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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
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© 2005 Fairchild Semiconductor Corporation DS500421 www.fairchildsemi.com
May 2001
Revised June 2005
FSTD16861 20-Bit Bus Switch with Level Shifting
FSTD16861
20-Bit Bus Switch with Level Shifting
General Descript ion
The Fai rchild Switch F STD16 861 provides 20- bits of high-
speed CMOS TTL-compatible bus switching. The low On
Resistance of the switch allows inputs to be connected to
outputs without adding propagation delay or generating
addition al ground boun ce noise. A diode to VCC has been
integrated into the circuit to allow for level shifting between
5V inputs and 3.3V outputs.
The device is organized as a 10-bit or 20-bit bus switch.
When OE1 is LOW, the switch is ON and Port 1A is con-
nected to Port 1B. When OE2 is LOW, Port 2A is connected
to Port 2B. When OEX is HIGH, a high impedance state
exists between the A and B Ports.
Features
■4
:
switch connection between two ports.
■Minimal propagation delay through the switch.
■Low lCC.
■Zero bounce in flow-through mode.
■Control inputs compatible with TTL level.
■TruTranslation
¥
voltage translation from 5.0V inputs to
3.3V outputs
■Power-off high impedance inputs and outputs
■Supports live insertion/withdrawal (Note 1)
Note 1: To ensure the high-impedance state during power up or power
down, OE should be tied to VCC through a pull-up resistor; the minimum
value of th e resistor is determin ed by the curr ent-so urcing capab ility of the
driver.
Ordering Code:
Devices also available in Tape and R eel. Sp ec if y by appending the suffix lett er “X” to the orde ring code.
TruTranslation
¥
is tradem ark of Fairchild Semiconductor C orporation.
Order Number Package Number Package Description
FSTD16861MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
www.fairchildsemi.com 2
FSTD16861
Connection Diagram
Pin Descriptions
Logic Diagram
Truth Table
H
HIGH Volt age Level
L
LOW Voltage Le ve l
Z
High Impedance
Pin Name Description
OE1, OE2Bus Switch Enables
1An, 2AnBus A
1Bn, 2BnBus B
Inputs Inputs/Outputs
OE1OE21A, 1B 2A, 2B
LL1A
1B 2A
2B
LH1A
1B Z
HL Z 2A
2B
HH Z Z
3 www.fairchildsemi.com
FSTD16861
Absolute Maxim um Ratings(Note 2) Recommended Operating
Conditions (Note 5)
Note 2: The “Absolute Maximum Ratings” are those value s beyond whic h
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 rating.
The “R ecomm ended O peratin g Con ditions ” table will defin e the condition s
for actu al device operation.
Note 3: VS is the voltage observed/applied at either the A or B Ports across
the switch.
Note 4: The input and output negative voltage ratings may be exceeded if
the in put and output diode cu rrent rati ngs are obser v ed.
Note 5: Unused cont rol input s must be he ld HIG H or L OW. They ma y not
float.
DC Electrical Characteristics
Note 6: Typical values are at VCC
5.0V an d T A
25
q
C
Note 7: Measured by t he v oltage drop b et w een A and B pins at the ind ic at ed current through the sw it c h. On Resistanc e is determined by the lower of the
voltages o n t he t w o (A or B) pins.
Supply Voltage (VCC)
0.5V to
7.0V
DC Switch Voltage (VS) (Note 3)
0.5V to
7.0V
DC Input Voltage (VIN) (Note 4)
0.5V to
7.0V
DC Input Diode Current (lIK) VIN
0V
50 mA
DC Output Current (IOUT)128 mA
DC VCC/GND Current (ICC/IGND)
r
100 mA
Storage Temperature Range (TSTG)
65
q
C to
150
q
C
Power Su pply Ope rat i ng (V CC) 4.5V to 5.5V
Input Voltage (VIN) 0V to 5.5V
Output Voltage (VOUT) 0V to 5.5V
Input Rise and Fall Time (tr, tf)
Switch Control Input 0 ns/V to 5 ns/V
Switch I/O 0 ns/V to DC
Free Air Operating Temperature (TA)-40
q
C to
85
q
C
Symbol Parameter VCC TA
40
q
C to
85
q
CUnits Conditions
(V) Min Typ
(Note 6) Max
VIK Clamp Diode Voltage 4.5
1.2 V IIN
18 mA
VIH HIGH Level Input Voltage 4.5-5.5 2.0 V
VIL LOW Level Input Voltage 4.5-5.5 0.8 V
VOH HIGH Level 4.5-5.5 See Figure 3 V
IIInput Leakage Current 5.5
r
1.0
P
A0
d
VIN
d
5.5V
010
P
AV
IN
5.5V
IOZ OFF-STATE Leakage Current 5.5
r
1.0
P
A0
d
A, B
d
VCC
RON Switch On Resistance 4.5 4 7
:
VIN
0V, IIN
64 m A
(Note 7) 4.5 4 7
:
VIN
0V, IIN
30 m A
4.5 35 50
:
VIN
2.4V, IIN
15 mA
ICC Quiescent Supply Current
5.5 1.5 mA OE1
OE2
GND
VIN
VCC or GND, IOUT
0
10
P
AOE1
OE2
VCC
VIN
VCC or GND, IOUT
0
'
ICC Increase in ICC per Input 5.5 2.5 mA One Input at 3.4V
Other Inputs at VCC or GND
www.fairchildsemi.com 4
FSTD16861
AC Electrical Characteristics
Note 8: This parameter is guaranteed by design but is not tested. The bus switch contribut es no propagatio n delay other than t he RC delay of the typical On
Resis tance of the swit c h and the 50p F load capacitance, when driv en by an ide al v olt age source (zero output im pedance ).
Cap acitance (Note 9)
Note 9: TA
25
q
C, f
1 Mhz, Capac ita nc e is charac te riz ed but not te sted.
AC Loading and Waveforms
Note: Input drive n by 50
:
source terminated in 50
:
Note: CL includ es load and stray capa citance
Note: Input PRR
1.0 MHz , tW
500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
Symbol Parameter
TA
40
q
C to
85
q
C,
Units Conditions
CL
50pF, RU
RD
500
:
Figure
VCC
4.5 – 5.5V Number
Min Max
tPHL, tPLH Propagation Delay Bus-to-Bus (Note 8) 0.25 ns VI
OPEN Figures
1, 2
tPZH, tPZL Output Enable Time 1.0 6.0 ns VI
7V for tPZL Figures
1, 2
VI
OPEN for tPZH
tPHZ, tPLZ Output Disable Time 1.0 7.0 ns VI
7V for tPLZ Figures
1, 2
VI
OPEN for tPHZ
Symbol Parameter Typ Max Units Conditions
CIN Control Pin Input Capacitance 3 pF VCC
5.0V, VIN
0V
CI/O Input/Output Capacitance “OFF State”6pFV
CC, OE
5.0V, VIN
0V
5 www.fairchildsemi.com
FSTD16861
Output Voltage HIGH vs. Supply Voltage
FIGURE 3.
www.fairchildsemi.com 6
FSTD16861 20-Bit Bus Switch with Level Shifting
Physical Dimensions inches (millimeters) unless otherwise noted
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Package Number MTD48
Technology Description
The Fairchild Switch fam ily derives from and embodies Fairchild’s pro ven switch tec hnology used fo r several years in its
74LVX3L384(FST3384) bus swi tch product.
Fairchild does no t assume any responsibility for use of any circui try 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:
1. Life suppor t de vices o r systems a re devices or syste ms
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 rea-
sonably expected to result in a significant injury to the
user.
2. A critical compon ent i n any compon ent of a lif e supp ort
device or system whose failure to perform can be rea-
sonabl y ex pect ed to cause the fa ilu re of the lif e su pp ort
device or system, or to affect it s safety or effectiveness.
www.fairchildsemi.com
www.onsemi.com
1
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.
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