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SN74LVCHR16245A
SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
SN74LVCHR16245A 16-Bit Bus Transceiver With 3-State Outputs
1 Features
2 Applications
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Member of the Texas Instruments
Widebus™ Family
Operates From 1.65 V to 3.6 V
Inputs Accept Voltages to 5.5 V
Max tpd of 4.8 ns at 3.3 V
Typical VOLP (Output Ground Bounce)
< 0.8 V at VCC = 3.3 V, TA = 25°C
Typical VOHV (Output VOH Undershoot)
> 2 V at VCC = 3.3 V, TA = 25°C
Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage
With 3.3-V VCC)
Bus Hold on Data Inputs Eliminates the Need for
External Pullup or Pulldown Resistors
All Outputs Have Equivalent 26-Ω Series
Resistors, So No External Resistors Are Required
Ioff Supports Live Insertion, Partial Power-Down
Mode, and Back-Drive Protection
Latch-Up Performance Exceeds 250 mA
Per JESD 17
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model
– 200-V Machine Model
Telecom Infrastructures
Industrial Transport
Wireless Infrastructures
Servers
Tests and Measurements
3 Description
This 16-bit (dual-octal) noninverting bus transceiver is
designed for 1.65-V to 3.6-V VCC operation.
The SN74LVCHR16245A device is designed for
asynchronous communication between data buses.
The control-function implementation minimizes
external-timing requirements.
Device Information(1)
PART NUMBER
SN74LVCHR16245A
PACKAGE
BODY SIZE (NOM)
TSSOP (48)
12.50 mm × 6.10 mm
SSOP (48)
15.88 mm × 7.49 mm
TVSOP (48)
9.70 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
2DIR
1DIR
2OE
1OE
2A1
1A1
2B1
1B1
To Seven Other Channels
To Seven Other Channels
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.
SN74LVCHR16245A
SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
9
Features ..................................................................
Applications ...........................................................
Description .............................................................
Simplified Schematic.............................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
1
2
3
6
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
6
6
7
7
8
9
9
9
Absolute Maximum Ratings .....................................
Handling Ratings.......................................................
Recommended Operating Conditions ......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Switching Characteristics ..........................................
Operating Characteristics..........................................
Typical Characteristics ..............................................
Parameter Measurement Information ................ 10
Detailed Description ............................................ 11
9.1
9.2
9.3
9.4
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
11
11
12
12
10 Application and Implementation........................ 13
10.1 Application Information.......................................... 13
10.2 Typical Application ............................................... 13
11 Power Supply Recommendations ..................... 15
12 Layout................................................................... 15
12.1 Layout Guidelines ................................................. 15
12.2 Layout Example .................................................... 15
13 Device and Documentation Support ................. 16
13.1 Trademarks ........................................................... 16
13.2 Electrostatic Discharge Caution ............................ 16
13.3 Glossary ................................................................ 16
14 Mechanical, Packaging, and Orderable
Information ........................................................... 16
5 Revision History
Changes from Revision P (December 2005) to Revision Q
Page
•
Updated document to new TI data sheet format. ................................................................................................................... 1
•
Removed Ordering Information table. .................................................................................................................................... 1
•
Changed Ioff bullet in Features................................................................................................................................................ 1
•
Added Applications. ................................................................................................................................................................ 1
•
Added Pin Functions table...................................................................................................................................................... 3
•
Added Handling Ratings table. ............................................................................................................................................... 6
•
Changed MAX operating temperature to 125°C in Recommended Operating Conditions table. ......................................... 7
•
Added Thermal Information table. .......................................................................................................................................... 7
•
Added Typical Characteristics. ............................................................................................................................................... 9
•
Added Detailed Description section...................................................................................................................................... 11
•
Added Application and Implementation section.................................................................................................................... 13
•
Added Power Supply Recommendations and Layout sections............................................................................................ 15
2
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SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
6 Pin Configuration and Functions
DGG, DGV, OR DL PACKAGE
(TOP VIEW)
1DIR
1B1
1B2
GND
1B3
1B4
VCC
1B5
1B6
GND
1B7
1B8
2B1
2B2
GND
2B3
2B4
VCC
2B5
2B6
GND
2B7
2B8
2DIR
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
1OE
1A1
1A2
GND
1A3
1A4
VCC
1A5
1A6
GND
1A7
1A8
2A1
2A2
GND
2A3
2A4
VCC
2A5
2A6
GND
2A7
2A8
2OE
Pin Functions
PIN
I/O
DESCRIPTION
1DIR
I
Direction pin 1
1B1
I/O
1B1 input or output
3
1B2
I/O
1B2 input or output
4
GND
—
Ground pin
5
1B3
I/O
1B3 input or output
6
1B4
I/O
1B4 input or output
7
VCC
—
Power pin
8
1B5
I/O
1B5 input or output
9
1B6
I/O
1B6 input or output
10
GND
—
Ground pin
11
1B7
I/O
1B7 input or output
12
1B8
I/O
1B8 input or output
13
2B1
I/O
2B1 input or output
14
2B2
I/O
2B2 input or output
15
GND
—
Ground pin
16
2B3
I/O
2B3 input or output
17
2B4
I/O
2B4 input or output
18
VCC
—
Power pin
NO.
NAME
1
2
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SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
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Pin Functions (continued)
PIN
4
I/O
DESCRIPTION
2B5
I/O
2B5 input or output
2B6
I/O
2B6 input or output
21
GND
—
Ground pin
22
2B7
I/O
2B7 input or output
23
2B8
I/O
2B8 input or output
24
2DIR
I
Direction pin 2
25
2OE
I
Output Enable 2
26
2A8
I/O
2A8 input or output
27
2A7
I/O
2A7 input or output
28
GND
—
Ground pin
29
2A6
I/O
2A6 input or output
30
2A5
I/O
2A5 input or output
31
VCC
—
Power pin
32
2A4
I/O
2A4 input or output
33
2A3
I/O
2A3 input or output
34
GND
—
Ground pin
35
2A2
I/O
2A2 input or output
36
2A1
I/O
2A1 input or output
37
1A8
I/O
1A8 input or output
38
1A7
I/O
1A7 input or output
39
GND
—
Ground pin
40
1A6
I/O
1A6 input or output
41
1A5
I/O
1A5 input or output
42
VCC
—
Power pin
43
1A4
I/O
1A4 input or output
44
1A3
I/O
1A3 input or output
45
GND
—
Ground pin
46
1A2
I/O
1A2 input or output
47
1A1
I/O
1A1 input or output
48
1OE
I
NO.
NAME
19
20
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Output Enable 1
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SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
GQL OR ZQL PACKAGE
(TOP VIEW)
1 2 3 4 5 6
A
B
C
D
E
F
G
H
J
K
Table 1. Pin Assignments (1)
(56-Ball GQL or ZQL Package)
1
2
3
4
5
6
A
1DIR
NC
NC
NC
NC
1OE
B
1B2
1B1
GND
GND
1A1
1A2
C
1B4
1B3
VCC
VCC
1A3
1A4
D
1B6
1B5
GND
GND
1A5
1A6
E
1B8
1B7
1A7
1A8
F
2B1
2B2
2A2
2A1
G
2B3
2B4
GND
GND
2A4
2A3
H
2B5
2B6
VCC
VCC
2A6
2A5
J
2B7
2B8
GND
GND
2A8
2A7
K
2DIR
NC
NC
NC
NC
2OE
(1)
NC – No internal connection
GRD OR ZRD PACKAGE
(TOP VIEW)
2
3
4
5
6
1
A
B
C
D
E
F
G
H
J
Table 2. Pin Assignments (1)
(54-Ball GRD or ZRD Package)
(1)
1
2
3
4
5
6
A
1B1
NC
1DIR
1OE
NC
1A1
B
1B3
1B2
NC
NC
1A2
1A3
C
1B5
1B4
VCC
VCC
1A4
1A5
D
1B7
1B6
GND
GND
1A6
1A7
E
2B1
1B8
GND
GND
1A8
2A1
F
2B3
2B2
GND
GND
2A2
2A3
G
2B5
2B4
VCC
VCC
2A4
2A5
H
2B7
2B6
NC
NC
2A6
2A7
J
2B8
NC
2DIR
2OE
NC
2A8
NC – No internal connection
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SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
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7 Specifications
7.1 Absolute Maximum Ratings (1)
over operating free-air temperature range (unless otherwise noted)
VCC
MIN
MAX
Supply voltage range
–0.5
6.5
UNIT
V
(2)
VI
Input voltage range
–0.5
6.5
V
VO
Voltage range applied to any output in the high-impedance or power-off state (2)
–0.5
6.5
V
VO
Voltage range applied to any output in the high or low state (2) (3)
–0.5
VCC + 0.5
V
IIK
Input clamp current
VI < 0
–50
mA
IOK
Output clamp current
VO < 0
–50
mA
IO
Continuous output current
±50
mA
±100
mA
Continuous current through each VCC or GND
(1)
(2)
(3)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
The value of VCC is provided in the Recommended Operating Conditions table.
7.2 Handling Ratings
Tstg
V(ESD)
(1)
(2)
6
MIN
MAX
UNIT
–65
150
°C
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all
pins (1)
0
2000
Charged device model (CDM), per JEDEC specification
JESD22-C101, all pins (2)
0
2000
Storage temperature range
Electrostatic discharge
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.
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SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) (1)
Operating
VCC
Supply voltage
VIH
High-level input voltage
Data retention only
MIN
MAX
1.65
3.6
0.65 × VCC
VCC = 2.3 V to 2.7 V
1.7
VCC = 2.7 V to 3.6 V
2
VCC = 1.65 V to 1.95 V
Low-level input voltage
VI
Input voltage
V
0.35 × VCC
VCC = 2.3 V to 2.7 V
0.7
VCC = 2.7 V to 3.6 V
VO
Output voltage
IOH
High-level output current
Low-level output current
Δt/Δv
Input transition rise or fall rate
TA
Operating free-air temperature
5.5
High or low state
0
VCC
3-state
0
5.5
VCC = 1.65 V
–2
VCC = 2.3 V
–4
VCC = 2.7 V
–8
V
V
mA
–12
VCC = 1.65 V
2
VCC = 2.3 V
4
VCC = 2.7 V
8
VCC = 3 V
(1)
V
0.8
0
VCC = 3 V
IOL
V
1.5
VCC = 1.65 V to 1.95 V
VIL
UNIT
mA
12
–40
10
ns/V
125
°C
All unused control inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs (SCBA004).
7.4 Thermal Information
SN74LVCHR16245A
THERMAL METRIC (1)
DGG
DGV
DL
UNIT
48 PINS
RθJA
Junction-to-ambient thermal resistance
64.3
78.4
68.4
RθJC(top)
Junction-to-case (top) thermal resistance
17.6
30.7
34.7
RθJB
Junction-to-board thermal resistance
31.5
41.8
41.0
ψJT
Junction-to-top characterization parameter
1.1
3.8
12.3
ψJB
Junction-to-board characterization parameter
31.2
41.3
40.4
(1)
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report (SPRA953).
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7.5 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
IOH = –100 µA
1.65 V to 3.6 V
IOH = –2 mA
1.2
1.7
2.7 V
2.2
IOH = –6 mA
3V
2.4
IOH = –8 mA
2.7 V
2
IOH = –12 mA
3V
2
IOL = 100 µA
1.65 V to 3.6 V
0.2
1.65 V
0.45
2.3 V
0.7
IOL = 4 mA
II
2.7 V
0.4
3V
0.55
IOL = 8 mA
2.7 V
0.6
IOL = 12 mA
3V
0.8
3.6 V
VI = 0.58 V
1.65 V
VI = 1.07 V
VI = 0.7 V
II(hold)
A or B port
V
IOL = 6 mA
Control inputs VI = 0 to 5.5 V
2.3 V
VI = 1.7 V
VI = 0.8 V
3V
VI = 2 V
UNIT
VCC – 0.2
2.3 V
IOL = 2 mA
VOL
TYP (1) MAX
1.65 V
IOH = –4 mA
VOH
MIN
±5
V
µA
15
–15
45
–45
µA
75
–75
VI = 0 to 3.6 V (2)
3.6 V
±500
Ioff
VI or VO = 5.5 V
0
±10
µA
IOZ (3)
VO = 0 V or (VCC to 5.5 V)
2.3 V to 3.6 V
±5
µA
VI = VCC or GND
ICC
3.6 V ≤ VI ≤ 5.5 V (4)
ΔICC
IO = 0
One input at VCC – 0.6 V, Other inputs at VCC or GND
20
3.6 V
20
2.7 V to 3.6 V
500
µA
µA
Ci
Control inputs VI = VCC or GND
3.3 V
3
pF
Cio
A or B port
3.3 V
12
pF
(1)
(2)
(3)
(4)
8
VO = VCC or GND
All typical values are at VCC = 3.3 V, TA = 25°C.
This is the bus-hold maximum dynamic current. It is the minimum overdrive current required to switch the input from one state to
another.
For the total leakage current in an I/O port, please consult the II(hold) specification for the input voltage condition 0 V < VI < VCC, and the
IOZ specification for the input voltage conditions VI = 0 V or VI = VCC to 5.5 V. The bus-hold current, at input voltages greater than VCC,
is negligible.
This applies in the disabled state only.
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7.6 Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 3)
FROM
(INPUT)
TO
(OUTPUT)
tpd
A or B
ten
OE
tdis
OE
PARAMETER
VCC = 1.8 V
± 0.15 V
VCC = 2.5 V
± 0.2 V
MIN
MAX
MIN
B or A
1
12.5
A or B
1
15.8
A or B
1
19.2
VCC = 2.7 V
VCC = 3.3 V
± 0.3 V
UNIT
MAX
MIN
MAX
MIN
MAX
1
9.5
1
5.7
1.5
4.8
ns
1
12.2
1
7.9
1.5
6.3
ns
1
11.9
1
8.3
2.2
7.4
ns
7.7 Operating Characteristics
TA = 25°C
TEST
CONDITIONS
PARAMETER
Power dissipation capacitance
per transceiver
Cpd
Outputs enabled
Outputs disabled
f = 10 MHz
VCC = 1.8 V
VCC = 2.5 V
VCC = 3.3 V
TYP
TYP
TYP
36
36
39
3
3
4
UNIT
pF
7.8 Typical Characteristics
12
4
TPD in ns
3.5
10
3
TPD (ns)
TPD (ns)
8
6
2.5
2
1.5
4
1
2
0.5
TPD in ns
0
0
1
2
VCC (V)
3
4
0
-100
-50
D001
Figure 1. TPD vs VCC
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0
50
Temperature (qC)
100
150
D002
Figure 2. TPD vs Temperature
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8 Parameter Measurement Information
VLOAD
S1
RL
From Output
Under Test
Open
GND
CL
(see Note A)
RL
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
VLOAD
GND
LOAD CIRCUIT
INPUT
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
V∆
VCC/2
VCC/2
1.5 V
1.5 V
VCC
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
th
VI
VM
Input
VM
VI
VM
VM
Data Input
0V
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATION
VI
VM
Input
VM
0V
tPHL
tPLH
VOH
VM
Output
VM
VOL
VM
VM
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VM
VM
0V
tPZL
tPLZ
VLOAD/2
VM
tPZH
VOH
Output
Output
Waveform 1
S1 at VLOAD
(see Note B)
tPLH
tPHL
VI
Output
Control
VOL + V∆
VOL
tPHZ
Output
Waveform 2
S1 at GND
(see Note B)
VM
VOH − V∆
VOH
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
NOTES: A. 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.
F. 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.
Figure 3. Load Circuit and Voltage Waveforms
10
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9 Detailed Description
9.1 Overview
This 16-bit (dual-octal) noninverting bus transceiver is designed for 1.65-V to 3.6-V VCC operation.
The SN74LVCHR16245A device is designed for asynchronous communication between data buses. The controlfunction implementation minimizes external-timing requirements.
This device can be used as two 8-bit transceivers or one 16-bit transceiver. It allows data transmission from the
A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR)
input. The output-enable (OE) input can disable the device so that the buses are effectively isolated.
All outputs, which are designed to sink up to 12 mA, include equivalent 26-Ω series resistors to reduce overshoot
and undershoot.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
9.2 Functional Block Diagram
2DIR
1DIR
2OE
1OE
2A1
1A1
2B1
1B1
To Seven Other Channels
To Seven Other Channels
Figure 4. Logic Diagram (Positive Logic)
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Product Folder Links: SN74LVCHR16245A
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9.3 Feature Description
•
•
•
•
•
Wide operating voltage range
– Operates from 1.65 V to 3.6 V
Allows down voltage translation
– Inputs accept voltages to 5.5 V
Ioff feature
– Allows voltages on the inputs and outputs when VCC is 0 V
All outputs have equivalent 26-Ω series resistors, so no external resistors are required
Bus hold on data inputs eliminates the need for external pullup or pulldown resistors
9.4 Device Functional Modes
Table 3. Function Table (1)
(Each 8-bit Section)
CONTROL INPUTS
OE
(1)
12
OUTPUT CIRCUITS
OPERATION
DIR
A PORT
B PORT
L
L
Enabled
Hi-Z
B data to A bus
L
H
Hi-Z
Enabled
A data to B bus
H
X
Hi-Z
Hi-Z
Isolation
Input circuits of the data I/Os always are active.
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SCAS582Q – NOVEMBER 1996 – REVISED OCTOBER 2014
10 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.
10.1 Application Information
The SN74LVCHR16245A device is a 16-bit bidirectional transceiver. This device can be used as two 8-bit
transceivers or one 16-bit transceiver. It allows data transmission from the A bus to the B bus or from the B bus
to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can
be used to disable the device so that the buses are effectively isolated. The device has 5.5-V tolerant inputs at
any valid VCC which allows the device to be used in multi-power systems and used for down translation. All
outputs have equivalent 26-Ω series resistors, so no external resistors are required. The Bus Hold feature
eliminates the need for external pullup or pulldown resistors on unused or floating inputs.
10.2 Typical Application
Regulated 1.65 V to 3.6 V
Regulated 5 V
Regulated 1.8 V
OE
VCC
OE
DIR
A1
DIR
B1
µC or other
system boards
A8
VCC
µC or other
system boards
B8
µC
LEDs, relays
or other
system boards
GND
A1
B1
A8
B8
GND
µC
LEDs, relays
or other
system boards
Figure 5. Typical Application Schematic
10.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Care should be taken to avoid bus
contention because it can drive currents that would exceed maximum limits. The high drive will also create fast
edges into light loads, so routing and load conditions should be considered to prevent ringing.
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Typical Application (continued)
10.2.2 Detailed Design Procedure
1. Recommended Input Conditions:
– Rise time and fall time specifications, see Δt/ΔV in the Recommended Operating Conditions table.
– Specified high and low levels, see VIH and VIL in the Recommended Operating Conditions table.
– Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid VCC.
2. Recommend Output Conditions:
– Load currents should not exceed 50 mA per output and 100 mA total for the part.
– Outputs should not be pulled above VCC.
10.2.3 Application Curves
300
250
ICC (mA)
200
150
100
ICC 1.8 V
ICC 2.5 V
ICC 3.3 V
50
0
0
10
20
30
40
Frequency (MHz)
50
60
D001
Figure 6. ICC vs Frequency
14
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11 Power Supply Recommendations
The power supply can be any voltage between the MIN and MAX supply voltage rating located in the
Recommended Operating Conditions table.
Each VCC pin should have a good bypass capacitor to prevent power disturbance. For devices with a single
supply, 0.1 μF is recommended. If there are multiple VCC pins, 0.01 μF or 0.022 μF is recommended for each
power pin. It is acceptable to parallel multiple bypass caps to reject different frequencies of noise. A 0.1 μF and
1 μF are commonly used in parallel. The bypass capacitor should be installed as close to the power pin as
possible for best results.
12 Layout
12.1 Layout Guidelines
When using multiple bit logic devices, inputs should not float. In many cases, functions or parts of functions of
digital logic devices are unused. Some examples are 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 should 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 should be applied to any particular unused
input depends on the function of the device. Generally they will be tied to GND or VCC, whichever makes more
sense or is more convenient. It is acceptable to float outputs unless the part is a transceiver. If the transceiver
has an output enable pin, it will disable the outputs section of the part when asserted. This will not disable the
input section of the I/Os so they also cannot float when disabled.
12.2 Layout Example
Vcc
Input
Unused Input
Output
Unused Input
Output
Input
Figure 7. Layout Diagram
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13 Device and Documentation Support
13.1 Trademarks
Widebus is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
13.2 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.
13.3 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
14 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.
16
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PACKAGE OPTION ADDENDUM
www.ti.com
22-Jan-2021
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)
(4/5)
(6)
74LVCHR162245ADLG4
ACTIVE
SSOP
DL
48
1000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
(LVCHR162245A, LVC
HR16245A)
74LVCHR16245AGRG4
ACTIVE
TSSOP
DGG
48
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVCHR16245A
SN74LVCHR162245ADL
ACTIVE
SSOP
DL
48
1000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
(LVCHR162245A, LVC
HR16245A)
SN74LVCHR16245AGR
ACTIVE
TSSOP
DGG
48
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LVCHR16245A
SN74LVCHR16245ALR
ACTIVE
SSOP
DL
48
1000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
(LVCHR162245A, LVC
HR16245A)
SN74LVCHR16245AVR
ACTIVE
TVSOP
DGV
48
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
LDR245A
(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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