ST93C47TM3013TR datasheet(9/13 Pages) STMICROELECTRONICS

tên linh kiện	ST93C47TM3013TR

Giải thích chi tiết về linh kiện	1K 64 x 16 or 128 x 8 SERIAL MICROWIRE EEPROM

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READY/BUSY Status

During every programming cycle (after a WRITE,

ERASE, WRAL or ERAL instruction) the Data Out-

put (Q) indicates the Ready/Busy status of the

memory when the Chip Select is driven High. Once

the ST93C46 is Ready, the Data Output is set to ’1’

until a new start bit is decoded or the Chip Select

is brought Low.

COMMON I/O OPERATION

The Data Output (Q) and Data Input (D) signals can

be connected together, through a current limiting

resistor, to form a common, one wire data bus.

Some precautions must be taken when operating

the memory with this connection, mostly to prevent

a short circuit between the last entered address bit

(A0) and the first data bit output by Q. The reader

should refer to the SGS-THOMSON application

note ”MICROWIRE EEPROM Common I/O Opera-

tion”.

DIFFERENCES BETWEEN ST93C46A AND

ST93C46C

The ST93C46C is an enhanced version of the

ST93C46A and offers the following extra features:

– Enhanced ESD voltage

– Functional security filtering glitches on the

clock input (C).

Refer to Table 2 (Absolute Maximum Ratings) for

more about ESD limits. The following description

will detail the Clock pulses counter (available only

on the ST93C46C).

In a normal environment, the ST93C46 is expected

to receive the exact amount of data on the D input,

that is the exact amount of clock pulses on the C

input.

In a noisy environment, the amount of pulses re-

ceived (on the clock input C) may be greater than

the clock pulsesdelivered by the Master (Microcon-

troller) driving the ST93C46C. In such a case, a

part of the instruction is delayed by one bit (see

Figure 9), and it may induce an erroneous write of

data at a wrong address.

The ST93C46C has an on-board counter which

counts the clock pulses from the Start bit until the

falling edge of the Chip Select signal. For the

WRITE instructions, the number of clock pulses

incoming to the counter must be exactly 18 (with

the Organisation by 8) from the Start bit to the

falling edge of Chip Select signal (1 Start bit + 2 bits

of Op-code + 7 bits of Address + 8 bits of Data =

18): if so, the ST93C46C executes the WRITE

instruction; if the number of clock pulses is not

equal to 18, the instruction will not be executed

(and data will not be corrupted).

In the same way, when the Organisation by 16 is

selected, the number of clock pulses incoming to

the counter must be exactly 25 (1 Start bit + 2 bits

of Op-code + 6 bits of Address + 16 bits of Data =

25) from the Start bit to the falling edge of Chip

Select signal: if so, the ST93C46C executes the

WRITE instruction; if the number of clock pulses is

not equal to 25, the instruction will not be executed

(and data will not be corrupted). The clock pulse

counter is active only on ERASE and WRITE in-

structions (WRITE, ERASE, ERAL, WRALL).

AI00880C

S

WRITE

ALL

DATA IN

D

Q

ADDR

OP

CODE

Dn

D0

BUSY

READY

CHECK

STATUS

10 0

0

1 Xn X0

Figure 8. WRAL Sequence

Note: 1. Xn: n = 3 for x16 org. and 4 for x8 org.

9/13

ST93C46A/46C/46T, ST93C47C/47T

Số phần tương tự - ST93C47TM3013TR

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	ST93C06	118Kb / 15P	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM
	ST93C06B1013TR	118Kb / 15P	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM
	ST93C06B3013TR	118Kb / 15P	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM
	ST93C06B6013TR	118Kb / 15P	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM
	ST93C06C	118Kb / 15P	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM

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nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	ST93CS46	124Kb / 16P	1K 64 x 16 SERIAL MICROWIRE EEPROM
ATMEL Corporation	AT93C46D	512Kb / 21P	Three-wire Serial EEPROM 1K (128 x 8 or 64 x 16)
STMicroelectronics	ST93C56	108Kb / 13P	2K 128 x 16 or 256 x 8 SERIAL MICROWIRE EEPROM
Microchip Technology	ER5911	421Kb / 8P	1K (128 X 8 OR 64 X 16) SERIAL ELECTRICALLY ERASABLE PROM 1989
STMicroelectronics	ST24	146Kb / 16P	SERIAL 1K 128 x 8 EEPROM November 1997
	ST93CS56	124Kb / 16P	2K 128 x 16 SERIAL MICROWIRE EEPROM
	ST93C06	118Kb / 15P	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM
	ST93C66	107Kb / 13P	4K 256 x 16 or 512 x 8 SERIAL MICROWIRE EEPROM
ATMEL Corporation	AT24C01B	634Kb / 25P	Two-wire Serial EEPROM 1K (128 x 8)
ATMEL Corporation	AT93C46A	143Kb / 15P	3-Wire Serial EEPROM 1K (64 x 16)

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