UPD4664312-X Datasheet, PDF (8/36 Pages) NEC – 64M-BIT CMOS MOBILE SPECIFIED RAM 4M-WORD BY 16-BIT EXTENDED TEMPERATURE OPERATION

µPD4664312-X
1. Initialization
Initialize the µPD4664312-X at power application using the following sequence to stabilize internal circuits.
(1) Following power application, make MODE high level after fixing MODE to low level for the period of tVHMH. Make
/CS high level before making MODE high level.
(2) /CS and MODE are fixed to high level for the period of tMHCL.
Normal operation is possible after the completion of initialization.
Figure1-1. Initialization Timing Chart
Initialization
Normal Operation
/CS (Input)
MODE (Input)
tCHMH
tVHMH
tMHCL
VCC
VCC (MIN.)
Cautions 1. Make MODE low level when starting the power supply.
2. tVHMH is specified from when the power supply voltage reaches the prescribed minimum value (VCC
(MIN.)).
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Preliminary Data Sheet M15867EJ5V0DS