Fairchild FST16292 service manual
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FST16292
12-Bit to 24-Bit Multiplexer/Demultiplexer Bus Switch
FST16292 12-Bit to 24-Bit Multiplexer/Demult iplexer Bus Switch
July 1997
Revised December 1999
General Description
The Fairchild Switch FST16 292 provides twelve 2:1 highspeed CMOS TTL-compatible multiplexer/demultiplexer
bus switches. The low on resistance of the switch allows
inputs to be connect ed to out puts wit hout adding prop agation delay or generating additional ground bounce noise.
The select pin connects the A Port to the selected B Port
output. The A
have a 500Ω pull-down resistor to ground.
Ports are not externally connected, thus
2
Features
■ 4Ω switch connection between two ports.
■ Minimal propagation delay through the switch.
■ Low l
■ Zero bounce in flow-through mode.
■ Control inputs compatible with TTL level.
■ Internal 500Ω pull-down resistor on A
.
CC
port.
2
Ordering Code:
Order Number Package Number Package Description
FST16292MEA MS56A 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
FST16292MTD MTD56 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
Logic Diagram
Connection Diagram
Pin Descriptions
Pin Name Description
SO Data-select input
A
1
B
, B
1
2
© 1999 Fairchild Semiconductor Corporation DS500104 www.fairchildsemi.com
Bus A
Bus B
Truth T able
S0 A1A
LB
HB2B
1B2
2
1
Function
A1 = B1, A2 = B
A1 = B2, A2 = B
2
1
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FST16292
DC Input Voltage (V
DC Input Diode Current (l
DC Output (I
DC V
OUT
/GND Current (ICC/I
CC
Storage Temperature Range (T
) −0.5V to +7.0V
S
) (Note 2) −0.5V to +7.0V
IN
) VIN<0V −50mA
IK
) Sink Current 128mA
) +/− 100mA
GND
) −65°C to +150 °C
STG
Conditions
Power Supply Operating (V
Input Voltage (V
IN
Output Voltage (V
Input Rise and Fall Time (t
Switch Control Input 0ns/V to 5ns/V
Switch I/O 0ns/V to DC
Free Air Operating Temperature (T
Note 1: The “Absolute Maximum Ratings” are those values bey ond which
the safety of the d evice cannot be guaranteed. The 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.
CC)
)0V to 5.5V
)0V to 5.5V
OUT
, tf)
r
) −40 °C to +85 °C
A
DC Electrical Characteristics
V
Symbol Parameter
V
IK
V
IH
V
IL
I
I
I
OZ
R
ON
I
CC
∆ I
Note 3: Typi c al values are at VCC = 5.0V and TA =+25°C
Note 4: Measured by the volta ge drop between A an d B pins at the indicated c urrent through the switch. On resistance is determined by the lower of the
voltages on the two (A or B) pins.
Clamp Diode Voltage 4.5 −1.2 V IIN = −18mA
HIGH Level Input Voltage 4.0–5.5 2.0 V
LOW Level Input Voltage 4.0–5.5 0.8 V
Input Leakage Current 5.5 ±1.0 µA0≤ VIN ≤5.5V
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤A, B ≤V
Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64mA
(Note 4) 4.5 4 7 Ω VIN = 0V, IIN = 30mA
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
Increase in I
CC
per Input 5.5 2.5 mA One input at 3.4V
CC
CC
(V)
010µAVIN = 5.5V
4.5 8 12 Ω VIN = 2.4V, IIN = 15mA
4.0 14 20 Ω VIN = 2.4V, IIN = 15mA
TA = −40 °C to +85 °C
Min
Typ
(Note 3)
Max
Units Conditions
CC
Other inputs at VCC or GND
4.0V to 5.5V
= 0
OUT
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