2048 x 18 / 4096 x 18 Synchronous FIFOs
LH540235/45
FEATURES • Fast Cycle Times: 20/25/35 ns • Pin-Compatible Drop-In Replacements for
IDT72235B/45B FIFOs
2048...
Description
LH540235/45
FEATURES Fast Cycle Times: 20/25/35 ns Pin-Compatible Drop-In Replacements for
IDT72235B/45B FIFOs
2048 × 18 / 4096 × 18 Synchronous FIFOs
May be Cascaded for Increased Depth, or
Paralleled for Increased Width
16 mA-IOL High-Drive Three-State Outputs Five Status Flags: Full, Almost-Full, Half-Full,
Almost-Empty, and Empty; ‘Almost’ Flags are Programmable
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
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
Internal Memory Array Architecture Based on CMOS ‘Synchronous’ Enable-Plus-Clock Control at Both
Input Port and Output Port
Dual-Port SRAM Technology, 2048 × 18 or 4096 × 18
In Enhanced Operating Mode, Disabling
Three-State Outputs May be Made to Suppress Reading
Independently-Synchronized Operation of Input Port
and Output Port
Control Inputs Sampled on Rising Clock Edge Most Control Signals Assertive-LOW for
Noise Immunity
Data Retransmit Function TTL/CMOS-Compatible I/O Space-Saving 68-Pin PLCC Package; Even-Smaller
64-Pin TQFP Package
RS
RESET LOGIC
FL/RT WXI/...
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