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PDF 74F779 Data sheet ( Hoja de datos )
| Número de pieza | 74F779 | |
| Descripción | 8-Bit Bidirectional Binary Counter with 3-STATE Outputs | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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April 1988
Revised March 2000
74F779
8-Bit Bidirectional Binary Counter with 3-STATE Outputs
General Description
The 74F779 is a fully synchronous 8-stage up/down
counter with multiplexed 3-STATE I/O ports for bus-ori-
ented applications. All control functions (hold, count up,
count down, synchronous load) are controlled by two mode
pins (S0, S1). The device also features carry lookahead for
easy cascading. All state changes are initiated by the rising
edge of the clock.
Features
s Multiplexed 3-STATE I/O ports
s Built-in lookahead carry capability
s Count frequency 100 MHz typ
s Supply current 80 mA typ
s Available in SOIC (300 mil only)
Ordering Code:
Order Number Package Number
Package Description
74F779SC
M16B
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F779PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
© 2000 Fairchild Semiconductor Corporation DS009593
www.fairchildsemi.com
1 page  
AC Electrical Characteristics
Symbol
Parameter
fMAX
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Maximum Clock Frequency
Propagation Delay
CP to I/On
Propagation Delay
CP to TC
Propagation Delay
CET to TC
Propagation Delay
SN to TC
Output Enable Time
OE to I/On
Output Disable Time
OE to I/On
AC Operating Requirements
Symbol
tS(H)
tS(L)
tH(H)
tH(L)
tS(H)
tS(L)
tH(H)
tH(L)
tS(H)
tS(L)
tH(H)
tH(L)
tW(H)
tW(L)
Setup Time
I/On to CP
Hold Time
I/On to CP
Setup Time
Sn to CP
Hold Time
Sn to CP
Setup Time
CET to CP
Hold Time
CET to CP
Clock Pulse Width
HIGH or LOW
Parameter
TA = +25°C
VCC = +5.0V
CL = 50 pF
Min Typ Max
100 105
3.0 5.0 8.0
5.0 7.5 11.0
5.0 7.5 9.0
5.0 9.3 10.5
2.5 3.8 5.5
4.5 6.1 8.0
3.5 6.5 12.0
3.5 7.5 12.0
3.0 5.0 7.0
5.0 8.0 10.0
1.0 4.0 6.5
1.0 3.7 6.5
TA = 0°C to +70°C
VCC = +5.0V
CL = 50 pF
Min Max
90
3.0 8.5
5.0 11.0
5.0 10.0
5.0 11.5
2.5 6.0
4.5 8.5
3.5 13.0
3.5 13.0
3.0 8.0
5.0 10.5
1.0 7.0
1.0 7.0
Units
ns
ns
ns
ns
ns
ns
TA = +25°C
VCC = +5.0V
Min Max
5.0
5.0
0.0
0.0
9.5
9.5
0.0
0.0
7.0
7.0
0.0
0.0
4.0
4.0
TA = 0°C to +70°C
VCC = +5.0V
Min Max
5.0
5.0
0.0
0.0
10.0
10.0
0.0
0.0
7.0
7.0
0.0
0.0
4.0
4.0
Units
ns
ns
ns
ns
ns
ns
ns
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet 74F779.PDF ] | |
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