455
Address
Data
V
PP
V
CC
CE
PGM
OE
Write
Verify
t
AH
Read data
t
DF
t
DH
t
DS
t
AS
t
VPS
Write data
t
VCS
t
CES
t
PW
(t
OPW
)
*
t
OES
t
OE
V
PP
V
CC
V
CC
+ 1
V
CC
Note:
*
t
OPW
is defined by the value given in the flowchart.
Figure 17.5 Write/Verify Timing
17.3.3
Notes on Writing
1. Always write using the prescribed voltage and timing. The write voltage (programming
voltage) V
PP
is 12.5 V (when the EPROM programmer is set to the Hitachi specifications for
HN27C101, V
PP
is 12.5 V.) Applying a voltage in excess of the rated voltage may damage the
device. Pay particular attention to overshoot in the EPROM programmer.
2. Before programming, always check that the index marks on the EPROM programmer socket,
socket adapter, and device are aligned with each other. If they are not correctly aligned, an
overcurrent may be generated, damaging the device.
3. Do not touch the socket adapter or device during writing. Contact can cause malfunctions that
will prevent data from being written accurately.
Summary of Contents for HD6417032
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Page 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
Page 578: ...543 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 62 Self Refresh ...
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