Asynchronous FIFO in a 20-DIP — what it does and where it fits
The 67C4033-15N is a 64-word by 5-bit asynchronous FIFO memory, designed to buffer data between two asynchronous clock domains at a 15 MHz data rate. Its 5-bit width suits narrow bus interfaces like 5 V logic-level handshake or parallel sensor readouts. The through-hole 20-DIP package fits legacy sockets, breadboards, and retrofit designs where surface-mount is not an option. Operating from a 4.5 V to 5.5 V supply and drawing 45 mA max, it is a direct fit for 5 V TTL/CMOS systems. The commercial temperature range (0°C to 70°C) limits it to indoor, controlled environments — not for automotive or industrial outdoor use.
15 MHz data rate and 64 x 5 depth — what the ratings mean
Expansion is supported in depth and width, so multiple 67C4033-15N devices can be cascaded for larger buffers. No FWFT, retransmit, or programmable flags are available — this is a basic first-in, first-out with standard flag outputs.
Lifecycle and sourcing
Note that this part is RoHS non-compliant, which may affect procurement for projects requiring lead-free assembly. For RoHS-compliant builds, verify the full order code or consider a lead-free variant if available.