參數(shù)資料
型號: N74F269D,623
廠商: NXP Semiconductors
文件頁數(shù): 16/19頁
文件大?。?/td> 0K
描述: IC COUNTER 8BIT BINARY 24SOIC
產(chǎn)品培訓(xùn)模塊: Logic Packages
標(biāo)準(zhǔn)包裝: 1,000
系列: 74F
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): 8
計數(shù)速率: 115MHz
觸發(fā)器類型: 正邊沿
電源電壓: 4.5 V ~ 5.5 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SO
包裝: 帶卷 (TR)
其它名稱: 933784250623
N74F269D-T
N74F269D-T-ND
74F269
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 6 — 14 December 2011
6 of 19
NXP Semiconductors
74F269
8-bit bidirectional binary counter
6.
Functional description
6.1 Function table
[1]
H = HIGH voltage level steady state
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition
L = LOW voltage level steady state
l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition
qn = Lower case letters indicate state of referenced output prior to the LOW-to-HIGH clock transition
X = don’t care
= LOW-to-HIGH clock transition
* = The TC is LOW when CET is LOW and the counter is at terminal count
Terminal count up is with all Qn outputs HIGH and terminal count down is with all Qn outputs LOW.
Table 3.
Function table[1]
Operating modes
Input
Output
CP
U/D
CEP
CET
PE
Dn
Qn
TC
Parallel load (Dn to Qn)
XX
XI
I
L
*
XX
Xl
h
H
*
Count up (increment)
h
I
h
X
count up
*
Count down (decrement)
I
h
X
count down
*
Hold (do nothing)
Xh
I
h
Xqn
*
XX
h
Xqn
H
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