參數(shù)資料
型號: 74HCT4520
廠商: NXP Semiconductors N.V.
元件分類: 通用總線功能
英文描述: 4-Bit Synchronous Up/Down Binary Counters 16-SOIC -40 to 85
中文描述: 雙4位同步二進制計數(shù)器
文件頁數(shù): 7/7頁
文件大小: 55K
代理商: 74HCT4520
December 1990
7
Philips Semiconductors
Product specification
Dual 4-bit synchronous binary counter
74HC/HCT4520
AC WAVEFORMS
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
Fig.7
Waveforms showing removal time for nMR; minimum nCP
0
, nCP
1
, nMR pulse widths and maximum clock
pulse frequency.
Conditions:
nCP
1
= HIGH while nCP
is triggered on a LOW-to-HIGH transition; t
W
and t
also apply when nCP
0
= LOW and nCP
1
is triggered on a
HIGH-to-LOW transition.
(1) HC : V
M
= 50%; V
I
= GND to V
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.8
Waveforms showing set-up times for nCP
0
to nCP
1
and nCP
1
to nCP
0
, propagation delays and output
transition times.
(1) HC : V
M
= 50%; V
I
= GND to V
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.9 Waveforms showing propagation delay from nMR to nQ
n
output.
(1) HC : V
M
= 50%; V
I
= GND to V
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
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