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LH540215 Datasheet(PDF) 1 Page - Sharp Corporation

Part # LH540215
Description  512 x 18 / 1024 x 18 Synchronous FIFO
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

LH540215 Datasheet(HTML) 1 Page - Sharp Corporation

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LH540215/25
512
× 18 / 1024 × 18 Synchronous FIFO
FEATURES
•• Fast Cycle Times: 20/25/35 ns
•• Pin-Compatible Drop-In Replacements for
IDT72215B/25B FIFOs
•• Choice of IDT-Compatible or Enhanced Operating
Mode; Selected by an Input Control Signal
•• Device Comes Up into One of Two Known Default
States at Reset Depending on the State of the
EMODE Control Input: Programming is Allowed, but
is not Required
•• Internal Memory Array Architecture Based on CMOS
Dual-Port SRAM Technology, 512
× 18 or 1024 × 18
•• ‘Synchronous’ Enable-Plus-Clock Control at Both
Input Port and Output Port
•• Independently-Synchronized Operation of Input Port
and Output Port
•• Control Inputs Sampled on Rising Clock Edge
•• Most Control Signals Assertive-LOW for
Noise Immunity
•• May be Cascaded for Increased Depth, or
Paralleled for Increased Width
•• Five Status Flags: Full, Almost-Full, Half-Full,
Almost-Empty, and Empty; ‘Almost’ Flags are
Programmable
•• In Enhanced Operating Mode, Almost-Full,
Half-Full, and Almost-Empty Flags can be Made
Completely Synchronous
•• In Enhanced Operating Mode, Duplicate Enables
for Interlocked Paralleled FIFO Operation, for
36-Bit Data Width, when Selected and
Appropriately Connected
•• In Enhanced Operating Mode, Disabling
Three-State Outputs May be Made to Suppress
Reading
•• Data Retransmit Function
•• TTL/CMOS-Compatible I/O
•• Space-Saving 68-Pin PLCC Package, and 64-Pin
TQFP Package
RESET
LOGIC
INPUT
PORT
RS
INPUT
PORT
CONTROL
LOGIC
READ
POINTER
WRITE
POINTER
DEDICATED AND
PROGRAMMABLE
STATUS FLAGS
FIFO
MEMORY ARRAY
512 x 18/1024 x 18
OUTPUT
PORT
CONTROL
LOGIC
FF
PAF
WXO/HF
RXO
/EF2
PAE
D0 - D17
WEN
WCK
Q0 - Q17
RCK
OUTPUT
PORT
REN
OE
PROGRAMMABLE
REGISTERS
EXPANSION
LOGIC
WXI/
WEN2
FL/
RT
WXO/HF
RXI/
REN2
RXO/
EF2
LD
540215-1
WXI/
WEN2
RXI/
REN2
BOLD ITALIC = Enhanced Operating Mode.
EMODE
EF
Figure 1.
LH540215/25 Block Diagram
BOLD ITALIC = Enhanced Operating Mode
1


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