SDA

VSS

SCL

VCLK

NC

NC

VCC

NC

AI01499

ST24LC21

1

2

3

4

8

7

6

5

Figure 2A. DIP Pin Connections

1

AI01500

2

3

4

8

7

6

5

SDA

VSS

SCL

VCLK

NC

NC

VCC

NC

ST24LC21

Figure 2B. SO Pin Connections

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

grade 1

0 to 70

°C

Storage Temperature

–65 to 150

°C

Lead Temperature, Soldering

(SO8 package)

(PSDIP8 package)

40 sec

10 sec

215

260

°C

Input or Output Voltages

–0.3 to 6.5

V

Supply Voltage

–0.3 to 6.5

V

Electrostatic Discharge Voltage (Human Body model)

(2)

4000

V

Electrostatic Discharge Voltage (Machine model)

(3)

500

V

Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings"

may cause permanent 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 implied. Exposure to Absolute Maximum

Rating conditions for extended periods may affect device reliability. Refer also to the SGS-THOMSON SURE Program and other

relevant quality documents.

2. MIL-STD-883C, 3015.7 (100pF, 1500

Ω).

3. EIAJ IC-121 (Condition C) (200pF, 0

Ω).

Device Code

Chip Enable

RW

Bit

b7

b6

b5

b4

b3

b2

b1

b0

Device Select

1

0

1

0

X

X

X

RW

Note: The MSB b7 is sent first.

X = 0 or 1.

Table 3. Device Select Code

Warning: NC = Not Connected

Warning: NC = Not Connected

2/18

ST24LC21