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74HCT670 датащи(PDF) 8 Page - NXP Semiconductors

номер детали 74HCT670
подробное описание детали  4 x 4 register file; 3-state
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT670 датащи(HTML) 8 Page - NXP Semiconductors

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December 1990
8
Philips Semiconductors
Product specification
4 x 4 register file; 3-state
74HC/HCT670
AC WAVEFORMS
Fig.6
Waveforms showing the read address input
(RA, RB) to output (Qn) propagation delays
and output transition times.
(1) HC : VM = 50%; VI = GND to VCC.
HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.7
Waveforms showing the write enable input
(WE) and data input (Dn) to output (Qn)
propagation delays, and the write enable
pulse width.
(1) HC : VM = 50%; VI = GND to VCC.
HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.8
Waveforms showing the write address input (WA, WB) and data input (Dn) to write enable (WE) set-up,
hold and latch times.
(1) HC : VM = 50%; VI = GND to VCC.
HCT : VM = 1.3 V; VI = GND to 3 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 (tlatch) is important
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 RA or RB, RE must be LOW.


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