HD74HC240
Test Circuit
VCC
VCC
Output
1G, 2G
1Y1 to 2Y4
1A1 to 2A4
1 kΩ
Input
OPEN
GND
VCC
S1
Pulse Generator
Zout
CL =
50 pF
Ω
= 50
TEST
S1
tPLH/ tPHL
tZH/ tHZ
tZL / tLZ
OPEN
GND
VCC
Note : 1. CL includes probe and jig capacitance.
Waveforms
•
Waveform – 1
tf
tr
VCC
0 V
90 %
50 %
90 %
50 %
Input A
10 %
tPLH
10 %
tPHL
VOH
90 %
90 %
Output Y
50 %
10 %
50 %
10 %
VOL
tTLH
tTHL
•
Waveform – 2
Input G
tf
tr
VCC
0 V
90 %
90 %
50 %
50 %
10 %
10 %
tZL
tLZ
VOH
VOL
VOH
VOL
50 %
Waveform – A
Waveform – B
10 %
90 %
tZH
tHZ
50 %
Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, tr ≤ 6 ns, tf ≤ 6 ns
2. Waveform– A is for an output with internal conditions such that the
output is low except when disabled by the output control.
3. Waveform– B is for an output with internal conditions such that the
output is high except when disabled by the output control.
4. The output are measured one at a time with one transition per measurement.
Rev.2.00 Jan 31, 2006 page 5 of 7
RENESAS [ RENESAS TECHNOLOGY CORP ]
