HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 121

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Figure 6.5 shows a PROM write/verify timing diagram.
6.3.2
112
Note: * t
Address
Data
V
V
CE
OE
Use the specified programming voltage and timing.
The programming voltage in PROM mode (V
permanently damage the chip. Be especially careful with respect to PROM programmer
overshoot.
Setting the PROM programmer to Hitachi specifications for the HN27C256 will result in
correct V
Make sure the index marks on the PROM programmer socket, socket adapter, and chip are
properly aligned. If they are not, the chip may be destroyed by excessive current flow. Before
programming, be sure that the chip is properly mounted in the PROM programmer.
Avoid touching the socket adapter or chip while programming, since this may cause contact
faults and write errors.
PP
CC
Flow Chart.
OPW
V
V
V
V
Programming Precautions
PP
CC
CC
CC
PP
+1
is defined by the value given in figure 6.4, High-Speed, High-Reliability Programming
of 12.5 V.
t
t
t
t
VPS
VCS
DS
AS
Input data
Figure 6.5 PROM Write/Verify Timing
t
OPW
t
PW
*
Write
t
DH
PP
) is 12.5 V. Use of a higher voltage can
t
OES
t
OE
Verify
Output data
t
t
AH
DF