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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
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May 2012
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSTD3125 • Rev. 1.0.3
FSTD3125 — 4-Bit Bus Switch with Level Shifting
FSTD3125 — 4-Bit Bus Switch with Level Shifting
Features
4Ω Switch Connection between Two Ports
Minimal Propagation Delay through the Switch
Low ICC
Zero Bounce in Flow-through Mode
Control Inputs Compatible with TTL Level
TruTranslation Voltage Translation from 5.0V Inputs
to 3.3V Outputs
Description
Fairchild switch FSTD3125 provides four high-speed
CMOS TTL-compatible bus switches. The low on
resistance of the switch allows inputs to be connected to
outputs without adding propagation delay or generating
additional ground bounce 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 four one-bit switches with
separate /OE inputs. When /OE is LOW, the switch is
ON and port A is connected to port B. When /OE is
HIGH, the switch is OPEN and a high-impedance state
exists between the two ports.
Ordering Information
Part Number Operating
Temperature
Range Package Packing
Method
FSTD3125MT CX -40 to 85°C 14-Lead, Thin Shrink Small Outline Package (TSSOP), JEDEC
MO-153, 4mm Wide Tape and Reel
1A
/OE
1
/OE
2
/OE
4
/OE
3
4A
3A
2A
1B
2B
3B
4B
1
23
4
56
8
10
9
13
1112
Figure 1. Logic Diagram
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FST3D125 • Rev. 1.0.3 2
FSTD3125 — 4-Bit Bus Switch with Level Shifting
Pin Configuration
/OE
1
1A
1B
/OE
2
2A
2B
GND
V
CC
/OE
4
4A
4B
/OE
3
3A
3B
14
13
12
11
10
9
8
1
2
3
4
5
6
7
Figure 2. Pin Assignments
Pin Descriptions
Pin # Pin Names Description
1, 4, 10, 13 /OE1, /OE2, /OE3, /OE4 Bus Switch Enables
2, 5, 9, 12 1A, 2A, 3A, 4A Bus A
3, 6, 8, 11 1B, 2B, 3B, 4B Bus B
14 VCC Supply Voltage
7 GND Ground
Truth Table
Inputs Inputs/Outputs
/OE A, B
LOW A = B
HIGH High Impedance
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FST3D125 • Rev. 1.0.3 3
FSTD3125 — 4-Bit Bus Switch with Level Shifting
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol Parameter Min. Max. Unit
VCC Supply Voltage -0.5 7.0 V
VS DC Switch Voltage -0.5 7.0 V
VIN DC Input Voltage(1) -0.5 7.0 V
IIK DC Input Diode Current, VIN<0V -50 mA
IOUT DC Output Sink Current 128 mA
ICC / IGND DC VCC / GND Current ±100 mA
TSTG Storage Temperature Range -65 +150 °C
Note:
1. The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are
observed.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol Parameter Min. Max. Unit
VCC Power Supply Operating 4.5 5.5 V
VIN Input Voltage 0 5.5 V
VOUT Output Voltage 0 5.5 V
tr, tf Input Rise and Fall Time Switch Control Input(2) 0 5 ns/V
Switch I/O 0 DC
TA Operating Temperature, Free Air -40 +85 °C
Note:
2. Unused control inputs must be held HIGH or LOW. They may not float.
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FST3D125 • Rev. 1.0.3 4
FSTD3125 — 4-Bit Bus Switch with Level Shifting
DC Electrical Characteristics
Typical values are at VCC = 5.0V and TA = 25°C.
Symbol Parameter Condition VCC (V) TA=-40 to +85°C Unit
Min. Typ. Max.
VIK Clamp Diode Voltage IIN = -18mA 4.5 -1.2 V
VIH High-Level Input Voltage 4.5 to 5.5 2.0 V
VOH High-Level Figure 5, Figure 6, and
Figure 7 4.0 to 5.5 V
VIL Low-Level Input Voltage 4.5 to 5.5 0.8 V
IIN Input Leakage Current 0 ≤ VIN ≤ 5.5V 5.5 ±1.0 µA
VIN = 5.5V 0 10 µA
IOZ Off-state Leakage Current 0 ≤ A, B ≤ VCC 5.5 ±1.0 µA
RON Switch On Resistance(3)
VIN = 0V, IIN = 64mA 4.5 4 7
Ω
VIN = 0V, IIN = 30mA 4.5 4 7
VIN = 2.4V, IIN = 15mA 4.5 35 50
ICC Quiescent Supply Current
/OE1 = /OE2 = GND
VIN = VCC or GND,
IOUT = 0 5.5
1.5
µA
/OE1 = /OE2 = VCC
VIN = VCC or GND,
IOUT = 0 10
ΔICC Increase in ICC per Input One Input at 3.4V, Other
Inputs at VCC or GND 5.5 2.5 mA
Note:
3. Measured by the voltage drop between the A and B pins at the indicated current through the switch. On
resistance is determined by the lower of the voltages on the A or B pins.
AC Electrical Characteristics
TA = -40 to +85°C, CL = 50pF, and RU = RD = 500Ω.
Symbol Parameter Condition
VCC = 4.5 – 5.5V Unit Figure
Min. Max.
tPHL, tPLH Propagation Delay, Bus-to-Bus(4) V
IN = Open 0.25 ns Figure 3
Figure 4
tPZH ,tPZL Output Enable Time VIN = 7V for tPZL
VIN = Open for tPZH 1.0 6.1 ns
Figure 3
Figure 4
tPHZ, tPLZ Output Disable Time VIN = 7V for tPLZ
VIN = Open for tPHZ 1.5 6.4 ns
Figure 3
Figure 4
Note:
4. This parameter is guaranteed by design, but is not tested. The bus switch contributes no propagation delay other
than the RC delay of the typical on resistance of the switch and the 50pF load capacitance when driven by an
ideal voltage source (zero output impedance).
Capacitance
TA = +25°C, f = 1MHz. Capacitance is characterized, but not tested.
Symbol Parameter Condition Typ. Unit
CIN Control Pin Input Capacitance VCC = 5.0V 3 pF
CI/O Input/Output Capacitance VCC, /OE = 5.0V 6 pF
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSTD3125 • Rev. 1.0.3 5
FSTD3125 — 4-Bit Bus Switch with Level Shifting
AC Loadings and Waveforms
Notes: Input driven by 50Ω source terminated in 50Ω.
CL includes load and stray capacitance.
Input PRR = 1.0MHz, tw = 500ns.
Figure 3. AC Test Circuit
Figure 4. AC Waveforms
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSTD3125 • Rev. 1.0.3 6
FSTD3125 — 4-Bit Bus Switch with Level Shifting
Performance Characteristics
Figure 5. Output Voltage vs. Supply Voltage, VIN = VCC, TA = 85°C
Figure 6. Output Voltage vs. Supply Voltage, VIN = VCC, TA = 25°C
Figure 7. Output Voltage vs. Supply Voltage, VIN = VCC, TA = 0°C
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSTD3125 • Rev. 1.0.3 7
FSTD3125 — 4-Bit Bus Switch with Level Shifting
Physical Dimensions
C. DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH,
AND TIE BAR EXTRUSIONS
F. DRAWING FILE NAME: MTC14REV6
R0.09 min
12.00°TOP & BOTTOM
0.43 TYP
1.00
D. DIMENSIONING AND TOLERANCES PER ANSI
Y14.5M, 1982
R0.09min
E. LANDPATTERN STANDARD: SOP65P640X110-14M
0.65
6.10
1.65
0.45
A. CONFORMS TO JEDEC REGISTRATION MO-153,
VARIATION AB, REF NOTE 6
B. DIMENSIONS ARE IN MILLIMETERS
Figure 8. 14-Lead, Thin Shrink Small Outline Package (TSSOP) MO-153, 4mm Wide
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’ s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSTD3125 • Rev. 1.0.3 8
FSTD3125 — 4-Bit Bus Switch with Level Shifting
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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