Fairchild Semiconductor FST6800CW, FST6800WMX, FST6800WM, FST6800QSCX, FST6800QSC Datasheet
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© 1999 Fairchild Semiconductor Corporation DS500022 www.fairchildsemi.com
June 1997
Revised December 1999
FST6800 10-Bit Bus Switch with Pre-Charged Outputs
FST6800
10-Bit Bus Switch with Pre-Charged Outputs
General Description
The Fairchild Switch FST6800 provides 10-bits of highspeed CMOS TTL-comp atible bus switching. The low on
resistance of the switch allows inp uts to be connected to
outputs without adding propagation delay or generating
additional ground bounce noise. The device precharges
the B Port to a sele ctable b ias v oltage (BiasV) to minimi ze
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 connect ed to Po rt B. Whe n OE
is HIGH, the
switch is OPEN and the B Port is precharged to BiasV
through an equivalent 10-kΩ resistor.
Features
■ 4Ω switch connection between two ports.
■ Minimal propagation delay through the switch.
■ Low l
CC
.
■ Zero bounce in flow-through mode.
■ Output precharge to minimize live insertion noise.
■ Control inputs compatible with TTL level.
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.
Logic Diagram
Pin Descriptions
Connection Diagram
Truth Table
Order Number Package Number Package Description
FST6800WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
FST6800QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
FST6800MTC 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
OE B0–B
9
Function
LA
0–A9
Connect
HBiasV Precharge
www.fairchildsemi.com 2
FST6800
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 dev ice cannot be guaranteed. T he device sh ould not be
operated at these limit s. The parametric values defin ed in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The Recommende d Opera ting Condit ions table s will de fine the co nditions
for actual device operation.
Note 2: The input and output ne gative vo ltage ra tings may be excee ded 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: Typi c al values are at VCC = 5.0V and TA= +25°C
Note 5: Measured by the volta ge drop between A and B pi ns at th e indicated current through the switch. On resistance is determined 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
) −0.5V to +7.0V
Bias V Voltage Range −0.5V to +6.0V
DC Input Voltage (V
IN
) (Note 2) −0.5V to +7.0V
DC Input Diode Current (l
IK
) VIN<0V −50mA
DC Output (I
OUT
) Sink Current 128mA
DC V
CC
/GND Current (ICC/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 (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
V
CC
(V)
TA = −40 °C to +85 °C
Units Conditions
Min
Typ
(Note 4)
Max
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
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
R
ON
Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64mA
(Note 5) 4.5 4 7 Ω V
IN
= 0V, IIN = 30mA
4.5 8 15 Ω V
IN
= 2.4V, IIN = 15mA
4.0 11 20 Ω VIN = 2.4V, IIN = 15mA
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
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