 10
20 V
CC
19 OEb
LOGIC DIAGRAM FOR 74F2240
Ia0
2
18
Ya0
Ib0
17
2
Yb0
Ia1
18 Ya0
17 Ib0
16 Ya1
15 Ib1
14 Ya2
13 Ib2
12 Ya3
11 Ib3
OEa
Ia3
Ia2
4
15
Ya1
Ib1
15
5
Yb1
6
14
Ya2
12
Ya3
Ib2
13
7
Yb2
9
Yb3
8
Ib3
11
1
OEb
10
V
CC
= Pin 20
GND = Pin 10
SF00567
SF00564
LOGIC DIAGRAM FOR 74F2241
LOGIC SYMBOL
74F2241
2
4
6
8
17 15 13 11
Ia1
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
1
19
OEa
OEb
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
OEa
Ia0
2
18
Ya0
Ib0
17
2
Yb0
4
15
Ya1
Ib1
15
5
Yb1
Ia2
6
14
Ya2
12
Ya3
Ib2
13
7
Yb2
9
Yb3
Ia3
8
Ib
11
1
OEb
10
18 16 14 12
V
CC
= Pin 20
GND = Pin 10
3
5
7
9
V
CC
= Pin 20
GND = Pin 10
SF00568
SF00565
FUNCTION TABLE FOR 74F2240
IEC/IEEE SYMBOL
74F2241
1
19
EN1
EN2
INPUTS
OEa
L
L
H
18
16
14
12
2
3
5
7
9
OUTPUTS
Ib
L
H
X
Ya
H
L
Z
Yb
H
L
Z
Ia
L
H
X
OEb
L
L
H
2
4
6
8
17
15
13
11
2D
1
Notes to function table for 74F2240
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
FUNCTION TABLE FOR 74F2241
INPUTS
SF00566
OUTPUTS
Ib
L
H
X
Ya
L
H
Z
Yb
L
H
Z
OEa
L
L
H
Ia
L
H
X
OEb
H
H
L
Notes to function table for 74F2241
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
December 13, 1990
3
Philips Semiconductors
Product specification
Octal buffers
74F2240, 74F2241
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in high output state
Current applied to output in low output state
Operating free air temperature range
Storage temperature range
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to V
CC
10
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°
C
°
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
MIN
V
CC
V
IH
V
IL
I
Ik
I
OH
I
OL
T
amb
Supply voltage
High–level input voltage
Low–level input voltage
Input clamp current
High–level output current
Low–level output current
Operating free air temperature range
0
4.5
2.0
0.8
–18
–15
5
+70
LIMITS
NOM
5.0
MAX
5.5
V
V
V
mA
mA
mA
UNIT
°
C
December 13, 1990
4
Philips Semiconductors
Product specification
Octal buffers
74F2240, 74F2241
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
V
CC
= MIN,
V
OH
High-level output voltage
V
IL
= MAX,
V
IH
= MIN
I
OH
=
–15mA
I
OL
= MAX
TEST
CONDITIONS
1
I
OH
= –3mA
±10%V
C
±5%V
CC
±10%V
C
±5%V
CC
±10%V
C
C
C
C
LIMITS
MIN
2.4
2.7
2.0
2.0
0.50
0.42
–0.73
0.50
-1.2
100
20
–0.2
50
–50
-60
25
53
35
19
-150
35
75
45
30
65
40
3.4
TYP
2
MAX
UNIT
V
V
V
V
V
V
V
µA
µA
mA
µA
µA
mA
mA
mA
mA
mA
mA
mA
V
OL
Low-level output voltage
V
CC
= MIN,
V
IL
= MAX,
V
IH
= MIN,
V
CC
= MIN, I
I
= I
IK
±5%V
CC
V
IK
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
Input clamp voltage
Input current at maximum input voltage
High–level input current
Low–level input current
Off–state output current,
high–level voltage applied
Off–state output current,
low–level voltage applied
Short–circuit output current
3
I
CCH
74F2240
I
CCL
I
CCZ
I
CCH
74F2241
I
CCL
I
CCZ
V
CC
= MAX, V
I
= 7.0V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX, V
O
= 2.7V
V
CC
= MAX, V
O
= 0.5V
V
CC
= MAX
V
CC
= MAX
I
CC
Supply current (total)
V
CC
= MAX
45
27
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
°
C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
amb
= +25
°
C
SYMBOL
PARAMETER
TEST
CONDITION
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
Ian, Ibn to Yn
Output enable time
to high or low level
Output disable time
from high or low level
Propagation delay
Ian, Ibn to Yn
Output enable time
to high or low level
Output disable time
from high or low level
74F2241
74F2240
MIN
Waveform 1
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
3.0
2.0
3.0
3.5
2.0
1.0
3.0
2.5
3.0
3.5
2.0
1.5
V
CC
= +5.0V
C
L
= 50pF, R
L
= 500Ω
TYP
5.0
3.5
4.5
5.0
3.5
2.5
4.5
4.5
5.0
5.5
4.0
3.5
MAX
7.0
5.5
7.0
8.0
6.5
5.5
7.0
6.5
7.0
7.5
6.0
6.0
T
amb
= 0
°
C to +70
°
C
V
CC
= +5.0V
±
10%
C
L
= 50pF, R
L
= 500Ω
MIN
2.5
2.0
2.5
3.0
1.5
1.0
2.5
2.5
2.0
3.0
1.5
1.0
MAX
8.0
6.0
8.0
9.0
7.0
5.5
8.0
7.5
8.0
8.5
7.0
6.5
ns
ns
ns
ns
ns
ns
UNIT
December 13, 1990
5
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