74LCX27 — Low Voltage Triple 3-Input NOR Gate with 5V Tolerant Inputs
January 2008
74LCX27
Low Voltage Triple 3-Input NOR Gate with 5V
Tolerant Inputs
Features
■
5V tolerant inputs
■
2.3V–3.6V V
CC
specifications provided
■
4.9ns t
PD
max. (V
CC
=
3.3V), 10µA I
CC
max.
■
Power down high impedance inputs and outputs
■
±24mA output drive (V
CC
=
3.0V)
■
Implements patented noise/EMI reduction circuitry
■
Latch-up performance exceeds JEDEC 78 conditions
■
ESD performance:
General Description
The LCX27 contains three 3-input NOR gates. The
inputs tolerate voltages up to 7V allowing the interface of
5V systems to 3V systems.
The 74LCX27 is fabricated with advanced CMOS tech-
nology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
– Human body model
>
2000V
– Machine model
>
200V
Ordering Information
Order Number
74LCX27M
74LCX27SJ
74LCX27MTC
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.
©2001 Fairchild Semiconductor Corporation
74LCX27 Rev. 1.3.0
www.fairchildsemi.com
74LCX27 — Low Voltage Triple 3-Input NOR Gate with 5V Tolerant Inputs
Connection Diagram
Logic Symbol
IEEE/IEC
Pin Description
Pin Names
A
n
, B
n
, C
n
O
n
Description
Inputs
Outputs
Truth Table
O
n
=
A
n
+ B
n
+ C
n
Inputs
A
n
H
X
X
L
Output
C
n
X
X
H
L
B
n
X
H
X
L
O
n
L
L
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
©2001 Fairchild Semiconductor Corporation
74LCX27 Rev. 1.3.0
www.fairchildsemi.com
2
74LCX27 — Low Voltage Triple 3-Input NOR Gate with 5V Tolerant Inputs
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
I
V
O
I
IK
I
OK
Supply Voltage
DC Input Voltage
Parameter
Rating
–0.5V to +7.0V
–0.5V to +7.0V
–0.5V to V
CC
+ 0.5V
–50mA
–50mA
+50mA
±50mA
±100mA
±100mA
–65°C to +150°C
DC Output Voltage, Output in HIGH or LOW State
(1)
DC Input Diode Current, V
I
<
GND
DC Output Diode Current
V
O
<
GND
V
O
>
V
CC
I
O
I
CC
I
GND
T
STG
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Note:
1. I
O
Absolute Maximum Rating must be observed.
Recommended Operating Conditions
(2)
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
Supply Voltage
Operating
Data Retention
V
I
V
O
I
OH
/ I
OL
Input Voltage
Parameter
Min.
2.0
1.5
0
0
Max.
3.6
3.6
5.5
V
CC
±24
±12
±8
Units
V
V
V
mA
Output Voltage, HIGH or LOW State
Output Current
V
CC
=
3.0V–3.6V
V
CC
=
2.7V–3.0V
V
CC
=
2.3V–2.7V
T
A
∆
t /
∆
V
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V–2.0V, V
CC
=
3.0V
–40
0
85
10
°C
ns / V
Note:
2. Unused inputs must be held HIGH or LOW. They may not float.
©2001 Fairchild Semiconductor Corporation
74LCX27 Rev. 1.3.0
www.fairchildsemi.com
3
74LCX27 — Low Voltage Triple 3-Input NOR Gate with 5V Tolerant Inputs
DC Electrical Characteristics
T
A
=
–40°C to +85°C
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
V
CC
(V)
2.3–2.7
2.7–3.6
2.3–2.7
2.7–3.6
2.3–3.6
2.3
2.7
3.0
Conditions
Min.
1.7
2.0
Max.
Units
V
0.7
0.8
I
OH
=
–100µA
I
OH
=
–8mA
I
OH
=
–12mA
I
OH
=
–18mA
I
OH
=
–24mA
I
OL
=
100µA
I
OL
=
8mA
I
OL
=
12mA
I
OL
=
16mA
I
OL
=
24mA
0
≤
V
I
≤
5.5V
V
I
or V
O
=
5.5V
V
I
=
V
CC
or GND
3.6V
≤
V
I
≤
5.5V
V
IH
=
V
CC
– 0.6V
V
CC
– 0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
10
10
±10
500
V
V
V
OL
LOW Level Output Voltage
2.3–3.6
2.3
2.7
3.0
V
I
I
I
OFF
I
CC
∆I
CC
Input Leakage Current
Power-Off Leakage Current
Quiescent Supply Current
Increase in I
CC
per Input
2.3–3.6
0
2.3–3.6
2.3–3.6
µA
µA
µA
µA
AC Electrical Characteristics
T
A
=
–40°C to +85°C, R
L
=
500Ω
V
CC
=
3.3V ± 0.3V,
C
L
=
50pF
Symbol
t
PHL
, t
PLH
V
CC
=
2.7V,
C
L
=
50pF
Min.
1.5
V
CC
=
2.5V ± 0.2V,
C
L
=
30pF
Min.
1.5
Parameter
Propagation Delay
Min.
1.5
Max.
4.9
1.0
Max.
5.8
Max.
5.9
Units
ns
ns
t
OSHL
, t
OSLH
Output to Output Skew
(3)
Note:
3. Skew is defined as the absolute value of the difference between the actual propagation delay for any two
separate outputs of the same device. The specification applies to any outputs switching in the same direction,
either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
©2001 Fairchild Semiconductor Corporation
74LCX27 Rev. 1.3.0
www.fairchildsemi.com
4
74LCX27 — Low Voltage Triple 3-Input NOR Gate with 5V Tolerant Inputs
Dynamic Switching Characteristics
T
A
=
25°C
Symbol
V
OLP
V
OLV
Parameter
Quiet Output Dynamic Peak V
OL
Quiet Output Dynamic Valley V
OL
V
CC
(V)
3.3
2.5
3.3
2.5
Conditions
C
L
=
50pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30pF, V
IH
=
2.5V, V
IL
=
0V
C
L
=
50pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30pF, V
IH
=
2.5V, V
IL
=
0V
Typical
0.8
0.6
–0.8
–0.6
Unit
V
V
Capacitance
Symbol
C
IN
C
OUT
C
PD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Conditions
V
CC
=
Open, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10MHz
Typical
7
8
25
Units
pF
pF
pF
©2001 Fairchild Semiconductor Corporation
74LCX27 Rev. 1.3.0
www.fairchildsemi.com
5
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