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SN54LVC74A, SN74LVC74A
SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
SNx4LVC74A Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset
1 Features
3 Description
•
•
•
•
The SNx4LVC74A devices integrate two positiveedge triggered D-type flip-flops in one convenient
device.
1
•
•
•
Operate From 1.65 V to 3.6 V
Inputs Accept Voltages to 5.5 V
Maximum tpd of 5.2 ns at 3.3 V
Typical VOLP (Output Ground Bounce)
2 V at VCC = 3.3 V, TA = 25°C
Latch-Up Performance Exceeds 250 mA Per
JESD 17
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 1000-V Charged-Device Model (C101)
2 Applications
•
•
•
•
•
•
•
•
•
•
Servers
Medical, Healthcare, and Fitness
Telecom Infrastructures
TVs, Set-Top Boxes, and Audio
Test and Measurement
Industrial Transport
Wireless Infrastructure
Enterprise Switching
Motor Drives
Factory Automation and Control
The SN54LVC74A is designed for 2.7-V to 3.6-V VCC
operation, and the SN74LVC74A is designed for
1.65-V to 3.6-V VCC operation.
A low level at the preset (PRE) or clear (CLR) inputs
sets or resets the outputs, regardless of the levels of
the other inputs. When PRE and CLR are inactive
(high), data at the data (D) input meeting the setup
time requirements is transferred to the outputs on the
positive-going edge of the clock pulse. Clock
triggering occurs at a voltage level and is not directly
related to the rise time of the clock pulse. Following
the hold-time interval, data at the D input can be
changed without affecting the levels at the outputs.
The data I/Os and control inputs are overvoltage
tolerant. This feature allows the use of these devices
for down-translation in a mixed-voltage environment.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SNJ54LVC74AFK
LCCC (20)
8.89 mm × 8.89 mm
SNJ54LVC74AJ
CDIP (14)
19.56 mm × 6.67 mm
SNJ54LVC74AW
CFP (14)
9.21 mm × 5.97 mm
SN74LVC74AD
SOIC (14)
8.65 mm × 3.91 mm
SN74LVC74ADB
SSOP (14)
6.20 mm × 5.30 mm
SN74LVC74ANS
SO (14)
10.30 mm × 5.30 mm
SN74LVC74APW
TSSOP (14)
5.00 mm × 4.40 mm
SN74LVC74ARGY
VQFN (14)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Logic Diagram, Each Flip-Flop (Positive Logic)
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
On products compliant to MIL-PRF-38535, all parameters are
tested unless otherwise noted. On all other products, production
SN54LVC74A, SN74LVC74A
SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
Absolute Maximum Ratings ...................................... 4
ESD Ratings.............................................................. 4
Recommended Operating Conditions....................... 4
Thermal Information: SN74LVC74A ......................... 5
Electrical Characteristics........................................... 5
Timing Requirements: SN54LVC74A ....................... 6
Timing Requirements: SN74LVC74A ....................... 6
Timing Requirements: SN74LVC74A, –40°C to
125°C and –40°C to 85°C.......................................... 7
6.9 Switching Characteristics: SN54LVC74A ................. 7
6.10 Switching Characteristics: SN74LVC74A ............... 7
6.11 Switching Characteristics: SN74LVC74A, –40°C to
125°C and –40°C to 85°C.......................................... 8
6.12 Operating Characteristics........................................ 8
6.13 Typical Characteristics ............................................ 8
7
Parameter Measurement Information .................. 9
8
Detailed Description ............................................ 10
8.1
8.2
8.3
8.4
9
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
10
10
10
10
Application and Implementation ........................ 11
9.1 Application Information............................................ 11
9.2 Typical Application ................................................. 11
10 Power Supply Recommendations ..................... 13
11 Layout................................................................... 13
11.1 Layout Guidelines ................................................. 13
11.2 Layout Example .................................................... 13
12 Device and Documentation Support ................. 14
12.1
12.2
12.3
12.4
12.5
12.6
12.7
Documentation Support ........................................
Related Links ........................................................
Receiving Notification of Documentation Updates
Community Resource............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
14
14
14
14
14
14
14
13 Mechanical, Packaging, and Orderable
Information ........................................................... 14
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision T (July 2013) to Revision U
Page
•
Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
•
Changed Package thermal impedance, RθJA, values in Thermal Information: SN74LVC74A From: 86 To: 93.7 (D),
From: 96 To: 107.3 (DB), From: 76 To: 90.3 (NS), From: 113 To: 121.7 (PW), and From: 47 To: 54.9 (RGY).................... 5
Changes from Revision S (May 2005) to Revision T
•
2
Page
Extended maximum temperature operating range from 85°C to 125°C................................................................................. 4
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Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
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SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
5 Pin Configuration and Functions
D, DB, J, PW, NS, or W Package
14-Pin SOIC, SSOP, CDIP, TSSOP, SO, or CFP
Top View
VCC
2CLR
1CLK
3
12
2D
1PRE
4
11
2CLK
1Q
5
10
2PRE
1Q
6
9
2Q
GND
7
8
2Q
1D
1CLK
1PRE
1Q
1Q
VCC
13
1
14
2
13 2CLR
3
12 2D
2CLK
4
11
5
10 2PRE
9 2Q
6
Not to scale
7
8
2Q
14
2
1CLR
1
1D
GND
1CLR
RGY Package
14-Pin VQFN With Exposed Thermal Pad
Top View
1D
1CLR
NC
VCC
2CLR
3
2
1
20
19
FK Package
20-Pin LCCC
Top View
1PRE
6
16
2CLK
NC
7
15
NC
1Q
8
14
2PRE
2Q
2Q
NC
GND
1Q
13
NC
12
2D
17
11
18
5
10
4
NC
9
1CLK
Not to scale
Pin Functions
PIN
I/O
DESCRIPTION
NAME
CDIP, CFP, PDIP, SO, SOIC,
SSOP, TSSOP, VQFN
LCCC
1CLK
3
4
I
Channel 1 clock input
1CLR
1
2
I
Channel 1 clear input. Pull low to set Q output low.
1D
2
3
I
Channel 1 data input
1PRE
4
6
I
Channel 1 preset input. Pull low to set Q output high.
1Q
5
8
O
Channel 1 output
1Q
6
9
O
Channel 1 inverted output
2CLK
11
16
I
Channel 2 clock input
2CLR
13
19
I
Channel 2 clear input. Pull low to set Q output low.
2D
12
18
I
Channel 2 data input
2PRE
10
14
I
Channel 2 preset input. Pull low to set Q output high.
2Q
9
13
O
Channel 2 output
2Q
8
12
O
Channel 2 Inverted output
GND
7
10
—
Ground
NC
—
1, 5, 7, 11, 15, 17
—
No connect
VCC
14
20
—
Supply
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
Supply voltage, VCC
Input voltage, VI
(2)
Output voltage, VO (2) (3)
MIN
MAX
UNIT
–0.5
6.5
V
–0.5
6.5
V
–0.5
VCC + 0.5
V
Input clamp current, IIK
VI < 0
–50
mA
Output clamp current, IOK
VO < 0
–50
mA
Continuous output current, IO
±50
mA
Continuous current through VCC or GND
±100
mA
150
°C
Storage temperature, Tstg
(1)
(2)
(3)
–65
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
The value of VCC is provided in Recommended Operating Conditions.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±2000
Charged-device model (CDM), per JEDEC specification JESD22-C101 (2)
±1000
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
see (1)
VCC
Supply voltage
Operating
MIN
MAX
SN54LVC74A
2
3.6
SN74LVC74A
1.65
3.6
Data retention only
VIH
High-level input voltage
Low-level input voltage
VCC = 1.65 V to 1.95 V
SN74LVC74A
0.65 × VCC
VCC = 2.3 V to 2.7 V
SN74LVC74A
1.7
Input voltage
VO
Output voltage
IOH
High-level output current
VCC = 1.65 V to 1.95 V
SN74LVC74A
0.35 × VCC
VCC = 2.3 V to 2.7 V
SN74LVC74A
0.7
Low-level output current
Δt/Δv
Input transition rise or fall rate
(1)
4
V
0.8
0
5.5
V
0
VCC
V
VCC = 1.65 V
SN74LVC74A
–4
VCC = 2.3 V
SN74LVC74A
–8
VCC = 2.7 V
–12
VCC = 3 V
IOL
V
2
VCC = 2.7 V to 3.6 V
VI
V
1.5
VCC = 2.7 V to 3.6 V
VIL
UNIT
mA
–24
VCC = 1.65 V
SN74LVC74A
VCC = 2.3 V
SN74LVC74A
4
8
VCC = 2.7 V
12
VCC = 3 V
24
10
mA
ns/V
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. See the TI application report,
Implications of Slow or Floating CMOS Inputs (SCBA004).
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SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
Recommended Operating Conditions (continued)
see(1)
TA
Operating free-air temperature
MIN
MAX
SN54LVC74A
–55
125
SN74LVC74A
–40
125
UNIT
°C
6.4 Thermal Information: SN74LVC74A
SN74LVC74A
THERMAL METRIC
(1)
D
(SOIC)
DB
(SSOP)
NS
(SO)
PW
(TSSOP)
RGY
(VQFN)
UNIT
14 PINS
14 PINS
14 PINS
14 PINS
14 PINS
RθJA
Junction-to-ambient thermal resistance
93.7
107.3
90.3
121.7
54.9
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
54.8
59.2
48.1
50.3
52.2
°C/W
RθJB
Junction-to-board thermal resistance
48
54.6
49.1
63.4
30.8
°C/W
ψJT
Junction-to-top characterization parameter
20.3
24.1
17.9
6.2
2.4
°C/W
ψJB
Junction-to-board characterization parameter
47.7
54.1
48.8
62.8
30.9
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
—
—
—
—
12.5
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = –100 µA
VOH
High-level output voltage
VCC – 0.2
VCC = 2.7 V to 3.6 V and TA = –40°C to
125°C (SN74LVC74A only)
VCC – 0.2
IOH = –4 mA, VCC = 1.65 V, and TA = –40°C to 125°C
(SN74LVC74A only)
1.2
IOH = –8 mA, VCC = 2.3 V, and TA = –40°C to 125°C
(SN74LVC74A only)
1.7
IOH = –12 mA
IOL = 100 µA
Low-level output voltage
TYP
MAX
UNIT
V
VCC = 2.7 V
2.2
VCC = 3 V
2.4
IOH = –24 mA, VCC = 3 V
VOL
MIN
VCC = 1.65 V to 3.6 V and TA = –55°C to
125°C (SN54LVC74A only)
2.2
VCC = 1.65 V to 3.6 V, and TA = –40°C
to 125°C (SN74LVC74A only)
0.2
VCC = 2.7 V to 3.6 V and TA = –55°C to
125°C (SN54LVC74A only)
0.2
IOL = 4 mA, VCC = 1.65 V, and TA = –40°C to 125°C
(SN74LVC74A only)
0.45
IOL = 8 mA, VCC = 2.3 V, and TA = –40°C to 125°C
(SN74LVC74A only)
0.7
IOL = 12 mA, VCC = 2.7 V
V
0.4
IOL = 24 mA, VCC = 3 V
0.55
II
Input current
VI = 5.5 V or GND, VCC = 3.6 V
±5
µA
ICC
Supply current
VI = VCC or GND, IO = 0, VCC = 3.6 V
10
µA
ΔICC
Change in supply current
One input at VCC – 0.6 V, other inputs at VCC or GND, and
VCC = 2.7 V to 3.6 V
500
µA
Ci
Input capacitance
VI = VCC or GND, VCC = 3.3 V, TA = 25°C
Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
5
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5
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6.6 Timing Requirements: SN54LVC74A
over recommended operating free-air temperature range (unless otherwise noted; see Figure 3)
MIN
fclock
Clock frequency
tw
Pulse duration
VCC = 2.7 V
tsu
100
PRE or CLR low
3.3
CLK high or low
3.3
Setup time before CLK↑
PRE or CLR inactive
th
83
VCC = 3.3 V ± 0.3 V
Data
MAX
VCC = 2.7 V
UNIT
MHz
ns
3.4
VCC = 3.3 V ± 0.3 V
3
VCC = 2.7 V
ns
2.2
VCC = 3.3 V ± 0.3 V
2
Hold time, data after CLK↑
1
ns
6.7 Timing Requirements: SN74LVC74A
over recommended operating free-air temperature range (unless otherwise noted; see Figure 3)
MIN
fclock
Clock frequency
VCC = 1.8 V or 2.5 V
PRE or CLR low
tw
Pulse duration
CLK high or low
Data
tsu
Setup time before CLK↑
PRE or CLR inactive
th
6
Hold time, data after CLK↑
VCC = 1.8 V ± 0.15 V
4.1
VCC = 2.5 V ± 0.2 V
3.3
VCC = 1.8 V ± 0.15 V
4.1
VCC = 2.5 V ± 0.2 V
3.3
VCC = 1.8 V ± 0.15 V
3.6
VCC = 2.5 V ± 0.2 V
2.3
VCC = 1.8 V ± 0.15 V
2.7
VCC = 2.5 V ± 0.2 V
1.9
VCC = 1.8 V or 2.5 V
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1
MAX
UNIT
83
MHz
ns
ns
ns
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6.8 Timing Requirements: SN74LVC74A, –40°C to 125°C and –40°C to 85°C
over recommended operating free-air temperature range (unless otherwise noted; see Figure 3)
MIN
fclock
Clock frequency
VCC = 2.7 V
TA = –40°C to
125°C
Pulse duration
100
VCC = 2.7 V or 3.3 V
3.3
CLK high or low
VCC = 2.7 V or 3.3 V
3.3
TA = –40°C to 125°C
tsu
VCC = 2.7 V
TA = –40°C to 125°C
PRE or CLR
inactive
3
VCC = 2.7 V
3
th
ns
2.2
VCC = 3.3 V ± 0.3 V
2
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
Hold time, data after
CLK↑
ns
3.4
VCC = 3.3 V ± 0.3 V
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
Setup time before CLK↑
MHz
150
PRE or CLR low
Data
UNIT
83
VCC = 3.3 V ± 0.3 V
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
tw
MAX
2
VCC = 2.7 V or 3.3 V
1
ns
6.9 Switching Characteristics: SN54LVC74A
over recommended operating free-air temperature range (unless otherwise noted; see Figure 3)
PARAMETER
fmax
Maximum clock
frequency
FROM
(INPUT)
TO
(OUTPUT)
—
—
MIN
VCC = 2.7 V
Propagation (delay)
time
Q or Q
PRE or CLR
MAX
83
VCC = 3.3 V ± 0.3 V
UNIT
MHz
100
VCC = 2.7 V
CLK
tpd
TEST CONDITIONS
6
VCC = 2.7 V
1
VCC = 3.3 V ± 0.3 V
5.2
6.4
VCC = 3.3 V ± 0.3 V
1
5.4
MIN
MAX
ns
6.10 Switching Characteristics: SN74LVC74A
over recommended operating free-air temperature range (unless otherwise noted; see Figure 3)
PARAMETER
fmax
Maximum clock
frequency
FROM
(INPUT)
TO
(OUTPUT)
—
—
CLKPRE
tpd
Propagation (delay)
time
Q or Q
or CLR
TEST CONDITIONS
83
MHz
VCC = 1.8 V ± 0.15 V
1
7.1
VCC = 2.5 V ± 0.2 V
1
4.4
VCC = 1.8 V ± 0.15 V
1
6.9
VCC = 2.5 V ± 0.2 V
1
4.6
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UNIT
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ns
7
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6.11 Switching Characteristics: SN74LVC74A, –40°C to 125°C and –40°C to 85°C
over recommended operating free-air temperature range (unless otherwise noted; see Figure 3)
PARAMETER
fmax
FROM
(INPUT)
TO
(OUTPUT)
—
—
Maximum clock
frequency
TEST CONDITIONS
MIN
VCC = 2.7 V
TA = –40°C to 125°C
100
Propagation (delay)
time
tpd
Q or Q
1
5.2
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
VCC = 2.7 V
Skew (time), output
—
—
1
5.2
1
6.4
VCC = 3.3 V ± 0.3 V
ns
5.4
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
tsk(o)
6
VCC = 3.3 V ± 0.3 V
TA = –40°C to 125°C
PRE or CLR
MHz
150
VCC = 2.7 V
TA = –40°C to 125°C
UNIT
83
VCC = 3.3 V ± 0.3 V
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
CLK
MAX
1
5.4
TA = –40°C to 85°C and VCC = 3.3 V ± 0.3 V
1
ns
6.12 Operating Characteristics
TA = 25°C
PARAMETER
Cpd
Power dissipation capacitance per flip-flop
TEST CONDITIONS
TYP
VCC = 1.8 V
24
VCC = 2.5 V
24
VCC = 3.3 V
26
f = 10 MHz
UNIT
pF
6.13 Typical Characteristics
10
14
12
VCC = 3 V,
TA = 25°C
tpd – Propagation Delay Time – ns
tpd – Propagation Delay Time – ns
VCC = 3 V,
TA = 25°C
One Output Switching
Four Outputs Switching
Eight Outputs Switching
10
8
6
4
6
4
2
2
0
50
100
150
200
250
300
CL – Load Capacitance – pF
Figure 1. Propagation Delay (Low-to-High Transition)
vs Load Capacitance
8
One Output Switching
Four Outputs Switching
Eight Outputs Switching
8
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0
50
100
150
200
250
300
CL – Load Capacitance – pF
Figure 2. Figure 2. Propagation Delay (High-to-Low
Transition) vs Load Capacitance
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7 Parameter Measurement Information
VLOAD
S1
RL
From Output
Under Test
CL
(see Note A)
Open
GND
RL
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
VLOAD
GND
LOAD CIRCUIT
INPUTS
VCC
1.8 V ± 0.15 V
2.5 V ± 0.2 V
2.7 V
3.3 V ± 0.3 V
VI
tr/tf
VCC
VCC
2.7 V
2.7 V
≤2 ns
≤2 ns
≤2.5 ns
≤2.5 ns
VM
VLOAD
CL
RL
VΔ
VCC/2
VCC/2
1.5 V
1.5 V
2 × VCC
2 × VCC
6V
6V
30 pF
30 pF
50 pF
50 pF
1 kΩ
500 Ω
500 Ω
500 Ω
0.15 V
0.15 V
0.3 V
0.3 V
VI
Timing Input
VM
0V
tw
tsu
VI
Input
VM
th
VI
VM
Data Input
VM
VM
0V
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATION
VI
VM
Input
0V
VOH
VM
Output
VM
VOL
VM
0V
VLOAD/2
VM
VOL + VΔ
tPZH
VOH
Output
VM
tPLZ
Output
Waveform 1
S1 at VLOAD
(see Note B)
tPLH
tPHL
VM
tPZL
tPHL
tPLH
VI
Output
Control
VM
VM
VOL
tPHZ
Output
Waveform 2
S1 at GND
(see Note B)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VM
VOH – VΔ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
CL includes probe and jig capacitance.
B.
Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output
control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output
control.
C.
All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω.
D.
The outputs are measured one at a time, with one transition per measurement.
E.
tPLZ and tPHZ are the same as tdis.
tPZL and tPZH are the same as ten.
G.
tPLH and tPHL are the same as tpd.
H.
All parameters and waveforms are not applicable to all devices.
VOH
≈0 V
A.
F.
VOL
Figure 3. Load Circuit and Voltage Waveforms
Copyright © 1993–2017, Texas Instruments Incorporated
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8 Detailed Description
8.1 Overview
The SNx4LVC74A devices feature two independent positive-edge triggered D flip-flops. Integrated preset (PRE)
and clear (CLR) functions allow for easy setup and control during operation.
The SN54LVC74A device is specified from –55°C to 125°C, and the SN74LVC74A device is specified from
–40°C to 125°C.
8.2 Functional Block Diagram
Copyright © 2016, Texas Instruments Incorporated
8.3 Feature Description
A low level at the preset (PRE) or clear (CLR) inputs sets or resets the outputs, regardless of the levels of the
other inputs. When PRE and CLR are inactive (high), data at the data (D) input meeting the setup time
requirements is transferred to the outputs on the positive-going edge of the clock pulse. Clock triggering occurs
at a voltage level and is not directly related to the rise time of the clock pulse. Following the hold-time interval,
data at the D input can be changed without affecting the levels at the outputs.
8.4 Device Functional Modes
Table 1 describes the SNx4LVC74A functionality and interactions between the PRE, CLR, CLK, and D inputs.
Table 1. Function Table
INPUTS
(1)
10
OUTPUTS
PRE
CLR
CLK
D
Q
Q
L
H
X
X
H
L
H
L
X
X
L
H
L
L
X
X
H (1)
H (1)
H
H
↑
H
H
L
H
H
↑
L
L
H
H
H
L
X
Q0
Q0
This configuration is nonstable; that is, it does not persist when PRE
or CLR returns to its inactive (high) level.
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Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
SN54LVC74A, SN74LVC74A
www.ti.com
SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
A common application for the SN74LVC74A is a frequency divider. By connecting the Q output to the D input, the
Q output toggles states on each positive edge of the incoming clock signal. Because it takes two positive edges,
or two clock pulses, to complete one complete pulse on the output (one pulse to toggle from low to high, another
to toggle from high to low), the incoming clock frequency is effectively divided by two.
9.2 Typical Application
3V
Clock Input
VCC
Q
1D
Q
1CLK
Output
GND
SN74LVC74A
Copyright © 2016, Texas Instruments Incorporated
Figure 4. Frequency Divider
9.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Avoid bus contention because it can drive
currents in excess of maximum limits. The high drive also creates fast edges into light loads, so consider routing
and load conditions to prevent ringing.
9.2.2 Detailed Design Procedure
1. Recommended input conditions:
– For rise time and fall time specification, see (Δt/ΔV) in Recommended Operating Conditions.
– For specified high and low levels, see (VIH and VIL) in Recommended Operating Conditions.
– Inputs are overvoltage tolerant allowing them to go as high as (VI max) in Recommended Operating
Conditions at any valid VCC.
2. Recommended maximum output conditions:
– Load currents must not exceed (IO max) per output and must not exceed (Continuous current through VCC
or GND) total current for the part. These limits are located in Absolute Maximum Ratings.
– Outputs must not be pulled above VCC.
Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
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Typical Application (continued)
9.2.3 Application Curves
60
100
80
TA = 25°C, VCC = 3 V,
VIH = 3 V, VIL = 0 V,
All Outputs Switching
40
TA = 25°C, VCC = 3 V,
VIH = 3 V, VIL = 0 V,
All Outputs Switching
20
I OH – mA
I OL – mA
60
40
0
–20
–40
20
–60
0
–80
–20
–0.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
VOL – V
Figure 5. Output Drive Current (IOL)
vs LOW-level Output Voltage (VOL)
12
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1.4
1.6
–100
–1
–0.5 0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
VOH – V
Figure 6. Output Drive Current (IOH)
vs HIGH-level Output Voltage (VOH)
Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
SN54LVC74A, SN74LVC74A
www.ti.com
SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
10 Power Supply Recommendations
The power supply may be any voltage between the minimum and maximum supply voltage rating located in
Recommended Operating Conditions.
Each VCC terminal must have a good bypass capacitor to prevent power disturbance. A 0.1-µF capacitor is
recommended for devices with a single supply. If there are multiple VCC terminals, then 0.01-µF or 0.022-µF
capacitors are recommended for each power terminal. It is permissible to parallel multiple bypass capacitors to
reject different frequencies of noise. Multiple bypass capacitors may be paralleled to reject different frequencies
of noise. The bypass capacitor must be installed as close to the power terminal as possible for the best results.
11 Layout
11.1 Layout Guidelines
Inputs must not float when using multiple bit logic devices. In many cases, functions or parts of functions of
digital logic devices are unused. Some examples include situations when only two inputs of a triple-input AND
gate are used, or when only 3 of the 4-buffer gates are used. Such input pins must not be left unconnected
because the undefined voltages at the outside connections result in undefined operational states.
Specified in Figure 7 are rules that must be observed under all circumstances. All unused inputs of digital logic
devices must be connected to a high or low bias to prevent them from floating. The logic level that must be
applied to any particular unused input depends on the function of the device. Generally, they are tied to GND or
VCC, whichever makes more sense or is more convenient.
11.2 Layout Example
VCC
Input
Unused Input
Output
Unused Input
Output
Input
Figure 7. Layout Diagram
Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
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SCAS287U – JANUARY 1993 – REVISED JANUARY 2017
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12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
For related documentation see the following:
Implications of Slow or Floating CMOS Inputs (SCBA004)
12.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to order now.
Table 2. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
SN54LVC74A
Click here
Click here
Click here
Click here
Click here
SN74LVC74A
Click here
Click here
Click here
Click here
Click here
12.3 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.4 Community Resource
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.5 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.6 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.7 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
14
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Copyright © 1993–2017, Texas Instruments Incorporated
Product Folder Links: SN54LVC74A SN74LVC74A
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
5962-9761601Q2A
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
59629761601Q2A
SNJ54LVC
74AFK
5962-9761601QCA
ACTIVE
CDIP
J
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-9761601QC
A
SNJ54LVC74AJ
5962-9761601QDA
ACTIVE
CFP
W
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-9761601QD
A
SNJ54LVC74AW
5962-9761601VDA
ACTIVE
CFP
W
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-9761601VD
A
SNV54LVC74AW
SN74LVC74AD
ACTIVE
SOIC
D
14
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVC74A
Samples
SN74LVC74ADBR
ACTIVE
SSOP
DB
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74ADBRG4
ACTIVE
SSOP
DB
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74ADR
ACTIVE
SOIC
D
14
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVC74A
Samples
SN74LVC74ADRE4
ACTIVE
SOIC
D
14
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVC74A
Samples
SN74LVC74ADT
ACTIVE
SOIC
D
14
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVC74A
Samples
SN74LVC74ANSR
ACTIVE
SO
NS
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVC74A
Samples
SN74LVC74APW
ACTIVE
TSSOP
PW
14
90
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74APWG4
ACTIVE
TSSOP
PW
14
90
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74APWR
ACTIVE
TSSOP
PW
14
2000
RoHS & Green
NIPDAU | SN
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74APWRE4
ACTIVE
TSSOP
PW
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74APWRG4
ACTIVE
TSSOP
PW
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74APWT
ACTIVE
TSSOP
PW
14
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
Addendum-Page 1
Samples
Samples
Samples
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
Orderable Device
14-Oct-2022
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
SN74LVC74APWTG4
ACTIVE
TSSOP
PW
14
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LC74A
Samples
SN74LVC74ARGYR
ACTIVE
VQFN
RGY
14
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
LC74A
Samples
SNJ54LVC74AFK
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
59629761601Q2A
SNJ54LVC
74AFK
SNJ54LVC74AJ
ACTIVE
CDIP
J
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-9761601QC
A
SNJ54LVC74AJ
SNJ54LVC74AW
ACTIVE
CFP
W
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
5962-9761601QD
A
SNJ54LVC74AW
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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