HN58V256AT-12 HITACHI [Hitachi Semiconductor], HN58V256AT-12 Datasheet - Page 14

• Manufacturer Part Number: HN58V256AT-12
• Description: 256k EEPROM (32-kword x 8-bit) Ready/Busy and RES function (HN58V257A)
• Manufacturer: HITACHI [Hitachi Semiconductor]

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”.
14
Address
I/O6
WE
OE
CE
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.
Din
t
OEH
t
t
CE
OE
*3
*3
Dout
*1
Dout
t
WC
Dout
*2
Dout
*2
t
DW
*4
t
OES
Next mode