S-93C66BR0I-J8T1G Seiko Instruments, S-93C66BR0I-J8T1G Datasheet - Page 18

• Manufacturer Part Number: S-93C66BR0I-J8T1G
• Description: IC EEPROM 4KBIT 500KHZ 8SOP
• Manufacturer: Seiko Instruments

Specifications of S-93C66BR0I-J8T1G

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (256 x 16)
• Speed: 500kHz
• Interface: 3-Wire Serial
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18
3-WIRE SERIAL E
S-93C46B/56B/66B
5. Write enable (EWEN) and write disable (EWDS)
The EWEN instruction is an instruction that enables a write operation. The status in which a write operation is
enabled is called the program enable mode.
The EWDS instruction is an instruction that disables a write operation. The status in which a write operation is
disabled is called the program disable mode.
After CS goes high, input an instruction in the order of the start bit, EWEN or EWDS instruction, and address
(optional). Each mode becomes valid by inputting a low level to CS after the last address (optional) has been
input.
(1) Recommendation for write operation disable instruction
CS
SK
DI
It is recommended to implement a design that prevents an incorrect write operation when a write instruction
is erroneously recognized by executing the write operation disable instruction when executing instructions
other than write instruction, and immediately after power-on and before power off.
CS
SK
DI
2
PROM
1
Figure 20 Write Enable/Disable Timing (S-93C56B, S-93C66B)
0
1
2
Figure 19 Write Enable/Disable Timing (S-93C46B)
0
0
2
3
11 = EWEN
00 = EWDS
0
Seiko Instruments Inc.
3
4
11 = EWEN
00 = EWDS
4
5
6
5
6
7
6Xs
7
8
4Xs
9
8
10
9
11
Standby
Standby
Rev.7.0
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