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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
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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 August 2002
74LCX16646
Low Voltage 16-Bit Transceiver/Register
with 5V Tolerant Inputs and Outputs
General Description
Features
The LCX16646 contains sixteen non-inverting bidirectional
registered bus transceivers with 3-STATE outputs, 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).
■ 5V tolerant inputs and outputs
The LCX16646 is designed for low voltage (2.5V or 3.3V)
VCC applications with capability of interfacing to a 5V signal
environment.
The LCX16646 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining
CMOS low power dissipation.
■ 2.3V–3.6V VCC specifications provided
■ 5.2 ns tPD max (VCC = 3.3V), 20 µA ICC max
■ Power down high impedance inputs and outputs
■ Supports live insertion/withdrawal (Note 1)
■ ±24 mA Output Drive (VCC = 3.0V)
■ Implements patented noise/EMI reduction circuitry
■ Latch-up performance exceeds 500 mA
■ ESD performance:
Human Body Model > 2000V
Machine Model > 200V
Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to VCC through a pull-up resistor: the minimum value or the
resistor is determined by the current-sourcing capability of the driver.
Ordering Code:
Order Number
Package Number
74LCX16646MEA
MS56A
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide
Package Description
74LCX16646MTD
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 suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
© 2002 Fairchild Semiconductor Corporation
DS012004
Description
An
Side A Inputs or 3-STATE Outputs
Bn
Side B Inputs or 3-STATE Outputs
OEn
Output Enable Inputs
CPABn, CPBAn
Clock Pulse Inputs
SABn, SBAn
Select Inputs
DIRn
Direction Control Inputs
www.fairchildsemi.com
74LCX16646 Low Voltage 16-Bit Transceiver/Register with 5V Tolerant Inputs and Outputs
February 1994
74LCX16646
Connection Diagram
Truth Table
(Note 2)
Inputs
OE1
DIR1
H
X
H
X
H
X
L
H
L
H
L
H
L
H
L
L
L
L
X
L
L
X
L
L
Data I/O
CPAB1 CPBA1
SAB1
SBA1
H or L
H or L
X
X
X
X
X
X
X
X
L
X
X
L
X
X
H or L
H = HIGH Voltage Level
L = LOW Voltage Level
X
X
X
A0–7
B0–7
Input
Input
Output Operation Mode
Isolation
Clock An Data into A Register
Clock Bn Data Into B Register
An to Bn — Real Time (Transparent Mode)
Input
Output Clock An Data to A Register
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
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
X = Immaterial
= LOW-to-HIGH Transition.
Note 2: 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.
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2
74LCX16646
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.
3
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74LCX16646
Functional Description
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
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
L
H
H or L
X
H
X
L
X
H
X
H
X
www.fairchildsemi.com
X
4
X
X
X
X
L
X
X
L
X
X
X
X
Symbol
Parameter
Value
VCC
Supply Voltage
−0.5 to +7.0
VI
DC Input Voltage
−0.5 to +7.0
VO
DC Output Voltage
−0.5 to +7.0
Conditions
Units
V
V
Output in 3-STATE
−0.5 to VCC + 0.5
Output in HIGH or LOW State (Note 4)
IIK
DC Input Diode Current
−50
VI < GND
IOK
DC Output Diode Current
−50
VO < GND
+50
VO > VCC
V
mA
mA
IO
DC Output Source/Sink Current
±50
mA
ICC
DC Supply Current per Supply Pin
±100
mA
IGND
DC Ground Current per Ground Pin
±100
mA
TSTG
Storage Temperature
−65 to +150
°C
Recommended Operating Conditions (Note 5)
Symbol
VCC
Parameter
Supply Voltage
VI
Input Voltage
VO
Output Voltage
IOH/IOL
Output Current
TA
Free-Air Operating Temperature
∆t/∆V
Input Edge Rate, VIN = 0.8V–2.0V, VCC = 3.0V
Min
Max
Operating
2.0
3.6
Data Retention
1.5
3.6
0
5.5
HIGH or LOW State
0
VCC
3-STATE
0
5.5
VCC = 3.0V − 3.6V
±24
VCC = 2.7V − 3.0V
±12
VCC = 2.3V − 2.7V
±8
Units
V
V
V
mA
−40
85
°C
0
10
ns/V
Note 3: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated
at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Note 4: IO Absolute Maximum Rating must be observed.
Note 5: Unused inputs and I/Os must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
VIH
VIL
VOH
VOL
Parameter
Conditions
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
LOW Level Output Voltage
IOH = −100 µA
VCC
TA = −40°C to +85°C
(V)
Min
2.3 − 2.7
1.7
2.7 − 3.6
2.0
Max
V
2.3 − 2.7
0.7
2.7 − 3.6
0.8
2.3 − 3.6
VCC − 0.2
IOH = −8 mA
2.3
1.8
IOH = −12 mA
2.7
2.2
IOH = −18 mA
3.0
2.4
IOH = −24 mA
3.0
2.2
IOL = 100 µA
2.3 − 3.6
Units
V
V
0.2
IOL = 8 mA
2.3
0.6
IOL = 12 mA
2.7
0.4
IOL = 16 mA
3.0
0.4
V
IOL = 24 mA
3.0
0.55
II
Input Leakage Current
0 ≤ VI ≤ 5.5V
2.3 − 3.6
±5.0
µA
IOZ
3-STATE I/O Leakage
0 ≤ VO ≤ 5.5V
2.3 − 3.6
±5.0
µA
0
10
µA
VI = V IH or VIL
IOFF
Power-Off Leakage Current
VI or VO = 5.5V
5
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74LCX16646
Absolute Maximum Ratings(Note 3)
74LCX16646
DC Electrical Characteristics
Symbol
Parameter
(Continued)
TA = −40°C to +85°C
VCC
Conditions
(V)
ICC
∆ICC
Quiescent Supply Current
Increase in ICC per Input
Min
Units
Max
VI = VCC or GND
2.3 − 3.6
20
3.6V ≤ VI, VO ≤ 5.5V (Note 6)
2.3 − 3.6
±20
VIH = VCC −0.6V
2.3 − 3.6
500
µA
µA
Note 6: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
TA = −40°C to +85°C, RL = 500Ω
Symbol
Parameter
VCC = 3.3V ± 0.3V
VCC = 2.7V
VCC = 2.5V ± 0.2V
CL = 50 pF
CL = 50 pF
CL = 30 pF
Min
Max
Min
Max
Min
Max
5.2
1.5
6.0
1.5
6.2
5.2
1.5
6.0
1.5
6.2
6.0
1.5
7.0
1.5
7.2
1.5
7.0
1.5
7.2
1.5
7.0
1.5
7.2
7.0
1.5
7.2
8.5
1.5
9.8
Units
fMAX
Maximum Clock Frequency
170
tPHL
Propagation Delay
1.5
tPLH
Bus to Bus
1.5
tPHL
Propagation Delay
1.5
tPLH
Clock to Bus
1.5
6.0
tPHL
Propagation Delay
1.5
6.0
tPLH
Select to Bus
1.5
6.0
1.5
tPZL
Output Enable Time
1.5
7.5
1.5
1.5
7.5
1.5
8.5
1.5
9.8
Output Disable Time
1.5
6.5
1.5
7.5
1.5
7.8
1.5
6.5
1.5
7.5
1.5
7.8
tS
Setup Time
2.5
tH
Hold Time
1.5
1.5
2.0
ns
tW
Pulse Width
3.0
3.0
3.5
ns
tOSHL
Output to Output Skew (Note 7)
tPZH
tPLZ
tPHZ
ns
2.5
3.0
ns
ns
ns
ns
ns
1.0
ns
1.0
tOSLH
ns
Note 7: 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). Parameter guaranteed by design.
Dynamic Switching Characteristics
Symbol
VOLP
VOLV
VCC
TA = 25°C
(V)
Typical
CL = 50 pF, VIH = 3.3V, VIL = 0V
3.3
0.8
CL = 30 pF, VIH = 2.5V, VIL = 0V
2.5
0.6
CL = 50 pF, VIH = 3.3V, VIL = 0V
3.3
−0.8
CL = 30 pF, VIH = 2.5V, VIL = 0V
2.5
−0.6
Parameter
Quiet Output Dynamic Peak VOL
Quiet Output Dynamic Valley VOL
Conditions
Units
V
V
Capacitance
Typical
Units
CIN
Symbol
Input Capacitance
Parameter
VCC = Open, VI = 0V or VCC
7
pF
CI/O
Input/Output Capacitance
VCC = 3.3V, VI = 0V or VCC
8
pF
CPD
Power Dissipation Capacitance
VCC = 3.3V, VI = 0V or VCC, F = 10 MHz
20
pF
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Conditions
6
74LCX16646
AC LOADING and WAVEFORMS Generic for LCX Family
FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance)
Test
Switch
tPLH, tPHL
Open
tPZL, tPLZ
6V at VCC = 3.3 ± 0.3V
VCC x 2 at VCC = 2.5 ± 0.2V
tPZH,tPHZ
GND
Waveform for Inverting and Non-Inverting Functions
3-STATE Output High Enable and
Disable Times for Logic
Propagation Delay. Pulse Width and trec Waveforms
Setup Time, Hold Time and Recovery Time for Logic
trise and tfall
3-STATE Output Low Enable and
Disable Times for Logic
FIGURE 2. Waveforms
(Input Characteristics; f =1MHz, tR = tF = 3ns)
Symbol
VCC
3.3V ± 0.3V
2.7V
2.5V ± 0.2V
Vmi
1.5V
1.5V
VCC/2
Vmo
1.5V
1.5V
VCC/2
Vx
VOL + 0.3V
VOL + 0.3V
VOL + 0.15V
Vy
VOH − 0.3V
VOH − 0.3V
VOH − 0.15V
7
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74LCX16646
Schematic Diagram Generic for LCX Family
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8
74LCX16646
Physical Dimensions inches (millimeters) unless otherwise noted
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide
Package Number MS56A
9
www.fairchildsemi.com
74LCX16646 Low Voltage 16-Bit Transceiver/Register with 5V Tolerant Inputs and Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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.
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10
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are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
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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
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