M34C02-LDW1G Просмотр технического описания (PDF) - STMicroelectronics

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M34C02-LDW1G

2 Kbit Serial I²C Bus EEPROM for DIMM serial presence detect

STMicroelectronics 

M34C02-W, M34C02-L, M34C02-R

Signal description

2.5

2.5.1

2.5.2

2.5.3

Supply voltage (VCC)

Operating supply voltage VCC

Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage

within the specified [VCC(min), VCC(max)] range must be applied (see Table 6, Table 7 and

Table 8). In order to secure a stable DC supply voltage, it is recommended to decouple the

VCC line with a suitable capacitor (usually of the order of 10nF to 100nF) close to the

VCC/VSS package pins.

This voltage must remain stable and valid until the end of the transmission of the instruction

and, for a Write instruction, until the completion of the internal write cycle (tW).

Internal device reset

In order to prevent inadvertent Write operations during Power-up, a Power On Reset (POR)

circuit is included. At Power-up (continuous rise of VCC), the device will not respond to any

instruction until VCC has reached the Power On Reset threshold voltage (this threshold is

lower than the minimum VCC operating voltage defined in Table 6, Table 7 and Table 8).

When VCC has passed the POR threshold, the device is reset and in the Standby Power

mode.

Power-down

At Power-down (where VCC decreases continuously), as soon as VCC drops from the normal

operating voltage to below the Power On Reset threshold voltage, the device stops

responding to any instruction sent to it.

During Power-down, the device must be deselected and in Standby Power mode (that is

there should be no internal Write cycle in progress).

Figure 4.

20

Maximum RP value versus bus parasitic capacitance (C) for an I²C Bus

VCC

16

12

8

4

0

10

fc = 100kHz

fc = 400kHz

100

C (pF)

RP

RP

SDA

MASTER

C

SCL

1000

C

AI01665b

9/31

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