CS89712 datasheet(149/170 Pages) CIRRUS

149 / 170 page

CS89712

DS502PP2

149

DC CHARACTERISTICS (

Notes: 4. Power dissipation values can be derived by multiplying the IDD current by 2.5 V Core/OSC or 3.3V I/O.

5. The RTC of the CS89712 should be brought up at room temperature. The RTC OSC will NOT function

properly if it is brought up at –40

°C. Once operational, it will continue to operate down to –40°C.

6. A typical design will provide 3.3 V to the I/O supply (i.e., VDDIO), and 2.5 V to the remaining logic. This

is to allow the I/O to be compatible with 3.3 V powered external logic (i.e., 3.3 V SDRAMs).

7. Pull-up current = 50 µA typical at VDD = 3.3 volts.

Parameter

Symbol

Min

Typ

Max

Unit

Conditions

Operating current consumption (74 MHz)

Core/Osc/RTC @2.5 V, I/O @ 3.3 V

Ethernet active

IDDoperat-

ing

TBD

All system active,

running typical pro-

gram, cache dis-

abled, LCD inactive

Operating power consumption (74 MHz)

270

TBD

see above

Ethernet XTAL1 Input Low Voltage

VIXH

-0.2

Ethernet XTAL1 Input High Voltage

VIXH

-1.5

XTAL1 Input Low Current

IIXL

--40

µA

XTAL1 Input High Current

IIXH

-40

µA

Ethernet Port Power Supply Current while

Active 3.3V

IDD

-65

Ethernet Port Software Suspend Mode Cur-

rent

IDDSWSUS

-1.0

10 BaseT Transmitter Differential Output

Voltage (Peak)

VOD

2.2

2.8

Secondary side of

Transformer

Receiver Normal Squelch Level (Peak)

VISQ

300

525

Primary side of

Transformer

Receiver Low Squelch Level (LoRxSquelch

bit set)

VSQL

125

290

Primary side of

Transformer

Standby supply voltage

VDDstandby TBD

Minimum standby

voltage for state

retention and RTC

operation only

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