FST16209MEA
© 1999 Fairchild Semiconductor Corporation DS500056 www.fairchildsemi.com
September 1997
Revised December 1999
FST16209 18-Bit Bus Exchange Switch
FST16209
18-Bit Bus Exchange Switch
General Description
The Fairchild Switc h FST16209 provides 18-bits of highspeed CMOS TTL-compatible bus switching or exchanging. The low on resistance of the swi tch allows inputs to be
connected to outputs without add ing propagation delay or
generating additional ground bounce noise.
The device operates as a 18-bit bus switch or a 9- bit bus
exchanger, which allows data exchang e between the four
signal ports via the data-select terminals.
Features
■ 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.
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
Truth Table
Connection Diagram
Pin Descriptions
Order Number Package Number Package Description
FST16209MEA MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
FST16209MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
S2 S1 S0 A1A
2
Function
L L L Z Z Disconnect
LLHB
1
ZA
1
= B
1
LHLB2ZA
1
= B
2
LHHZB1A2 = B
1
HLLZB2A2 = B
2
H L H Z Z Disconnect
HHLB
1B2
A1 = B1, A2 = B
2
HHHB2B
1
A1 = B2, A2 = B
1
Pin Name Description
S2, S1, S0 Data-select inputs
A
1
, A
2
Bus A
B
1
, B
2
Bus B
www.fairchildsemi.com 2
FST16209
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 3)
Note 1: The “Absolute Maximum Ratings” are those values beyon d 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 rating.
The “Recomme nded O peratin g Cond itions ” table will defin e the condition s
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
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
Input Voltage (V
IN
)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)
T
A
= −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
010µAV
IN
= 5.5V
I
OFF
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ 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 12 Ω VIN = 2.4V, IIN = 15mA
4.0 14 20 Ω V
IN
= 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 V
CC
or GND
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