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74FR25900 Datasheet

  • 74FR25900

  • 9-Bit, 3-Port Latchable Datapath Multiplexer with 25W Output...

  • 7頁

  • FAIRCHILD

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74FR25900 9-Bit, 3-Port Latchable Datapath Multiplexer
July 1992
Revised August 1999
74FR25900
9-Bit, 3-Port Latchable Datapath Multiplexer
with 25鈩?Output Series Resistors
General Description
The 74FR25900 is a data bus multiplexer routing any of
three 9-bit ports to any other one of the three ports. Read-
back of data latched from any port onto itself is also possi-
ble. The 74FR25900 maintains separate control of all latch-
enable, output enable and select inputs for maximum flexi-
bility. 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.
This device includes 25鈩?resistors in series with A and B
Port outputs. Resistors minimize undershoot and ringing
which may damage or corrupt sensitive device inputs
driven by these ports.
Features
s
25鈩?series resistors in the port A and B outputs elimi-
nate the need for external resistors when driving MOS
inputs such as DRAM arrays
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
74FR900 option available without output series resistors
Ordering Code:
Order Number
74FR25900SSC
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
DS011500
www.fairchildsemi.com

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