HD74HC670 Datasheet, PDF (7/9 Pages) Hitachi Semiconductor – 4-by-4 Register File (with 3-state outputs)

HD74HC670
• Waveform – 2
tr
tf
Data
D₁ to D₄
50%
G_W
Q₁ to Q₄
tPLH
50%
50%
tPHL
50%
V_CC
0V
VCC
0V
VOH
VOL
VCC
Data
50%
D₁ to D₄
0V
G_W
Q₁ to Q₄
tPHL
90%
50%
10%
tTHL
50%
tPLH
90%
50%
tTLH
VCC
0V
VOH
VOL
Note : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, t_r ≤ 6 ns, t_f ≤ 6 ns
• Waveform – 3
tf
tr
Read
90 %
50 %
90 %
V_CC
50 %
Enable
10 %
10 %
0V
t_ZL
t_LZ
Waveform - A
50 %
t_ZH
10 %
t_HZ
V_OH
V_OL
Waveform - B
50 %
90 %
V_OH
V_OL
Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, t_r ≤ 6 ns, t_f ≤ 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 Mar 30, 2006 page 7 of 8