Is Now Part of
To learn more about ON Semiconductor, please visit our website at
www.onsemi.com
Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers
will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor
product management systems do not have the ability to manage part nomenclature that utilizes an underscore
(_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain
device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated
device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please
email any questions regarding the system integration to Fairchild_questions@onsemi.com.
ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right
to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON
Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor
is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
Revised October 2001
74LVT16646 • 74LVTH16646
Low Voltage 16-Bit Transceiver/Register
with 3-STATE Outputs
General Description
Features
The LVT16646 and LVTH16646 contains sixteen noninverting bidirectional registered bus transceivers providing
multiplexed transmission of data directly from the input bus
or from the internal storage registers. Each byte has separate control inputs which can be shorted together for full
16-bit operation. The DIR inputs determine the direction of
data flow through the device. The CPAB and CPBA inputs
load data into the registers on the LOW-to-HIGH transition
(see Functional Description).
■ Input and output interface capability to systems at
5V VCC
The LVTH16646 data inputs include bushold, eliminating
the need for external pull-up resistors to hold unused
inputs.
■ Outputs source/sink −32 mA/+64 mA
These transceivers are designed for low-voltage (3.3V)
VCC applications, but with the capability to provide a TTL
interface to a 5V environment. The LVT16646 and
LVTH16646 are fabricated with an advanced BiCMOS
technology to achieve high speed operation similar to 5V
ABT while maintaining low power dissipation.
■ Bushold data inputs eliminate the need for external
pull-up resistors to hold unused inputs (74LVTH16646)
■ Also available without bushold feature (74LVT16646)
■ Live insertion/extraction permitted
■ Power Up/Down high impedance provides
glitch-free bus loading
■ Latch-up conforms to JEDEC JED78
■ ESD performance:
Human-body model > 2000V
Machine model > 200V
Charged-device model > 1000V
Ordering Code:
Order Number
Package Number
Package Description
74LVT16646MEA
(Preliminary)
MS56A
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide
74LVT16646MTD
(Preliminary)
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
74LVTH16646MEA
MS56A
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide
74LVTH16646MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
© 2001 Fairchild Semiconductor Corporation
DS012023
www.fairchildsemi.com
74LVT16646 • 74LVTH16646 Low Voltage 16-Bit Transceiver/Register with 3-STATE Outputs
January 2000
74LVT16646 • 74LVTH16646
Connection Diagram
Pin Descriptions
Pin Names
Description
A0–A15
Data Register A Inputs/3-STATE Outputs
B0–B15
Data Register B Inputs/3-STATE Outputs
CPABn, CPBAn
Clock Pulse Inputs
SABn, SBAn
Select Inputs
OE1, OE2
Output Enable Inputs
DIRn
Direction Control Inputs
Truth Table
(Note 1)
Inputs
OE1
DIR1
H
X
H
X
H
X
L
H
Data I/O
CPAB1 CPBA1 SAB1
SBA1
H or L
H or L
X
X
X
X
X
X
X
L
H
L
H
L
H
L
L
L
L
X
L
L
X
L
L
X
H or L
X
H = HIGH Voltage Level
X = Immaterial
L = LOW Voltage Level
= LOW-to-HIGH Transition.
X
A0–7
B0–7
Input
Input
Output Operation Mode
Isolation
Clock An Data into A Register
X
X
Clock Bn Data Into B Register
L
X
An to Bn—Real Time (Transparent Mode)
X
L
X
X
H
X
A Register to Bn (Stored Mode)
X
H
X
Clock An Data into A Register and Output to Bn
X
H or L
Input
Output Clock An Data to A Register
X
L
X
L
Bn to An—Real Time (Transparent Mode)
X
H
B Register to An (Stored Mode)
X
H
Clock Bn into B Register and Output to An
Output
Input
Clock Bn Data into B Register
Note 1: The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled; i.e.,
data at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs. Also applies to data I/O (A and B: 8-15) and #2 control
pins.
www.fairchildsemi.com
2
In the transceiver mode, data present at the HIGH impedance port may be stored in either the A or B register or
both. The select (SABn, SBAn) controls can multiplex
stored and real-time. The examples shown below demonstrate the four fundamental bus-management functions
that can be performed.
The direction control (DIRn) determines which bus will
receive data when OEn is LOW. In the isolation mode (OEn
HIGH), A data may be stored in one register and/or B data
may be stored in the other register. When an output function is disabled, the input function is still enabled and may
be used to store and transmit data. Only one of the two
busses, A or B, may be driven at a time.
Real-Time Transfer
Bus B to Bus A
Real-Time Transfer
Bus A to Bus B
OE DIR CPAB CPBA SAB SBA
L
L
X
X
X
OE DIR CPAB CPBA SAB SBA
L
L
H
Transfer Storage
Data to A or B
X
X
L
X
Storage
OE DIR CPAB CPBA SAB SBA
OE DIR CPAB CPBA SAB SBA
L
L
X
H or L
X
H
L
H
H or L
X
H
X
3
L
H
L
L
H
X
H
X
X
X
X
X
L
X
X
L
X
X
X
X
www.fairchildsemi.com
74LVT16646 • 74LVTH16646
Functional Description
74LVT16646 • 74LVTH16646
Logic Diagrams
Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.fairchildsemi.com
4
Symbol
Parameter
Value
Conditions
Units
VCC
Supply Voltage
−0.5 to +4.6
VI
DC Input Voltage
−0.5 to +7.0
VO
DC Output Voltage
−0.5 to +7.0
Output in 3-STATE
−0.5 to +7.0
Output in HIGH or LOW State (Note 3)
V
V
V
IIK
DC Input Diode Current
−50
VI < GND
IOK
DC Output Diode Current
−50
VO < GND
IO
DC Output Current
64
VO > VCC
Output at HIGH State
128
VO > VCC
Output at LOW State
V
mA
mA
mA
ICC
DC Supply Current per Supply Pin
±64
mA
IGND
DC Ground Current per Ground Pin
±128
mA
TSTG
Storage Temperature
−65 to +150
°C
Recommended Operating Conditions
Symbol
Parameter
Min
Max
2.7
3.6
V
0
5.5
V
VCC
Supply Voltage
VI
Input Voltage
IOH
HIGH-Level Output Current
−32
IOL
LOW-Level Output Current
64
TA
Free-Air Operating Temperature
∆t/∆V
Input Edge Rate, VIN = 0.8V–2.0V, VCC = 3.0V
Units
mA
−40
85
°C
0
10
ns/V
Note 2: Absolute Maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions
beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum rated conditions is not implied.
Note 3: IO Absolute Maximum Rating must be observed.
5
www.fairchildsemi.com
74LVT16646 • 74LVTH16646
Absolute Maximum Ratings(Note 2)
74LVT16646 • 74LVTH16646
DC Electrical Characteristics
Symbol
T A = −40°C to +85°C
VCC
Parameter
(V)
Min
Max
Units
−1.2
Conditions
Input Clamp Diode Voltage
VIH
Input HIGH Voltage
2.7–3.6
VIL
Input LOW Voltage
2.7–3.6
VOH
Output HIGH Voltage
2.7–3.6
VCC − 0.2
V
IOH = −100 µA
2.7
2.4
V
IOH = −8 mA
3.0
2.0
V
IOH = −32 mA
VOL
II(HOLD)
2.7
II = −18 mA
VIK
Output LOW Voltage
Bushold Input Minimum Drive
II(OD)
Bushold Input Over-Drive
(Note 4)
Current to Change State
II
Input Current
Data Pins
Power Off Leakage Current
IPU/PD
Power Up/Down 3-STATE
VO ≤ 0.1V or
V
0.8
VO ≥ VCC − 0.1V
2.7
0.2
V
IOL = 100 µA
2.7
0.5
V
IOL = 24 mA
3.0
0.4
V
IOL = 16 mA
3.0
0.5
V
IOL = 32 mA
3.0
0.55
V
3.0
Control Pins
IOFF
2.0
3.0
(Note 4)
V
IOL = 64 mA
75
µA
−75
µA
VI = 2.0V
500
µA
(Note 5)
−500
VI = 0.8V
µA
(Note 6)
3.6
10
µA
VI = 5.5V
3.6
±1
µA
VI = 0V or VCC
−5
µA
VI = 0V
1
µA
VI = VCC
±100
µA
3.6
0
0V ≤ VI or VO ≤ 5.5V
VO = 0.5V to 3.0V
0–1.5V
±100
µA
IOZL (Note 4) 3-STATE Output Leakage Current
3.6
−5
µA
VO = 0.0V
IOZL
Output Current
VI = GND or VCC
3-STATE Output Leakage Current
3.6
−5
µA
VO = 0.5V
IOZH (Note 4) 3-STATE Output Leakage Current
3.6
5
µA
VO = 3.6V
IOZH
3-STATE Output Leakage Current
3.6
5
µA
VO = 3.0V
IOZH+
3-STATE Output Leakage Current
3.6
10
µA
VCC < VO ≤ 5.5V
ICCH
Power Supply Current
3.6
0.19
mA
Outputs HIGH
ICCL
Power Supply Current
3.6
5
mA
Outputs LOW
ICCZ
Power Supply Current
3.6
0.19
mA
Outputs Disabled
ICCZ+
Power Supply Current
3.6
0.19
mA
VCC ≤ VO ≤ 5.5V,Outputs Disabled
∆ICC
Increase in Power Supply Current
3.6
0.2
mA
(Note 7)
One Input at VCC − 0.6V
Other Inputs at VCC or GND
Note 4: Applies to bushold version only (74LVTH16646)
Note 5: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 6: An external driver must sink at least the specified current to switch from HIGH-to-LOW.
Note 7: This is the increase in supply current for each input that is at the specified voltage level rather than VCC or GND.
Dynamic Switching Characteristics
Symbol
Parameter
VCC
(V)
(Note 8)
TA = 25°C
Min
Typ
Max
Units
Conditions
CL = 50 pF, RL = 500Ω
VOLP
Quiet Output Maximum Dynamic VOL
3.3
0.8
V
(Note 9)
VOLV
Quiet Output Minimum Dynamic VOL
3.3
−0.8
V
(Note 9)
Note 8: Characterized in SSOP package. Guaranteed parameter, but not tested.
Note 9: Max number of outputs defined as (n). n−1 data inputs are driven 0V to 3V. Output under test held LOW.
www.fairchildsemi.com
6
TA = −40°C to +85°C
Symbol
CL = 50 pF, RL = 500Ω
Parameter
VCC = 3.3 ± 0.3V
Min
fMAX
Maximum Clock Frequency
150
tPLH
Propagation Delay
1.3
Max
VCC = 2.7V
Min
Max
150
5.4
MHz
1.3
5.9
tPHL
CPAB or CPBA to A or B
1.3
5.2
1.3
5.8
tPLH
Propagation Delay
1.0
4.4
1.0
4.7
tPHL
Data to A or B
1.0
4.6
1.0
5.1
tPLH
Propagation Delay
1.0
4.6
1.0
5.4
tPHL
SBA or SAB to A or B
1.0
4.8
1.0
5.6
tPZH
Output Enable Time
1.0
4.7
1.0
5.4
tPZL
OE to A or B
1.0
5.1
1.0
6.0
tPHZ
Output Disable Time
2.0
5.6
2.0
6.1
tPLZ
OE to A or B
2.0
5.4
2.0
6.1
tPZH
Output Enable Time
1.0
4.9
1.0
5.4
tPZL
DIR to A or B
1.0
5.4
1.0
6.4
tPHZ
Output Disable Time
1.5
6.4
1.5
7.1
1.5
5.4
1.5
5.9
tPLZ
DIR to A or B
tW
Pulse Duration
tS
Setup Time
tH
tOSHL
CPAB or CPBA HIGH or LOW
Hold Time
3.3
3.3
A or B before CPAB or CPBA, Data HIGH
1.2
1.5
A or B before CPAB or CPBA, Data LOW
2.0
2.8
A or B after CPAB or CPBA, Data HIGH
0.5
0.0
A or B after CPAB or CPBA, Data LOW
0.5
0.5
Output to Output Skew (Note 10)
tOSLH
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1.0
1.0
1.0
1.0
ns
Note 10: 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 (tOSHL) or LOW-to-HIGH (tOSLH).
Capacitance
Symbol
(Note 11)
Typical
Units
CIN
Input Capacitance
Parameter
VCC = Open, VI = 0V or VCC
Conditions
4
pF
CI/O
Input/Output Capacitance
VCC = 3.0V, VO = 0V or VCC
8
pF
Note 11: Capacitance is measured at frequency f = 1 MHz, per MIL-STD-883, Method 3012.
7
www.fairchildsemi.com
74LVT16646 • 74LVTH16646
AC Electrical Characteristics
74LVT16646 • 74LVTH16646
Physical Dimensions inches (millimeters) unless otherwise noted
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide
Package Number MS56A
www.fairchildsemi.com
8
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Package Number MTD56
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
www.fairchildsemi.com
9
www.fairchildsemi.com
74LVT16646 • 74LVTH16646 Low Voltage 16-Bit Transceiver/Register with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: orderlit@onsemi.com
© Semiconductor Components Industries, LLC
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5817−1050
www.onsemi.com
1
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
www.onsemi.com