74hct670 NXP Semiconductors, 74hct670 Datasheet - Page 8

• Manufacturer Part Number: 74hct670
• Description: 4 X 4 Register File; 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
AC WAVEFORMS
December 1990
4 x 4 register file; 3-state
(1) HC : V
Fig.6
(1) HC : V
The shaded areas indicate when the input is permitted
to change for predictable output performance.
The time allowed for the internal output of the latch to
assume the state of the new data (t
only when attempting to read from a location
immediately after that location has received new data.
This parameter is measured from the falling edge of
WE to the rising edge of R
Fig.8
HCT : V
HCT : V
Waveforms showing the read address input
(R
and output transition times.
Waveforms showing the write address input (W
hold and latch times.
M
M
M
M
A
= 50%; V
= 1.3 V; V
= 50%; V
= 1.3 V; V
, R
B
) to output (Q
I
I
I
I
= GND to V
= GND to V
= GND to 3 V.
= GND to 3 V.
A
or R
B
, RE must be LOW.
latch
CC
CC
n
.
.
) is important
) propagation delays
A
8
, W
B
) and data input (D
(1) HC : V
Fig.7
HCT : V
Waveforms showing the write enable input
(WE) and data input (D
propagation delays, and the write enable
pulse width.
M
M
= 50%; V
= 1.3 V; V
I
n
I
= GND to V
) to write enable (WE) set-up,
= GND to 3 V.
CC
.
74HC/HCT670
n
) to output (Q
Product specification
n
)