UPD178P018 Datasheet, PDF (44/60 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD178P018
PROM Write Mode Timing (byte program mode)
Program
Program Verify
A0 to A16
tAS
Hi-Z
D0 to D7
VPP
VPP
VDD
tDS
tVPS
VDD + 1.5
VDD
VDD
tVDS
VIH
CE
VIL
tCES
VIH
PGM
VIL
VIH
OE
VIL
Data Input
tDH
tDF
Hi-Z
Data Output
Hi-Z
tAH
tPW
tOES
tOE
tOEH
Cautions 1. VDD should be applied before VPP, and removed after VPP.
2. VPP must not exceed +13.5 V including overshoot.
3. Reliability may be adversely affected if removal/reinsertion is performed while + 12.5 V is being
applied to VPP.
PROM Read Mode Timing
A0 to A16
Effective Address
VIH
CE
VIL
VIH
OE
VIL
D0 to D7
tCE
tACC^Note1
Hi-Z
tOE^{Note 1}
tOH
Data Output
tDF^{Note 2}
Hi-Z
Notes 1. If you want to read within the range of tACC, make the OE input delay time from the fall of CE a maximum
of tACC – tOE.
2. tDF is the time from when either OE or CE first reaches VIH.
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