512 × 32 × 2 CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY

The SN74ACT3638 is a high-speed, low-power CMOS clocked bidirectional FIFO memory. It supports Clock frequencies up to 67 MHz and has read access times as fast as 11 ns. Two independent 512 32 dual-port SRAM FIFOs on the chip Buffer data in opposite directions. The FIFO memory buffering data from port A to port B has retransmit capability, which allows previously read data to be accessed again. Each FIFO has flags to indicate empty and full conditions and two programmable flags (almost full and almost empty) to indicate when a selected number of words is stored in memory. Communication between each port CAN bypass the FIFOs via two 32-bit mailbox Registers Each mailbox Register has a flag to signal when new mail has been stored. Two or more devices CAN be used in parallel to create wider datapaths. The SN74ACT3638 is a clocked FIFO which means each port employs a synchronous Interface All data transfers through a port are gated to the low-to-high transition of a continuous (free-running) port Clock by enable signals. The continuous Clocks for each port are independent of one another and CAN be asynchronous or coincident. The enables for each port are arranged to provide a simple bidirectional Interface between Microprocessors and/or buses with synchronous control. The input-ready (IRA, IRB) flags and almost-full (AFA, AFB) flags of the SN74ACT3638 are two-stage synchronized to the port Clock that writes data to its array. The output-ready (ORA, ORB) flags and almost-empty (AEA, AEB) flags of the SN74ACT3638 are two-stage synchronized to the port Clock that reads data from its array. Offsets for the almost-full and almost-empty flags of both FIFOs CAN be programmed from port A. The SN74ACT3638 is characterized for operation from 0C to 70C By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74ACT3638-30PQR Texas Instruments 512 X 32 BI-DIRECTIONAL FIFO, 15 ns, PQFP132, PLASTIC, BQFP-132
SN74ACT3638-30PQ Texas Instruments 512 x 32 x 2 bidirectional synchronous FIFO memory 132-BQFP 0 to 70
SN74ACT3638-30PCB Texas Instruments 512 x 32 x 2 bidirectional synchronous FIFO memory 120-HLQFP 0 to 70
SN74ACT3638-30PCBR Texas Instruments 512 X 32 BI-DIRECTIONAL FIFO, 15 ns, PQFP120, PLASTIC, HLQFP-120
SN74ACT3638-20PCB Texas Instruments 512 x 32 x 2 bidirectional synchronous FIFO memory 120-HLQFP 0 to 70
SN74ACT3638-15PCBR Texas Instruments 512X32 BI-DIRECTIONAL FIFO, 11ns, PQFP120, PLASTIC, HLQFP-120
SN74ACT3638-15PQ Texas Instruments 512 x 32 x 2 bidirectional synchronous FIFO memory 132-BQFP 0 to 70
SN74ACT3638-20PCBR Texas Instruments 512 X 32 BI-DIRECTIONAL FIFO, 13 ns, PQFP120, PLASTIC, HLQFP-120
SN74ACT3638-15PQR Texas Instruments 512X32 BI-DIRECTIONAL FIFO, 11ns, PQFP132, PLASTIC, BQFP-132
SN74ACT3638-20PQ Texas Instruments 512 x 32 x 2 bidirectional synchronous FIFO memory 132-BQFP 0 to 70
SN74ACT3638 's PackagesSN74ACT3638 's pdf datasheet



SN74ACT3638 Pinout, Pinouts
SN74ACT3638 pinout,Pin out
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