Fairchild FST16212 service manual
查询FST16212供应商
FST16212
24-Bit Bus Exchange Switch
FST16212 24-Bit Bus Exchange Switch
July 1997
Revised December 1999
General Description
The Fairchild Switc h FST16212 provides 24-bits of highspeed CMOS TTL-compatib le bus switching or exchanging. The low on resistance of the sw itch all ow s in put s to be
connected to outputs withou t adding propagation delay or
generating additional ground bounce noise.
The device operate s as a 24-bi t bu s switc h or a 12- 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
■ Zero bounce in flow-through mode.
■ Control inputs compatible with TTL level.
.
CC
Ordering Code:
Order Number Package Number Package Description
FST16212MEA MS56A 56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
FST16212MTD 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
Truth Table
S2 S1 S0
L L L Z Z Disconnect
LLHB
LHLB2ZA
LHHZB1A2 = B
HLLZB2A2 = B
H L H Z Z Disconnect
HHLB
HHHB2B
© 1999 Fairchild Semiconductor Corporation DS500038 www.fairchildsemi.com
A
1A2
ZA
1
1B2
1
Function
= B
1
1
= B
1
2
1
2
A1 = B1, A2 = B
A1 = B2, A2 = B
Pin Descriptions
Pin Name Description
S2, S1, S0 Data-select inputs
2
1
, A
A
1
2
B
, B
1
2
Bus A
Bus B
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FST16212
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
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.
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.
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 5) 4.5 4 7 Ω V
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
Increase in ICC per Input 5.5 2.5 mA One input at 3.4V
CC
(V)
010µAV
4.5 8 12 Ω V
4.0 14 20 Ω VIN = 2.4V, IIN = 15mA
TA = −40 °C to +85 °C
Typ
Min
(Note 4)
Units Conditions
Max
Other inputs at VCC or GND
= 5.5V
IN
CC
= 0V, IIN = 30mA
IN
= 2.4V, IIN = 15mA
IN
OUT
= 0
www.fairchildsemi.com 2
Loading...