PI74FCT16260T
PI74FCT162260T
Fast CMOS 12-Bit Tri-Port
Bus Exchanger
Product Features
Product Description
Common Features
PericomSemiconductorsPI74FCTseriesoflogiccircuits
are produced in the Companys advanced 0.6 micron
CMOStechnology,achievingindustryleadingspeedgrades.
PI74FCT16260 and PI74FCT162260 are high-speed,
low power devices with high current drive.
The FCT16260AT/CT and the FCT162260AT/CT Tri-
Port Bus Exchangers are high-speed 12-bit latched bus
multiplexers/ transceivers for use in high speed
microprocessorapplications.TheseBusExchangerssupport
memory interleaving with latched outputs on the B-ports
and address multiplexing with latched inputs on the B-
ports.
V = 5V ± 10%
CC
Typical tsk (o) (Output Skew) < 250ps, clocked mode
Extended range of 40°C to +85°C
Hysteresis on all inputs
PI74FCT16260T Features
High output drive: I = 32mA; I = 64mA
OH
OL
The Tri-port Bus Exchanger has three 12-bit ports. Data
may be transferred between the A-port and either/both of
the B-ports.
Power off disable outputs permit live insertion
Typical V (Output Ground Bounce)
OLP
< 1.0V at V = 5V, T = 25°C
CC
A
The latch enable (LE1B, LE2B, LEA1B and LEA2B)
inputs control data storage. When a latch-enable input is
HIGH, thelatchistransparent. Whenthelatchenableinput
isLOW, thedataattheinputislatchedandremainslatched
until the latch enable input is returned HIGH. Independent
output enables (OE1B and OE2B allow reading from one
port while writing to the other port.
PI74FCT162260T Features
Balanced output drive: I /I = 24mA
OL OH
Typical V
(Output Ground Bounce)
OLP
< 0.6V at V = 5V, T = 25°C
CC
A
Series current limiting resistors
Packages available:
The FCT16260AT/CT are ideally suited for driving high
capacitance loads and low impedance backplanes. The
outputbuffersaredesignedwithpoweroffdisablecapability
to allow live insertion of boards when used as backplane
drivers.
56-pin 240 mil wide TSSOP (A56)
56-pin 300 mil wide SSOP (V56)
Logic Block Diagram
The FCT162260AT/CT have balanced output drive with
current limiting resistors. This offers low ground bounce,
minimal undershoot, and controlled output fall times
reducing the need for external series terminating resistors.
PS8307A
11/17/98
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