Datasheet FSTU32160AMTDX, FSTU32160AMTD Datasheet (Fairchild Semiconductor)

© 2000 Fairchild Semiconductor Corporation DS500258 www.fairchildsemi.com

June 1999
Revised March 2000

FSTU32160A 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch with −2V Undershoot Protection

FSTU32160A
16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch

with −2V Undershoot Protection

General Description

The Fairchild Switch FSTU32160A is a 16-bit to 32-bit
high-speed CMOS TTL-compatible multiplexer/demulti­plexer bus switch. The low on resistance of the switch
allows inputs to be c onnected to outputs without adding
propagation delay or generatin g additiona l ground boun ce
noise.

The device can be used in app lications where two buses
need to be addressed simultaneously. The FSTU32160A is
designed so that the A Port de multiplexe s into B

1

or B2 or

both. The A and B Ports are “under shoot hardened” with
UHC protection to support an e xtended range to 2.0V
below ground. Fairchi ld’s integ rated U nde rshoot Hard ened
Circuit, UHC senses undershoot at the I/O’s, and responds
by preventing voltage differentials from developing and
turning on the switch.

Two select (SEL

1

, SEL2) inputs provide switch enabl e co n-

trol. When SEL

1

, SEL2 are HIGH, the devic e precharges

the B Port to a selectable bias voltage (Bias V) to minimize
live insertion noise.

Features

■ Undershoot hardened to −2V (A and B Ports).

■ 4Ω switch connection between two ports.

■ Minimal propagation delay through the switch.

■ Low l

CC

.

■ Zero bounce in flow-through mode.

■ Control inputs compatible with TTL level.

■ See Applications Note AN-5008 for details

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

UHC is a trademark of Fairc hild Semiconductor C orporation.

Order Number Package Number Package Description

FSTU32160A MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

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FSTU32160A

Connection Diagram Pin Descriptions

Tr uth Table

Logic Diagram

Pin Name Description

SEL

1

, SEL

2

Select Inputs

ABus A

B

1

, B

2

Bus B

Inputs

Function

SEL

1

SEL

2

LH x A = x B

1

HL x A = x B

2

LLx A = x B1 and x B

2

H H x B1, x B2 = BiasV

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FSTU32160A

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

(Note 4)

Note 1: The “Absolute Maximum Ratings ” are those val ues beyond w hich
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 “Recommend ed O peratin g Cond itions” t able w ill defin e the condition s
for actual device operation.

Note 2: V

S

is the voltage observed/applied at either the A or B Ports across
the switch.
Note 3: The input and output negativ e voltage ra tings ma y be excee ded if

the input and output diode current ratings are observed.
Note 4: Unused control inputs m ust be held HIGH o r LOW. They m ay n ot

float.

DC Electrical Characteristics

Note 5: Typical values are at VCC = 5.0V and TA = +25°C
Note 6: Measured by t he v oltage drop between A and B pins at the indicated c urrent through the swi tch. On resistance is det ermined by the lower of the

voltages on the two (A or B) pins.

Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V

S

) (Note 2) −2.0V to +7.0V
BiasV Voltage Range −0.5V to +7.0V
DC Input Control Pin Voltage

(V

IN

) (Note 3) −0.5V to +7.0V

DC Input Diode Current (l

IK

) V

IN

< 0V −50 mA

DC Output Current (I

OUT

)128 mA

DC V

CC

/GND Current (ICC/I

GND

) +/− 100 mA

Storage Temperature Range (T

STG

) −65°C to +150 °C

Power Supply Operating (V

CC

) 4.0V to 5.5V

Precharge S upply (Bias V) 1 .5 to V

CC

Input Voltage (VIN) 0V to 5.5V
Output Voltage (V

OUT

) 0V to 5.5V

Input Rise and Fall Time (t

r

, tf)
Switch Control Input 0nS/V to 5nS/V
Switch I/O 0nS/V to DC

Free Air Operating Temperature (T

A

) −40 °C to +85 °C

Symbol Parameter

TA = −40 °C to +85 °C

Units ConditionsV

CC

Min Typ Max

(V) (Note 5)

V

IK

Clamp Diode Voltage 4.5 −1.2 V IIN = −18mA

V

IH

HIGH Level Input Voltage 4.0–5.5 2.0 V

V

IL

LOW Level Input Voltage 4.0–5.5 0.8 V

I

I

Input Leakage Current 5.5 ±1.0 µA0 ≤ VIN ≤ 5.5V

010µAVIN = 5.5V

I

O

Output Current 4.5 0.25 mA BiasV = 2.4V

BX = 0

I

OZH

, I

OZL

OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A ≤ VCC, V

BiasV1 = BiasV2 = 5.5V

I

OZH

, I

OZL

OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ B ≤ VCC, V

BiasV1 = BiasV2 = Floating

R

ON

Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64 mA
(Note 6) 4.5 4 7 Ω VIN = 0V, IIN = 30 mA

4.5 8 14 Ω VIN = 2.4V, IIN = 15 mA

4.0 11 20 Ω VIN = 2.4V, IIN = 15 mA

I

CC

Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I

OUT

= 0

∆ I

CC

Increase in I

CC

per Input 5.5 2.5 mA One input at 3.4V

Other inputs at VCC or GND

I

BIAS

Bias Pin Leakage Current 5.5 ±1.0 µASEL1, SEL2 = 0V

BX = 0V, BiasVX = 5.5V

V

IKU

Voltage Undershoot 5.5 −2.0 V 0.0 mA ≥ IIN ≥ −50 mA

SEL1, SEL2 = 5.5V

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FSTU32160A

AC Electrical Characteristics

Note 7: 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 sw it c h and the 50pF load capa c it ance, when driven by an ideal voltage source (z ero output impedance).

Capacitance (Note 8)

Note 8: TA = +25°C, f = 1 Mhz, Capacitance is ch aracterized but not teste d.

Undershoot Characteristic (Note 9)

Note 9: This is intended to characterize the device’s protective capabilities by maintaining output signal integrity during an input transient voltage und ershoot

event.

FIGURE 1.

Device Test Conditions Tr ansient

Input Voltage (V

IN

) Waveform

Symbol Parameter

TA = −40 °C to +85 °C,

CL = 50 pF, RU= RD = 500Ω

Units Conditions Figure No.

VCC = 4.5 − 5.5V VCC = 4.0V

Min Max Min Max

t

PHL

, t

PLH

A or B, to B or A (Note 7) 0.25 0.25 ns VI = OPEN Figure 2

Figure 3

t

PZH

Output Enable Time,

0.5 4.0 4.5 ns

VI = OPEN for t

PZH

Figure 2
Figure 3

SEL to A, B BiasV = GND

t

PZL

Output Enable Time,

1.0 4.8 5.5 ns

VI = 7V for t

PZL

Figure 2
Figure 3

SEL to A, B BiasV = 3V

t

PHZ

Output Disable Time,

1.0 5.9 6.9 ns

VI = Open for t

PHZ

Figure 2
Figure 3

SEL to A, B BiasV = GND

t

PLZ

Output Disable Time,

1.0 7.4 7.0 ns

VI = 7V for t

PLZ

Figure 2
Figure 3

SEL to A, B BiasV = 3V

Symbol Parameter Typ Max Units Conditions

C

IN

Control pin Input Capacitance 4 pF VCC = 5.0V

C

I/O OFF

Input/Output Capacitance “OFF State” 8 pF VCC = 5.0V, Switch OFF

Symbol Parameter Min Typ Max Units Conditions

V

OUTU

Output Voltage During Undershoot 2.5 VOH − 0.3 V Figure 1

Parameter Value Units

V

IN

See Waveform V

R1 - R

2

100K Ω

V

TRI

11.0 V

V

CC

5.5 V

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FSTU32160A

AC Loading and Waveforms

Note: Input driven by 50 Ω source terminated in 50Ω
Note: C

L

includes load and stray capacitance, CL = 50 pF

Note: Input PRR = 1.0 MHz, t

W

= 500 ns

FIGURE 2. AC Test Circuit

FIGURE 3. AC Waveforms

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FSTU32160A 16-Bit to 32-Bit Multiplexer/Demultiplexer Bus Switch with −2V Undershoot Protection

Physical Dimensions inches (millimeters) unless otherwise noted

56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Package Number MTD56

Technology Description

The Fairchild Switch family derives from and embodies Fairchild’s proven switch technology us ed for several years in its
74LVX3L384 (FST3384) bus switch product.

Fairchild does not assume any responsibility for use of any circuitry described, no circuit pate nt 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 support devices or systems are 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 rea­sonably expected to result in a significant inju ry to the
user.

2. A critical component i n any compon ent of a lif e support
device or system whose failu re to perform can be rea­sonably expected to ca use the fa i lure of the life su pp ort
device or system, or to affect its safety or effectiveness.

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