M93C46-RDS6G Datasheet M93C46-RDS6G, M93C46-RDS6TG, M93C56-RDS6G | P10-P12

M93C86, M93C76, M93C66, M93C56, M93C46, M93C06

10/30

Figure 7. WRAL Sequence

Note: For the meanings of Xn and Dn, please see Table 4, Table 5 and Table 6.

Write All

As with the Erase All Memory (ERAL) instruction,

the format of the Write All Memory with same Data

(WRAL) instruction requires that a dummy ad-

dress be provided. As with the Write Data to Mem-

ory (WRITE) instruction, the format of the Write All

Memory with same Data (WRAL) instruction re-

quires that an 8-bit data byte, or 16-bit data word,

be provided. This value is written to all the ad-

dresses of the memory device. The completion of

the cycle can be detected by monitoring the

Ready/Busy

line, as described next.

READY/BUSY

STATUS

While the Write or Erase cycle is underway, for a

WRITE, ERASE, WRAL or ERAL instruction, the

Busy signal (Q=0) is returned whenever Chip Se-

lect Input (S) is driven High. (Please note, though,

that there is an initial delay, of t

SLSH

, before this

status information becomes available). In this

state, the M93Cx6 ignores any data on the bus.

When the Write cycle is completed, and Chip Se-

lect Input (S) is driven High, the Ready signal

(Q=1) indicates that the M93Cx6 is ready to re-

ceive the next instruction. Serial Data Output (Q)

remains set to 1 until the Chip Select Input (S) is

brought Low or until a new start bit is decoded.

COMMON I/O OPERATION

Serial Data Output (Q) and Serial Data Input (D)

can be connected together, through a current lim-

iting resistor, to form a common, single-wire data

bus. Some precautions must be taken when oper-

ating the memory in this way, mostly to prevent a

short circuit current from flowing when the last ad-

dress bit (A0) clashes with the first data bit on Se-

rial Data Output (Q). Please see the application

note

AN394

for details.

AI00880C

SWRITE

ALL

DATA IN

ADDR

CODE

Dn D0

BUSY READY

CHECK

STATUS

0 00 1 Xn X0

11/30

M93C86, M93C76, M93C66, M93C56, M93C46, M93C06

Figure 8. Write Sequence with One Clock Glitch

CLOCK PULSE COUNTER

In a noisy environment, the number of pulses re-

ceived on Serial Clock (C) may be greater than the

number delivered by the master (the microcontrol-

ler). This can lead to a misalignment of the instruc-

tion of one or more bits (as shown in Figure 8) and

may lead to the writing of erroneous data at an er-

roneous address.

To combat this problem, the M93Cx6 has an on-

chip counter that counts the clock pulses from the

start bit until the falling edge of the Chip Select In-

put (S). If the number of clock pulses received is

not the number expected, the WRITE, ERASE,

ERAL or WRAL instruction is aborted, and the

contents of the memory are not modified.

The number of clock cycles expected for each in-

struction, and for each member of the M93Cx6

family, are summarized in Table 4 to Table 6. For

example, a Write Data to Memory (WRITE) in-

struction on the M93C56 (or M93C66) expects 20

clock cycles (for the x8 organization) from the start

bit to the falling edge of Chip Select Input (S). That

is:

1 Start bit

+ 2 Op-code bits

+ 9 Address bits

+ 8 Data bits

AI01395

An-1

WRITE

START

D0"1""0"

Glitch

An-2

ADDRESS AND DATA

ARE SHIFTED BY ONE BIT

M93C86, M93C76, M93C66, M93C56, M93C46, M93C06

12/30

MAXIMUM RATING

Stressing the device above the rating listed in the

Absolute Maximum Ratings" table may cause per-

manent damage to the device. These are stress

ratings only and operation of the device at these or

any other conditions above those indicated in the

Operating sections of this specification is not im-

plied. Exposure to Absolute Maximum Rating con-

ditions for extended periods may affect device

reliability. Refer also to the STMicroelectronics

SURE Program and other relevant quality docu-

ments.

Table 7. Absolute Maximum Ratings

Note: 1. Compliant with the ECOPACK

7191395 specifiication for lead-free soldering processes

2. No longer than 10 seconds

3. Not exceeding 250°C for more than 30 seconds, and peaking at 260°C

4. JEDEC Std JESD22-A114A (C1=100 pF, R1=1500

Ω

, R2=500

Ω

)

Symbol Parameter Min. Max. Unit

STG

Storage Temperature –65 150 °C

LEAD

Lead Temperature during Soldering

PDIP

TSSOP

260

°C

OUT

Output range (Q = V

or Hi-Z)

–0.45 V

+0.5 V

Input range –0.45 V

+1 V

Supply Voltage –0.3 6.5 V

ESD Electrostatic Discharge Voltage (Human Body model)

–4000 4000 V

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30

M93C46-RDS6G

Mfr. #:

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Manufacturer:

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Description:

EEPROM 1K (64x8 or 32x16)

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M93C46-RDS6G

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