參數(shù)資料
型號(hào): 74HCT297
廠商: NXP Semiconductors N.V.
英文描述: Digital phase-locked-loop filter
中文描述: 數(shù)字鎖相環(huán)回路濾波器
文件頁數(shù): 12/12頁
文件大小: 101K
代理商: 74HCT297
September 1993
12
Philips Semiconductors
Product specification
Digital phase-locked-loop filter
74HC/HCT297
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
Fig.13 Waveforms showing the phase input (
φ
B,
φ
A
2
) to output (ECPD
OUT
) 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.14 Waveforms showing the clock (K
CP
) pulse width and the maximum clock pulse frequency, and the input
(D/U, EN
CTR
) to clock (K
CP
) set-up and hold times.
The shaded areas indicate when the input is
permitted to change for predictable output
performance.
(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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