參數資料
型號： 74F579PCQR
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 通用總線功能
英文描述： 8-Bit Bidirectional Binary Counter with TRI-STATE Outputs
中文描述： F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 8-BIT BIDIRECTIONAL BINARY COUNTER, PDIP20
封裝： DIP-20
文件頁數： 2/14頁
文件大?。?/td> 112K
代理商： 74F579PCQR
Philips Semiconductors
Product specification
74F579
8-bit bidirectional binary counter (3-State)
2
1992 May 04
853-0377 06639
FEATURES
Fully synchronous operation
Multiplexed 3-State I/O ports for bus oriented applications
Built in cascading carry capability
U/D pin to control direction of counting
Separate pins for Master reset and Synchronous operation
Center power pins to reduce effects of package inductance
Count frequency 115MHz Typ
Supply current 100mA Typ
See 74F269 for 24-pin separate I/O port version
See 74F779 for 16-pin version
DESCRIPTION
The 74F579 is a fully synchronous 8-stage Up/Down Counter with
multiplexed 3-State I/O ports for bus-oriented applications. It
features a preset capability for programmable operation, carry
look-ahead for easy cascading and a U/D input to control the
direction of counting. All state changes, except for the case of
asynchronous reset, are initiated by the rising edge of the clock.
TC output is not recommended for use as a clock or asynchronous
reset due to the possibility of decoding spikes.
PIN CONFIGURATION
20
19
18
17
16
15
14
13
12
10
11
9
8
7
6
5
4
3
2
1
CP
I/O0
I/O1
I/O2
I/O3
GND
I/O4
I/O5
I/O6
I/O7
VCC
MR
SR
CEP
CET
TC
PE
CS
OE
U/D
SF01085
ORDERING INFORMATION
TYPE
TYPICAL f
MAX
TYPICAL SUPPLY
CURRENT
(TOTAL)
74F579
115MHz
100mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
PKG DWG #
20-Pin Plastic DIP
N74F579N
SOT146-1
20-Pin Plastic SOL
N74F579D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
I/O
n
Data Inputs
3.5/1.0
70
μ
A/0.6mA
Data Outputs
150/40
3.0mA/24mA
PE
Parallel Enable input (active Low)
1.0/1.0
20
μ
A/0.6mA
U/D
Up/Down count control input
1.0/1.0
20
μ
A/0.6mA
MR
Master Reset input (active Low)
1.0/1.0
20
μ
A/0.6mA
SR
Synchronous Reset input (active Low)
1.0/1.0
20
μ
A/0.6mA
CEP
Count Enable Parallel input (active Low)
1.0/1.0
20
μ
A/0.6mA
CET
Count Enable Trickle input (active Low)
1.0/1.0
20
μ
A/0.6mA
CS
Chip Select input (active Low)
1.0/1.0
20
μ
A/0.6mA
OE
Output Enable input (active Low)
1.0/1.0
20
μ
A/0.6mA
CP
Clock input (active Rising Edge)
1.0/1.0
20
μ
A/0.6mA
TC
Terminal Count Output (active Low)
50/33
1.0mA/20mA
NOTE:
One (1.0) FAST Unit Load (U.L.) is defined as: 20
μ
A in the High state and 0.6mA in the Low state.
相關PDF資料
PDF描述
74F579 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F579SC 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F579SJ 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F579PC 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F582SDC Fixed Point ALU
相關代理商/技術參數
參數描述
74F579SC 功能描述:計數器移位寄存器 8-Bit Bidir Bin Ctr RoHS:否 制造商:Texas Instruments 計數器類型: 計數順序:Serial to Serial/Parallel 電路數量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel
74F579SCX 功能描述:計數器移位寄存器 8-Bit Bidir Bin Ctr RoHS:否 制造商:Texas Instruments 計數器類型: 計數順序:Serial to Serial/Parallel 電路數量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel
74F579SCX 制造商:Fairchild Semiconductor Corporation 功能描述:IC COUNTERS/MULTIPLIERS/DIVIDERS LOGIC
74F579SJ 功能描述:計數器移位寄存器 8-Bit Bidir Bin Ctr RoHS:否 制造商:Texas Instruments 計數器類型: 計數順序:Serial to Serial/Parallel 電路數量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel
74F579SJX 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Synchronous Up/Down Counter
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