參數(shù)資料
型號: 74HC191DB,118
廠商: NXP Semiconductors
文件頁數(shù): 10/14頁
文件大?。?/td> 0K
描述: IC 4BIT BINAR UP/DN COUNT 16SSOP
產(chǎn)品培訓模塊: Logic Packages
標準包裝: 2,000
系列: 74HC
邏輯類型: 二進制計數(shù)器
方向: 上,下
元件數(shù): 1
每個元件的位元數(shù): 4
計時: 同步
計數(shù)速率: 39MHz
觸發(fā)器類型: 正邊沿
電源電壓: 2 V ~ 6 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 16-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 16-SSOP
包裝: 帶卷 (TR)
其它名稱: 74HC191DB-T
74HC191DB-T-ND
935188600118
December 1990
5
Philips Semiconductors
Product specication
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
FUNCTION TABLE
TC AND RC FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
I
= LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
X = don’t care
↑ = LOW-to-HIGH CP transition
= one LOW level pulse
= TC goes LOW on a LOW-to-HIGH CP transition
OPERATING MODE
INPUTS
OUTPUTS
PL
U/D
CE
CP
Dn
Qn
parallel load
L
X
L
H
L
H
count up
H
L
I
X
count up
count down
H
I
X
count down
hold (do nothing)
HXHX
X
no change
INPUTS
TERMINAL COUNT STATE
OUTPUTS
U/D
CE
CP
Q0
Q1
Q2
Q3
TC
RC
H
L
H
L
H
L
X
H
L
H
L
H
L
H
L
H
L
H
Fig.4 Functional diagram.
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