protect and sector unprotect features can be en-
abled in a PROM programmer.
The HY29F040A needs a single 5.0 volt power-
supply for read, program and erase operation. In-
ternally generated and well regulated voltages are
provided for program and erase operation. A low
Vcc detector inhibits write operations on loss of
power. End of program or erase is detected by /Data
Polling of DQ7 or by the Toggle Bit feature on DQ6.
Once program or erase cycle is successfully com-
pleted, the device internally resets to the Read
mode.
BLOCK DIAGRAM
DQ 0-DQ7
Vcc
Vss
State
C ontrol
WE
Com mand
R egister
P G M V oltage
G en erato r
Chip E nable
O u tput E nable
Log ic
E rase V oltage
G en erato r
Input/O utpu t
B uffers
CE
OE
STB
Data Latch
STB
Y-D ecoder
V cc D etector
A 0-A18
A ddress
Latch
Y -G ating
Tim e r
Cell M atrix
X-D ecoder
2
HY29F040A
HYNIX [ HYNIX SEMICONDUCTOR ]
