74HC240; 74HCT240
Rev. 5 — 15 July 2020
Octal buffer/line driver; 3-state; inverting
Product data sheet
1. General description
The 74HC240; 74HCT240 is an 8-bit inverting buffer/line driver with 3-state outputs. The device
can be used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE
and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to
assume a high-impedance OFF-state. Inputs include clamp diodes. This enables the use of current
limiting resistors to interface inputs to voltages in excess of V
CC
.
2. Features and benefits
•
•
•
•
•
Wide supply voltage range from 2.0 V to 6.0 V
CMOS low power dissipation
High noise immunity
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
Complies with JEDEC standards:
•
JESD8C (2.7 V to 3.6 V)
•
JESD7A (2.0 V to 6.0 V)
Input levels:
•
For 74HC240: CMOS level
•
For 74HCT240: TTL level
Inverting 3-state outputs
ESD protection:
•
HBM JESD22-A114F exceeds 2000 V
•
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
•
•
•
•
•
•
3. Ordering information
Table 1. Ordering information
Type number
Package
Temperature range
74HC240D
74HCT240D
74HC240DB
74HCT240DB
74HC240PW
74HCT240PW
74HC240BQ
74HCT240BQ
-40 °C to +125 °C
DHVQFN20
-40 °C to +125 °C
TSSOP20
-40 °C to +125 °C
SSOP20
-40 °C to +125 °C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
plastic dual in-line compatible thermal enhanced
very thin quad flat package; no leads; 20 terminals;
body 2.5 × 4.5 × 0.85 mm
Version
SOT163-1
SOT339-1
SOT360-1
SOT764-1
Nexperia
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
4. Functional diagram
2
4
1A0
1Y0
18
1A1
1Y1
16
6
1A2
1Y2
14
1
EN
18
16
14
12
8
1
1A3
1OE
1Y3
12
2
2
17
4
15
6
13
8
11
1
19
1A0
2A0
1A1
2A1
1A2
2A2
1A3
2A3
1OE
2OE
1Y0 18
2Y0 3
1Y1 16
2Y1 5
4
6
8
17
15
2A0
2Y0
3
2A1
2Y1
5
19
1Y2 14
2Y2
7
11
13
15
17
mgu779
EN
9
7
5
3
mgu778
13
2A2
2Y2
7
1Y3 12
2Y3 9
11
19
2A3
2OE
2Y3
9
mgu780
Fig. 1.
Logic symbol
Fig. 2.
IEC logic symbol
Fig. 3.
Functional diagram
74HC_HCT240
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 5 — 15 July 2020
2 / 15
Nexperia
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
5. Pinning information
5.1. Pinning
74HC240
74HCT240
1OE
2
3
4
5
6
7
8
9
GND 10
2A3 11
GND
(1)
1
terminal 1
index area
1A0
2Y0
20 V
CC
19 2OE
18 1Y0
17 2A0
16 1Y1
15 2A1
14 1Y2
13 2A2
12 1Y3
74HC240
74HCT240
1OE
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
1
2
3
4
5
6
7
8
9
20 V
CC
19 2OE
18 1Y0
17 2A0
16 1Y1
15 2A1
14 1Y2
13 2A2
12 1Y3
11 2A3
001aag233
1A1
2Y1
1A2
2Y2
1A3
2Y3
001aag234
Transparent top view
GND 10
Fig. 4.
Pin configuration SOT163-1 (SO20), SOT339-1
(SSOP20) and SOT360-1 (TSSOP20)
(1) This is not a ground pin. There is no electrical or
mechanical requirement to solder the pad. In case
soldered, the solder land should remain floating or
connected to GND.
Fig. 5.
Pin configuration SOT764-1 (DHVQFN20)
5.2. Pin description
Table 2. Pin description
Symbol
1OE, 2OE
1A0, 1A1, 1A2, 1A3
2Y0, 2Y1, 2Y2, 2Y3
GND
2A0, 2A1, 2A2, 2A3
1Y0, 1Y1, 1Y2, 1Y3
V
CC
Pin
1, 19
2, 4, 6, 8
3, 5, 7, 9
10
17, 15, 13, 11
18, 16, 14, 12
20
Description
output enable input (active LOW)
data input
bus output
ground (0 V)
data input
bus output
supply voltage
6. Functional description
Table 3. Function table
H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
Input
nOE
L
L
H
nAn
L
H
X
Output
nYn
H
L
Z
74HC_HCT240
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 5 — 15 July 2020
3 / 15
Nexperia
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
[1]
Conditions
V
I
< -0.5 V or V
I
> V
CC
+ 0.5 V
V
O
< -0.5 V or V
O
> V
CC
+ 0.5 V
-0.5 V < V
O
< V
CC
+ 0.5 V
Min
-0.5
-
-
-
-
-70
-65
[1]
-
Max
+7
±20
±20
±35
70
-
+150
500
Unit
V
mA
mA
mA
mA
mA
°C
mW
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
For SOT163-1 (SO20) package: P
tot
derates linearly with 12.3 mW/K above 109 °C.
For SOT339-1 (SSOP20) package: P
tot
derates linearly with 10.0 mW/K above 100 °C.
For SOT360-1 (TSSOP20) package: P
tot
derates linearly with 10.0 mW/K above 100 °C.
For SOT764-1 (DHVQFN20) package: P
tot
derates linearly with 12.9 mW/K above 111 °C.
8. Recommended operating conditions
Table 5. Recommended operating conditions
Symbol Parameter
Conditions
Min
V
CC
V
I
V
O
Δt/ΔV
supply voltage
input voltage
output voltage
input transition rise and fall rate V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
T
amb
ambient temperature
2.0
0
0
-
-
-
-40
74HC240
Typ
5.0
-
-
-
1.67
-
+25
Max
6.0
V
CC
V
CC
625
139
83
+125
Min
4.5
0
0
-
-
-
-40
74HCT240
Typ
5.0
-
-
-
1.67
-
+25
Max
5.5
V
CC
V
CC
-
139
-
V
V
V
ns/V
ns/V
ns/V
Unit
+125 °C
9. Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
Min
74HC240
V
IH
HIGH-level
input voltage
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
V
IL
LOW-level input V
CC
= 2.0 V
voltage
V
CC
= 4.5 V
V
CC
= 6.0 V
1.5
3.15
4.2
-
-
-
1.2
2.4
3.2
0.8
2.1
2.8
-
-
-
0.5
1.35
1.8
1.5
3.15
4.2
-
-
-
-
-
-
0.5
1.35
1.8
1.5
3.15
4.2
-
-
-
-
-
-
0.5
1.35
1.8
V
V
V
V
V
V
25 °C
Typ
Max
-40 °C to
+85 °C
Min
Max
-40 °C to
+125 °C
Min
Max
Unit
74HC_HCT240
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 5 — 15 July 2020
4 / 15
Nexperia
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
Conditions
Min
25 °C
Typ
2.0
4.5
6.0
4.32
5.81
0
0
0
0.15
0.16
-
-
-
3.5
Max
-
-
-
-
-
0.1
0.1
0.1
0.26
0.26
±0.1
±0.5
8.0
-
-40 °C to
+85 °C
Min
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
-
-
-
-
Max
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
±1.0
±5.0
80
-
-40 °C to
+125 °C
Min
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
-
-
-
-
Max
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
±1.0
±10
160
-
V
V
V
V
V
V
V
V
V
V
μA
μA
μA
pF
Unit
Symbol Parameter
V
OH
HIGH-level
output voltage
V
I
= V
IH
or V
IL
I
O
= -20 μA; V
CC
= 2.0 V
I
O
= -20 μA; V
CC
= 4.5 V
I
O
= -20 μA; V
CC
= 6.0 V
I
O
= -6.0 mA; V
CC
= 4.5 V
I
O
= -7.8 mA; V
CC
= 6.0 V
1.9
4.4
5.9
3.98
5.48
-
-
-
-
-
-
-
-
-
V
OL
LOW-level
output voltage
V
I
= V
IH
or V
IL
I
O
= 20 μA; V
CC
= 2.0 V
I
O
= 20 μA; V
CC
= 4.5 V
I
O
= 20 μA; V
CC
= 6.0 V
I
O
= 6.0 mA; V
CC
= 4.5 V
I
O
= 7.8 mA; V
CC
= 6.0 V
I
I
I
OZ
I
CC
C
I
input leakage
current
OFF-state
output current
supply current
input
capacitance
HIGH-level
input voltage
V
I
= V
CC
or GND; V
CC
= 6.0 V
V
I
= V
IH
or V
IL
; V
CC
= 6.0 V;
V
O
= V
CC
or GND
V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 6.0 V
74HCT240
V
IH
V
IL
V
OH
V
CC
= 4.5 V to 5.5 V
2.0
-
1.6
1.2
-
0.8
2.0
-
-
0.8
2.0
-
-
0.8
V
V
LOW-level input V
CC
= 4.5 V to 5.5 V
voltage
HIGH-level
output voltage
V
I
= V
IH
or V
IL
; V
CC
= 4.5 V
I
O
= -20 μA
I
O
= -6 mA
V
I
= V
IH
or V
IL
; V
CC
= 4.5 V
I
O
= 20 μA
I
O
= 6.0 mA
V
I
= V
CC
or GND; V
CC
= 5.5 V
V
I
= V
IH
or V
IL
; V
CC
= 5.5 V;
V
O
= V
CC
or GND
V
I
= V
CC
or GND; V
CC
= 5.5 V;
I
O
= 0 A
per input pin; V
I
= V
CC
- 2.1 V;
other inputs at V
CC
or GND;
V
CC
= 4.5 V to 5.5 V; I
O
= 0 A
nAn or inputs
nOE input
4.4
3.98
-
-
-
-
-
4.5
4.32
0
0.16
-
-
-
-
-
0.1
0.26
±0.1
±0.5
8.0
4.4
3.84
-
-
-
-
-
-
-
0.1
0.33
±1.0
±5.0
80
4.4
3.7
-
-
-
-
-
-
-
0.1
0.4
±1.0
±10
160
V
V
V
V
μA
μA
μA
V
OL
LOW-level
output voltage
I
I
I
OZ
I
CC
ΔI
CC
input leakage
current
OFF-state
output current
supply current
additional
supply current
-
-
-
150
70
3.5
540
252
-
-
-
-
675
315
-
-
-
-
735
343
-
μA
μA
pF
C
I
input
capacitance
74HC_HCT240
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2020. All rights reserved
Product data sheet
Rev. 5 — 15 July 2020
5 / 15
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