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(25鈩?/div>
Series) PI74FCT2841T
Fast CMOS
Bus Interface Latches
Product Features
Product Description
Pericom Semiconductor聮s PI74FCT series of logic circuits are
produced in the Company聮s advanced 0.8 micron CMOS technology,
achieving industry leading speed grades. All PI74FCT2XXX devices
have a built-in 25-ohm series resistor on all outputs to reduce noise
because of reflections, thus eliminating the need for an external
terminating resistor.
The PI74FCT841T/843T/845T and P174FCT2841T series are buffered
interface latches. These transparent latches designed with 3-state
outputs and are designed to eliminate the extra packages required to
buffer existing latches and provide extra data width for wider address/
data paths or buses carrying parity. When Latch Enable (LE) is HIGH,
the flip-flops appear transparent to the data. The data that meets the
set-up time when LE is LOW is latched. When OE is HIGH, the bus
output is in the high impedance state.
The PI74FCT841/2841T is a 10-bit latch, the PI74FCT843T is a
9-bit latch, and the PI74FCT845T is an 8-bit latch.
聲 PI74FCT841/843/845/2841T is pin compatible with bipolar
FAST聶 Series at a higher speed and lower power
consumption
聲 25-ohm series resistor on all outputs (FCT2XXX only)
聲 TTL input and output levels
聲 Low ground bounce outputs
聲 Extremely low static power
聲 Hysteresis on all inputs
聲 Industrial operating temperature range: 聳40擄C to +85擄C
聲 Packages available:
聳 24-pin 300 mil wide plastic DIP (P)
聳 24-pin 150 mil wide plastic QSOP (Q)
聳 24-pin 150 mil wide plastic TQSOP (R)
聳 24-pin 300 mil wide plastic SOIC (S)
PI74FCT841/843/845/2842T Logic Block Diagram
D
0
PRE
D P
Q
LE
CLR
D P
LE Q
CLR
D P
LE Q
CLR
D P
LE Q
CLR
D P
LE Q
CLR
D P
LE Q
CLR
D P
LE Q
CLR
D P
LE Q
CLR
D
1
D
2
D
3
D
4
D
5
D
N鈥?
D
N
CLR
LE
OE
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
N鈥?
Y
N
1
2
3
4
5
6
7
