HN58C256AP85E Renesas Electronics America, HN58C256AP85E Datasheet - Page 20

• Manufacturer Part Number: HN58C256AP85E
• Description: IC, EEPROM, 256KBIT, 1MHZ, DIP-28
• Manufacturer: Renesas Electronics America

Specifications of HN58C256AP85E

• Memory Size: 256Kbit
• Memory Configuration: 32K X 8
• Ic Interface Type: Parallel
• Access Time: 85ns
• Supply Voltage Range: 4.5V To 5.5V
• Memory Case Style: DIP
• No. Of Pins: 28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

HN58C256A Series, HN58C257A Series
3. Software data protection
Note: There are some differences between Renesas Technology’s and other company’s for enable/disable
Rev.6.00, Oct. 26.2006, page 20 of 24
To prevent unintentional programming, this device has the software data protection (SDP) mode. The
SDP is enabled by inputting the following 3 bytes code and write data. SDP is not enabled if only the 3
bytes code is input. To program data in the SDP enable mode, 3 bytes code must be input before write
data.
The SDP mode is disabled by inputting the following 6 bytes code. Note that, if data is input in the SDP
disable cycle, data can not be written.
The software data protection is not enabled at the shipment.
sequence of software data protection. If there are any questions , please contact with Renesas
Technology’s sales offices.
Write address
Address
2AAA
5555
5555
↓
↓
↓
Address
2AAA
2AAA
5555
5555
5555
5555
↓
↓
↓
↓
↓
Write data }
Data
AA
A0
55
↓
↓
↓
Normal data input
Data
AA
AA
55
80
55
20
↓
↓
↓
↓
↓