HN58V256A Datasheet, PDF (14/25 Pages) Hitachi Semiconductor – 256k EEPROM (32-kword x 8-bit) Ready/Busy and RES function (HN58V257A)

HN58V256A Series, HN58V257A Series
Toggle bit
This device provide another function to determine the internal programming cycle. If the EEPROM is set to
read mode during the internal programming cycle, I/O6 will charge from “1” to “0” (toggling) for each read.
When the internal programming cycle is finished, toggling of I/O6 will stop and the device can be accessible
for next read or program.
Toggle bit Waveform
Notes: 1. I/O6 beginning state is “1”.
2. I/O6 ending state will vary.
3. See AC read characteristics.
4. Any address location can be used, but the address must be fixed.
Address
CE
t_CE ^*3
Next mode
*4
WE
t_OE^*3
OE
t_OEH
*1
I/O6
Din
Dout
Dout
t_WC
*2
Dout
t_OES
*2
Dout
t_DW
Rev.5.00, Nov. 17.2003, page 14 of 22