MA28151

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5. AC ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Min.

Max.

Units

Condition

Internal clock cycle time

200

1000

nS

Notes 1, 5, 6

External Clock high pulse width

25

-

nS

-

External Clock low pulse width

25

-

nS

-

Clock rise and fall time

-

10

nS

-

TxD delay from falling edge of TxD

-

1

µS-

Transmitter input clock pulse width

-

-

1 x baud rate

-

-

16 x and 64 x baud rate

Transmitter input clock pulse delay

-

-

1 x baud rate

-

-

16 x and 64 x baud rate

Receive input clock pulse width

-

-

1 x baud rate

-

-

16 x and 64 x baud rate

Receive input clock pulse delay

-

-

1 x baud rate

-

-

16 x and 64 x baud rate

TxRDY pin delay from CENTER of last bit

-

-

Note 7

TxRDY fall from falling DSN (WRITE)

-

45

-

Note 7

RxRDY pin delay from center of last bit

-

-

Note 7

RxRDY fall from falling DSN (READ)

-

45

-

Note 7

TxEMPTY from centre of last bit

-

-

Note 7

Control delay from rising edge of WRITE

-

-

Note 7

Control to READ set-up time (

DSR, CTS)

-

-

Note 7

Address stable before DSN (CSN, CDN)

0

-

ns

Note 2

Address hold time before DSN (CSN, CDN)

0

-

ns

Note 2

DSN pulse width

20

-

ns

-

Data delay from DSN falling (READ)

-

30

ns

Note 3

DSN rising to data floating (READ)

10

45

ns

Note 8

Data set-up time to DSN rising (WRITE)

15

-

ns

-

Data hold time to DSN rising (WRITE)

5

-

ns

-

Recovery time between writes (not shown)

-

-

Note 4

2. CSN and Command/Data are considered as addresses.

3. Assumes that address is valid before DSN goes low.

4. This recovery time is for Mode Initialisation only. Write data is allowed when TxRDY = 1. Recovery time between

5. The

7. Status update can have a maximum delay of 28 clock periods from the event affecting the status.

Mil-Std-883, method 5005, subgroups 9, 10, 11

Figure 23: AC Electrical Characteristics

Symbol

Parameter

Min.

Max.

Units

Condition

-

Clock Frequency (osc)

-

20

MHz

-

Transmitter input clock frequency

DC

64

kHz

1 x baud rate

DC

310

kHz

16 x baud rate

DC

615

kHz

64 x baud rate

Receiver input clock frequency

DC

64

kHz

1x baud rate

DC

310

kHz

16 x baud rate

DC

615

kHz

64 x baud rate

Mil-Std-883, method 5005, subgroups 7, 8A, 8B

Figure 24: Operating AC Electrical Characteristics