74VHC27 — Triple 3-Input NOR Gate
December 2007
74VHC27
Triple 3-Input NOR Gate
Features
■
High speed: t
PD
=
4.1ns (typ) at T
A
=
25°C
■
Low power dissipation: I
CC
=
2µA (max) at T
A
=
25°C
■
High noise immunity: V
NIH
=
V
NIL
=
28% V
CC
(min.)
■
Power down protection is provided on all inputs
■
Low noise: V
OLP
=
0.8V (max.)
■
Pin and function compatible with 74HC27
General Description
The VHC27 is an advanced high speed CMOS 3-Input
NOR Gate fabricated with silicon gate CMOS technol-
ogy. It achieves the high-speed operation similar to
equivalent Bipolar Schottky TTL while maintaining the
CMOS low power dissipation.
The internal circuit is composed of 3 stages including
buffer output, which provide high noise immunity and
stable output. An input protection circuit insures that 0V
to 7V can be applied to the input pins without regard to
the supply voltage. This device can be used to interface
5V to 3V systems and two supply systems such as bat-
tery backup. This circuit prevents device destruction due
to mismatched supply and input voltages.
Ordering Information
Order Number
74VHC27M
74VHC27SJ
74VHC27MTC
Package
Number
M14A
M14D
MTC14
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150"
Narrow
14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
©1994 Fairchild Semiconductor Corporation
74VHC27 Rev. 1.4.0
www.fairchildsemi.com
74VHC27 — Triple 3-Input NOR Gate
Connection Diagram
Logic Symbol
IEEE/IEC
Pin Descriptions
Pin Names
A
n
, B
n
, C
n
Y
n
Inputs
Outputs
Truth Table
Description
A
H
X
X
L
X
=
Don't Care
B
X
H
X
L
C
X
X
H
L
Y
L
L
L
H
©1994 Fairchild Semiconductor Corporation
74VHC27 Rev. 1.4.0
www.fairchildsemi.com
2
74VHC27 — Triple 3-Input NOR Gate
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
V
CC
V
IN
V
OUT
I
IK
I
OK
I
OUT
I
CC
T
STG
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage
Input Diode Current
Output Diode Current
DC Output Current
DC V
CC
/GND Current
Storage Temperature
Parameter
Rating
–0.5V to +7.0V
–0.5V to +7.0V
–0.5V to V
CC
+ 0.5V
–20mA
±20mA
±25mA
±50mA
–65°C to +150°C
260°C
Lead Temperature (Soldering, 10 seconds)
Recommended Operating Conditions
(1)
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
IN
V
OUT
T
OPR
t
r
, t
f
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time,
V
CC
=
3.3V ± 0.3V
V
CC
=
5.0V ± 0.5V
Parameter
Rating
2.0V to +5.5V
0V to +5.5V
0V to V
CC
–40°C to +85°C
0ns/V
∼
100ns/V
0ns/V
∼
20ns/V
Note:
1. Unused inputs must be held HIGH or LOW. They may not float.
©1994 Fairchild Semiconductor Corporation
74VHC27 Rev. 1.4.0
www.fairchildsemi.com
3
74VHC27 — Triple 3-Input NOR Gate
DC Electrical Characteristics
T
A
=
25°C
Symbol
V
IH
V
IL
V
OH
–40°C to +85°C
Max.
Min.
1.50
0.7 x V
CC
0.50
0.3 x V
CC
0.50
0.3 x V
CC
1.9
2.9
4.4
2.48
3.80
V
V
Parameter
HIGH Level
Input Voltage
LOW Level
Input Voltage
HIGH Level
Output
Voltage
V
CC
(V)
2.0
3.0–5.5
2.0
3.0–5.5
2.0
3.0
4.5
3.0
4.5
Conditions
Min.
1.50
0.7 x V
CC
Typ.
Max.
Units
V
V
IN
=
V
IH
or V
IL
I
OH
=
–50µA
1.9
2.9
4.4
2.0
3.0
4.5
I
OH
=
–4mA
I
OH
=
–8mA
V
IN
=
V
IH
or V
IL
I
OL
=
50µA
2.58
3.94
0.0
0.0
0.0
0.1
0.1
0.1
0.36
0.36
±0.1
2.0
V
OL
LOW Level
Output
Voltage
2.0
3.0
4.5
3.0
4.5
0.1
0.1
0.1
0.44
0.44
±1.0
20.0
V
I
OL
=
4mA
I
OL
=
8mA
V
IN
=
5.5V or GND
V
IN
=
V
CC
or GND
I
IN
I
CC
Input Leakage
Current
Quiescent
Supply
Current
0–5.5
5.5
µA
µA
Noise Characteristics
T
A
=
25°C
Symbol
V
OLP(2)
V
OLV(2)
V
IHD(2)
V
ILD(2)
Parameter
Quiet Output Maximum
Dynamic V
OL
Quiet Output Minimum
Dynamic V
OL
Minimum HIGH Level
Dynamic Input Voltage
Maximum LOW Level
Dynamic Input Voltage
V
CC
(V)
5.0
5.0
5.0
5.0
Conditions
C
L
=
50pF
C
L
=
50pF
C
L
=
50pF
C
L
=
50pF
Typ.
0.3
–0.3
Limits
0.8
–0.8
3.5
1.5
Units
V
V
V
V
Note:
2. Parameter guaranteed by design.
©1994 Fairchild Semiconductor Corporation
74VHC27 Rev. 1.4.0
www.fairchildsemi.com
4
74VHC27 — Triple 3-Input NOR Gate
AC Electrical Characteristics
T
A
=
25°C
Symbol
Parameter
V
CC
(V)
3.3 ± 0.3
5.0 ± 0.5
C
IN
C
PD
Input Capacitance
Power Dissipation
Capacitance
T
A
=
–40°C to +85°C
Min.
1.0
1.0
1.0
1.0
Conditions
C
L
=
15pF
C
L
=
50pF
C
L
=
15pF
C
L
=
50pF
V
CC
=
Open
(3)
Min.
Typ.
6.2
8.7
4.1
5.6
4
20
Max.
8.8
12.3
5.9
7.9
10
Max.
10.5
14.0
7.0
9.0
10
Units
ns
ns
pF
pF
t
PHL
, t
PLH
Propagation Delay
Note:
3. 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
/ 3 (per gate).
©1994 Fairchild Semiconductor Corporation
74VHC27 Rev. 1.4.0
www.fairchildsemi.com
5
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