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74FR900 Datasheet(PDF) 1 Page - Fairchild Semiconductor

No. de pieza 74FR900
Descripción Electrónicos  9-Bit, 3-Port Latchable Datapath Multiplexer
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74FR900 Datasheet(HTML) 1 Page - Fairchild Semiconductor

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© 1999 Fairchild Semiconductor Corporation
DS010990
www.fairchildsemi.com
May 1992
Revised August 1999
74FR900
9-Bit, 3-Port Latchable Datapath Multiplexer
General Description
The 74FR900 is a data bus multiplexer routing any of three
9-bit ports to any other one of the three ports. Readback of
data latched from any port onto itself is also possible. The
74FR900 maintains separate control of all latch-enable,
output enable and select inputs for maximum flexibility.
PINV allows inversion of the data from the C8 to A8 or B8
path. This is useful for control of the parity bit in systems
diagnostics.
Fairchild’s 74FR25900 includes 25
Ω resistors in series with
port A and B outputs. Resistors minimize undershoot and
ringing which may damage or corrupt sensitive device
inputs driven by these ports.
Features
s 9-bit data ports for systems carrying parity bits
s Readback capability for system self checks.
s Independent control lines for maximum flexibility
s Guaranteed multiple output switching and 250 pF load
delays
s Outputs optimized for dynamic bus drive capability
s PINV parity control facilitates system diagnostics
s FR25900 resistor option for driving MOS inputs such as
DRAM arrays
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Pin Description
Connection Diagram
Order Number
Package Number
Package Description
74FR900SSC
MS48A
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
Pin Names
Description
LExx
Latch Enable Inputs
OEx
Output Enable Inputs
PINV
Parity Invert Input
S0, S1
Select Inputs
A0–A8
Port A Inputs or 3-STATE Outputs
B0–B8
Port B Inputs or 3-STATE Outputs
C0–C8
Port C Inputs or 3-STATE Outputs


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