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74FR900SSC Datasheet

  • 74FR900SSC

  • 9-Bit, 3-Port Latchable Datapath Multiplexer

  • 6頁

  • FAIRCHILD

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74FR900 9-Bit, 3-Port Latchable Datapath Multiplexer
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 C
8
to A
8
or B
8
path. This is useful for control of the parity bit in systems
diagnostics.
Fairchild鈥檚 74FR25900 includes 25鈩?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:
Order Number
74FR900SSC
Package Number
MS48A
Package Description
48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Logic Symbol
Connection Diagram
Pin Description
Pin Names
LExx
OE
x
PINV
S
0
, S
1
A
0
鈥揂
8
B
0
鈥揃
8
C
0
鈥揅
8
Description
Latch Enable Inputs
Output Enable Inputs
Parity Invert Input
Select Inputs
Port A Inputs or 3-STATE Outputs
Port B Inputs or 3-STATE Outputs
Port C Inputs or 3-STATE Outputs
漏 1999 Fairchild Semiconductor Corporation
DS010990
www.fairchildsemi.com

74FR900SSC 產(chǎn)品屬性

  • Fairchild Semiconductor

  • FR

  • 5.5 V

  • 4.5 V

  • + 70 C

  • SMD/SMT

  • SSOP-48

  • Rail

  • 0 C

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