FST32X245QSPX

© 2002 Fairchild Semiconductor Corporation DS500620 www.fairchildsemi.com
June 2002
Revised October 2002
FST32X245 16-Bit Bus Switch
FST32X245
16-Bit Bus Switch
General Description
The Fairchild Switch FST32X245 provides 16-bits of high
speed CMOS TTL-compatible bus switching in a standard
flow-through mode. The low On Resistance of the switch
allows inputs to be connected to outputs without adding
propagation delay or generating additional ground bounce
noise.
The device is organized as a 16-bit switch. 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 a high-imped-
ance state exists between the two ports.
Features
4 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
16-bit version of FST3245
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
Function Table
Order Number
Package
Number
Package Description
FST32X245QSP MQA40A 40-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide
Pin Name Description
OE
n
Bus Switch Enable
A
n
Bus A
B
n
Bus B
NC No Connect
Input OE
n
Function
L Connect
H Disconnect
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FST32X245
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 rating.
The Recommended Operating Conditions table 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: Typical values are at V
CC
= 5.0V and T
A
= +25°C
Note 5: 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 6: Per V
CC
pin.
Note 7: Per TTL driven input, control pins only.
Supply Voltage (V
CC
) 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
) 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
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 0 ns/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 I
IN
= 18 mA
V
IH
HIGH Level Input Voltage 4.05.5 2.0 V
V
IL
LOW Level Input Voltage 4.05.5 0.8 V
I
I
Input Leakage Current 5.5 ±1.0 µA0 V
IN
5.5V
010µAV
IN
= 5.5V
I
OZ
OFF-STATE Leakage Current 5.5 ±1.0 µA0 A, B V
CC
R
ON
Switch On Resistance 4.5 4 7 V
IN
= 0V, I
IN
= 64 mA
(Note 5) 4.5 4 7 V
IN
= 0V, I
IN
= 30 mA
4.5 8 15 V
IN
= 2.4V, I
IN
= 15 mA
4.0 11 20 V
IN
= 2.4V, I
IN
= 15 mA
I
CC
Quiescent Supply Current (Note 6) 5.5 3 µAV
IN
= V
CC
or GND, I
OUT
= 0
I
CC
Increase in I
CC
per Input 5.5 2.5 mA One Input at 3.4V
(Note 7) Other Inputs at V
CC
or GND
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FST32X245
AC Electrical Characteristics
Note 8: 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 50pF load capacitance, when driven by an ideal voltage the source (zero output impedance).
Capacitance (Note 9)
Note 9: T
A
= +25°C, f = 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50 source terminated in 50
Note: C
L
includes load and stray capacitance
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
= 50pF, RU = RD = 500
Units Conditions
Figure
Number
V
CC
= 4.5 – 5.5V V
CC
= 4.0V
Min Max Min Max
t
PHL
, t
PLH
Propagation Delay Bus to Bus
(Note 8)
0.25 0.25 ns V
I
= OPEN Figures
1, 2
t
PZH
, t
PZL
Output Enable Time 1.5 5.9 6.4 ns V
I
= 7V for t
PZL
Figures
1, 2
V
I
= OPEN for t
PZH
t
PHZ
, t
PLZ
Output Disable Time 1.5 6.0 5.7 ns V
I
= 7V for t
PLZ
Figures
1, 2
V
I
= OPEN for t
PHZ
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

FST32X245QSPX

Mfr. #:
Manufacturer:
ON Semiconductor / Fairchild
Description:
Digital Bus Switch ICs 16-Bit Bus Switch
Lifecycle:
New from this manufacturer.
Delivery:
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