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FSTU6800MTC

P1-P3P4-P5
© 2000 Fairchild Semiconductor Corporation DS500194 www.fairchildsemi.com
December 1998
Revised
October 2006
FSTU6800 10-Bit Bus Switch with Precharged Outputs
FSTU6800
10-Bit Bus Switch with Precharged Outputs
and
−2V Undershoot Protection
General Description
The Fairchild Switch FSTU6800 provides 10-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
additional ground bounce noise. Both the A Ports and the B
Ports have “undershoot hardened” circuit protection to sup-
port an extended input range to 2.0V below ground. Fair-
child’s integrated Undershoot Hardened Circuit (UHC
®)
senses undershoot at the I/Os, and responds by preventing
voltage differentials from developing and turning on the
switch. The device also precharges the B Port to a select-
able bias voltage (BiasV) to minimize live insertion noise.
The device is organized as a 10-bit switch with a bus
enable (OE
) signal. 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 the B Port is precharged to BiasV
through an equivalent 10-k
Ω resistor.
Features
■ 4Ω switch connection between two ports.
■ Undershoot Hardened to -2.0V.
■ Soft enable turn-on to minimize bus-to-bus charge
sharing during enable.
■ Low l
CC
.
■ Zero bounce in flow-through mode.
■ Output precharge to minimize live insertion noise.
■ Control inputs compatible with TTL level.
■ See Applications Note AN-5008 for details.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth Table
UHC® is a registered trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
FSTU6800WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
FSTU6800QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FSTU6800MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Name Description
OE
Bus Switch Enable
ABus A
BBus B
BiasV Bus B Voltage Bias
OE
B
0
–B
9
Function
LA
0
–A
9
Connect
HBiasV Precharge
www.fairchildsemi.com 2
FSTU6800
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 3)
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 ratings.
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
Note 4: 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.
Note 5: Typical values are at V
CC
= 5.0V and T
A
= +25°C
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Switch Voltage (V
S
) −2.0V to +7.0V
Bias V Voltage Range
−0.5V to +7.0V
DC Input Voltage (V
IN
) (Note 2) −0.5V to +7.0V
DC Input Diode Current (l
IK
) V
IN
< 0V −50mA
DC Output (I
OUT
) Sink Current 128mA
DC V
CC
/GND Current (I
CC
/I
GND
) +/− 100mA
Storage Temperature Range (T
STG
) −65°C to +150 °C
Power Supply Operating (V
CC
) 4.0V to 5.5V
Precharge Supply (BiasV) 1.5V to V
CC
Input Voltage (V
IN
)0V to 5.5V
Output Voltage (V
OUT
)0V to 5.5V
Input Rise and Fall Time (t
r
, t
f
)
Switch Control Input 0 nS/V to 5 nS/V
Switch I/O 0nS/V to DC
Free Air Operating Temperature (T
A
) −40 °C to +85 °C
Symbol Parameter
V
CC
(V)
T
A
= −40 °C to +85 °C
Units Conditions
Min Typ
(Note 5)
Max
V
IK
Clamp Diode Voltage 4.5 −1.2 V I
IN
= −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 ≤ V
IN
≤ 5.5V
I
O
Output Current 4.5 0.25 mA BiasV = 2.4V, B = 0
I
OZ
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A ≤ V
CC
, V
IN
= V
IH
R
ON
Switch On Resistance 4.5 4 7 Ω V
S
= 0V, I
IN
= 64 mA
(Note 4) 4.5 4 7 Ω V
S
= 0V, I
IN
= 30 mA
4.5 8 15 Ω V
S
= 2.4V, I
IN
= 15 mA
4.0 11 20 Ω V
S
= 2.4V, I
IN
= 15 mA
I
CC
Quiescent Supply Current 5.5 3 µAV
S
= V
CC
or GND, I
OUT
= 0
∆ I
CC
Increase in I
CC
per Input 5.5 2.5 mA OE input at 3.4V
Other inputs at V
CC
or GND
I
BIAS
Bias Pin Leakage Current 5.5 ±1.0 µAOE = 0V, B = 0V, BiasV = 5.5V
I
OZU
Switch Undershoot Current 5.5 100 µAI
IN
= −20 mA, OE = 5.5V, V
OUT
≥ V
IH
V
IKU
Voltage Undershoot 5.5 −2.0 V 0.0 mA ≥ I
IN
≥ −50 mA, OE = 5.5V
3 www.fairchildsemi.com
FSTU6800
AC Electrical Characteristics
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 50 pF load capacitance, when driven by an ideal voltage the source (zero output impedance).
Capacitance (Note 7)
Note 7: T
A
= +25°C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50 Ω source terminated in 50 Ω, RU = RD = 500 Ω
Note: C
L
includes load and stray capacitance, C
L
= 50 pF
Note: Input PRR = 1.0 MHz, t
W
= 500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
Symbol Parameter
T
A
= −40 °C to +85 °C,
C
L
= 50 pF, RU = RD = 500Ω
Units Conditions Figure No.
V
CC
= 4.5 – 5.5V V
CC
= 4.0V
Min Max Min Max
t
PHL
,t
PLH
Prop Delay Bus to Bus (Note 6) 0.25 0.25 ns V
I
= OPEN Figures 1, 2
t
PZH
Output Enable Time 7.0 30.0 35.0 ns V
I
= OPEN
BiasV = GND
Figures 1, 2
t
PZL
7.0 30.0 35.0 ns V
I
= 7V
BiasV = 3V
t
PHZ
Output Disable Time 1.0 6.1 6.5 ns V
I
= OPEN
BiasV = GND
Figures 1, 2
t
PLZ
1.0 7.3 6.8 ns V
I
= 7V
BiasV = 3V
Symbol Parameter Typ Max Units Conditions
C
IN
Control Pin Input Capacitance 3 pF V
CC
= 5.0V
C
I/O
Input/Output Capacitance 5 pF V
CC
, OE = 5.0V
P1-P3P4-P5

FSTU6800MTC

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Manufacturer:
ON Semiconductor / Fairchild
Description:
Digital Bus Switch ICs 10-Bit Bus Switch
Lifecycle:
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