QS54/74FCT240T, 244T, 2240T, 2244T
Q
Q
UALITY
S
EMICONDUCTOR,
I
NC.
FEATURES/BENEFITS
High-Speed CMOS
8-Bit
Buffers/Line Drivers
DESCRIPTION
QS54/74FCT240T
QS54/74FCT244T
QS54/74FCT2240T
QS54/74FCT2244T
鈥?Pin and function compatible to the 74F240/4
74FCT240/4 and 74ABT240/4
鈥?Industrial temperature 鈥?0擄C to 85擄C
鈥?CMOS power levels: <7.5mW static
鈥?Available in DIP, SOIC, QSOP, ZIP, HQSOP
鈥?Undershoot clamp diodes on all inputs
鈥?TTL-compatible input and output levels
鈥?Ground bounce controlled outputs
鈥?Reduced output swing of 0-3.5V
鈥?Military product compliant to MIL-STD-883,
Class B
FCT-T 240T, 244T
鈥?JEDEC-FCT spec compatible
鈥?Std. thru D speed grades with 3.8ns t
PD
for D
鈥?I
OL
= 64mA Ind., 48mA Mil.
FCT-T 2240T, 2244T
鈥?Built-in 25鈩?series resistor outputs reduce
reflection and other system noise
鈥?Std. thru C speed grades with 4.1ns t
PD
for C
鈥?I
OL
= 12mA Ind.
The FCT240T and FCT244T are 8-bit buffers/line
drivers with three-state outputs that are ideal for
driving high-capacitance loads as in memory ad-
dress and data buses. The FCT2240T and FCT2244T
are 25鈩?resistor output versions useful for driving
transmission lines and reducing system noise. The
2240 and 2244 series parts can replace the 240/244
series to reduce noise in an existing design. All inputs
have clamp diodes for undershoot noise suppres-
sion. All outputs have ground bounce suppression
(see QSI Application Note AN-001), and outputs will
not load an active bus when V
CC
is removed from the
device.
om
C
ny
pa
Figure 1. Functional Block Diagram
FCT240
FCT2240
o
N
an
w
1G(1)
1A1(2)
1A2(4)
1A3(6)
1A4(8)
FCT244
FCT2244
1Y1(18)
1Y2(16)
1Y3(14)
1Y4(12)
1G(1)
1A1(2)
1A2(4)
1A3(6)
1A4(8)
1Y1(18)
1Y2(16)
1Y3(14)
1Y4(12)
2G(19)
2A1(11)
2A2(13)
2A3(15)
2A4(17)
2Y1(9)
2Y2(7)
2Y3(5)
2Y4(3)
2G(19)
2A1(11)
2A2(13)
2A3(15)
2A4(17)
2Y1(9)
2Y2(7)
2Y3(5)
2Y4(3)
Note:
Pin 19 is
2G
on the FCT244.
MDSL-00011-04
DECEMBER 28, 1998
QUALITY SEMICONDUCTOR, INC.
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