MDSL-00002-02
QUALITY SEMICONDUCTOR, INC.
1
QS29FCT520T, 521T, 2520T, 2521T
3
Q
QS3383
QS32383
High Speed CMOS
Bus Exchange
Switches
High Speed CMOS
Multilevel Pipeline
Registers
QS29FCT520T
QS29FCT521T
QS29FCT2520T
QS29FCT2521T
FEATURES/BENEFITS
Pin and function compatible to the Am29520
TTL-compatible input and output levels
Ground bounce controlled outputs
CMOS power levels: <7.5 mW static
Reduced output swing of 0-3.5V
Undershoot clamp diodes on all inputs
Available in DIP, ZIP, SOIC, QSOP, HQSOP
Military product compliant to MIL-STD-883
FCT-T520T/1T
FCT-T 2520T/1T
JEDEC-FCT spec compatible
Built-in 25
series resistor outputs reduce
Fastest CMOS logic family available
reflection and other system noise
A, B, and C speed grades with 6 ns tPD for C
IOL = 48 mA Com., 32 mA Mil.
IOL = 12 mA Com.
DESCRIPTION
The QS29FCT520AT/BT and QS29FCT521AT/BT provide four 8-bit registers useful for temporary storage
and for stage delays in pipelined systems. The four registers may be configured as a dual 2-level or single
4-level shift register pipeline. A single 8-bit input is provided, and any of the four registers may be selected
for gating to the single 8-bit output. The 520 and 521 differ only in how the registers are loaded in the dual 2-
rank mode, as shown in the function tables. The QS29FCT520/1 are pin and function compatible with the
Am29520/1 bipolar parts, except for higher speed and significantly lower power.
FUNCTIONAL BLOCK DIAGRAM
REGISTER A1
REGISTER
CONTROL
25
(FCT2xxx Only)
I0, I1
CLOCK
REGISTER A2
REGISTER B1
REGISTER B2
MULTIPLEXER
AND OUTPUT DRIVERS
D7-D0
Y7-Y0
S0, S1
OE