AK61584 データシートの表示（PDF） - Asahi Kasei Microdevices

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AK61584

Dual Low Power T1/E1 Line Interface

Asahi Kasei Microdevices 

ASAHI KASEI

[AK61584]

SWITCHING CHARACTERISTICS -SERIAL PORT (TA = -40 to 85oC;

DV+,TV+,RV+ = nominal +/-0.3V; Inputs: Logic 0 = 0V, Logic 1 = RV+)

Parameter

Symbol Min Typ Max Units

SDI to SCLK Setup Time

tdc

25

-

-

ns

SCLK to SDI Hold Time

tcdh

25

-

-

ns

SCLK Low Time

tcl

50

-

-

ns

SCLK High Time

tcl

50

-

-

ns

SCLK Rise and Fall Time

tr,tf

-

-

15

ns

CS to SCLK Setup Time

tcc

20

-

-

ns

SCLK to CS Hold Time

(Note 28)

tcch

20

-

-

ns

CS Inactive Time

tcwh

100

-

-

ns

SCLK to SDO Valid

(Note 29)

tcdv

-

-

50

ns

CS to SDO High Z

tcdz

-

50

-

ns

Notes: 28. If SPOL=0, then CS should return high no sooner than 20ns after the 16‘th falling edge of SCLK

during a serial port read.

29. Output load capacitance = 50 pF.

CS

SCLK

SDI

tcwh

tch

tcc

tcl

tcch

tdc

LSB

tcdh

LSB

MSB

CONTROL BYTE

DATA BYTE

Figure 4. Serial Port Write Timing Diagram

CS

tcdz

SCLK

tcdv

SDO

SPOL=0

Figure 5. Serial Port Read Timing Diagram

High-Z

0185-E-00

-8-

‘98/04

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