Fairchild FST32X245 service manual
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FST32X245
16-Bit Bus Switch
FST32X245 16-Bit Bus Switch
June 2002
Revised October 2002
General Description
The Fairchild Switch F ST32X245 provides 16-b its of high
speed CMOS TTL-comp atible bus switch ing in a standa rd
flow-through mode. The low On Resistance of the switch
allows inputs to be c onnected to outputs without adding
propagation delay or generatin g additiona l ground boun ce
noise.
The device is organized as a 16-bit swi tch. When OE
LOW, the switch is ON and Port A is connecte d to P ort B.
When OE
ance state exists between the two ports.
is HIGH, the switch is OPEN and a high-imped-
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
is
■ 16-bit version of FST3245
Ordering Code:
Order Number
FST32X245QSP MQA40A 40-Lead Quarter Size Very Small Outline Package (QVSOP), JEDEC MO-154, 0.150" Wide
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
Logic Diagram
Package
Number
Package Descript ion
Connection Diagram
Pin Descriptions
Pin Name Description
OE
n
A
n
B
n
NC No Connect
© 2002 Fairchild Semiconductor Corporation DS500620 www.fairchildsemi.com
Bus Switch Enable
Bus A
Bus B
Function Table
Input OE
n
L Connect
H Disconnect
Function
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
DC Input Voltage (V
FST32X245
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
) V
< 0V −50mA
IK
IN
) Sink Current 128mA
) +/− 100mA
GND
) −65°C to +150 °C
STG
Conditions
Power Supply Operating (V
Input Voltage (V
Output Voltage (V
Input Rise and Fall Time (t
Switch Control Input 0 ns/V to 5 ns/V
Switch I/O 0 ns/V to DC
Free Air Operating Temperature (T
Note 1: The Absolute Maximum Ratings are those values beyond 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.
Note 3: Unused control inputs must be held HIGH or LOW. They may not
float.
(Note 3)
) 4.0V to 5.5V
CC
)0V to 5.5V
IN
)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
CC
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 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.
Note 6: Per V
Note 7: Per TTL driven input, contr ol pins only.
Clamp Diode Voltage 4.5 −1.2 V IIN = −18 mA
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 = 64 mA
(Note 5) 4.5 4 7 Ω V
Quiescent Supply Current (Note 6) 5.5 3 µAVIN = VCC or GND, I
Increase in I
(Note 7) Other Inputs at V
pin.
CC
per Input 5.5 2.5 mA One Input at 3.4V
CC
CC
(V)
010µAVIN = 5.5V
4.5 8 15 Ω VIN = 2.4V, IIN = 15 mA
4.0 11 20 Ω V
TA = −40 °C to +85 °C
Min Typ
(Note 4)
Units Conditions
Max
CC
= 0V, IIN = 30 mA
IN
= 2.4V, IIN = 15 mA
IN
CC
= 0
OUT
or GND
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