AMBE2000 datasheet(37/47 Pages) ETC

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AMBE-2000™ Vocoder Chip

User’s Manual Version 3.0

page 37

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Confidential Proprietary, Subject to Change

Table 6-E Switching Characteristics Over Recommended Operating Conditions

for Serial Port Receive

3.3 Volts

Reference

Parameter

Min

Max

Units

td(SCK)

Delay time, DX valid after CLKX rising

tc(SCK)

Cycle time, serial port clock

tf(SCK)

Fall time, serial port clock

tr(SCK)

Rise time, serial port clock

tw(SCK)

Pulse duration, serial port clock low/ high

tsu(FSR)

Setup time, FSR before CLKR falling edge

tsu(DR)

Setup time, DR before CLKR falling edge

td(FSX)

Delay time, CLKX rising to FSX

th(FSX)

Hold time, FSX after CLKX falling edge

th(FSX)H

Hold time, FSX after CLKX rising edge

2H-5

tdis(DX)

Disable time, CLKX rising to DX

th(DX)

Hold time, DX valid after CLKX rising

edge

-5

•

Note: H = 7.629 ns; however, do not operate serial clocks any faster than 2.048 MHz. Thus tc(SCK) should be a

minimum of 488.3 nsec.

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