9

DS734F5

4.4 Application Code Security

4.3.3

Pads

The CS485xx I/Os operate from the 3.3 V supply and are 5 V tolerant.

4.4 Application Code Security

The external program code may be encrypted by the programmer to protect any intellectual property it may contain. A

secret, customer-specific key is used to encrypt the program code that is to be stored external to the device. Contact your

local Cirrus representative for details.

5 Characteristics and Specifications

Note:

All data sheet minimum and maximum timing parameters are guaranteed over the rated voltage and temperature.

VDD = VDDA = 1.8 V, VDDIO = 3.3 V, GNDD = GNDIO = GNDA = 0 V.

5.1 Absolute Maximum Ratings

(GNDD = GNDIO = GNDA = 0 V; all voltages with respect to 0 V)

WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not

guaranteed at these extremes.

5.2 Recommended Operations Conditions

(GNDD = GNDIO = GNDA = 0 V; all voltages with respect to 0 V)

Note:

It is recommended that the 3.3 V IO supply come up ahead of or simultaneously with the 1.8 V core supply.

5.3 Digital DC Characteristics

(Measurements performed under static conditions.)

Parameter

Symbol

Min

Max

Unit

DC power supplies:

Core supply

VDD

–0.3

2.0

V

PLL supply

VDDA

–0.3

3.6

V

I/O supply

VDDIO

–0.3

3.6

V

|VDDA–VDDIO|

—

—

0.3

V

Input pin current, any pin except supplies

—±10

mA

Input voltage on PLL_REF_RES

–0.3

3.6

V

Input voltage on I/O pins

–0.3

5.0

V

Storage temperature

–65

150

°C

Parameter

Symbol

Min

Typ

Max

Unit

DC power supplies:

Core supply

VDD

1.71

1.8

1.89

V

PLL supply

VDDA

3.13

3.3

3.46

V

I/O supply

VDDIO

3.13

3.3

3.46

V

|VDDA–VDDIO|

—

—

0

—

V

Ambient operating temperature

——

—

°C

–CQZ

—

0

—

+70

—

–DQZ

—

–40

—

+85

—