ST72344S2 datasheet(212/247 Pages) STMICROELECTRONICS

212 / 247 page

Electrical characteristics

ST72344xx, ST2345xx

212/247

Doc ID 12321 Rev 6

13.7

Memory characteristics

TA = –40°C to 85°C, unless otherwise specified.

Table 100.

RAM and hardware registers

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VRM

Data retention mode (1)

Minimum VDD supply voltage without losing data stored in RAM (in Halt mode or under reset) or in

hardware registers (only in Halt mode). Guaranteed by construction, not tested in production.

Halt mode (or reset)

1.6

Table 101.

Flash program memory

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD

Operating voltage for

Flash write/erase

Refer to operating range of

VDD with TA, Table 87

2.7

5.5

tprog

Programming time for

1~32 bytes (1)

Up to 32 bytes can be programmed at a time.

TA=−40 to +85°C

tRET

Data retention (2)

Data based on reliability test results and monitored in production.

TA=+55°C

(3)

The data retention time increases when the TA decreases.

years

NRW

Write erase cycles

TA=+25°C

10,000

(4)

Design target value pending full product characterization.

cycles

IDD

Supply current (5)

Guaranteed by Design. Not tested in production.

Read / Write / Erase modes

fCPU = 8 MHz, VDD = 5.5V

2.6

No Read/No Write Mode

100

µA

Power down mode / Halt

0.1

µA

Table 102.

EEPROM data memory

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD

Operating voltage for

EEPROM write/erase

Refer to operating range of

VDD with TA, Table 87:

General operating conditions

2.7

5.5

tprog

Programming time for

1~32 bytes

TA=−40 to +85°C

tret

Data retention(1)

Data based on reliability test results and monitored in production.

TA=+55°C

(2)

The data retention time increases when the TA decreases.

years

NRW

Write erase cycles

TA=+25°C

300,000

(3)

Design target value pending full product characterization.

cycles

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