AT21CS01 datasheet(8/47 Pages) MICROCHIP

8 / 47 page

VIH, VIL, and VHYS are a function of the internal supply voltage, which is a function of VPUP, RPUP,

CBUS, and timing used. Use of a lower VPUP, higher RPUP, higher CBUS, and shorter tRCV creates

lower VIH, VIL and VHYS values.

Once VIH is crossed on a rising edge of SI/O, the voltage on SI/O must drop at least by VHYS to be

detected as a logic ‘0’.

1.5

AT21CS01/11 AC Characteristics

1.5.1

Reset and Discovery Response Timing

Parameter and Condition(1)(2)

Symbol

Standard

Speed(3)(4)

High Speed

Units

Min.

Max.

Min.

Max.

Reset Low Time, Device in Inactive

State

tRESET

480

—

µs

Discharge Low Time, Device in Active

Write Cycle (tWR)

tDSCHG

150

—

150

—

µs

Reset Recovery Time

tRRT

N/A

—

µs

Discovery Response Request

tDRR

N/A

2 - tPUP(5)

µs

Discovery Response Acknowledge

Time

tDACK

N/A

µs

Master Strobe Discovery Response

Time

tMSDR

N/A

µs

SI/O High Time for Start/Stop

Condition

tHTSS

N/A

150

—

µs

Note:

Parameters applicable over operating range in AT21CS01/11 DC and AC Operating Range, unless

otherwise noted.

AC measurement conditions for the table above:

–

Loading capacitance on SI/O: 100 pF

–

RPUP (bus line pull-up resistor to VPUP): 1 kΩ; VPUP: 2.7V

Due to the fact that the device will default to High-Speed mode upon Reset, the Reset and

Discovery Response Timing after tRESET does not apply for Standard Speed mode. High-Speed

mode timing applies in all cases after tRESET.

Standard Speed is not available on the AT21CS11.

tPUP is the time required once the SI/O line is released to be pulled up from VIL to VIH. This value is

application specific and is a function of the loading capacitance on the SI/O line as well as the RPUP

chosen. Limits for these values are provided in AT21CS01 DC Characteristics(1) and AT21CS11

DC Characteristics(1).

AT21CS01/AT21CS11

Datasheet

DS20005857A-page 8

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