- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376796 > DM74LS469 (Fairchild Semiconductor Corporation) 8-Bit Up/Down Counter PDF資料下載
參數(shù)資料
| 型號(hào)： | DM74LS469 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-Bit Up/Down Counter |
| 中文描述： | 8位加/減計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 143K |
| 代理商： | DM74LS469 |
DM74LS469
8-Bit Up/Down Counter
General Description
The ’LS469 is an 8-bit synchronous up/down counter with
parallel load and hold capability. Three function-select inputs
(LD, UD, CBI) provide one of four operations which occur
synchronously on the rising edge of the clock (CK).
The LOAD operation loads the inputs (D
–D
) into the output
register (Q
–Q
). The HOLD operation holds the previous
value regardless of clock transitions. The INCREMENT op-
eration adds one to the output register when the carry-in in-
put is TRUE (CBI =LOW), otherwise the operation is a
HOLD. The carry-out (CBO) is TRUE (CBO =LOW) when
the output register (Q
–Q
) is all HIGHs, otherwise FALSE
(CBO =HIGH). The DECREMENT operation subtracts one
from the output register when the borrow-in input is TRUE
(CBI =LOW), otherwise the operation is a HOLD. The
borrow-out (CBO) is TRUE (CBO =LOW) when the output
register (Q
7
–Q
0
) is all LOWs, otherwise FALSE (CBO
=HIGH).
The output register (Q
–Q
) is enabled when OE is LOW,
and disabled (HI-Z) when OE is HIGH. The output drivers will
sink the 24 mA required for many bus-interface standards.
Two or more ’LS469 octal up/down counters may be cas-
caded to provide larger counters.
Features/Benefits
n
8-bit up/down counter for microprogram-counter, DMA
controller and general-purpose counting applications
n
8 bits matches byte boundaries
n
Bus-structured pinout
n
24-pin SKINNYDIP saves space
n
3-STATE outputs drive bus lines
n
Low current PNP inputs reduce loading
n
Expandable in 8-bit increments
Connection Diagram
Standard Test Load
Top View
DS008333-1
Order Number DM54LS469J,
DM74LS469J or DM74LS469N
See Package Number J24F or N24C
DS008333-3
April 1998
D
1998 Fairchild Semiconductor Corporation
DS008333
www.fairchildsemi.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM74LS47 | 8-Input Multiplexer |
| DM74LS47M | 8-Input Multiplexer; Package: SOIC; No of Pins: 16; Container: Tape & Reel |
| DM74LS47N | 8-Input Multiplexer; Package: SOP; No of Pins: 16; Container: Rail |
| DM74LS47MX | Decoder/Driver |
| DM74LS533N | Octal Transparent Latch with 3-STATE Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74LS47M | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 BCD to 7-Seg Dec/Drv RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74LS47MX | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 BCD to 7-Seg Dec/Drv RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74LS47N | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 BCD to 7-Seg Dec/Drv RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74LS503N | 功能描述:寄存器 8-Bit Succ App Reg RoHS:否 制造商:NXP Semiconductors 邏輯類型:CMOS 邏輯系列:HC 電路數(shù)量:1 最大時(shí)鐘頻率:36 MHz 傳播延遲時(shí)間: 高電平輸出電流:- 7.8 mA 低電平輸出電流:7.8 mA 電源電壓-最大:6 V 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-38 封裝:Tube |
| DM74LS51 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。