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http://www.union-ic.com Rev.10 May.2016

10/15

UM3202

Pull-up or Pull-down Resistors on I/O Lines

Test Circuits

IN

DUT

OUT

15pF

1M

Ω

Data Rate, Pulse Duration, Propagation Delay,

Output Rise and Fall Time measurement using a

push-pull driver

IN

DUT

OUT

15pF

1M

Ω

Data Rate, Pulse Duration, Propagation Delay,

Output Rise and Fall Time measurement using

an open-drain driver

15pF

50k

Ω

50k

Ω

From Output

Under Test

Open

S1

Load Circuit for Enable/Disable

Time Measurement

TEST

S1

Open

0 V

Input

Voltage Waveforms

Pulse Duration

0 V

Input

Voltage Waveforms Propagation

Delay Times

Output

EN

50%

GND

50%

50%

HIGH

IMPEDANCE

HIGH

IMPEDANCE

10%

90%

Output

Output

Voltage Waveforms Propagation

Disable Times

B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by

the output control.

Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by

the output control.

C. All input pulses are supplied by generators having the following characteristics: PRR≤100MHz,

D. The outputs are measured one at a time, with one transition per measurement.

J. All parameters and waveforms are not applicable to all devices.

Figure 2 Load Circuits and Voltage Waveforms