SN54LS670

The SN54LS670 is a type of 4-by-4 register files with 3 state output. The register file is organized as 4 words of 4 bit each and separate on-chip decoding is offered for addressing the four word locations to either write-in or retrieve d ata.

Features of SN54LS670 are: (1)separate read/write addressing permits simultaneous reading and writing; (2)fast ac cess times: typically 20ns; (3)organized as 4 words of 4 bits; (4)expandable to 512 words of n-bits; (5)for use as: s cratch-pad memory, buffer storage between processors, bit storage in fast multiplication designs; (6)3 state output s; (7)open-collector outputs.

The absolute maximum ratings and electrical characteristics of the SN54LS670 can be summarized as: (1)supply volt age: 7V; (2)input voltage: 7V;(3)operating free air temperature range:-55 to 125;(4)storage temperature rang:-65 to 150; (5)off-state output voltage: 5.5V. Electrical characteristics: (1)high-level input voltage: 2V min; (2)low-level input voltage: 0.7V max; (3)input clamp voltage(VCC=min, I1=-18mA): -1.5V max; (4)low level input current(VC C=max, V1=0.4V):-0.4mA max; (5)short-circuit output current(VCC=max):-30mA min and-130mA max; (6)supply cur rent(VCC=max): 30mA typ and 50mA max, etc.