s-93c46a Seiko Instruments Inc., s-93c46a Datasheet - Page 40

• Manufacturer Part Number: s-93c46a
• Description: Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Collection of Product FAQs
Author: Kano Tomoo
<Information level>
<Product>
Related documents:
Question:
Answer:
B:
Index:
Division name: 01 IC
Category 1:
Category 2:
Cal. No.:
False-writes in S-93C, S-29 series: inadvertent activation of CS (malfunction)
Inadvertent writing in the S-29 series
In the S-29 series, when a CS input is inadvertently activated during a write command, undefined data
may be written. Relevant timings are shown below.
A command is composed of the following: “start bit + two command bits + address + (data).”
The figure below shows the timings in which commands are set (In the figure, the portion denotes the
rising edge of SK.)
In the case of a write command, after a final address has been input and while 16-bit data is being input,
undefined data is written when the CS input is changed from H to L.
[WRITE]
CS
SK
DI
DO
Case in which, during a command entry, CS is changed from H to L with a timing that differs by a
predetermined minimum number of clocks.
1
1
0
2
For Distri & Rep (Printing N.G.)
B: Technical
12 Memory
2. Serial EEPROM
Overall
1
3
A5
Hi-Z
4
A4
5
Date: 98/11/12 (Thursday) 10:17 (modified: 99/01/13)
A3
6
A2
7
A1
8
Activation of SK obtaining A
A0
9
39
D15
10
25
D0
t
t
CDS
SV
t
PR
VERIFY
busy
ready
Hi-Z
t
HZ1