DATA SHEET
Product specification
Supersedes data of 1997 Aug 26
2003 Jun 30
INTEGRATED CIRCUITS
74HC00; 74HCT00
Quad 2-input NAND gate
2003 Jun 30 2
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
FEATURES
• Complies with JEDEC standard no. 8-1A
• ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V
• Specified from −40 to +85 °C and −40 to +125 °C.
DESCRIPTION
The 74HC00/74HCT00 are high-speed Si-gate CMOS
devices and are pin compatible with low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard no. 7A.
The 74HC00/74HCT00 provide the 2-input NAND
function.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns.
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW).
PD = CPD × VCC2 × fi × N + Σ(CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in Volts;
N = total load switching outputs;
Σ(CL × VCC2 × fo) = sum of the outputs.
2. For 74HC00 the condition is VI = GND to VCC.
For 74HCT00 the condition is VI = GND to VCC − 1.5 V.
FUNCTION TABLE
See note 1.
Note
1. H = HIGH voltage level;
L = LOW voltage level.
SYMBOL PARAMETER CONDITIONS
TYPICAL
UNIT
74HC00 74HCT00
tPHL/tPLH propagation delay nA, nB to nY CL = 15 pF; VCC = 5 V 7 10 ns
CI input capacitance 3.5 3.5 pF
CPD power dissipation capacitance per gate notes 1 and 2 22 22 pF
INPUT OUTPUT
nA nB nY
L L H
L H H
H L H
H H L
2003 Jun 30 3
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
TEMPERATURE
RANGE PINS PACKAGE MATERIAL CODE
74HC00N −40 to +125 °C 14 DIP14 plastic SOT27-1
74HCT00N −40 to +125 °C 14 DIP14 plastic SOT27-1
74HC00D −40 to +125 °C 14 SO14 plastic SOT108-1
74HCT00D −40 to +125 °C 14 SO14 plastic SOT108-1
74HC00DB −40 to +125 °C 14 SSOP14 plastic SOT337-1
74HCT00DB −40 to +125 °C 14 SSOP14 plastic SOT337-1
74HC00PW −40 to +125 °C 14 TSSOP14 plastic SOT402-1
74HCT00PW −40 to +125 °C 14 TSSOP14 plastic SOT402-1
74HC00BQ −40 to +125 °C 14 DHVQFN14 plastic SOT762-1
74HCT00BQ −40 to +125 °C 14 DHVQFN14 plastic SOT762-1
PINNING
PIN SYMBOL DESCRIPTION
1 1A data input
2 1B data input
3 1Y data output
4 2A data input
5 2B data input
6 2Y data output
7 GND ground (0 V)
8 3Y data output
9 3A data input
10 3B data input
11 4Y data output
12 4A data input
13 4B data input
14 VCC supply voltage
Fig.1 Pin configuration DIP14, SO14 and
(T)SSOP14.
handbook, halfpage
00
MNA210
1
2
3
4
5
6
7
1A
1B
1Y
2A
2B
2Y
GND
VCC
4B
4A
4Y
3B
3A
3Y
14
13
12
11
10
9
8
2003 Jun 30 4
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
Fig.2 Pin configuration DHVQFN14.
handbook, halfpage
1 14
1A VCC
7
2
3
4
5
6
1B
1Y
2A
2B
2Y
13
12
11
10
9
4B
4A
4Y
3B
3A
8
GND 3Y
MNA950
GND(1)
Top view
(1) The die substrate is attached to this pad using conductive die
attach material. It can not be used as a supply pin or input.
handbook, halfpage
MNA211
A
B
Y
Fig.3 Logic diagram (one gate).
handbook, halfpage
MNA212
1Y1A 3
1B
1
2
2Y2A 6
2B
4
5
3Y3A 8
3B
9
10
4Y4A 11
4B
12
13
Fig.4 Function diagram.
handbook, halfpage
MNA246
3&
&
&
&
2
1
6
5
4
8
10
9
11
13
12
Fig.5 IEC logic symbol.
2003 Jun 30 5
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
RECOMMENDED OPERATING CONDITIONS
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134); voltages are referenced to GND (ground = 0 V).
Note
1. For DIP14 packages: above 70 °C derate linearly with 12 mW/K.
For SO14 packages: above 70 °C derate linearly with 8 mW/K.
For SSOP14 and TSSOP14 packages: above 60 °C derate linearly with 5.5 mW/K.
For DHVQFN14 packages: above 60 °C derate linearly with 4.5 mW/K.
SYMBOL PARAMETER CONDITIONS
74HC00 74HCT00
UNIT
MIN. TYP. MAX. MIN. TYP. MAX.
VCC supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 V
VI input voltage 0 − VCC 0 − VCC V
VO output voltage 0 − VCC 0 − VCC V
Tamb operating ambient
temperature
see DC and AC
characteristics per
device
−40 +25 +125 −40 +25 +125 °C
tr, tf input rise and fall times VCC = 2.0 V − − 1000 − − − ns
VCC = 4.5 V − 6.0 500 − 6.0 500 ns
VCC = 6.0 V − − 400 − − − ns
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
VCC supply voltage −0.5 +7.0 V
IIK input diode current VI < −0.5 V or VI > VCC + 0.5 V − ±20 mA
IOK output diode current VO < −0.5 V or VO > VCC + 0.5 V − ±20 mA
IO output source or sink
current
−0.5 V < VO < VCC + 0.5 V − ±25 mA
ICC, IGND VCC or GND current − ±50 mA
Tstg storage temperature −65 +150 °C
Ptot power dissipation Tamb = −40 to +125 °C; note 1 − 500 mW
2003 Jun 30 6
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
DC CHARACTERISTICS
Type 74HC00
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
SYMBOL PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
OTHER VCC (V)
Tamb = −40 to +85 °C; note 1
VIH HIGH-level input voltage 2.0 1.5 1.2 − V
4.5 3.15 2.4 − V
6.0 4.2 3.2 − V
VIL LOW-level input voltage 2.0 − 0.8 0.5 V
4.5 − 2.1 1.35 V
6.0 − 2.8 1.8 V
VOH HIGH-level output voltage VI = VIH or VIL
IO = −20 µA 2.0 1.9 2.0 − V
IO = −20 µA 4.5 4.4 4.5 − V
IO = −20 µA 6.0 5.9 6.0 − V
IO = −4.0 mA 4.5 3.84 4.32 − V
IO = −5.2 mA 6.0 5.34 5.81 − V
VOL LOW-level output voltage VI = VIH or VIL
IO = 20 µA 2.0 − 0 0.1 V
IO = 20 µA 4.5 − 0 0.1 V
IO = 20 µA 6.0 − 0 0.1 V
IO = 4.0 mA 4.5 − 0.15 0.33 V
IO = 5.2 mA 6.0 − 0.16 0.33 V
ILI input leakage current VI = VCC or GND 6.0 − − ±1.0 µA
IOZ 3-state output OFF current VI = VIH or VIL;
VO = VCC or GND
6.0 − − ±.5.0 µA
ICC quiescent supply current VI = VCC or GND; IO = 0 6.0 − − 20 µA
2003 Jun 30 7
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
Note
1. All typical values are measured at Tamb = 25 °C.
Tamb = −40 to +125 °C
VIH HIGH-level input voltage 2.0 1.5 − − V
4.5 3.15 − − V
6.0 4.2 − − V
VIL LOW-level input voltage 2.0 − − 0.5 V
4.5 − − 1.35 V
6.0 − − 1.8 V
VOH HIGH-level output voltage VI = VIH or VIL
IO = −20 µA 2.0 1.9 − − V
IO = −20 µA 4.5 4.4 − − V
IO = −20 µA 6.0 5.9 − − V
IO = −4.0 mA 4.5 3.7 − − V
IO = −5.2 mA 6.0 5.2 − − V
VOL LOW-level output voltage VI = VIH or VIL
IO = 20 µA 2.0 − − 0.1 V
IO = 20 µA 4.5 − − 0.1 V
IO = 20 µA 6.0 − − 0.1 V
IO = 4.0 mA 4.5 − − 0.4 V
IO = 5.2 mA 6.0 − − 0.4 V
ILI input leakage current VI = VCC or GND 6.0 − − ±1.0 µA
IOZ 3-state output OFF current VI = VIH or VIL;
VO = VCC or GND
6.0 − − ±10.0 µA
ICC quiescent supply current VI = VCC or GND; IO = 0 6.0 − − 40 µA
SYMBOL PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
OTHER VCC (V)
2003 Jun 30 8
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
Type 74HCT00
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Note
1. All typical values are measured at Tamb = 25 °C.
SYMBOL PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
OTHER VCC (V)
Tamb = −40 to +85 °C; note 1
VIH HIGH-level input voltage 4.5 to 5.5 2.0 1.6 − V
VIL LOW-level input voltage 4.5 to 5.5 − 1.2 0.8 V
VOH HIGH-level output voltage VI = VIH or VIL
IO = −20 µA 4.5 4.4 4.5 − V
IO = −4.0 mA 4.5 3.84 4.32 − V
VOL LOW-level output voltage VI = VIH or VIL
IO = 20 µA 4.5 − 0 0.1 V
IO = 4.0 mA 4.5 − 0.15 0.33 V
ILI input leakage current VI = VCC or GND 5.5 − − ±1.0 µA
IOZ 3-state output OFF current VI = VIH or VIL;
VO = VCC or GND;
IO = 0
5.5 − − ±5.0 µA
ICC quiescent supply current VI = VCC or GND;
IO = 0
5.5 − − 20 µA
∆ICC additional supply current per input VI = VCC − 2.1 V;
IO = 0
4.5 to 5.5 − 150 675 µA
Tamb = −40 to +125 °C
VIH HIGH-level input voltage 4.5 to 5.5 2.0 − − V
VIL LOW-level input voltage 4.5 to 5.5 − − 0.8 V
VOH HIGH-level output voltage VI = VIH or VIL
IO = −20 µA 4.5 4.4 − − V
IO = −4.0 mA 4.5 3.7 − − V
VOL LOW-level output voltage VI = VIH or VIL
IO = 20 µA 4.5 − − 0.1 V
IO = 4.0 mA 4.5 − − 0.4 V
ILI input leakage current VI = VCC or GND 5.5 − − ±1.0 µA
IOZ 3-state output OFF current VI = VIH or VIL;
VO = VCC or GND;
IO = 0
5.5 − − ±10 µA
ICC quiescent supply current VI = VCC or GND;
IO = 0
5.5 − − 40 µA
∆ICC additional supply current per input VI = VCC − 2.1 V;
IO = 0
4.5 to 5.5 − − 735 µA
2003 Jun 30 9
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
AC CHARACTERISTICS
Type 74HC00
GND = 0 V; tr = tf = 6 ns; CL = 50 pF.
Note
1. All typical values are measured at Tamb = 25 °C.
Type 74HCT00
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Note
1. All typical values are measured at Tamb = 25 °C.
SYMBOL PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
WAVEFORMS VCC (V)
Tamb = −40 to +85 °C; note 1
tPHL/tPLH propagation delay nA, nB to nY see Fig.6 2.0 − 25 115 ns
see Fig.6 4.5 − 9 23 ns
see Fig.6 6.0 − 7 20 ns
tTHL/tTLH output transition time 2.0 − 19 95 ns
4.5 − 7 19 ns
6.0 − 6 16 ns
Tamb = −40 to +125 °C
tPHL/tPLH propagation delay nA, nB to nY see Fig.6 2.0 − − 135 ns
see Fig.6 4.5 − − 27 ns
see Fig.6 6.0 − − 23 ns
tTHL/tTLH output transition time 2.0 − − 110 ns
4.5 − − 22 ns
6.0 − − 19 ns
SYMBOL PARAMETER
TEST CONDITIONS
MIN. TYP MAX. UNIT
WAVEFORMS VCC (V)
Tamb = −40 to +85 °C; note 1
tPHL/tPLH propagation delay nA, nB to nY see Fig.6 4.5 − 12 24 ns
tTHL/tTLH output transition time 4.5 − − 29 ns
Tamb = −40 to +125 °C
tPHL/tPLH propagation delay nA, nB to nY see Fig.6 4.5 − − 29 ns
tTHL/tTLH output transition time 4.5 − − 22 ns
2003 Jun 30 10
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
AC WAVEFORMS
handbook, halfpage
MNA218
tPHL
tTHL tTLH
tPLH
VM
VMnA, nB input
nY output
GND
VI
VOH
VOL
Fig.6 Waveforms showing the input (nA, nB) to output (nY) propagation delays.
74HC00: VM = 50%; VI = GND to VCC.
74HCT00: VM = 1.3 V; VI = GND to 3 V.
2003 Jun 30 11
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
PACKAGE OUTLINES
UNIT Amax.
1 2 (1) (1)b1 c D
(1)ZE e MHL
REFERENCESOUTLINE
VERSION
EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
SOT27-1 99-12-2703-02-13
A
min.
A
max. b max.wMEe1
1.73
1.13
0.53
0.38
0.36
0.23
19.50
18.55
6.48
6.20
3.60
3.05 0.2542.54 7.62
8.25
7.80
10.0
8.3 2.24.2 0.51 3.2
0.068
0.044
0.021
0.015
0.77
0.73
0.014
0.009
0.26
0.24
0.14
0.12 0.010.1 0.3
0.32
0.31
0.39
0.33 0.0870.17 0.02 0.13
050G04 MO-001 SC-501-14
MH
c
(e )1
ME
A
L
se
a
tin
g
pl
an
e
A1
w M
b1
e
D
A2
Z
14
1
8
7
b
E
pin 1 index
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
DIP14: plastic dual in-line package; 14 leads (300 mil) SOT27-1
2003 Jun 30 12
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
UNIT Amax. A1 A2 A3 bp c D
(1) E(1) (1)e HE L Lp Q Zywv q
REFERENCESOUTLINE
VERSION
EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
1.75 0.250.10
1.45
1.25 0.25
0.49
0.36
0.25
0.19
8.75
8.55
4.0
3.8 1.27
6.2
5.8
0.7
0.6
0.7
0.3 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
1.0
0.4
SOT108-1
X
w M
q
AA1
A2
bp
D
HE
Lp
Q
detail X
E
Z
e
c
L
v M A
(A )3
A
7
8
1
14
y
076E06 MS-012
pin 1 index
0.069 0.0100.004
0.057
0.049 0.01
0.019
0.014
0.0100
0.0075
0.35
0.34
0.16
0.15 0.05
1.05
0.0410.2440.228
0.028
0.024
0.028
0.0120.01
0.25
0.01 0.0040.0390.016
99-12-27
03-02-19
0 2.5 5 mm
scale
SO14: plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
2003 Jun 30 13
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
UNIT A1 A2 A3 bp c D(1) E (1) e HE L Lp Q Zywv q
REFERENCESOUTLINE
VERSION
EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.210.05
1.80
1.65 0.25
0.38
0.25
0.20
0.09
6.4
6.0
5.4
5.2 0.65 1.25 0.2
7.9
7.6
1.03
0.63
0.9
0.7
1.4
0.9
8
0
o
o0.13 0.1
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
SOT337-1 99-12-2703-02-19
(1)
w M
bp
D
HE
E
Z
e
c
v M A
X
A
y
1 7
14 8
q
AA1
A2
Lp
Q
detail X
L
(A )3
MO-150
pin 1 index
0 2.5 5 mm
scale
SSOP14: plastic shrink small outline package; 14 leads; body width 5.3 mm SOT337-1
A
max.
2
2003 Jun 30 14
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
UNIT A1 A2 A3 bp c D (1) E (2) (1)e HE L Lp Q Zywv q
REFERENCESOUTLINE
VERSION
EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.150.05
0.95
0.80
0.30
0.19
0.2
0.1
5.1
4.9
4.5
4.3 0.65
6.6
6.2
0.4
0.3
0.72
0.38
8
0
o
o0.13 0.10.21
DIMENSIONS (mm are the original dimensions)
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
0.75
0.50
SOT402-1 MO-153 99-12-2703-02-18
w M
bp
D
Z
e
0.25
1 7
14 8
q
AA1
A2
Lp
Q
detail X
L
(A )3
HE
E
c
v M A
X
A
y
0 2.5 5 mm
scale
TSSOP14: plastic thin shrink small outline package; 14 leads; body width 4.4 mm SOT402-1
A
max.
1.1
pin 1 index
2003 Jun 30 15
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
terminal 1
index area
0.51
A1 EhbUNIT ye
0.2
c
REFERENCESOUTLINE
VERSION
EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 3.12.9
Dh
1.65
1.35
y1
2.6
2.4
1.15
0.85
e1
20.300.18
0.05
0.00 0.05 0.1
DIMENSIONS (mm are the original dimensions)
SOT762-1 MO-241 - - -- - -
0.5
0.3
L
0.1
v
0.05
w
0 2.5 5 mm
scale
SOT762-1
DHVQFN14: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads;
14 terminals; body 2.5 x 3 x 0.85 mm
A(1)
max.
A
A1
c
detail X
yy1 Ce
L
Eh
Dh
e
e1
b
2 6
13 9
8
71
14
X
D
E
C
B A
02-10-17
03-01-27
terminal 1
index area
AC
C
Bv M
w M
E(1)
Note
1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.
D(1)
2003 Jun 30 16
Philips Semiconductors Product specification
Quad 2-input NAND gate 74HC00; 74HCT00
DATA SHEET STATUS
Notes
1. Please consult the most recently issued data sheet before initiating or completing a design.
2. The product status of the device(s) described in this data sheet may have changed since this data sheet was
published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.
3. For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
LEVEL DATA SHEETSTATUS(1)
PRODUCT
STATUS(2)(3) DEFINITION
I Objective data Development This data sheet contains data from the objective specification for product
development. Philips Semiconductors reserves the right to change the
specification in any manner without notice.
II Preliminary data Qualification This data sheet contains data from the preliminary specification.
Supplementary data will be published at a later date. Philips
Semiconductors reserves the right to change the specification without
notice, in order to improve the design and supply the best possible
product.
III Product data Production This data sheet contains data from the product specification. Philips
Semiconductors reserves the right to make changes at any time in order
to improve the design, manufacturing and supply. Relevant changes will
be communicated via a Customer Product/Process Change Notification
(CPCN).
DEFINITIONS
Short-form specification The data in a short-form
specification is extracted from a full data sheet with the
same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition Limiting values given are in
accordance with the Absolute Maximum Rating System
(IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device.
These are stress ratings only and operation of the device
at these or at any other conditions above those given in the
Characteristics sections of the specification is not implied.
Exposure to limiting values for extended periods may
affect device reliability.
Application information Applications that are
described herein for any of these products are for
illustrative purposes only. Philips Semiconductors make
no representation or warranty that such applications will be
suitable for the specified use without further testing or
modification.
DISCLAIMERS
Life support applications These products are not
designed for use in life support appliances, devices, or
systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips
Semiconductors customers using or selling these products
for use in such applications do so at their own risk and
agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes Philips Semiconductors
reserves the right to make changes in the products -
including circuits, standard cells, and/or software -
described or contained herein in order to improve design
and/or performance. When the product is in full production
(status ‘Production’), relevant changes will be
communicated via a Customer Product/Process Change
Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these
products, conveys no licence or title under any patent,
copyright, or mask work right to these products, and
makes no representations or warranties that these
products are free from patent, copyright, or mask work
right infringement, unless otherwise specified.
© Koninklijke Philips Electronics N.V. 2003 SCA75
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Philips Semiconductors – a worldwide company
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Printed in The Netherlands 613508/03/pp17 Date of release: 2003 Jun 30 Document order number: 9397 750 11258
FEATURES
DESCRIPTION
QUICK REFERENCE DATA
FUNCTION TABLE
ORDERING INFORMATION
PINNING
RECOMMENDED OPERATING CONDITIONS
LIMITING VALUES
DC CHARACTERISTICS
AC CHARACTERISTICS
AC WAVEFORMS
PACKAGE OUTLINES
SOT27-1
SOT108-1
SOT337-1
SOT402-1
SOT762-1
DATA SHEET STATUS
DEFINITIONS
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