Symbol

Parameter

Value

Unit

Ambient Operating Temperature

(2)

–40 to 125

°C

Storage Temperature

–65 to 150

°C

Lead Temperature, Soldering

(SO8 package)

40 sec

215

°C

Output Voltage

V

Input Voltage with respect to Ground

–0.3 to 6.5

V

Supply Voltage

–0.3 to 6.5

V

Electrostatic Discharge Voltage (Human Body model)

(3)

4000

V

Electrostatic Discharge Voltage (Machine model)

(4)

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 STMicroelectronics SURE Program and

other relevant quality documents.

2. Depends on range.

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

Ω)

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

Ω)

The device connected to the bus is selected when

the chip select input (S) goes low. Communications

with the chip can be interrupted with a hold input

(HOLD). The write operation is disabled by a write

protect input (W).

Data is clocked in during the low to high transition

of clock C, data is clocked out during the high to

low transition of clock C.

SIGNALS DESCRIPTION

Serial Output (Q). The output pin is used to trans-

fer data serially out of the ST95022. Data is shifted

out on the falling edge of the serial clock.

Serial Input (D). The input pin is used to transfer

data serially into the device. It receives instructions,

addresses, and the data to be written. Input is

latched on the rising edge of the serial clock.

Serial Clock (C). The serial clock provides the

timing of the serial interface. Instructions, ad-

dresses, or data present at the input pin are latched

on the rising edge of the clock input, while data on

the Q pin changes after the falling edge of the clock

input.

Chip Select (S). When S is high, the ST95022 is

deselected and the D output pin is at high imped-

ance and, unless an internal write operation is

underway the ST95022 will be in the standby power

mode. S low enables the ST95022, placing it in the

active power mode. It should be noted that after

power-on, a high to low transition on S is required

prior to the start of any operation.

Write Protect (W). This pin is for hardware write

protection. When W is low, writes to the ST95022

memory are disabled but any other operations stay

enabled. When W is high, all writes operations are

available. W going low at any time before the last

bit D0 of the data stream will reset the write enable

latch and prevent programming. No action on W or

on the write enable latch can interrupt a write cycle

which has commenced.

1

AI01723

2

3

4

8

7

6

5

D

VSS

C

HOLD

Q

SVCC

W

ST95022

Figure 2B. SO Pin Connections

DESCRIPTION (cont’d)

2/16

ST95022