Fairchild FSTU3253 Dual 4:1 multiplexer/demultiplexer bus switch Datasheet

Revised September 2001
FSTU3253
Dual 4:1 Multiplexer/Demultiplexer Bus Switch
with −2V Undershoot Protection
General Description
Features
The Fairchild Switch FSTU3253 is a dual 4:1 high-speed
CMOS TTL-compatible multiplexer/demultiplexer bus
switch. The low On Resistance of the switch allows inputs
to be connected to outputs without adding propagation
delay or generating additional ground bounce noise.
■ Undershoot hardened to −2.0V
When OE is LOW, S0 and S1 connect the A Port to the
selected B Port output. When OE is HIGH, the switch is
OPEN and a high-impedance state exists between the two
ports.
■ Zero bounce in flow-through mode
■ 4Ω switch connection between two ports
■ Minimal propagation delay through the switch
■ Low lCC
■ Control inputs compatible with TTL level
■ See application note AN-5008 and AN-5021 for details
on undershoot
The A and B Ports are protected against undershoot to
support an extended range to 2.0V below ground.
Fairchild’s integrated Undershoot Hardened Circuit
(UHC) senses undershoot at the I/O and responds by
preventing voltage differentials from developing and turning the switch on.
Ordering Code:
Order Number
FSTU3253M
Package Number
M16A
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
FSTU3253QSC
MQA16
16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
FSTU3253MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
© 2001 Fairchild Semiconductor Corporation
DS500475
www.fairchildsemi.com
FSTU3253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch with −2V Undershoot Protection
August 2001
FSTU3253
Logic Diagram
Connection Diagram
Pin Descriptions
Truth Table
Pin Name
Description
S1
S0
OE1
OE2
Function
OE1, OE2
Bus Switch Enables
X
X
H
X
Disconnect 1A
S0 , S1
Select Inputs
X
X
X
H
Disconnect 2A
A
Bus A
L
L
L
L
A = B1
B1, B2, B3, B4
Bus B
L
H
L
L
A = B2
H
L
L
L
A = B3
H
H
L
L
A = B4
www.fairchildsemi.com
2
Recommended Operating
Conditions (Note 3)
Supply Voltage (VCC)
−0.5V to +7.0V
DC Switch Voltage (VS)
−2.0V to +7.0V
Power Supply Operating (VCC)
DC Input Voltage (VIN) (Note 2)
−0.5V to +7.0V
Input Voltage (VIN)
0V to 5.5V
0V to 5.5V
DC Input Diode Current (lIK) VIN < 0V
−50 mA
Output Voltage (VOUT)
DC Output (IOUT) Sink Current
128 mA
Input Rise and Fall Time (tr, tf)
+/− 100 mA
DC VCC/GND Current (ICC/IGND)
Storage Temperature Range (TSTG)
4.0V to 5.5V
Switch Control Input
−65°C to +150 °C
0 ns/V to 5 ns/V
Switch I/O
0 ns/V to DC
−40 °C to −85 °C
Free Air Operating Temperature (TA)
Note 1: 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 rating.
The Recommended Operating Conditions tables will define the conditions
for actual device operation.
Note 2: The input and output negative voltage ratings may be exceeded if
the input and output diode current ratings are observed.
Note 3: Unused control inputs must be held HIGH or LOW. They may not
float.
DC Electrical Characteristics
Symbol
Parameter
VCC
(V)
TA = −40 °C to +85 °C
Min
Typ
(Note 4)
Max
−1.2
Units
Conditions
IIN = −18 mA
VIK
Clamp Diode Voltage
VIH
High Level Input Voltage
4.0–5.5
VIL
Low Level Input Voltage
4.0–5.5
0.8
V
II
Input Leakage Current
5.5
±1.0
µA
0 ≤ VIN ≤ 5.5V
0
10
µA
VIN = 5.5V
±1.0
µA
0 ≤ A, B ≤ VCC
4.5
2.0
V
V
IOZ
OFF-STATE Leakage Current
5.5
RON
Switch On Resistance
4.5
4
7
Ω
VIN = 0V, IIN = 64 mA
(Note 5)
4.5
4
7
Ω
VIN = 0V, IIN = 30 mA
4.5
8
15
Ω
VIN = 2.4V, IIN = 15 mA
4.0
11
20
Ω
VIN = 2.4V, IIN = 15 mA
ICC
Quiescent Supply Current
5.5
3
µA
VIN = VCC or GND, IOUT = 0
∆ ICC
Increase in ICC per Input
5.5
2.5
mA
One Input at 3.4V
VIKU
Voltage Undershoot
5.5
−2.0
V
Other Inputs at VCC or GND
0.0 mA ≥ IIN ≥ −50 mA
OE = 5.5V
Note 4: Typical values are at VCC = 5.0V and TA = +25°C
Note 5: Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is determined by the lower of the
voltages on the two (A or B) pins.
3
www.fairchildsemi.com
FSTU3253
Absolute Maximum Ratings(Note 1)
FSTU3253
AC Electrical Characteristics
TA = −40 °C to +85 °C
CL = 50pF, RU = RD = 500Ω
Symbol
Parameter
VCC = 4.5 – 5.5V
Min
tPHL, tPLH
Max
Propagation Delay Bus to Bus (Note 6)
Propagation Delay, Select to Bus A
tPZH, tPZL
tPHZ, tPLZ
VCC = 4.0V
0.5
Min
Units
Figure
Number
Conditions
Max
0.25
0.25
5.7
6.2
Output Enable Time, Select to Bus B
0.5
5.7
6.3
Output Enable Time, IOE to Bus A, B
0.5
4.9
5.4
Output Disable Time, Select to Bus B
0.5
6.2
6.3
Output Disable Time, IOE to Bus A, B
0.5
6.0
6.1
ns
ns
ns
Figures
2, 3
VI = OPEN
VI = 7V for tPZL
Figures
2, 3
VI = OPEN for tPZH
VI = 7V for tPLZ
Figures
2, 3
VI = OPEN for tPHZ
Note 6: 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 the source (zero output impedance).
Capacitance
Symbol
Parameter
CIN
CI/O
(Note 7)
A Port
Typ
Max
Units
Control Pin Input Capacitance
3
pF
Input/Output Capacitance
13
pF
5
pF
B Port
Conditions
VCC = 5.0V
VCC, OE = 5.0V
Note 7: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested.
Undershoot Characteristic (Note 8)
Symbol
VOUTU
Parameter
Output Voltage During Undershoot
Min
Typ
2.5
VOH - 0.3
Max
Units
Conditions
V
Figure 1
Note 8: This test is intended to characterize the device’s protective capabilities by maintaining output signal integrity during an input transient voltage
undershoot event.
FIGURE 1.
Device Test Conditions
Parameter
Value
VIN
see Waveform
V
R1 = R2
100K
Ω
VTRI
11.0
V
VCC
5.5
V
www.fairchildsemi.com
Transient
Input Voltage (VIN) Waveform
Units
4
FSTU3253
AC Loading and Waveforms
Note: Input driven by 50 Ω source terminated in 50 Ω
Note: C L includes load and stray capacitance
Note: Input PRR = 1.0 MHz, tW = 500 ns
FIGURE 2. AC Test Circuit
FIGURE 3. AC Waveforms
5
www.fairchildsemi.com
FSTU3253
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Package Number M16A
16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
Package Number MQA16
www.fairchildsemi.com
6
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
Technology Description
The Fairchild Switch family derives from and embodies Fairchild’s proven switch technology used for several years in its
74LVX3L384 (FST3384) bus switch product.
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
7
www.fairchildsemi.com
FSTU3253 Dual 4:1 Multiplexer/Demultiplexer Bus Switch with −2V Undershoot Protection
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Similar pages