IDT73720A

Features:

• High-speed 16-bit bus exchange for interbus communication in the following environments:
   -  Multi-way interleaving memory
   -  Multiplexed address and data busses
• Direct interface to R3051 family RISChipSet
   -  R3051 family of integrated RISController CPUs
   -  R3721 DRAM controller
• Data path for read and write operations
• Low noise 12mA TTL level outputs
• Bidirectional 3-bus architecture: X, Y, Z
   -  One CPU bus: X
   -  Two (interleaved or banked) memory busses:Y & Z
   -  Each bus can be independently latched
• Byte control on all three busses
• Source terminated outputs for low noise and undershoot control
• 68-pin PLCC and 80-pin PQFP package
• High-performance CMOS technology.


Specifications

Symbol	Rating	Com'l	Mil	Unit
VTERM	Terminal Voltage with Respect to GND	0.5 to +7.0	0.5 to+7.0	V
TA	Operating	0 to +70	55 to +125	°C
TBIAS	Temperature Under Bias	55 to +125	65 to +135	°C
TSTG	Storage Temperature	55 to +125	65 to +125	°C
PT	Power Dissipation	1.0	1.0	W
IOUT	DC Output Current	50	50	mA

Description

The IDT73720A Bus Exchanger is a high speed 16-bit bus exchange device intended for inter-bus communication in
interleaved memory systems and high performance multiplexed address and data busses.
The Bus Exchanger is responsible for interfacing between the CPU A/D bus (CPU address/data bus) and multiple
memory data busses.

The IDT73720A uses a three bus architecture (X, Y, Z), with control signals suitable for simple transfer between the CPU
bus (X) and either memory bus (Y or Z).  The Bus Exchanger features independent read and write  latches for each memory bus, thus supporting a variety of memory strategies. All three ports support byte enable to independently enable upper and lower bytes.