TC74VHC240,244F/FT/FK
TOSHIBA CMOS Digital Integrated Circuit
Silicon Monolithic
TC74VHC240F,TC74VHC240FT,TC74VHC240FK
TC74VHC244F,TC74VHC244FT,TC74VHC244FK
Octal Bus Buffer
TC74VHC240F/FT/FK
Inverted, 3-State Outputs
TC74VHC244F/FT/FK
Non-Inverted, 3-State Outputs
The TC74VHC240 and 244 are advanced high speed CMOS
OCTAL BUS BUFFERs fabricated with silicon gate C
2
MOS
technology.
They achieve the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
The 74VHC240 is an inverting 3-state buffer having two
active-low output enables. The TC74VHC244 is a non-inverting
3-state buffer, and has two active-low output enables.
These devices are designed to be used with 3-state memory
address drivers, etc.
An input protection circuit ensures that 0 to 5.5 V can be
applied to the input pins without regard to the supply voltage.
This device can be used to interface 5 V to 3 V systems and two
supply systems such as battery back up. This circuit prevents
device destruction due to mismatched supply and input voltages.
TC74VHC240F, TC74VHC244F
TC74VHC240FT, TC74VHC244FT
TC74VHC240FK, TC74VHC244FK
Features
•
•
•
•
•
•
•
•
High speed: t
pd
=
3.9 ns (typ.) at V
CC
=
5 V
Low power dissipation: I
CC
=
4
μA
(max) at Ta = 25°C
High noise immunity: V
NIH
=
V
NIL
=
28% V
CC
(min)
Power down protection is provided on all inputs.
Balanced propagation delays: t
pLH
∼
t
pHL
−
Wide operating voltage range: V
CC (opr)
=
2 to 5.5 V
Low noise: V
OLP
=
0.8 V (max)
Pin and function compatible with 74ALS240/244
Weight
SOP20-P-300-1.27A
TSSOP20-P-0044-0.65A
VSSOP20-P-0030-0.50
: 0.22 g (typ.)
: 0.08 g (typ.)
: 0.03 g (typ.)
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2009-04-01
TC74VHC240,244F/FT/FK
Pin Assignment
TC74VHC240
1G
1A1
2Y 4
1A2
2Y3
1A3
2Y 2
1A4
2Y1
1
2
3
4
5
6
7
8
9
20
19
18
17
TC74VHC244
V
CC
2G
1Y1
1G
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
(top view)
V
CC
2G
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
2A4
1Y 2
2A3
1Y3
2A2
1Y 4
2A1
16
15
14
13
12
11
(top view)
GND 10
GND 10
IEC Logic Symbol
TC74VHC240
1G
1A1
1A2
1A3
1A4
(1)
(2)
(4)
(6)
(8)
EN
(18)
(16)
(14)
(12)
1Y1
1Y 2
1Y3
1Y 4
1G
1A1
1A2
1A3
1A4
(1)
(2)
(4)
(6)
(8)
TC74VHC244
EN
(18)
(16)
(14)
(12)
1Y1
1Y2
1Y3
1Y4
2G
2A1
2A2
2A3
2A4
(19)
(11)
(13)
(15)
(17)
EN
(9)
(7)
(5)
(3)
2Y1
2Y 2
2Y3
2Y 4
2G
2A1
2A2
2A3
2A4
(19)
(11)
(13)
(15)
(17)
EN
(9)
(7)
(5)
(3)
2Y1
2Y2
2Y3
2Y4
Truth Table
Inputs
Outputs
G
L
L
H
A
n
L
H
X
Y
n
L
H
Z
Y
n
H
L
Z
X: Don’t care
Z: High impedance
Y
n
: TC74VHC244
Y
n
: TC74VHC240
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2009-04-01
TC74VHC240,244F/FT/FK
Absolute Maximum Ratings (Note)
Characteristics
Supply voltage range
DC input voltage
DC output voltage
Input diode current
Output diode current
DC output current
DC V
CC
/ground current
Power dissipation
Storage temperature
Symbol
V
CC
V
IN
V
OUT
I
IK
I
OK
I
OUT
I
CC
P
D
T
stg
Rating
−
0.5 to 7.0
−
0.5 to 7.0
−
0.5 to V
CC
+
0.5
−
20
±
20
±
25
±
75
Unit
V
V
V
mA
mA
mA
mA
mW
°C
180
−
65 to 150
Note:
Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly
even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
maximum ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/“Derating Concept and Methods”) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
Operating Ranges (Note)
Characteristics
Supply voltage
Input voltage
Output voltage
Operating temperature
Input rise and fall time
Symbol
V
CC
V
IN
V
OUT
T
opr
dt/dv
Rating
2.0 to 5.5
0 to 5.5
0 to V
CC
−
40 to 85
Unit
V
V
V
°C
ns/V
0 to 100 (V
CC
=
3.3
±
0.3 V)
0 to 20 (V
CC
=
5
±
0.5 V)
Note:
The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either V
CC
or GND.
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2009-04-01
TC74VHC240,244F/FT/FK
Electrical Characteristics
DC Characteristics
Characteristics
Symbol
Test Condition
V
CC
(V)
High-level input
voltage
2.0
V
IH
⎯
Ta
=
25°C
Min
1.50
V
CC
×
0.7
⎯
⎯
Ta
=
−
40 to 85°C
Max
⎯
⎯
Unit
Typ.
⎯
⎯
⎯
⎯
Min
1.50
V
CC
×
0.7
―
―
1.9
2.9
4.4
2.48
3.80
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Max
⎯
⎯
3.0 to
5.5
2.0
V
Low-level input
voltage
0.50
V
CC
×
0.3
⎯
⎯
⎯
⎯
⎯
0.50
V
CC
×
0.3
⎯
⎯
⎯
⎯
⎯
V
IL
⎯
3.0 to
5.5
2.0
V
1.9
2.9
4.4
2.58
3.94
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
2.0
3.0
4.5
⎯
⎯
I
OH
= −
50
μ
A
High-level output
voltage
V
OH
V
IN
=
V
IH
or V
IL
I
OH
= −
4 mA
I
OH
= −
8 mA
I
OL
=
50
μ
A
Low-level output
voltage
V
OL
V
IN
=
V
IH
or V
IL
I
OL
=
4 mA
I
OL
=
8 mA
3-state output
off-state current
Input leakage
current
Quiescent supply
current
I
OZ
I
IN
I
CC
V
IN
=
V
IH
or V
IL
V
OUT
=
V
CC
or GND
V
IN
=
5.5 V or GND
V
IN
=
V
CC
or GND
3.0
4.5
3.0
4.5
2.0
3.0
4.5
3.0
4.5
5.5
0 to 5.5
5.5
V
0.0
0.0
0.0
⎯
⎯
⎯
⎯
⎯
0.1
0.1
0.1
0.36
0.36
±
0.25
±
0.1
0.1
0.1
0.1
0.44
0.44
±
2.50
±
1.0
μ
A
μ
A
μ
A
V
4.0
40.0
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2009-04-01
TC74VHC240,244F/FT/FK
AC Characteristics
(input: t
r
=
t
f
=
3 ns)
Characteristics
Symbol
Test Condition
V
CC
(V)
Propagation delay
time
(TC74VHC240)
3.3
±
0.3
⎯
Ta
=
25°C
C
L
(pF)
15
50
15
50
15
50
15
50
15
50
15
50
50
50
50
50
Min
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Ta
=
−
40 to 85°C
Max
7.5
11.0
5.5
7.5
8.4
11.9
5.5
7.5
10.6
14.1
7.3
9.3
14.0
9.2
1.5
1.0
10
⎯
⎯
⎯
Unit
Typ.
5.3
7.8
3.6
5.1
5.8
8.3
3.9
5.4
6.6
9.1
4.7
6.2
10.3
6.7
⎯
⎯
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
⎯
⎯
⎯
⎯
⎯
⎯
Max
9.0
12.5
6.5
8.5
10.0
13.5
6.5
8.5
12.5
16.0
8.5
10.5
16.0
10.5
1.5
1.0
10
⎯
⎯
⎯
t
pLH
t
pHL
ns
5.0
±
0.5
Propagation delay
time
(TC74VHC244)
t
pLH
t
pHL
3.3
±
0.3
⎯
ns
5.0
±
0.5
3-state output enable
time
t
pZL
t
pZH
3.3
±
0.3
R
L
=
1 k
Ω
5.0
±
0.5
3.3
±
0.3
5.0
±
0.5
3.3
±
0.3
5.0
±
0.5
⎯
⎯
ns
3-state output disable
time
Output to output skew
Input capacitance
Output capacitance
Power dissipation
capacitance (Note 2)
t
pLZ
t
pHZ
t
osLH
t
osHL
C
IN
C
OUT
C
PD
R
L
=
1 k
Ω
ns
(Note 1)
ns
pF
pF
pF
4
6
17
19
TC74VHC240
TC74VHC244
Note 1: Parameter guaranteed by design.
t
osLH
=
|t
pLHm
−
t
pLHn
|, t
osHL
=
|t
pHLm
−
t
pHLn
|
Note 2: C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
I
CC (opr)
=
C
PD
·V
CC
·f
IN
+
I
CC
/ 8 (per bit)
Noise Characteristics
(input: t
r
=
t
f
=
3 ns)
Characteristics
Quiet output maximum dynamic V
OL
Quiet output minimum dynamic V
OL
Minimum high level dynamic input
voltage
Maximum low level dynamic input
voltage
Symbol
V
OLP
V
OLV
V
IHD
V
ILD
C
L
=
50 pF
C
L
=
50 pF
C
L
=
50 pF
C
L
=
50 pF
Test Condition
V
CC
(V)
5.0
5.0
5.0
5.0
Ta
=
25°C
Typ.
0.5
−
0.5
⎯
⎯
Limit
0.8
−
0.8
Unit
V
V
V
V
3.5
1.5
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2009-04-01
