M93C66-WDW6T STMicroelectronics, M93C66-WDW6T Datasheet - Page 12

• Manufacturer Part Number: M93C66-WDW6T
• Manufacturer: STMicroelectronics

Specifications of M93C66-WDW6T

• Density: 4Kb
• Interface Type: Serial (Microwire)
• Organization: 512x8/256x16
• Frequency (max): 2MHz
• Write Protection: No
• Data Retention: 40Year
• Operating Supply Voltage (typ): 3.3/5V
• Package Type: TSSOP
• Operating Temp Range: -40C to 85C
• Supply Current: 2mA
• Operating Supply Voltage (min): 2.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / Rohs Status: Not Compliant

Instructions
5
Table 5.
1. X = Don't Care bit.
12/37
READ
WRITE
WEN
WDS
ERASE
ERAL
WRAL
Instruction
Read Data from
Memory
Write Data to
Memory
Write Enable
Write Disable
Erase Byte or
Word
Erase All Memory
Write All Memory
with same Data
Instructions
The instruction set of the M93Cx6 devices contains seven instructions, as summarized in
Table 5.
●
●
●
●
The M93Cx6 devices are fabricated in CMOS technology and are therefore able to run as
slow as 0 Hz (static input signals) or as fast as the maximum ratings specified in
Table
Instruction set for the M93C46
Description
Each instruction is preceded by a rising edge on Chip Select Input (S) with Serial Clock
(C) being held low.
A start bit, which is the first ‘1’ read on Serial Data Input (D) during the rising edge of
Serial Clock (C).
Two op-code bits, read on Serial Data Input (D) during the rising edge of Serial Clock
(C). (Some instructions also use the first two bits of the address to define the op-code).
The address bits of the byte or word that is to be accessed. For the M93C46, the
address is made up of 6 bits for the x16 organization or 7 bits for the x8 organization
(see
x16 organization or 9 bits for the x8 organization (see
M93C86, the address is made up of 10 bits for the x16 organization or 11 bits for the x8
organization (see
23..
to
Table
Table
5.). For the M93C56 and M93C66, the address is made up of 8 bits for the
7.. Each instruction consists of the following parts, as shown in
Start
bit
1
1
1
1
1
1
1
Table
code
Op-
10
01
00
00
11
00
00
7.).
Address
A6-A0
A6-A0
A6-A0
XXXX
XXXX
XXXX
XXXX
x8 origination (ORG = 0)
11X
00X
10X
01X
(1)
Q7-Q0
D7-D0
D7-D0
M93C86, M93C76, M93C66, M93C56, M93C46
Data
Required
cycles
clock
18
10
10
10
10
18
Table
11 XXXX
00 XXXX
10 XXXX
01 XXXX D15-D0
Address
A5-A0
A5-A0
A5-A0
x16 origination (ORG = 1)
6.). For the M93C76 and
(1)
Q15-Q0
D15-D0
Data
Table 20.
Figure
Required
cycles
clock
25
25
9
9
9
9
4.:
to