AM1806 datasheet(64/241 Pages) TI

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TransmissionLine

4.0pF

1.85pF

Z0=50 Ω

(seenote)

Tester PinElectronics

Data SheetTimingReferencePoint

Output

Under

Test

42 Ω

3.5nH

DevicePin

(seenote)

Vref

AM1806

SPRS658B – FEBRUARY 2010 – REVISED MAY 2010

www.ti.com

Peripheral Information and Electrical Specifications

6.1

Parameter Information

6.1.1

Parameter Information Device-Specific Information

The data sheet provides timing at the device pin. For output timing analysis, the tester pin electronics and its

transmission line effects must be taken into account. A transmission line with a delay of 2 ns or longer can be used to

produce the desired transmission line effect. The transmission line is intended as a load only. It is not necessary to

add or subtract the transmission line delay (2 ns or longer) from the data sheet timings.

Input requirements in this data sheet are tested with an input slew rate of < 4 Volts per nanosecond (4 V/ns) at the

device pin and the input signals are driven between 0V and the appropriate IO supply rail for the signal.

Figure 6-1. Test Load Circuit for AC Timing Measurements

The load capacitance value stated is only for characterization and measurement of AC timing signals. This

load capacitance value does not indicate the maximum load the device is capable of driving.

6.1.1.1

Signal Transition Levels

All input and output timing parameters are referenced to Vref for both "0" and "1" logic levels. For 3.3 V I/O,

Vref = 1.65 V. For 1.8 V I/O, Vref = 0.9 V.

Figure 6-2. Input and Output Voltage Reference Levels for AC Timing Measurements

All rise and fall transition timing parameters are referenced to VIL MAX and VIH MIN for input clocks,

VOLMAX and VOH MIN for output clocks

Figure 6-3. Rise and Fall Transition Time Voltage Reference Levels

Peripheral Information and Electrical Specifications

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