CS4953xx Data Sheet

32-bit Audio Decoder DSP Family

DS705F2

9

4.3.2 Termination Requirements

Open-drain pins on the CS4953xx must be pulled high for proper operation. Refer to the CS4953xx Hardware

User’s Manual to identify which pins are open-drain and what value of pull-up resistor is required for proper

operation.

Mode select pins on the CS4953xx are used to select the boot mode upon the rising edge of reset. A detailed

explanation of termination requirements for each communication mode select pin can be found in the

CS4953xx Hardware User’s Manual.

4.3.3 Pads

The CS4953xx I/O operates from the 3.3 V supply and is 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.

5 Characteristics and Specifications

Note: All data sheet minimum and maximum timing parameters are guaranteed over the rated voltage and

temperature. All data sheet typical parameters are measured under the following conditions: T = 25 °C,

5.1 Absolute Maximum Ratings

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

CAUTION: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is

not guaranteed at these extremes.

Parameter

Symbol

Min

Max

Unit

DC power supplies:

Core supply

PLL supply

I/O supply

|VDDA – VDDIO|

VDD

VDDA

VDDIO

–0.3

–0.3

–0.3

-

2.0

3.6

3.6

0.3

V

V

V

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