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参数资料
| 型号： | SN74AS879NT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 总线收发器 |
| 英文描述： | AS SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDIP24 |
| 封装： | 0.300 INCH, PLASTIC, DIP-24 |
| 文件页数： | 7/8页 |
| 文件大小： | 112K |
| 代理商： | SN74AS879NT |
SN54AS878, SN54AS879
SN74AS878, SN74AS879
DUAL 4BIT DTYPE EDGETRIGGERED FLIPFLOPS WITH 3STATE OUTPUTS
SDAS062A D2661, APRIL 1982 REVISED MAY 1986
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77001
7
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS878
SN74AS878
PARAMETER
TEST CONDITIONS
SN54AS879
SN74AS879
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
V
VCC = 4.5 V to 5.5 V,
IOH = 2 mA
VCC 2
VOH
VCC = 4.5 V,
IOH = 12 mA
2.4
3.2
V
VCC = 4.5 V,
IOH = 15 mA
2.4
3.3
VOL
VCC = 4.5 V,
IOL = 32 mA
0.29
0.5
V
VOL
VCC = 4.5 V,
IOL = 48 mA
0.33
0.5
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
50
A
IOZL
VCC = 5.5 V,
VO = 0.4 V
50
A
II
VCC = 5.5 V,
VI = 7 V
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
A
IIL
D
VCC = 5.5 V,
VI = 0.4 V
3
2
mA
IIL
All other
VCC = 5.5 V,
VI = 0.4 V
0.5
mA
IO
VCC = 5.5 V,
VO= 2.25 V
30
112
30
112
mA
Outputs high
82
132
82
132
’AS878
Outputs low
96
155
96
155
ICC
VCC = 5.5 V,
Outputs disabled
100
160
100
160
mA
ICC
See Note 2
Outputs high
88
142
88
142
mA
’AS879
Outputs low
94
150
94
150
Outputs disabled
100
160
100
160
All typical values are at VCC = 5 V, TA = 25°C.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
NOTE 2: ICC is measured with CLR and all D inputs grounded, and CLK and OC at 4.5 V.
switching characteristics (see Note 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
,
FROM
TO
R2 = 500
,
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
TA = MIN to MAX
UNIT
PARAMETER
(INPUT)
(OUTPUT)
SN54AS878
SN54AS879
SN74AS878
SN74AS879
UNIT
MIN
MAX
MIN
MAX
tmax
100
125
MHz
tPLH
CLK
Q or Q
3
11.5
3
8.5
ns
tPHL
CLK
Q or Q
4
12.5
4
10.5
ns
tPZH
OC
Q or Q
2
8
2
7
ns
tPZL
OC
Q or Q
3
11.5
3
10.5
ns
tPHZ
OC
Q or Q
2
7
2
6
ns
tPLZ
OC
Q or Q
2
7
2
6
ns
NOTE 1: Load circuit and voltage waveforms are shown in Section 1.
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