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參數資料
| 型號： | 74F579SJX |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous Up/Down Counter |
| 中文描述： | 同步加/減計數器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 81K |
| 代理商： | 74F579SJX |
2000 Fairchild Semiconductor Corporation
DS009568
www.fairchildsemi.com
April 1988
Revised October 2000
7
74F579
8-Bit Bidirectional Binary Counter with 3-STATE Outputs
General Description
The 74F579 is a fully synchronous 8-stage up/down
counter with multiplexed 3-STATE I/O ports for bus-ori-
ented applications. It features a preset capability for pro-
grammable operation, carry lookahead for easy cascading
and a U/D input to control the direction of counting. All state
changes, whether in counting or parallel loading, are initi-
ated by the rising edge of the clock.
Features
I
Multiplexed 3-STATE I/O ports
I
Built-in lookahead carry capability
I
Count frequency 100 MHz typical
I
Supply current 75 mA typical
I
Guaranteed 4000V minimum ESD protection
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” tot he ordering code.
Logic Symbol
Connection Diagram
Order Number
74F579SC
74F579SJ
74F579PC
Package Number
M20B
M20D
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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